JPH06334487A - Synthesizer receiver - Google Patents

Abstract

(57) [Abstract] [Purpose] In a synthesizer receiver, improve the operability during direct tuning. [Structure] In the synthesizer receiver, the numerical KNUM keys from "0" to "9" and the direct tuning key KD
Provide T and. When the direct tuning key KDT is operated in the normal operation mode, the direct tuning mode is set. In this direct channel selection mode, the numeric keys KNU are used in accordance with the numbers indicating the target reception frequency f12.
When M is operated, the frequency division ratio N corresponding to the target reception frequency f12 is set in the variable frequency dividing circuit 22 of the PLL 20, and the target reception frequency f12 is selected. In the direct channel selection mode, the target reception frequency f12
When operating the direct tuning key KDT while operating the number keys KNUM according to the number
Return to the initial state of direct tuning mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthesizer receiver having improved operability when selecting a channel.

[0002]

2. Description of the Related Art In a synthesizer type receiver, 1. When, for example, the "1" key of the numeric keys from "0" to "9" is pressed, the frequency preset in the "1" key becomes One-touch channel selection. 2. Press the key called "Direct tuning key" and then press the "8", "7", "5", and "0" keys in order to select the frequency 87.50 MHz. There is something like this.

In the following description, the method of directly specifying the reception frequency and selecting a channel and the operation mode thereof as described in Section 2. are referred to as "direct channel selection" and "direct channel selection mode". I will decide.

[0004]

However, when the numeric key is pressed by mistake when performing direct channel selection, it is naturally necessary to re-input the reception frequency.

Therefore, in order to enable the re-input of the reception frequency, a direct tuning release key is provided, and when re-entering the reception frequency, the release key is pressed to release the direct tuning mode, and then the direct selection is again performed. A receiver has been considered in which a station key is pressed to enter a direct channel selection mode and then a correct reception frequency is input. Also,
A receiver is also considered in which, when the input frequency is determined to be outside the reception band, the input is forcibly restarted from the first digit of the reception frequency.

However, in the former receiver, since the direct tuning mode is once released and the direct tuning key is pressed again, the key operation is troublesome. Moreover, in addition to the direct channel selection key, a release key is required, which complicates the operation panel surface or makes the key confusing, which also deteriorates the operability and is disadvantageous in terms of design.

Further, in the latter receiver, when the direct tuning key is pressed, it waits until the direct tuning mode is released after a certain period of time elapses, or a key unrelated to tuning is pressed to directly It is necessary to cancel the tuning mode, and the operability is not good.

The present invention is intended to solve such a problem.

[0009]

Therefore, in the present invention, when the reference numerals of the respective parts correspond to the embodiments described later, the frequency dividing ratio N of the variable frequency dividing circuit 22 included in the PLL 20 will be described.
In the synthesizer receiver in which the reception frequency f12 can be changed by changing, the numerical KNUM key from "0" to "9" and the direct tuning key KD
In the normal operation mode, when the direct tuning key KDT is operated, the direct tuning mode is set. In this direct tuning mode, the numeric key KNUM is used in accordance with the numeral indicating the target reception frequency f12.
When is operated, the frequency division ratio N corresponding to the target reception frequency f12 is set in the variable frequency dividing circuit 22 to select the target reception frequency f12. In the direct channel selection mode, the target reception frequency f12 is selected. When the direct tuning key KDT is operated while the numeric keys KNUM are being operated in accordance with the numbers indicating the frequency f12, the initial state of the direct tuning mode is restored.

[0010]

[Function] When the direct tuning key KDT is pressed, the direct tuning mode is entered. In this direct channel selection mode, when the numeric key KNUM is pressed in accordance with the target reception frequency f12, the reception frequency f12 is selected. However, while pressing the numeric key KNUM, the direct tuning key KD
When T is pressed, the initial state of direct channel selection is restored, and the reception frequency f12 can be input again or the direct channel selection mode can be released.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 10 designates a receiving circuit, in which a received signal from an antenna 11 is supplied to an antenna tuning circuit 12 of an electronic tuning system so that an F of a target receiving frequency f12 is obtained.
The M broadcast wave signal S12 is taken out.

This signal S12 is the high frequency amplifier 1
3 to the mixer circuit 14 and VC
The frequency f21 from O21 is, for example, f21 = f12−f14 [MHz] (1) f14 is an intermediate frequency, and an oscillation signal S21 of f14 = 10.7 MHz is taken out, and this signal S21 is output to the mixer circuit 14. The signal S12 is supplied as a local oscillation signal, and the frequency of the signal S12 is converted into an intermediate frequency signal S14 (intermediate frequency f14).

The intermediate frequency signal S14 is supplied to the FM demodulation circuit 16 through the intermediate frequency amplifier 15 having, for example, a ceramic filter and an amplifier to demodulate an audio signal (monaural signal or stereo composite signal), and this signal is output to the terminal. It is taken out to 17.
Further, for example, the demodulation circuit 16 supplies the intermediate frequency signal S14 to the detection circuit 18 to extract a signal S18 indicating whether or not the broadcast wave signal S12 is received.

At this time, the VCO 21 has the circuit 2
The PLL 20 is configured with 2 to 25. That is, the signal S21 from the VCO 21 is supplied to the variable frequency dividing circuit 22 and divided into a frequency of 1 / N, and this frequency divided signal is supplied to the phase comparison circuit 23 and the oscillation circuit 24.
An oscillating signal having a reference frequency, for example, a frequency of 50 kHz is taken out from the rectifying circuit. Further, the output voltage of the filter 25 is supplied to the tuning circuit 12 as a tuning voltage.

