JPH0746766B2 - Radio receiver - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a radio receiver capable of preset and scan reception.

[Conventional technology]

A synthesizer type radio receiver can be configured as shown in FIG. 1, for example.

That is, in the example of this figure, the reception range is AM band (150 kHz to 30 MHz), air band (aviation radio: 116 MHz).
~ 136MHz) and FM band (76MHz ~ 108MHz). Further, (10) shows an AM band and air band receiving circuit. During reception of the AM band, a high frequency signal (broadcast wave signal) mainly in the medium wave band is received by the bar antenna (11), and this signal is supplied to the high frequency amplifier. It is supplied to the bandpass filter (13) for preselection through (12) and
The rod antenna (14) mainly receives high-frequency signals in the long-wave band and the short-wave band, supplies this signal to the filter (13), and extracts only the signal in the AM band from the filter (13).

Then, this signal is supplied to the first mixer circuit (16) through the band switching switch circuit (15), and the first local oscillation frequency Sa of a predetermined frequency is mixed from the first local oscillation circuit (17) to the mixer. Of the signals supplied from the filter (13) to the circuit (16), only the signal of the frequency desired to be received is frequency-converted into the first intermediate frequency signal of the frequency 55.845 MHz. Then, this signal is supplied to the second mixer circuit (21) through the first intermediate frequency amplifier (18), and at the same time, the second local oscillation signal of a constant frequency is output from the second local oscillation circuit (22) to the mixer circuit ( 21) supplied to the first
The intermediate frequency signal is frequency-converted into a second intermediate frequency signal having a frequency of 455 kHz, for example.

Further, this signal is supplied to the AM detection circuit (24) through the second intermediate frequency amplifier (23) to demodulate the audio signal,
This signal is supplied to the speaker (43) through the band switching switch circuit (41) and further through the amplifier (42).

In this case, the local oscillator circuit (17) is configured by a PLL and is supplied with a control signal so that the frequency of the local oscillator signal Sa can be arbitrarily set or changed in steps of 1 kHz, for example. Therefore, in the AM band, the reception frequency can be arbitrarily set or changed in 1 kHz steps.

When receiving an air band, a high frequency signal from the antenna (14) is supplied to the tuning circuit (19) to extract a signal of a frequency desired to be received, and this signal is passed through a switch circuit (15) to a mixer circuit (16). ) And frequency-converted into the first intermediate frequency signal by the local oscillation signal Sa, and thereafter, the audio signal is supplied to the speaker (43) in the same manner as when receiving the AM band.

In this case, the tuning circuit (19) is composed of, for example, a variable capacitance diode, and the tuning frequency can be changed by a control signal. Therefore, in the air band, the reception frequency can be arbitrarily set or changed in steps of 1 kHz, for example.

Further, at the time of receiving the AM band and the air band, the intermediate frequency signal is supplied from the intermediate frequency amplifier (23) to the detection circuit (25) and the detection signal indicating the presence or absence of broadcasting is taken out.

Further, (30) indicates an FM band receiving circuit. When receiving in the FM band, the high frequency signal from the antenna (14) is supplied to the bandpass filter (31) for preselection and FM.
Only the band signal is taken out, this signal is supplied to the mixer circuit (32), and at the same time, the local oscillation signal Sf of a predetermined frequency is supplied from the local oscillation circuit (33) to the mixer circuit (32) for reception. Only the signal of the frequency to be
The signal is frequency-converted to an intermediate frequency signal of 10.7MHz, this signal is supplied to the FM demodulation circuit (35) through the intermediate frequency amplifier (34) and the audio signal is demodulated, and this signal is further amplified through the switch circuit (41). It is supplied to the speaker (43) through the (42).

In this case, the local oscillator circuit (33) is configured by a PLL and is supplied with a control signal so that the frequency of the local oscillator signal Sf can be changed in 100 kHz steps, for example.
Therefore, in the FM band, the reception frequency can be arbitrarily set or changed in 100 kHz steps.

Further, during reception of the FM band, the intermediate frequency signal from the intermediate frequency amplifier (34) is supplied to the detection circuit (36) and the detection signal indicating the presence or absence of broadcasting is taken out.

Further, (50) shows a microcomputer for controlling the reception frequency, and (51) shows a CP of 4-bit processing.
U, (52) is a ROM where various programs are written,
(53) RAM for work area, (54) input port,
(55) is an output port, and these circuits (52) to (55) are connected to the CPU (51) through the system bus (56).

