JPS607220A - Synthesizer receiver - Google Patents

Abstract

PURPOSE:To select efficiently the channel of a broadcast wave in a broadcast wave band where plural reception bands are arranged discretely by using a variable oscillator of a PLL as a local oscillator to control the frequency dividing ratio 1/N of a programmable frequency divider of the PLL. CONSTITUTION:In the PLL11, 12 is the programmable frequency divider having a frequency dividing ratio of 1/N, 13 is a phase comparator and 16 is a low-pass filter. In Figure, 14 is a reference oscillator, an oscillated signal having a frequency of f0 is supplied to a frequency divider 15 having a frequency dividing ratio of 1/K, where the signal is frequency-divided, a reference signal having a reference frequency of f'0 obtained is applied to a phase comparator 13, the phase is compared with an output from a programmable frequency divider 12. This receiver incorporates a microprocessor 17 and includes a clock circuit. Thus, the frequency dividing ratio of the frequency dividers 12, 15 is controlled by a microprocessor 17. Further, the application/disconnection of power to the radio receiver main body, manual channel selection and automatic channel selection or the like are conducted by scanning a key switch of a key matrix circuit 18 connected to the microprocessor 17.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a plurality of IT handles arranged separately.
A synthesizer receiver designed to receive broadcasts.

BACKGROUND TECHNOLOGY AND PROBLEMS J:A In the SW band, a large number of receiving hands on which transmitted radio waves are concentrated are distributed in a scattered manner. For this reason, when receiving broadcasts in the SW band with a synthesizer receiver, it is most troublesome to receive the desired broadcast wave, unlike those that automatically tune in sequentially up to the upper limit of sw;jllo or 6. .

Purpose of the Invention In view of the above, the present invention proposes a synthesizer receiver capable of efficiently selecting broadcast waves in a broadcast wave band in which a plurality of receiving hands are discretely arranged.

1. Summary of the Invention The synthesizer receiver according to the present invention uses a PLL variable oscillator as a local oscillator, and selects a channel by controlling the frequency division ratio 1/N of the PLL programmable frequency divider. In the synthesizer receiver, there is a memory in which the lower limit and upper limit N values NML and NMH corresponding to the lower limit and upper limit frequencies of a plurality of receiving hands arranged in N numbers are stored, and subsequent output from this memory is performed. Based on the output, detect the F limit value NML (or upper limit NMH) of the N value of the nearest receiving band to N (directly NX) corresponding to the receiving frequency currently being received in the first of the plurality of receiving bands. a first detection means for reading the 1·゛ limit value NML (or upper limit value NMH) of the N value of each reception band sequentially from the memory and detecting it from the nearest reception band; N of the desired receiving hand detected by this second detection means
A frequency division ratio setting means in which an N value is set to the lower limit value NML (or upper limit value NM) l), and a 1-' limit value of the N value of the desired reception frequency I' for this frequency division ratio setting means. The calculation of N=N+1 (or N=N-1) is performed cyclically within the range from NML to the upper limit NMH, and N4aNy corresponding to the desired reception frequency is set in the division ratio setting means. The frequency division ratio 1/N of the programmable frequency divider is controlled by the output of the frequency division ratio setting means.

According to the present invention, it is possible to obtain a synthesizer receiver capable of efficiently selecting broadcast waves in a broadcast wave band in which a plurality of reception hands are arranged.

Embodiment A synthesizer receiver according to the present invention will be described below with reference to FIG. The receiver of this embodiment has AM (LW, MW
, SW) and FM broadcast wave bands. In FIG. 1, fl+ is an antenna, (2) is a picture frequency amplifier, (3) is a frequency conversion circuit, (4) is its mixer, and (5) is its local oscillator. This local oscillation (5) is composed of a variable oscillator of a PLL (11) which will be described later. (6) is an intermediate frequency intensifier, (7) is an AM
Detector, (8) is an FM demodulator, (9) is a low frequency amplifier,
00) is a speaker.

Incidentally, in reality, a second frequency conversion circuit and a second intermediate frequency amplifier are provided after the intermediate frequency amplifier (6).
For simplicity, illustration is omitted here.