Therefore, in the steady state, the frequency-divided signal from the frequency-dividing circuit 22 and the oscillating signal of the oscillating circuit 24 have the same frequency. Therefore, the frequency f21 of the oscillating signal S21 at this time is f21 = N × 50. [KHz] = N x 0.05 [MHz] (2), and from equations (1) and (2), f12 = f21 + f14 = N x 0.05 + f14 = N x 0.05 + 10.7 [MHz] ... (3 ).

Therefore, if the frequency division ratio N is changed by "1" between 1306 and 1946, the local oscillation frequency f21
However, since it changes from 65.3 MHz to 97.3 MHz at intervals of 50 kHz, the reception frequency f12 changes in the frequency band of 76.0 MHz to 108.0 MHz in frequency steps of 50 kHz according to the division ratio N. Become.

Further, 30 is a microcomputer for system control, 31 is its CPU, 32
Is a ROM in which various processing routines are written, 33
Is a work area RAM, 34 is a memory for storing various data, and these memories 32 to 34 are connected to the CPU 31 through a system bus 39.

In this case, the ROM 32 stores, for example, in FIGS.
The tuning routine 100 and the like shown in FIG. 6 are written. Further, the memory 34 is a ROM capable of electrically erasing and writing data, or
Although not shown, a RAM backed up by a battery
That is, the memory 34 is a non-volatile memory so that the written data can be held even when the power is turned off.

Reference numeral 41 is an output port, 42 is an input port, and 43 is a key interface circuit.
1 to 43 are connected to the CPU 31 through the bus 39. Then, the port 41 is connected to the frequency dividing circuit 22, and a program to be described later is executed so that the frequency dividing circuit 22 receives the frequency dividing ratio N.
Is set. Further, a signal S18 indicating the presence or absence of the broadcast wave signal S12 from the detection circuit 18 is supplied to the port 42. Further, as the operation keys, numeric keys KNUM of "0" to "9", a direct tuning key KDT, an up key KUP, a down key KDWN, a preset key KPS and the like are connected to the interface circuit 43. In addition, key KNUM ~
Each KPS is composed of a non-lock type push switch.

Further, reference numeral 45 is a display controller, and 46 is an LCD for display, and by supplying predetermined data from the CPU 31 to the controller 45, LC
The reception frequency f12 and the like are digitally displayed on D46.

According to such a configuration, the CPU 31 causes the R
By executing the routine 100 of the OM 32, the following operation and processing are performed.

<< Direct Channel Selection >> Direct channel selection is executed by pressing the direct channel selection key KDT as described above. However, since there are various cases of this direct channel selection, in each of the following cases, I will explain separately.

When the correct reception frequency f12 is input In this case, the display is changed in response to the key input as shown in FIG. 7, for example, and the channel selection is performed. That is, assuming that the frequency 87.50 MHz is currently selected, for example, in FIG.
As shown in A, the LCD 46 displays the reception frequency f12
"87.50 MHz" that indicates is displayed digitally.

When in such a state, as shown in FIG.
As shown in B, press the direct tuning key KDT. Then, as shown in FIG. 7B, in the most significant digit of LCD 46,
“0” is displayed blinking (flushing), and the user is notified that the direct channel selection mode has been entered.

The target reception frequency f12 is 103.
Assuming that the frequency is 50 MHz, then as shown in FIG. 7C, "1", "0", "3", "5" according to the number of the target reception frequency f12 among the number keys KNUM. ,
Press each key "0" in order. Then, as shown in FIG. 7C, every time the numeric key KNUM is pressed, the numbers of the pressed numeric key KNUM are displayed in order.

When the last "0" key KNUM is pressed, the frequency 103.50 MHz is selected as shown in FIG. 7D, and thereafter, "10" indicating the reception frequency f12 is selected.
3.50 MHz ”is digitally displayed on the LCD 46.

Thus, when the correct reception frequency f12 is input, the frequency f12 is digitally displayed and the frequency f12 is selected.

The above channel selection and display processing is performed as follows. That is, when the direct tuning key KDT is pressed in the receiving state of the arbitrary frequency f12, C
The processing of the PU 31 starts from step 101 of the routine 100, and then at step 102, the mode flag indicating the operation mode is set to the direct channel selection mode. Subsequently, in step 103, as shown in FIG. 7B, “0” is blinkingly displayed on the most significant digit of the LCD 46, and then, in step 104, the digit counter DGTC for displaying the reception frequency f12 is DGTC = 1. (Most significant digit)
, And then the process waits for key input in step 111.

Although not shown, this step 11
When there is no key input even if a predetermined time, for example, 8 seconds has elapsed after waiting for the key input at 1, the direct channel selection mode is canceled.

When waiting for key input in step 111, if the "1" key corresponding to the first digit "1" of the target reception frequency f12 is pressed among the numeric keys KNUM, the processing is executed. The process proceeds from step 111 to step 112. In this step 112, it is checked whether or not DGTC = 1. In this case, since DGTC = 1 is set in step 104, the process proceeds from step 112 to step 121. . And this step 121
In step 111, it is checked whether the key input in step 111 is the direct tuning key KDT. In this case, it is not the direct tuning key KDT, so the process is step 1
From 21 to step 122.

