JPH0262060B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention provides a plurality of electronically tuned tuners capable of receiving the same band such as FM broadcast (or AM broadcast) in one cabinet, and a plurality of electronically tuned tuners capable of receiving the same band such as FM broadcast (or AM broadcast). The present invention relates to a radio receiving device that can receive broadcast stations simultaneously or selectively.

<Background technology> For example, radio receivers currently on the market include:
When you are receiving a certain FM broadcast station, and you want to listen to what is being broadcast on another FM broadcast station, you may have to turn off the reception of the specified station once. It is necessary to release the tuner and perform a tuning operation to another broadcast station, and if another broadcast station is received but it is not the desired broadcast and you want to return to the original specific broadcast station, you need to perform a tuning operation again. However, the operation is complicated and inconvenient.

<Object of the present invention> The present invention was invented in view of the above-mentioned drawbacks of the conventional radio receiver, and it provides a plurality of electronically tuned tuners capable of receiving the same band in one cabinet, and adjusts the frequency according to the usage situation. The present invention attempts to solve the above-mentioned drawbacks of the conventional apparatus by making it possible to receive a plurality of broadcast stations simultaneously or selectively.

<Embodiment of the present invention> Configuration: An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a block electric circuit diagram showing an embodiment of the radio receiving device according to the present invention.As is clear from this diagram, the radio receiving device of the present invention generally consists of the first and second FM radio receivers. second tuner part A,
B, a microcomputer C common to both tuner sections, a keyboard D, a switch circuit E, a power amplifier circuit F, an alarm signal generator G, and left and right speakers HL and HR.

The first tuner section A is well known and includes a first antenna 1A, a first electronic tuning unit 2A forming a so-called front end, and a first PLL controlled by a microcomputer C.
Circuit 3A and a first intermediate frequency amplifier circuit including a signal meter circuit (hereinafter referred to as the first IF amplifier)
4A, an FM demodulation circuit 5A including a center meter circuit, and a first autostop circuit 6A that outputs an autostop signal when a tuning signal (zero point of S-shaped characteristic) is obtained from the center meter circuit.
and a first muting switch 7A.

The second tuner section B is the first tuner section A.
Since the circuit configuration is exactly the same as that of the first tuner section A, the explanation thereof will be omitted, but the term "second" has been added to each component, and the reference numerals have been made to correspond to each component of the first tuner section A. "B" is attached.

The keyboard D also has a first keyboard that commands the sweep (search) of the first and second tuner sections A and B.
and the first search keys SK ₁ and SK _2. When operated when a desired broadcast station comes during sweeping, the sweeping operation is stopped and the tuned frequency information (preset data) at that time is stored in the memory of microcomputer C. the first and second reception keys JK ₁ and JK ₂ to cause the sweep operation to stop, and the re-search key WK to cause the tuner section that has stopped sweeping to perform the sweep operation again when operated after the sweep operation has stopped.
and a monitor release key EK.

Further, the switch circuit E is composed of an electronic switch, and is located between the FM demodulation circuits 5A, 5B and the power amplifier circuit F, and selectively switches the first and second tuner sections A, B in the stereo reception state. It consists of tuner changeover switches S ₁ and S ₂ for switching _, and monaural switches M ₁ and M ₂ for setting the first and second tuner sections A _and B to monaural reception state. Left and right contacts of tuner part
It is configured to switch between L ₁ and L ₂ and R ₁ and R ₂ .

Finally, there is the microcomputer C, which consists of a central processing unit (CPU) 8,
It is composed of a read-only memory (ROM) 9, a random access memory (RAM) 10, and input/output ports 11 and 12, and performs related operations with the tuner sections A and B, the keyboard D, and the switch circuit E. It includes the functional means shown in FIG. 2 for implementation. In Figure 2, the parts surrounded by thick solid lines are the first and second parts shown in Figure 1 above.
First and second IF amplifiers 4 of PLL circuits 3A and 3B
First and second signal meter circuits 4 included in A
A', 4B', first and second FM demodulation circuits 5A, 5B
The first and second center meter circuits 5 included in the
A', 5B', first and second auto-stop circuits 6
A, 6B, first and second muting switches 7A, 7B, and a switch circuit E are shown.

Functional means of the microcomputer C related to each of these components include a key discrimination/storage means 13 for discriminating and storing various key signals from the keyboard D, and the means 13 and first and second auto-stop circuits. 6A, 6B, the first and second weak electric field detection means 1a, 1b, and the comparison means 18 according to various command signals.
The first and second muting operations are performed in accordance with command signals from the PLL driving means 14 that controls the driving of the PLL circuits 3A and 3B, the key discrimination/storage means 13, and the first and second auto-stop circuits 6A and 6B. Muting control means 15 controls on/off of switches 7A and 7B, and corresponding first and second
The local oscillation frequency output from the PLL circuits 3A and 3B or the division ratio of the programmable frequency divider (1/
When the auto-stop signal is obtained from the first and second auto-stop circuits 6A and 6B by importing preset data such as N), the first and second memory means 16a store the data at that time as memory preset data. and 16b, and the first
and memory confirmation means 17 for confirming whether broadcast station data is stored in the second memory means 16a and 16b and outputting a confirmation signal, the key discrimination/storage means 13, and first and second auto-stop circuits. Then, in accordance with the commands of the memory confirmation means 17, the preset data that is being swept every moment is compared with the stored preset data stored in the first memory means 16a or the second memory means 16b, and both data are compared. the above-mentioned comparison means 18 which outputs a sweep interruption signal only when the keys are different; the above-mentioned key discrimination/storage means 13; and the memory confirmation means 17.
and a switch control means 19 which executes switching of the switch circuit E according to the commands of the comparison means 18, and outputs of the first and second signal meter circuits 4A' and 4B' to check whether the received radio waves are at a predetermined level. The first and second weak field detection means 20a, 2 output a weak electric field detection signal when the electric field falls below the level.
0b, and an alarm control means 21 which outputs an alarm drive signal when a weak electric field detection signal is obtained from these means 20a and 20b.

