JPH0449710A - Automatic memorizing system for radio receiver - Google Patents

Abstract

PURPOSE:To shorten sweep time after the second time of sweep by jumping a frequency area of prescribed frequency width including the frequency of a broadcast wave detected up to the sweep last time in the sweep after the second time of sweep of a prescribed frequency band area. CONSTITUTION:A CPU 21 sets relatively high comparison electric field strength by decreasing the gain of an RF amplifier 11 by outputting an attenuation signal ATT to the RF amplifier when a switch M is operated. When it is decided that a station exists, a signal S meter at that time is converted to electric field strength data SL, and the level of the data is decided. Thence, preset is performed in sequence of highest strength. Such processing is performed at another working area separately from preset area 51-56, and when definition is completed, it is stored in the preset area. In the second time of sweep, relatively low comparison electric field strength is set. No SD wait for the frequency already stored in the first time of sweep and the frequency separated from the frequency by the number of inter-station frequencies are performed.

Description

[Detailed Description of the Invention] [Summary] Regarding the auto-memory method of a radio receiver that sweeps a predetermined frequency band multiple times by switching the comparative electric field strength, when performing the second and subsequent sweeps, the detection from the previous sweeps is performed. By skipping the frequency range of a predetermined frequency width that includes the frequency that has been detected, the sweep time from the second time onward is shortened.

[Industrial application field]

The present invention relates to an O-memory system for a radio receiver that switches the comparison field strength and sweeps the field multiple times.

[Conventional technology]

BACKGROUND ART Conventionally, radio receivers equipped with an auto-memory function that automatically sweeps the broadcast waves receivable by the radio receiver and stores the frequency information in a memory have become popular. Such an auto-memory function sweeps a predetermined frequency band, and if a broadcast wave with a reference field strength or higher is detected, the frequency information (for example, if the radio receiver is of the P L 1 type) is The frequency division ratio N) of the variable frequency divider in the PLL is stored in the precent memory.

Since preset memory for a plurality of channels is used for -a, frequency information for a plurality of cycles is preloaded.

However, one sweep may not reach the number of preset memories and no broadcast waves may be detected.

In such a case, there is a method of performing a second sweep by lowering the comparative electric field strength, detecting broadcast waves with low electric field strength that could not be detected in the first sweep, and storing the frequency information in the remaining recent memory. is also commonly done.

Since it is impossible for the copier to determine at all which station is recently assigned to which channel due to its auto-memory function, it is sometimes sorted, for example, in descending order of channel number so that the electric field strength increases.

[Problem to be solved by the invention]

As described above, in the auto-memory method in which multiple sweeps are performed simultaneously while decreasing the comparative electric field strength, in the second and subsequent sweeps, the broadcast waves detected in the previous sweeps are overlapped and detected. In such a case, it is meaningless to store the same broadcast wave in a separate memory for each sweep, and also prevents effective use of the memory. For this reason, conventionally, the frequency detected by sweeping is compared with an already preset frequency, and the result is 1. If it is, I try not to overlap it (briseso) L.

However, if an unnecessary frequency is detected like this, the sweep function will wastefully stop at that frequency for a certain period of time. The disadvantage is that it takes a long time.

The present invention aims to shorten the sweep time from the second time onward by avoiding the above-mentioned wasteful sweep stop.

[Failure to solve the problem]

In order to solve the above-mentioned problems, the present invention sweeps a predetermined frequency band, detects broadcast waves in a reference field strength layer, and converts the frequency information of the detected broadcast waves into
A radio receiver that performs an auto-memory operation to automatically store information in the memory, sweeps a predetermined frequency band, and then, if there is an unstored preset memory, lowers the comparative field strength and continues the auto-memory operation. In the automatic memory method, the second sweep of the predetermined frequency band is controlled to skip a frequency range of a predetermined frequency width including the frequency of the broadcast wave detected in the previous sweep. This is a characteristic feature.

[For production]

When performing the second and subsequent sweeps, the frequency information of the broadcast waves extracted in the previous sweeps is already known.

Furthermore, the frequencies of multiple broadcast waves in the same area are set so as not to be close to each other in order to prevent interference such as interference.