Then, in this step 122, it is checked whether or not the key input in step 111 is the numeric key KNUM. In this case, it is the numeric key KNUM.
The process proceeds from step 122 to step 123. In this case, if the target reception frequency f12 is 100 MHz or more, the key input of the reception frequency f12 has 5 digits, but if it is less than 100 MHz, it has 4 digits, so in step 123, the key of step 111 is pressed. Input is "1"
Whether the key is a key or not is checked, and if the key is a "1" key, the process is unchanged from step 123 to step 12
5, the process proceeds from step 123 to step 124 when it is not the “1” key, and this step 12
4, the DGTC = 2 is set, and then the routine proceeds to step 125.

Then, in step 125, the numeric data of the numeric key KNUM input in step 111 is written in the work area of the RAM 33 as the DGTC digit data of the target reception frequency f12. When DGTC = 2, the first digit data is "0".

Subsequently, in step 126, as shown in the uppermost line of FIG. 7C, for example, the numeral "1" input in step 111 is displayed at the digit position of the DGTC digit of the LCD 46. Then, in step 127, the digit counter DGTC is incremented by "1", and then in step 191, it is checked whether or not the mode flag is set to the direct channel selection mode. In this case, the mode flag remains set to the direct channel selection mode in step 102,
The process returns from step 191 to step 111 and waits for key input again.

Then, when the "0" key corresponding to the second digit "0" of the intended reception frequency f12 is pressed among the numeric keys KNUM, the process proceeds from step 111 to step 112, In this step 112, DGTC =
It is checked whether or not it is 1, and in this case, since DGTC = 2 (or 3) is set in step 127, the process proceeds from step 112 to step 113,
In this step 113, it is checked whether or not DGTC ≦ 5. In this case, since DGTC = 2, the process proceeds from step 113 to step 221.

Then, in this step 221, it is checked whether or not the key input in step 111 is the direct channel selection key KDT. In this case, since it is not the direct channel selection key KDT, the process proceeds from step 221 to step 222. In step 222, it is checked whether the key input in step 111 is the numeric key KNUM. In this case, since it is the numeric key KNUM, the process proceeds from step 222 to step 225.

Then, in this step 225, the numeric data of the numeric key KNUM input in step 111 is written in the work area of the RAM 33 as the DGTC digit data of the target reception frequency f12, and subsequently, In step 226, the number “0” input in step 111 is displayed at the digit position of the DGTC digit of the LCD 46, for example, as shown in the second line of FIG. 7C, and then,
In step 227, the digit counter DGTC is incremented by "1".

Next, at step 228, whether the reception frequency f12 is confirmed, that is, if the reception frequency f12 is 100 MHz or more, a five-digit number is input, and if it is less than 100 MHz, four digits are input. Is checked from the value of the digit counter DGTC, and when the reception frequency f12 is not fixed (when DGTC ≦ 5), the process proceeds from step 228 to step 191, and in this step 191, ,
It is checked whether the mode flag is set to the direct tuning mode. Then, in this case, the mode flag remains set to the direct channel selection mode in step 102, and therefore the process is step 191.
Then, the process returns to step 111 and waits for key input again.

Then, after that, steps 111 to 113,
221 to 228 and 191 are repeated, and the numbers “3”, “5”, and the third digit after the third digit of the target reception frequency f12,
When "0" is input in order from the numeric key KNUM, the number indicated by the input numeric key KNUM is sequentially written in the work area of the RAM 33 as the numerical data of the DGTC digit of the target reception frequency f12. For example, as shown in FIG. 7C, the numbers input in step 111 are sequentially displayed at the digit position of the DGTC digit of the LCD 46.

When all the numbers of the target reception frequency f12 are input and the reception frequency f12 is confirmed, the process proceeds from step 228 to step 229, and in this step 229, the input reception frequency f12 is changed to the reception band. Is checked, and in this case,
Since it is in the reception band, the process proceeds from step 229 to step 231. Then, in this step 231, the data of the reception frequency f12 written in the RAM 33 in steps 125 and 225 is converted into the corresponding frequency division ratio N and then set in the frequency division circuit 22 through the port 41. The frequency f12 to be selected is selected.

Next, the process proceeds to step 232, and in this step 232, for example, a waiting time of 1 second is performed. As will be apparent from the later description, when the target frequency f12 is selected, the numerical key KNUM works as a preset key of the preset frequency f12. If the numeric key KNUM is mistakenly pressed after f12 is selected, the frequency f12 preset to the numeric key KNUM that was mistakenly pressed is f12.
This is a process for preventing the selection of.

Subsequently, the process proceeds to step 281, in which the mode flag is changed from the direct channel selection mode to the normal mode to cancel the direct channel selection mode, and then the process proceeds to step 191.
Then, in this case, since the mode flag is the normal mode, the process proceeds from step 191 to step 192, and in this step 192, this routine 10 is executed.
The process of 0 is completed.

Therefore, when the direct tuning key KDT is pressed and then the numeric key indicating the reception frequency f12 of the numeric keys KNUM is correctly pressed, a display as shown in FIG. The frequency f12 to be selected is selected.

When canceling direct tuning (immediately after canceling) This is, for example, when the direct tuning key KDT is pressed,
This is a case where the direct channel selection is canceled before the numerical key KNUM is subsequently pressed.

In this case, the display is changed in response to the key input as shown in FIG. 8, and the direct channel selection is canceled. That is, when the direct tuning key KDT is pressed when an arbitrary frequency f12 is selected, the display of the LCD 46 changes and "0" blinks as shown in FIGS. 8A and 8B, as in the case of. , It is displayed that the direct tuning mode has been entered.

When the direct channel selection key KDT is pressed again as shown in FIG. 8C in this state, as shown in FIG.
As shown in C, the original reception frequency f12 is displayed, the reception frequency f12 is not changed, and the tuning state of the original reception frequency f12 is continued.