Further, the microcomputer (50) has, for example, a memory (59) connected to the outside. When the reception frequency is preset, the memory (59) stores band data BAND indicating which of the AM band, the air band and the FM band the reception frequency belongs to and frequency data indicating the reception frequency. This is for remembering FREQ and
It has addresses (capacity) for n stations, that is, it has addresses B _{1 to} Bn for band data BAND and addresses F _{1 to} Fn for frequency data FREQ. The memory (59) is made non-volatile by being backed up by, for example, a battery.

Further, the microcomputer (50) has a ten-key (61) for directly setting the reception frequency, n tuning switches S _{1 to} Sn for presetting the reception frequency, and a preset for performing the preset. The switch Sp and the scan switch Ss for scanning the preset frequency are connected. In addition, these switches (6
1), S _{1 to} Sn, Sp, Ss are all non-locking type push-type normally open switches.

Further, the detection signal of the detection circuit (25) or (36) is taken out through the switch circuit (44), and this signal is supplied to the microcomputer (50).

Then, in the microcomputer (50), the switch (61), S ₁
~ A control signal for setting the reception band and the reception frequency is formed based on the outputs of Sn, Sp, Ss, and the control signal is generated by the circuits (15), (17), (19), (33), (41), Supplied to (44).

Further, in the microcomputer (50), a display signal for displaying the reception band and the reception frequency is formed, and this signal is supplied to a display device, for example, the LCD (62).

Then, the following operation is performed by the microcomputer (50). That is, for example, "8" of the numeric keypad (61),
If you press the "1", "0" or "Execute" key, the microcomputer (5
In (0), a control signal corresponding to the key operation is formed, the switch circuits (15) and (41) are connected to the state shown in the figure by this control signal, and the frequency of the local oscillation signal Sa is controlled so that the frequency is 810 kHz. Is selected. Further, other frequencies are similarly selected by the ten key (61). Therefore, it is possible to directly select the broadcast of the desired frequency with the ten keys (61).

Moreover, when an arbitrary frequency f _i is set as the reception frequency,
Any switch Sj (1 ≦ j ≦ among the switches S _{1 to} Sn)
When you press the switch Sp while pressing and n), and the reception band data BAND that the frequency f _i belongs, data of frequency f _i FREQ
Are formed, and these data BAND, FREQ are stored in the memory (5
Of the addresses B _{1 to} B _n and F _{1 to} Fn in 9), they are stored in the addresses Bj and Fj corresponding to the switch Sj, respectively. Therefore, it is possible to preset the number of switches S _{1 to} Sn, that is, broadcasting for n stations.

Further, when any switch Sj of the switches S _{1 to} Sn is pressed, the data BAND, FREQ is taken out from the corresponding address Bj, Fj of the memory (59) and these data BAND, FREQ are fetched.
A predetermined control signal is formed on the basis of the control signal, the reception band and the reception frequency are controlled by this control signal, and the switch Sj
The frequency f _i preset in is the reception frequency. Therefore, the broadcasting of n stations can be preset-received by the switches S _{1 to} Sn.

When the scan switch Ss is pressed, the data BAND and FREQ are fetched from the first addresses B ₁ and F _{1 of} the memory (59) and are preset in the _first switch S ₁ based on these data BAND and FREQ. The specified frequency is used as the reception frequency, and if broadcasting is not being performed at this reception frequency, immediately after broadcasting for 5 seconds, data from the next address B ₂ , F _{2 of} the memory (59) BAND, FRE
Q is taken out, and second based on these data BAND and FREQ
The frequencies preset in the switches S _{1 to} Sn are sequentially received such that the frequency preset in the _second switch S ₂ is set as the reception frequency. That is, the frequencies preset in the switches S _{1 to} Sn are sequentially scanned.

Note that when the frequency f _i which is optionally preset, pressing the switch Ss again, the scan is terminated at that frequency f _i, thereafter, followed by the reception state of the frequency f _i. Also, when the scan is performed up to the last switch Sn frequency,
Again, the frequency of the first switch S ₁ is reached, and so on.

In this way, this receiver can receive various broadcasts over a plurality of reception bands.