(II) is PLf, (phase-locked loop), and in each PLL (II), (12) has a frequency division ratio of 1/N
programmable frequency divider, (13) is a phase comparator, (1
6) This is a corbus filter. (14) is a reference oscillator (crystal oscillator), and the oscillation signal from which the frequency is fo is supplied to the frequency divider (15) with a frequency division ratio of 1/, and the frequency is divided by ζ. This reference frequency f is supplied to a phase comparator (I3) and the phase is compared with the output from the programmable frequency divider (I2). Then, LW, MW, SW, FM (1) Frequency divider (I5)
) to change the division ratio of °ζ and the reference frequency [)) to 3, respectively.
kllz, ! ] klLz, 5k112.100kl
It is switched to the pillar that becomes lz.

The 11Jiru synthesizer receiver uses a microprocessor (
17) is built in, and is used to control power on/off of the radio receiver itself, channel selection, etc. This microprocessor (17) also includes a clock circuit. follower ζ, frequency divider (12) and (1
The frequency division ratio of 5) is controlled by the microprocessor (17). - Scanning the key switch of the microprocessor (17) and the key switch of the resox circuit (18), turning on/off the power of the radio receiver, manual tuning, automatic tuning, etc. It is done in such a way that it can be done.

(19) is an indicator controlled by the microprocessor (17), and here the receiving frequency is 1500.
As an example, the figure shows that the broadcast wave band is SW, the meter band length is 3 m, and the current time is 2 am.

Regarding FIG. 2, a part of =1=- corresponding to each key switch of the two-series keema E resource (I8) will be explained. In addition to this key, there are also keys corresponding to keys for setting or correcting the time for the time fit circuit built in the microprocessor □ (I7), a time timer, a time timer, etc., but their illustrations are omitted. In Figure 2 (20
)-(29) are 0, 1°, . . . 9 numeric keys. ,
(30) and <31) are keys for ΔM and FM band selection, respectively. (32) is an execution key. (33) can be pressed together with keys (34) or (35), which will be described later.
), (35) are up and down keys, and (36) is a scan key.

Next is this 213th! ! A general method of channel selection using the synthesizer receiver shown in FIG. 1 will be explained with reference to I.

First, automatic channel selection is performed as follows. While pressing the key (33), press the key (34) or (35) at the same time.

In this way, the lower limit frequency of the receiving hand closest to the receiving frequency currently being received, that is, in the LW, MW, and FM bands, the limited wave number is 153 kllz and 522 kllz, respectively.

In the SW band, the lower limit frequency of each meter band is sequentially detected from C low to high and from high to low depending on the keys (34) and (35) and displayed on the display (19). Then, the indicator (1) indicates that the desired reception band has arrived.
9), these keys (33) and (3)
4) or (35), and then press the scan key (
If you press 36), scanning will be performed cyclically within each meter hand for each receiving hunt, LW, MW, and FM or SW band, and when a broadcast wave is received, scanning will stop there. Then, the broadcast waves are received. Furthermore, if you wish to advance the scanning channel selection, you can press the scanning key (36) again.

Next, manual channel selection will be explained. By pressing the up key (34) or down key (35) alone, the selected frequency changes by one step or decreases at every predetermined frequency, and the display (
19). In this case, the frequency interval is LW
, 3kHz, 9kHz in MW, SW and FM bands, respectively.
5kllz, 100kllz, in the SW band, it doesn't matter whether it's inside or outside the meter hand. Then, when the suppression of the key (34) or (35) is stopped by confirming the frequency display on the display (19) or the sound emitted from the speaker 0ω, the broadcast of the current frequency is received.

Also, if you know the frequency of the broadcast wave to be received in advance, first press the key (30) or (3I) to select AM.

Select the FM, and then press the numeric keypad (20) to (2).
9) to set the reception frequency, and then press the effective key (32) to receive broadcasts on that frequency.

Next, the meter hand in the SW band will be explained with reference to FIG. This meter band is 120.90°75,60
．． 49.41.31.25.21.19.16.13.
There are 13 hands of Ilm. The frequency range of each meter band is shown in the table below.