Thus, even if the direct tuning key KDT is pressed, if the direct tuning key KDT is pressed again while "0" is flashing, the direct tuning mode is canceled.

The above processing is performed as follows. That is, when the direct tuning key KDT is pressed in the reception state of the arbitrary frequency f12, the processing of the CPU 31 is the same as in the case of step 1 of the routine 100.
Starting from 01, the process proceeds to step 111, the mode flag is set to the direct channel selection mode, and the LCD 4
"0" is displayed blinking on the most significant digit of 6, and DGTC
= 1 and the key input is awaited in step 111.

In the present case, the direct tuning key K
When DT is pressed, the process proceeds from step 111 to step 112.
Proceed to, and in this case, DGTC = 1, so the process is step 1
The procedure proceeds from 12 to step 121. In this case, the key input in step 111 is the direct channel selection key KDT, so the process proceeds from step 121 to step 181.
In this step 181, the mode flag is set to the direct tuning mode normal mode and the direct tuning mode is canceled.

After that, the process proceeds to step 191, and in this case, since the mode flag is set to the normal mode, the process proceeds from step 191 to step 192, and in this step 192, this routine 100 is executed.
Ends the process.

Therefore, as shown in FIG. 8, if the direct channel selection key KDT is pressed, but if the direct channel selection key KDT is pressed again before the numeric key KNUM is subsequently pressed, the direct channel selection mode is released. .

When correcting the reception frequency f12 during input: In this case, the direct tuning key KDT was pressed, and then the numeric key KNUM was pressed to input the reception frequency f12.
This is the case when an error is noticed during the input and the input is redone.

In this case, in response to the key input, the display changes and the input can be redone as shown in FIG. 9, for example. That is, when the direct tuning key KDT is pressed when an arbitrary frequency f12 is selected, the display on the LCD 46 changes and "0" blinks as shown in FIGS. 9A and 9B, as in the case. , It is displayed that the direct tuning mode has been entered. Then, in this state, if the number key KNUM is pushed as shown in FIG. 9C, the number of the inputted number key is displayed on the LCD 46 as shown in FIG. 9C (up to this point) , Same as for).

However, if an error is noticed during the input, as shown in FIG. 9D, the direct tuning key K
Press DT. Then, as shown in FIG. 9D, “0” is displayed in a blinking manner on the most significant digit of the LCD 46, and the state (the initial state of FIG. 9B) when the direct tuning key KDT is first pressed is returned to.

Then, thereafter, as shown in FIG. 9E, when the number key KNUM is properly pressed, the inputted numbers of the number keys are sequentially displayed as shown in FIG. 9E, as in the case of. If you enter correctly until the end, Fig. 9F
As shown in, the reception frequency f12 is displayed and the frequency f12 is selected.

Thus, even if the input of the reception frequency f12 is incorrect, if the direct tuning key KDT is pressed, the reception frequency f12
You can start typing from the beginning.

The above processing is performed as follows. That is, when the direct tuning key KDT is pressed in the reception state of the arbitrary frequency f12, the processing of the CPU 31 is the same as in the case of step 1 of the routine 100.
Starting from 01, the process proceeds to step 111, the mode flag is set to the direct channel selection mode, and the LCD 4
"0" is displayed blinking on the most significant digit of 6, and DGTC
= 1 and the key input is awaited in step 111.

Then, when a numeral indicating the reception frequency f12 is inputted by the numeral keys KNUM, the inputted numeral data is written in the RAM 33 and displayed on the LCD 46 as in the case.

However, when waiting for the input of the next number while inputting the number indicating the reception frequency f12, that is,
When the direct channel selection key KDT is pressed when waiting for key input in step 111, the process proceeds to step 111.
Through steps 112 and 113 through step 221
In this case, the key input in step 111 is the direct channel selection key KDT, so the process proceeds from step 221 to step 271.

Then, in step 271, as in steps 103 and 104, as shown in FIG. 9D, L
"0" is blinking on the most significant digit of CD46 and DG
TC = 1 is set, and then the process returns to step 111 through step 191. Therefore, in this state, the process starts from step 101 and proceeds to step 1
Since it is the same as the case of proceeding to 11, it is possible to input the correct reception frequency f12 as in the case of later.

Thus, even if the input of the reception frequency f12 is incorrect, if the direct tuning key KDT is pressed, the reception frequency f12
You can start typing from the beginning.

When canceling the direct tuning mode while inputting the reception frequency f12: In this case, the direct tuning key KDT was pressed, and then the numeric key KNUM was pressed to input the reception frequency f12.
This is a case where the direct tuning is canceled during the input.
Then, such cancellation can be performed by pressing the direct tuning key KDT twice.

That is, in this case, as in the case of, when the key input waiting is made in step 111 while the number indicating the reception frequency f12 is being input, when the direct channel selection key KDT is pressed, in step 271, Figure 9
As shown in D, "0" is blinked in the most significant digit of the LCD 46 and DGTC = 1 is set, and then the process returns to the step 111 through the step 191.

Therefore, since the processing is returned to the initial state, when the direct tuning key KDT is pressed again, the processing in the case of is executed thereafter, and the direct tuning mode is canceled.

Thus, even if the input of the reception frequency f12 is incorrect, the direct tuning mode can be canceled by pressing the direct tuning key KDT.