By the way, in Tokyo, for example, 7 medium-wave broadcasting stations, FM
Can receive 3 to 4 stations. Also, in shortwave broadcasting, the propagation state of radio waves changes greatly depending on the season and time, so the broadcasting station transmits the same broadcasting content at multiple different frequencies, and the listener (reception side) is the best of these multiple frequencies. It is usual to select and receive. Moreover, shortwave broadcasting can receive many stations.

Therefore, in the receiver capable of receiving various broadcasts over a plurality of reception bands as described above, the number n of the switches S _{1 to} Sn is n.
Is more convenient, for example 32 switches S _{1 to} S ₃₂
(N = 32) is convenient.

Also, if 32 switches S _{1 to} S ₄₆ can be connected in a matrix of 4 rows and 8 columns, therefore, when the switch output is taken into the microcomputer (50) by the dynamic scan, the CPU (51) Is also a 4-bit process, so there is no waste in the dynamic scan.

[Problems to be solved by the invention]

However, if there are 32 switches S _{1 to} S ₃₂ in this way, and if scan reception is performed by the switch Ss, if there is a broadcast, scanning is stopped for 5 seconds for each of the switches S _{1 to} Sn. So it takes 16 before the scan completes.
It takes 0 seconds (= 5 seconds x 32). Therefore, such as when a station wishes is preset towards the end of the switch S ₁ to S _32, or when the scan is gone too far, it is very inconvenient.

The present invention is intended to solve such a problem.

[Means for solving problems]

Therefore, in the present invention, three band switches Ba, Bb, corresponding to the AM band, the air band and the FM band,
When Bc is provided and, for example, the switch Ba is operated, when the scan reception is performed by the switch Ss, all the frequencies in the AM band are skipped, and the scan is performed only in the air band and the FM band.

[Action]

Therefore, according to the present invention, even if a large number of frequencies are preset, only the necessary reception band is scanned, so that the target frequency can be received in a short time.

Also, for example, if switches S _{1 to} S ₃₂ are divided into groups and scanning is skipped for each group, the switches are switched.
Since the frequencies that can be preset to S _{1 to} S ₃₂ are limited, according to the present invention, scanning is skipped for each reception band, so that the switches S _{1 to} S ₃₂ can be freely preset.

〔Example〕

That is, in FIG. 1, band switches Ba, Bb, Bc and skip switch Sk are connected to the microcomputer (50). In this case, the switches Ba to Bc correspond to the AM band, the air band, and the FM band respectively, and set whether or not to skip when scanning the corresponding band. All of them are non-locking type and push type normally open. It is a switch. Further, the switch Sk is a safety switch for operating the switches Ba to Bc, and if the switches Ba to Bc are pressed while pressing the switch Sk, the switch operation becomes effective. The switch Sk is also a non-locking type push-type normally open switch.

Further, the ROM (52) is added with routines (70) and (80) of the flowcharts shown in FIGS. 2 and 3, for example, and the following processes are performed by these routines (70) and (80). Done.

That is, the flags FLGA, FLGB, FLGC corresponding to the switches Ba to Bc are set in the RAM (53). This flag FLGA ~
FLGC defines whether or not to skip the corresponding band at the time of scanning, and skips when "0".
When "1", it is not skipped.

Then, when the switch Sk is pressed, the routine (70) starts from step (71), first, the outputs of the switches Ba to Bc are taken in at step (72), and then the switches Ba to Bc at step (73). Based on the output of Bc, it is checked whether or not the switches Ba to Bc have been pressed, and if none of them has been pressed, the process proceeds to step (75) to end this routine (75).

However, if any of the switches Ba to Bc is pressed, the process proceeds to step (74) and this step (7
Step (72) among flags FLGA to FLGC in 4)
Only the flag corresponding to the switch that was pressed in is inverted (when it is "0", it is set to "1", and when it is "1", it is set to "0"), and then in step (75), this routine (70)
Ends.

Therefore, according to this routine (70), if one of the switches Ba to Bc is pressed while pressing the switch Sk, the flag
The corresponding flag of FLGA to FLGC will be inverted.

On the other hand, when the switch Ss is pressed, the routine (80) starts from step (81), the loop counter i is set to "1" in step (82), and then the process proceeds to step (83). In step (83), band data BAND (data BAND of address B _{1 in} this case) is taken out from address Bi of memory (59), and in step (84), this data BAND is AM band, air band and FM.
It is checked which of the bands it represents.