Next, the functional block diagram of FIG. 4 and the frame r:l- of FIG.
Refer to Char 1. “(, Microphone 1” processor (17
) automatic tuning function for SW band tuning (see Figure 3)
This will be explained using an example. Figure 3 shows the distribution of the meter band M in the SW band. For example, at 131n, the F-limited wave number FM
L is 21450kllz, its upper limit frequency F MH is 2
It is 1850kllz. By the way, let the 1-limit and upper limit N values corresponding to these upper limit and upper limit frequency F ML% F 11H be NML and NMH, respectively.

In FIG. 4, (37) to (40) correspond to the keys in FIG. 2, and key 7 in FIG. That is, the key switch (37) corresponds to the meter hand key (33), and the key switches (3B) and (39) operate the memory provided in the amplifier and microprocessor (7), and store various data. (However, at least the lower and upper N values NHL, NhH1 and LW, MW corresponding to the upper and upper frequencies FML and FMH of the plurality of discretely arranged meter bands M in the SW band mentioned above, respectively) are stored. , each upper limit of the FM band and the lower limit and upper limit N (+NML, NMH) corresponding to the two-limit frequency FML%FMH, respectively. !'ilrik
llz, MW band is 522-1611kllz,
The FM band covers each frequency range from 76 to 108 M112.

First, press the meter band key (33) and simultaneously press the up or down key (34) or (35). In this way, for example, based on turning on the key switch (37) corresponding to the meter band key (33), the first detection means (4
1) - ζ Multiple reception bands (meter hunt) On the other side of M, the reception frequency currently being received (in the case of SW band, regardless of whether it is inside or outside the meter band) Fx (the corresponding N value is Nx) The upper limit NML of the N value of the nearby receiving band (meter band) M is detected. In this case, the nearest receiving band M has one higher and one lower than the receiving frequency px currently being received. °C, meter band key (37)
Depending on which of the up or down keys (34) and (35) is pressed, the nearest receiving band M or the lower receiving band M will be detected by the second detection hand II & (4), which will be described later.
4) , (45).

(44) and (45) store the upper limit NML of the N value of each receiving pan FM sequentially from the nearest receiving band M (47).
A second detection means for detecting "ζ" read from "ζ", which detects up and down detections (44) and (45)
It consists of "ζ". Therefore, when pressing ζ, up or down key (34), (35), press switch (38) or (
A signal based on the signal from 39) is sent to the key switch detector 1.
J (42), detects that the key switch (37) and the key switch (38) or (39) are pressed, and supplies the detection output to the second detection means (44) or (45). be done. ) 114 & N of receiving band M
The upper limit NHL of the N value moves from a lower value to a higher value or from a 101 value to a lower value, and the upper limit value NML of the N value is detected, and this is detected by the frequency division ratio setting means (46).
is also supplied to the display (19) via the microprocessor (17).
The toe limit frequencies FHL corresponding to N 4 * N ML are sequentially displayed. Then, when you stop pressing the key (33) and the up or down keys (34) and (35),
This is detected by the detection means (42), and the reception band at that time, that is, the N value of the desired reception band M, 1, the limit value NMLs, for example, the 13 m hand of the SW band (see Fig. 3).
The upper limit N value NM corresponding to the F range frequency 2145011z
L is set in the frequency division ratio setting means (46).

When the scan key (36) is then pressed, the control means (43) detects that the corresponding key switch (40) has been pressed, and the second detection means (44) or (
The lower limit value NML of the N value of the desired reception band M is supplied from 45), and the control means (43) sets the upper limit value NML of the desired reception band M to the division ratio setting means (46) described in N=N within the range υ11 from the value NML to the upper limit NMH
The f4 calculation of +l is performed circularly.