-1 When an erroneous reception frequency f12 is input (No. 1) Since a frequency outside the reception band has been input, this is released by the direct tuning key KDT and the reception frequency f12 is input.
Is the case of re-entering. In this case, in response to the key input, the display of the LCD 46 changes as shown in FIGS. 10A to 10C, and if the last number of the reception frequency f12 is input, the reception frequency is displayed as shown in the bottom line of FIG. 10C. All digits of the number indicating f12 blink to indicate that the input frequency f12 is out of the receiving band. Then, when the direct tuning key KDT is pressed, as shown in FIG. 10D, L
"0" is displayed blinking on the most significant digit of the CD 46, and the input of the reception frequency f12 is awaited again.

Then, this processing is performed as follows. That is, when the direct tuning key KDT is pressed in the reception state of the arbitrary frequency f12, the processing of the CPU 31 is the same as in the case of step 1 of the routine 100.
Starting from 01, the process proceeds to step 111, the mode flag is set to the direct channel selection mode, and the LCD 4
"0" is displayed blinking on the most significant digit of 6, and DGTC
= 1 and the key input is awaited in step 111.

Then, thereafter, when a numeral indicating the reception frequency f12 is inputted with the numeral keys KNUM, the inputted numeral is the LCD as shown in FIG. 10C, as in the case of.
The data is displayed in order on 46, and the data is RA.
It is written in M33.

When all the numbers indicating the reception frequency f12 are input (at this time, DGTC = 6), it is detected in step 228 that the reception frequency f12 has been determined, and the process proceeds from step 228 to step 229.
Proceed to. However, in this case, since the input frequency f12 is out of the reception band, the processing is from step 229 to step 2
41. In step 241, all digits of the reception frequency f12 displayed on the LCD 46 are displayed in blinking as shown in the bottom line of FIG. 10C.
Then, after that, the process returns to step 111 through step 191 and waits for key input.

Therefore, as shown in FIG. 10D, when the direct channel selection key KDT is pressed, in this case, since all the numbers of the reception frequency f12 have been input and DGTC = 6, the process proceeds from step 111 to step 112. Through step 113, and further from step 113 to step 321. Then, in this step 321,
It is checked whether or not the key input in step 111 is the direct channel selection key KDT. In this case, since it is the direct channel selection key KDT, the process proceeds from step 321 to step 371, and in this step 371, similarly to step 271, As shown in FIG. 10D, “0” is blinked in the most significant digit of LCD 46 and DGTC = 1 is set, and then the process returns to step 111 through step 191. Therefore, in this state, the process is the same as when the process starts from step 101 and proceeds to step 111, so that the correct reception frequency f12 can be input as in the case of.

Thus, even if the frequency f12 outside the reception band is input, by pressing the direct tuning key KDT, the input of the reception frequency f12 can be restarted from the beginning.

-2 When the wrong reception frequency f12 is input (No. 2): When the frequency f12 outside the reception band is input, all the numbers indicating the reception frequency f12 are shown, for example, as shown in the bottom line of FIG. 10C. In this case, the direct tuning is performed by pressing the direct tuning key KDT and inputting the correct receiving frequency f12 without pressing the direct tuning key KDT.

Then, this processing is performed as follows. That is, when the frequency f12 outside the reception band is input, as described in -1, step 24
1, as shown in the bottom row of FIG.
All digits of the reception frequency f12 displayed in 6 are displayed in a blinking manner, and then the process returns to step 111 through step 191 to wait for key input.

Then, of the numeric keys KNUM, the numeric key corresponding to the first digit of the correct reception frequency f12 is pressed. Then, in this case, after five digits of the reception frequency f12 have been input and DGTC = 6, the process proceeds from step 111 to step 112 to step 113, and further proceeds from step 113 to step 321. Then, in this step 321, it is checked whether or not the key input in step 111 is the direct channel selection key KDT. In this case, since it is not the direct channel selection key KDT, the process proceeds from step 321 to step 322. In step 322, it is checked whether the key input in step 111 is the numeric key KNUM. In this case, since it is the numeric key KNUM, the process proceeds from step 322 to step 323.

Thereafter, in steps 323 to 327, the same processing as in steps 123 to 127 is performed, and DGTC = 1 or DGTC = 2 is set according to the numeric key KNUM input in step 111, and the LCD 46
The digit entered in step 111 is displayed at the digit position of the DGTC digit of the column, and the digit counter DGTC is incremented by "1". Then, the process returns from step 327 to step 111 through step 191, and again the key is pressed. Wait for input.

Therefore, thereafter, the correct reception frequency f12
By sequentially inputting the numbers of, the frequency f12 is selected as in the case of.

Thus, even if the frequency f12 outside the reception band is input, if the correct reception frequency f12 is continuously input,
The reception frequency f12 can be selected.

In the case of scanning from an arbitrary reception frequency f12 This is a combination of direct channel selection and scan reception. The reception frequency f12 is set by the numeric key KNUM, and then the up key KUP or the down key KDWN.
When is pressed, the scan is executed from the set reception frequency f12.

Here, a case where scanning is performed from the reception frequency f1290 MHz will be described as an example. That is, FIG.
As shown in FIG. 1A, when the direct tuning key KDT is pressed as shown in FIG. 11A in the reception state of an arbitrary reception frequency f12, the processing of the CPU 31 is similar to the case of
The routine 100 starts from step 101 and proceeds to step 111, the mode flag is set to the direct channel selection mode, and as shown in FIG.
"0" is displayed blinking on the most significant digit of and DGTC =
It is set to 1, and the key input is awaited in step 111.