Therefore, in the second and subsequent sweeps, even if the frequency range of a predetermined frequency width including already known frequencies is skipped, necessary broadcast stations will not be skipped, and the sweep time for the second and subsequent sweeps can be shortened. can.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

11 is an antenna; RF amplifier selectively tunes and amplifies broadcast waves from 0; 13 is a local oscillator that generates a local oscillator signal with a frequency corresponding to the receiving frequency; 12 is a signal from local oscillator 13 and radio frequency (RF) The mixer I4 mixes the high frequency signal from the amplifier 11 and converts the frequency to an intermediate frequency.
) amplifier, 15 is a detector that converts the signal from the LF amplifier 14 into an acoustic signal, 16 is a low frequency amplifier that amplifies the acoustic signal from the detector 15, and drives the spill force 17;
18 is R based on the strength of the signal from the IF amplifier 14.
These are A, GC amplifiers that control the gain of F amplifier II. The receiving unit 1 is configured by these configurations.

On the other hand, 21 is a central processing unit H (cPU) that controls each part;
22 is a memory provided in connection with the CPtJ 21 and includes preset areas 51 to 56 in which frequency data etc.
Ajilog/digital (A/I) converter that digitally converts and generates electric field strength data S L, 24 is CP tJ
This is a unit that controls the receiving frequency to set the receiving unit to 1 in accordance with the N value, which is the frequency value obtained from 21. These configurations constitute a control unit 76 and two units 12.

The control unit 2 also includes a switch M for starting the memory operation, and a switch M for selectively reading out the frequency data stored in the memory 22 and performing reception based on the frequency data. ,/toisochi P1-P6
is provided.

Note that the RF amplifier 11 attenuates the broadcast waves received by the antenna 10 by a predetermined attenuation degree (for example, 40 dB) using the attenuation signal AT'T'' output from the CPU 21.
Further, the tuning frequency is controlled to change by a bias signal 1'B output from the PI, I, and unit 24. The bias signal 1'[) is also given to the local oscillator 13, and the local oscillator (f
A PLL loop is constructed by transferring the i number 1-0 to the I'L, , I-, knit 24.

In addition, the wave detector 15 outputs to the control unit 2 a two-tone signal SD indicating whether or not a broadcast wave exists at the frequency currently being tuned, and a signal S make indicating the electric field strength of the frequency currently being tuned. are doing. Signal S D at control port, leek 1-2
is directly taken into the CP LJ 21, and the signal S meter is converted into electric field strength data SL5 by the A/D converter 23t, and then taken into the CU:21.

Note that the signal S meter is obtained by envelope detection of the intermediate frequency signal given from the IF amplifier 14 to the detector 15, and the signal SD is obtained by detecting the intermediate frequency signal given to the detector 15 from the IF amplifier 14. The corresponding group f! This is obtained by comparing the lightning voltages and determining whether the signal S meter is greater than the GL voltage. Therefore, the CPU 21 outputs the attenuation signal A T
The comparative electric field strength corresponding to the reference voltage can be changed relatively by T.

Next, the operation of this embodiment will be explained. Figure 2 is CI) U21
3 is a flowchart showing the operation of FIG.

CP 1. , J 21 starts processing from step 2 switch S1 when switch M is turned 1 to 1. Step Sl outputs the attenuated signal ATT to the RF amplifier 11 and outputs the attenuated signal ATT to the RF amplifier 11. This is a process of setting a relatively high comparative electric field strength by lowering the gain of the F amplifier. The first sweep is performed in this state. First, in step S2, the N value is set to one level from the lower limit,
In step S3, the controller waits for the transmission time of 1/1000 second order required for the signal "i3.. SD to rise after changing the N value (SD WAIT). After this, in step S4, the broadcast wave is received based on the presence or absence of the signal SD. If it is determined that there is no station, it is determined in step S5 whether the frequency upper limit has been reached or if it is old, and if it has not been reached, proceed to step S2. Go back and change the N value.

If it is determined that the broadcast wave is received in step S4, SD WAIT is performed once again in step S6, and SD determination is performed again in step S7. If it is determined that there is no station here, the first attempt was an error, so step S
Moving on to step 5, if it is determined that there is a station, it is certain, so in step S8 the signal S meter at that time is converted into electric field strength data SL and its rail is determined. Then, using the level determined at this time, in step S9, the N values detected so far are sorted (rearranged). This is because even if the broadcast waves are detected by the signal SD, each of them has a certain magnitude, so it is determined based on the electric field strength data SL and the broadcast waves are displayed in descending order of strength. This process is performed in a work area different from the brisset areas 51 to 56, and once determined, it is stored in the preset area in step SIO and the process returns to step S5.

After repeating the above-mentioned two processes, if it is determined that the upper limit is reached in step S5 after n cycles are repeated in step SIO, the number of memory stations is determined in step SIN, and if the number of memory stations has not already reached 6, the memory is reset for the second time in steps 812 and below. Perform a sweep.