When a broadcast wave is received, the reception of the broadcast wave is detected based on the detection output of a detection circuit (7) or (8) (not shown), and the microprocessor (17) detects the reception of the broadcast wave.
), the calculation of the ζ control means (43) is stopped. Thus, for example, a broadcast wave of the desired reception frequency FY within the 13m band of the SW band is received. Furthermore, this N=N
In the +1 operation, the N value gradually increases by 6 from the lower limit NtlL.
ζWhen the upper limit value NMH is reached, the N value becomes the limit I1 at that point.
After setting to NML, the calculation of output N-N+1 is performed, and this calculation is performed cyclically until the broadcast is received (F4).Also, if you stop pressing the scan key (36) in the middle, For example, such calculation is stopped and the N value at that time is set by the division ratio setting means (46).If the N value is set by the division ratio setting means (46), this Based on this, the frequency division ratio 1/N of the programmable frequency divider (12) is also set.Of course, when the N value of the N value setting means (46) changes, this is followed and the programmable frequency division The frequency division ratio 1/N of the device (12) also changes.In addition, I-W, MW
And in the FM band °ζ, people's bands are made into one meter band, and "C1 automatic tuning" is performed.

Therefore, for example, key (33) and key (34) or (3
5) Continue to press sw! to select the reception band where the N value of 1.゛ limit value NHL should be detected. When the channel is out of V, the channel shifts to the FM band, MW band, or LW band, and automatic tuning similar to °ζ is performed.

For scanning and tuning within the desired reception band, the upper limit N value N#lH corresponding to the 1st limit frequency is detected, and then - [2nd limit N value NMH to 1st limit N value NML is cyclically selected]. N=
It is also possible to have N-1 operations performed.

According to the above-mentioned synthesizer receiver, the SW band
1 ill! Broadcast waves in a broadcast wave band in which a plurality of receiving bands are distributed can be efficiently selected.

Also, according to this synthesizer receiver, manual tuning is also possible at 1M.
Alternatively, the receiving frequency can be scanned and changed for each predetermined frequency, or the receiving frequency can be manually selected.

According to the present invention described in "Effects of the Invention"-Statement-1, 1ii11 It! F4 is a synthesizer receiver that can efficiently select broadcast waves in a broadcast wave band consisting of multiple receiving hands. I can do things.

[Brief explanation of the drawing]

Fig. 1 is a Zollock diagram showing an embodiment of the synthesizer receiver according to the present invention, Fig. 2 is a layout diagram of its operation keys, and Fig. 3 is an explanatory diagram when selecting a channel in the SW band. , 4th
The figure is a boolean diagram of the automatic channel selection function by the microprocessor, and FIG. 5 is a flowchart for explaining the functional blocks. (3) is a frequency conversion circuit, (4) is a mixer, (5) is a PLL variable oscillator as a local oscillator, and (11) is a PLL
L, (12) is a programmable frequency divider, (17) is a microprocessor, (18) is a key matrix, (I9
) is a display device, (41) is a first detection means, (44). (45) is the second detection means, (43) is the control means, (4
6) is a frequency division ratio setting means.

Claims (1)

[Claims] In a synthesizer receiver that uses a variable oscillator of a PLL as a local oscillator and selects a channel by controlling the division ratio 1/N of a 1-gram pull frequency divider of the PLL, l131j fl, a memory in which are stored the lower limit and ``2 limit NIL, NMH corresponding to each of the 1-limit and 1-range frequencies of a plurality of reception hunts arranged in fl, and a readout output from the memory; Based on ζ'--The first step is to detect the F limit value NML (or upper limit value NMH) of the N value of the receiving hand closest to the N value NX corresponding to the receiving frequency currently being received among the plurality of receiving hands. 1 detection means, and N of each reception pan F' sequentially from the nearest reception band.
(a second detection means for detecting the upper limit value NML (or upper limit NMH) of Illj from the memory;
A frequency division ratio setting means in which an N value is set to the lower limit value NML (or - upper limit value NMH) of the value, and an upper limit value NIL to an upper limit 1i1Y of the N value of the desired receiving hand for the frequency division ratio setting means.
N=N+1 (or N=N-1) within the range of N MH
control means for cyclically performing the performance of N(il\NY) corresponding to a desired reception frequency in the frequency division ratio setting means, and the programmable A synthesizer receiver characterized in that the frequency division ratio of the frequency divider is controlled to 1/N.