Then, as shown in FIG. 11C, when the "9" and "0" keys of the numeric keys KNUM are pressed in sequence,
11C, the numbers of the pressed number keys are sequentially displayed on the LCD 46 and the data of the numbers are written in the work area of the RAM 33, as shown in FIG. 11C.

After entering "90" and waiting for key input in step 111, for example, when the up key KUP is pressed as shown in FIG. 11D, the process proceeds from step 111 to steps 112, 113 and 221.
Through to step 222. Then, in this case, the key input in step 111 is the up key KUP, so the process proceeds from step 222 to step 251.
In this step 251, it is checked whether or not the key input in step 111 is the up key KUP. In this case, since it is the up key KUP, the processing is step 251.
To step 252.

Then, in this step 252, the number inputted so far (the reception frequency f in FIG.
It is checked whether 12) is in the reception band. In this case, since it is "90" and is in the reception band, the process proceeds from step 252 to step 253. Then, in this step 253, the scan is started in the ascending direction from the frequency 90 MHz of the numeral "90" input so far.

That is, the frequency division ratio N corresponding to 90 MHz is
The frequency dividing circuit 22 is set in the frequency dividing circuit 22, and thereafter, as shown in FIG. 11E, for example, the frequency dividing ratio N is incremented by "1" at a predetermined speed, and the reception frequency f12 becomes 90.
It changes in the direction of rising in steps of 50 kHz from MHZ.
During this scan, the detection output of the detection circuit 18 is checked, and when the signal S12 can be received, the scan is stopped at the frequency f12 and the reception state at the frequency f12 is continued.

When the signal S12 is received, or when the scan proceeds to the maximum reception frequency of the reception band, the process proceeds from step 253 to step 281.
In step 281, the mode flag is changed from the direct channel selection mode to the normal mode to cancel the direct channel selection mode, and then the process proceeds to step 192 through step 191, and this routine 100 ends.

After inputting up to "90", when the key input is waited in the next step 111, if the down key KDWN is pressed, the process proceeds from step 111 to step 222 through steps 112, 113 and 221.
Proceed to. In this case, since the key input in step 111 is the down key KDWN, the process proceeds from step 222 to step 251. In this case, however, the key input in step 111 is not the up key KUP, the process is step 251. To step 261. And
In this step 261, it is checked whether the key input in step 111 is the down key KDWN,
In this case, the down key is KDWN, so the process is step 2
The processing proceeds from 61 to step 262.

Then, in this step 262, it is checked whether or not the number inputted so far is within the reception band. In this case, it is "90" and it is within the reception band. Step two
Proceed to 63. Then, in this step 263, the scanning is started in the descending direction from the frequency 90 MHz of the numeral "90" inputted so far. That is, 90 MHz
The frequency division ratio N corresponding to is set in the frequency division circuit 22, and thereafter, at a predetermined speed, the frequency division ratio N is decremented by "1", and the reception frequency f12 is from 90 MHz.
It is changed in the descending direction in 50 kHz steps. And
During this scan, the detection output of the detection circuit 18 is checked, and when the signal S12 can be received, the scan is stopped at the frequency f12 and the reception state at the frequency f12 is continued.

When the signal S12 is received, or when the scan proceeds to the lowest reception frequency of the reception band, the process proceeds from step 263 to step 281.
In this step 281, the mode flag is released from the direct channel selection mode to the normal mode, and then the processing proceeds to step 192 through step 191, and this routine 100 is ended.

Therefore, the reception frequency f12 is input halfway, and then the up key KUP or the down key KDW is entered.
When N is pressed, the scan in the ascending direction or the descending direction is executed from the input reception frequency f12, and when the signal S12 is received, the scan ends in the reception state of the signal S12.

-1 When the scanning start frequency f12 is incorrect (part 1) This is because when the direct channel selection mode is entered and a key input is awaited, the reception frequency f12 is not specified at all and the up key KUP or This is when the down key KDWN was pressed. Then, in this case, the scan in the ascending direction or the descending direction is performed from the lowest reception frequency or the highest reception frequency of the reception band.

That is, by pressing the direct tuning key KDT, the routine 100 is executed and step 11
If the up key KUP is pressed while waiting for key input in step 1, DGTC = 1, so the process proceeds to step 11.
1 through steps 112 and 121 to step 122
Then, in this case, since the key input in step 111 is not the numeric key KNUM, the process proceeds to step 122.
From step 151, it is checked in step 151 whether the key input in step 111 is the up key KUP.

Then, in this case, since it is the up key KUP, the process proceeds from step 151 to step 154,
In step 154, the frequency division ratio N corresponding to the lowest reception frequency is set in the frequency division circuit 22, and
Thereafter, at a predetermined speed, the frequency division ratio N is incremented by "1", and the reception frequency f12 becomes 50 from the lowest reception frequency.
It changes in the upward direction in steps of kHz. During this scan, the detection output of the detection circuit 18 is checked, and when the signal S12 can be received, the reception frequency f
The scan is stopped at 12 and the reception state at the reception frequency f12 is continued.

Then, when the signal S12 is received, or when the scan proceeds to the maximum reception frequency of the reception band, the process proceeds from step 154 to step 181.
In this step 181, the mode flag is released from the direct channel selection mode to the normal mode, and thereafter, the processing proceeds to step 192 through step 191, and this routine 100 ends.

If the down key KDWN is pressed while waiting for a key input in step 111, the process proceeds from step 111 to steps 112, 121 and 12.
Although the process proceeds to step 151 through step 2, since the key input in step 111 is not the up key KUP in this case, the process proceeds from step 151 to step 161, and in step 161, the key input in step 111 is the down key KDWN. It is checked whether or not there is, and in this case, since it is the down key KDWN, the process proceeds from step 161 to step 164.