Then, in the AM band, the process proceeds to step (85), the flag FLGA is checked in this step (85), and when FLGA = "0", the process proceeds to step (91) and FLGA = "1". Sometimes the process proceeds to step (93).

When the data BAND is the air band in step (84), the process proceeds from step (84) to step (8).
6), the flag FLGB is checked in this step (86), the process proceeds to step (91) when FLGB = "0", the process proceeds to step (93) when FLGB = "1", and , Data in step (84)
When the BAND is in the FM band, the process proceeds from step (84) to step (87), the flag FLGC is checked in this step (87), and when FLGC = "0", the process proceeds to step (91) and FLGB When = "1", the process proceeds to step (93).

Then, in step (91), the Fi of the memory (59)
Frequency data from address FREQ (in this case, data of address F ₁
FREQ) is taken out, and then the process proceeds to step (92) in which the frequency indicated by the band data BAND of step (83) and the frequency data FREQ of step (91) becomes the reception frequency. When the broadcast is not being performed based on the output of the detection circuit (25) or (36), the process immediately proceeds to step (93), and when the broadcast is being performed, the reception frequency is maintained for 5 seconds, and the reception frequency is maintained for 5 seconds. If switch Ss is not pressed in step (93)
Proceed to.

Further, in step (93), the counter i is incremented by "1" (in this case, i = 2).
The process proceeds to step (94), the size of the counter i is checked in this step (94), the process returns to step (83) when i ≦ 32, and the process returns to step (82) when i> 32. Return.

Therefore, if the switch Ss is pressed once, steps (83)-
(94) is repeated, and the counter i is incremented by "1" at this time, so Bi, F of the memory (59) is increased.
The frequency preset at the address i is scanned in sequence. Then, when the last frequency preset in addresses B ₃₂ and F ₃₂ of the memory (59) is scanned, the scanning is performed again from the first frequency in step (82).

Then, during this scan, the flag is set by the routine (70).
If any of FLGA to FLGC is set to "1", steps (85) to (87) skip steps (91) and (92), so the band corresponding to the set flag Is skipped. That is,
Of AM band, air band, and FM band, only the band for which the corresponding flag is reset is scanned.

If the switch Ss is pressed again while the reception frequency is maintained for 5 seconds in step (92), the routine exits this routine (80) and no further scanning is performed, and reception at that reception frequency is maintained. It

Thus, according to the present invention, even if a large number of frequencies are preset, only the necessary reception band is scanned, so that the target frequency can be received in a short time.

Also, for example, if switches S _{1 to} S ₃₂ are divided into groups and scanning is skipped for each group, the switches are switched.
Although the frequencies that can be preset to S _{1 to} S ₃₂ are limited, according to the present invention, the scans are skipped for each reception band, so that the switches S _{1 to} S ₃₂ can be freely preset.

In the above description, the scanning of the corresponding receiving band is skipped by the switches Ba to Bc, but it is also possible to scan only the corresponding receiving band.

〔The invention's effect〕

According to the present invention, even if a large number of frequencies are preset, only the necessary reception band is scanned, so that the target frequency can be received in a short time.

Also, for example, if switches S _{1 to} S ₃₂ are divided into groups and scanning is skipped for each group, the switches are switched.
Although the frequencies that can be preset to S _{1 to} S ₃₂ are limited, according to the present invention, the scans are skipped for each reception band, so that the switches S _{1 to} S ₃₂ can be freely preset.

[Brief description of drawings]

FIG. 1 is a system diagram of an example of the present invention, and FIGS. 2 and 3 are diagrams for explaining the same. (10) and (30) are receiver circuits.

Claims (1)

[Claims] 1. Data having a plurality of reception frequencies can be preset in a preset memory having a plurality of reception bands, and the preset reception frequencies can be obtained by sequentially extracting the preset reception frequency data. In a radio receiver configured to scan, the memory that presets reception band data belonging to a plurality of reception frequencies, a band and a skip switch for selecting and skipping reception bands belonging to the plurality of reception frequencies, and When scanning the preset reception frequency, the control unit for extracting the data of the reception band and checking whether the extracted data corresponds to the reception band designated by the band and the skip switch is provided. , Check by the above control means is specified A radio receiver configured to skip or scan the scan in units of the reception band designated by the band and the skip switch by controlling reception by the data of the reception frequency when the reception band is satisfied.