In the second sweep, first, in step S12, the attenuation signal ATT is
The output of the RF amplifier is stopped, the gain of the RF amplifier is returned, and a relatively low comparison electric field strength is set.

Steps S13 to S21 following step S12 are basically the same as steps S2 to SIO of the -th time. (II
, the second time, step S is performed between steps S13 and 314.
22 is added so as not to stop at the frequency stored in the first sweep and frequencies close to it (for example, frequencies on both sides). For example, the N value changed in step S13 may be the already stored N value, N value + 1. N
If the value is 1, the process moves to step S13 to change the N value, and if the range is 1, the process moves to step 514 to perform processing such as determining the presence or absence of broadcast waves.

Incidentally, the sorting in step S20 is performed for stations excluding the n stations detected at the first time.<(6-n) stations.

Further, in this embodiment, the third sorting is not performed, so if it is determined in step S16 that the frequency is at the upper limit, all auto-memory operations are terminated even if there are fewer than 6 stations.

In this way, according to this embodiment, SDV and /AIT are not performed for the frequency already stored in the first sweep and the frequency separated by the inter-office frequency from that frequency.
The time it takes to complete auto preset can be shortened.

Next, another embodiment of the present invention will be described. FIG. 3 is a flowchart showing another embodiment of the present invention, and FIG.
This is an improved version of the corresponding process.

In FIG. 3, the same parts as in FIG.

When the first sweep process is completed through steps 81 to SIO shown in FIG. 2(a) and it is determined that the number of memory stations is not 6 through step SIX, the process moves to step S12, where the output of the attenuation signal ATT is stopped and the RF Return the gain of the amplifier, set a relatively low comparison electric field strength, and proceed to step S3.
Move to 0. In step S3O, a value corresponding to the lower limit of the frequency band to be swept is set as the N value. and the current N
It is determined whether the value is already stored (step 531), and if the N value is already stored, step S3
2, and if the information has not been stored, the process moves to step S14 to perform processing such as determining the presence or absence of broadcast waves.In step S32,
The current N value is increased by 1 and the process moves to step S33.

In step S33, it is determined whether or not the current N value +1 is stored, and if the N value 41 is stored, step S33 is performed.
34, increase the N value by 2, and return to step S3.
Move on to 3. If the N value + 1 is not stored in step S33, the process moves to step S14 and processes such as determining the presence or absence of broadcast waves are performed.

As described above, according to this embodiment, N(!
If it is determined that +1 is memorized, its N value, N+1
．． It is determined that there is no broadcast wave to be stored at the frequency corresponding to the N value of 4-2 (the N value +1 is already stored, so
N value, N value +1. N value 2 corresponds to frequencies that do not need to be memorized)
The N value is increased by 2 in step S34, and the N value is determined again in step S33. Also, the second
In step S22 shown in the figure (bl), the current N4Ii, N
While it is determined whether or not the value -1°N(!+1) has been stored, in this embodiment, it is only determined whether or not the value N→-1 has been stored.

Therefore, there is an advantage that the number of N value determination processes is reduced 2 and the processing time can be further shortened, compared to the fruitful side-stepping shown in FIG. 2 (bl).

〔Effect of the invention〕

As described above in detail, the present invention has the advantage that the operating time of the auto memory, which performs multiple sweeps while gradually lowering the comparative electric field strength, can be shortened by eliminating unnecessary sweep stop time. be.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 (A
), FIG. 2(B) is a flowchart 1-1 showing the operation of the CPU 21, and FIG. 3 is a flowchart 1-1 showing another embodiment of the present invention. In the figure, 1: l Uniso l-, 2: Control Uniso 1.1
0: Antenna, 11: RF amplifier, 12: Mixer, 13
: Local oscillator, 14: IF amplifier, 15: Detector, 21
: CPLI, 22: Memory, 23: A/D converter, 24
:PLL unit.

Claims (1)

[Claims] Sweeps a predetermined frequency band to detect broadcast waves with a reference field strength or higher, and performs an auto memory operation that automatically stores frequency information of the detected broadcast waves in a preset memory. If there is an unstored preset memory after a sweep, the auto memory method of the radio receiver continues the auto memory operation by reducing the comparison electric field strength. An auto-memory system for a radio receiver, characterized in that it performs control to sweep by skipping a frequency range of a predetermined frequency width that includes the frequency of a broadcast wave detected in the sweep.