Then, in this step 164, the frequency division ratio N corresponding to the highest reception frequency is set in the frequency division circuit 22, and thereafter the frequency division ratio N is decremented by "1" at a predetermined speed. The reception frequency f12 is changed from the highest reception frequency in the descending direction in steps of 50 kHz. During this scan, the detection output of the detection circuit 18 is checked, and when the signal S12 can be received, the scan is stopped at the reception frequency f12 and the reception state at the reception frequency f12 is continued.

Then, when the signal S12 is received, or when the scan proceeds to the lowest reception frequency of the reception band, the process proceeds from step 164 to step 181.
In this step 181, the mode flag is changed from the direct channel selection mode to the normal mode and the direct channel selection mode is released. After that, the process proceeds to step 192 through step 191, and this routine 100 ends.

Therefore, when the up key KUP or the down key KDWN is pressed immediately after entering the direct channel selection mode, the direct channel selection mode is ignored or released and scan reception is performed.

-2 When the scan start frequency is incorrect (No. 2): When the scan is started from the specified reception frequency f12, the specified reception frequency f12
Is outside the reception band. In this case, scanning is performed in the ascending or descending direction from the lowest receiving frequency or the highest receiving frequency of the receiving band regardless of the designated receiving frequency f12.

That is, when the up key KUP is pressed,
When the frequency designated as the scan start frequency is outside the reception band, the process proceeds from step 252 to step 25.
In step 254, the frequency division ratio N corresponding to the lowest reception frequency is set in the frequency division circuit 22, and thereafter the frequency division ratio N is set to "1" at a predetermined speed.
The reception frequency f12 is changed in the increasing direction from the lowest reception frequency in steps of 50 kHz.
During this scan, the detection output of the detection circuit 18 is checked, and when the signal S12 can be received, the scan is stopped at the reception frequency f12 and the reception state at the reception frequency f12 is continued.

Then, when the signal S12 is received, or when the scan proceeds to the maximum reception frequency of the reception band, the process proceeds from step 254 to step 281.
In this step 281, the mode flag is released from the direct channel selection mode to the normal mode, and then the processing proceeds to step 192 through step 191, and this routine 100 is ended.

If the down key KDWN is pressed and the frequency designated as the scan start frequency is outside the reception band, the process proceeds from step 262 to step 264.
In step 264, the division ratio N corresponding to the highest reception frequency is set in the division circuit 22, and thereafter, the division ratio N is decremented by "1" at a predetermined speed. , The reception frequency f12 is changed in the descending direction in steps of 50 kHz from the maximum reception frequency. During this scan, the detection output of the detection circuit 18 is checked, and when the signal S12 can be received, the scan is stopped at the reception frequency f12 and the reception frequency f12 is received.
Reception status at 12 continues.

Then, when the signal S12 is received, or when the scan proceeds to the lowest reception frequency of the reception band, the process proceeds from step 254 to step 281.
In this step 281, the mode flag is released from the direct channel selection mode to the normal mode, and then the processing proceeds to step 192 through step 191, and this routine 100 is ended.

Therefore, when the scan is executed from the frequency f12 outside the reception band, the scan is performed in the ascending direction or the descending direction from the lowest reception frequency or the highest reception frequency of the reception band regardless of the designated reception frequency f12.

-3 When the scan start frequency is incorrect (part 3) This is because the input reception frequency f12 is outside the reception band at -1 or -2, and all digits of the input numbers are displayed on the LCD 46. This is when the up key KUP or the down key KDWN is pressed in the case of blinking display. In this case, the designated reception frequency f12
Regardless, the scan is performed in the ascending direction or the descending direction from the lowest reception frequency or the highest reception frequency of the reception band.

That is, when the frequency f12 outside the reception band is input, as described in -1, in step 241, as shown in the bottom row of FIG. 10C,
The number of the reception frequency f12 displayed on the LCD 46 is
All the digits are displayed in blinking, and then the process returns to step 111 through step 191 to wait for key input.

Then, when the UP key KUP is pressed, in this case, after inputting all the numbers of the reception frequency f12 and DGTC = 6, the process proceeds from step 111 to step 322 through steps 112, 113 and 321. In this step 322, since the key input in step 111 is not the numeric key KNUM, the process proceeds from step 322 to step 351.

Then, in this step 351, it is checked whether or not the key input in step 111 is the up key KUP. In this case, since it is the up key KUP,
The process proceeds from step 351 to step 354. Then, in step 254, the frequency division ratio N corresponding to the lowest reception frequency is set in the frequency division circuit 22, and thereafter, at a predetermined speed, the frequency division ratio N is incremented by "1", and reception is performed. The frequency f12 is changed in the increasing direction in steps of 50 kHz from the lowest reception frequency. During this scan, the detection output of the detection circuit 18 is checked, and when the signal S12 can be received, the scan is stopped at the reception frequency f12 and the reception frequency f12 is received.
The reception status at is continued.

When the signal S12 is received, or when the scan proceeds to the maximum reception frequency of the reception band, the process proceeds from step 354 to step 381.
In step 381, the mode flag is released from the direct channel selection mode to the normal mode, and then the process proceeds to step 192 through step 191, and this routine 100 is ended.

If the down key KDWN is pressed while waiting for a key input in step 111, the process proceeds from step 111 to steps 112, 113 and 32.
1. Go to step 351 through 1,322, in this case,
Since the key input in step 111 is not the up key KUP, the process proceeds from step 351 to step 361.

Then, in this step 361, it is checked whether the key input in step 111 is the down key KDWN. In this case, since it is the down key KDWN, the process proceeds from step 361 to step 364.
Then, in this step 364, the division ratio N corresponding to the highest reception frequency is set in the division circuit 22, and thereafter, the division ratio N is decremented by "1" at a predetermined speed, The reception frequency f12 is changed in the descending direction from the maximum reception frequency in steps of 50 kHz. During this scan, the detection output of the detection circuit 18 is checked, and when the signal S12 can be received, the scan is stopped at the reception frequency f12 and the reception frequency f12 is received.
Reception status at 12 continues.

Then, when the signal S12 is received, or when the scan proceeds to the lowest reception frequency of the reception band, the process proceeds from step 364 to step 381.
In step 381, the mode flag is released from the direct channel selection mode to the normal mode, and then the process proceeds to step 192 through step 191, and this routine 100 is ended.

Therefore, when the scan is performed from the frequency f12 outside the reception band, the scan in the ascending direction or the descending direction is performed from the lowest reception frequency or the highest reception frequency of the reception band regardless of the designated reception frequency f12.

Others When the direct channel selection mode is entered, but the reception frequency f12 is not confirmed, and key input is awaited in step 111, the direct channel selection key KDT, the numeric key KNUM, the up key KUP or When a key other than the down key KDWN is pressed, the processing is from step 161, 261, or 361 to step 181, 281, or 381.
, So the direct tuning mode is canceled.

<< Preset of reception frequency f12 >> When an arbitrary reception frequency f12 is selected, the preset key K
When one of the numeric keys KNUM, for example, the “0” key is pressed while pressing PS, for example, the frequency division ratio N becomes “0” in the RAM 34 as data indicating the reception frequency f12 at that time.
It is stored in the area corresponding to the key.

Therefore, an arbitrary reception frequency f12 is preset in each of the numeric keys KNUM "0" to "9".

<< One-touch tuning of preset reception frequency f12 >> In the normal mode, if the "0" key of the numeric keys KNUM is pressed, "0" in the RAM 34
The frequency division ratio N stored here is read from the area corresponding to the key, and the read frequency division ratio N is set in the frequency division circuit 22. Therefore, the frequency f12 preset in the "0" key is selected.

Thus, when the numeric key KNUM is pressed, the frequency f12 preset in the pressed numeric key is
One-touch channel selection.

[0116]

According to the present invention, one direct channel selection key KDT can be used both when entering the direct channel selection mode and when canceling the direct channel selection mode.
Operability is good. Further, since the number of keys is prevented from increasing, the operation panel does not become complicated and the keys do not become confusing, and the operability is good and the design is advantageous.

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of the present invention.

FIG. 2 is a flowchart showing a part of an example of a tuning routine.

FIG. 3 is a flowchart showing an example of a continuation of FIG.

FIG. 4 is a flowchart showing an example of a continuation of FIG.

5 is a flowchart showing an example of a continuation of FIG.

FIG. 6 is a flowchart showing an example of a continuation of FIG.

FIG. 7 is a diagram showing an example of a relationship between a key operation and a display state.

FIG. 8 is a diagram showing an example of a relationship between a key operation and a display state.

FIG. 9 is a diagram showing an example of a relationship between a key operation and a display state.

FIG. 10 is a diagram showing an example of a relationship between a key operation and a display state.

FIG. 11 is a diagram showing an example of a relationship between a key operation and a display state.

[Explanation of symbols]

 10 reception circuit 12 antenna tuning circuit 14 mixer circuit 16 FM demodulation circuit 18 detection circuit 20 PLL 21 VCO 22 variable frequency divider circuit 23 phase comparison circuit 24 oscillation circuit 30 microcomputer 31 CPU 32 ROM 33 RAM 34 RAM 45 display controller 46 LCD 100 Tuning routine KDT Direct tuning key KNUM Numeric key KUP Up key KDWN Down key KPR Preset key

Claims (4)

[Claims] 1. A synthesizer receiver in which a reception frequency can be changed by changing a frequency division ratio of a variable frequency division circuit included in a PLL, and numeric keys from "0" to "9", It has a direct tuning key, and when operating the above direct tuning key in the normal operation mode, it becomes the direct tuning mode.In this direct tuning mode, the When the numeric keys are operated, the frequency division ratio corresponding to the target reception frequency is set in the variable frequency dividing circuit to select the target reception frequency, and in the direct channel selection mode, the target frequency is selected. If the direct tuning key is operated while operating the numeric keys in accordance with the number indicating the reception frequency, Synthesizer receiver to return to the initial state of the door tuning mode. 2. The synthesizer receiver according to claim 1, wherein when the direct tuning key is operated in the initial state of the direct tuning mode, the normal operation mode changes from the direct tuning mode to the normal operation mode. Synthesizer receiver to go back to. 3. The synthesizer receiver according to claim 1, wherein when the numeral indicating the target receiving frequency input by the numeral key indicates a receiving frequency not included in the receiving band, A synthesizer receiver adapted to return to the initial state of direct tuning when the direct tuning key is operated. 4. The synthesizer receiver according to claim 1, claim 2 or claim 3, wherein one of the numeric keys is pressed when in the normal operation mode.
When one is operated, the frequency division ratio corresponding to the reception frequency preset in the operated numeric key is set to the variable frequency circuit and the reception frequency preset in the operated numeric key is A synthesizer receiver designed to be selected.