Operation: The present invention is constructed as described above, and its operation will now be explained according to the flowcharts of FIGS. 3 to 5.

The flowchart in FIG. 3 shows that from the initial state when the power switch (not shown) is turned on, in which neither the first nor second tuner sections A or B is in the tuning operation, the first tuner section Operate A to get the first
This shows a case where a specific broadcasting station is listened to in tuner section A of .

Therefore, when the first search key SK ₁ on the keyboard D is turned on from the initial state of the step (step), the key determination/storage means 13 determines that the search key SK ₁ is turned on and Memorize, and first, memory confirmation method 1
7 to execute a checking operation to determine whether or not there is already stored broadcast station data in the second memory means 16b corresponding to the second tuner section B (step).

Here, as described above, since no broadcasting station data is stored in the second memory means 16b in the initial state, the determination is NO and the process proceeds to the next step.

That is, the memory confirmation means 17 does not output a confirmation signal, and the PLL drive means 14 outputs a PLL drive signal (programmable After that, the muting control means 15 turns on the first muting switch 7A to supply the clock signal to the counter that changes the frequency division ratio of the frequency divider. While mutating is applied, the first memory means 16a assumes a write state of preset data (dividing ratio 1/N of the programmable frequency divider) obtained from the first PLL circuit 3A, and furthermore, the switch control means 19 The tuner changeover switches S ₁ and S ₂ of the switch circuit E are turned on to the contacts L ₁ and R ₁ , that is, the first tuner section A side, to enter the first tuner section auto search mode (step).

In this auto search mode, as the frequency division ratio of the programmable frequency divider in the first PLL circuit 3A changes every moment, the local oscillation frequency supplied to the mixer in the first electronic tuning unit 2A changes. Auto search is executed, and during this time, the PLL drive means 14 detects the first center meter circuit 5A' and the first signal meter circuit 4 via the first auto stop circuit 6A and the first weak electric field detection means 20a.
The output of A' is judged and the tuning point is searched (step).

As a result of such auto-search, it is said that the tuning point has been obtained in the first center meter circuit 5A', so the first auto-stop circuit 6
An auto-stop signal is output from A, and if the first weak electric field detection means 20a does not output a weak electric field detection signal at this time, the PLL driving means 14 determines that the radio waves of the specific broadcasting station have been received and starts PLL driving. The signal is stopped (step), and the first memory means 16a stores the first PLL circuit 3A at that time.
The preset data obtained is stored in a predetermined storage means as stored preset data (step). With this, the auto search by the first tuner section A is completed, and the process then proceeds to step where the muting control means 15 turns off the first muting switch 7A in accordance with the auto-stop signal, and the muting control means 15 turns off the first muting switch 7A, Cancel muting.

As the muting is canceled, the left and right signals of the broadcasting station received from the first FM demodulation circuit 5A are supplied to the power amplifier circuit F through the tuner changeover switches S ₁ and S ₂ , and are output in stereo from both speakers HL and HR. Broadcast (step).

This completes the reception of the specific broadcast station by the auto search of the first tuner section A. In this way, as the first tuner section A is driven, the above-mentioned specific broadcast station can be received in stereo broadcast. When you are
A listener may wish to monitor another broadcast station, and in this case, the microcomputer C will execute the program in the flowchart of FIG. 4 after the last step in FIG.

That is, when the second search key SK ₂ corresponding to the second tuner section B is turned on while a specific broadcasting station is being received through the first tuner section A as described above (see step), the key identification and Storage means 1
3, a signal indicating that the second search key SK ₂ has been turned on is sent to the memory confirmation means 17 and the comparison means 1.
8, and accordingly the memory verification means 1
7, it is confirmed whether or not the stored preset data is stored in the first memory means 16a (step).

As mentioned above, since the specific broadcast station is received by the first tuner section A and the stored preset data is stored in the first memory means 16a, a YES judgment is made in the step, and the memory is stored in the memory. The confirmation means 17 outputs a confirmation signal to the comparison means 18.

In accordance with this confirmation signal, the comparison means 18 reads the stored preset data of the specific broadcasting station from the first memory means 16a based on the key signal from the key discrimination/storage means 13, and compares the preset data with the second preset data.
It stands by in a state where it can compare with new broadcast station data sent from the PLL circuit 3B (step).

On the other hand, the key discrimination/storage means 13
At the same time as the search key SK ₂ is turned on, the second memory means 16b is set to the writing state, and the second
The supply of the PLL drive signal to the PLL circuit 3B is started (step).

With the above, the auto search by the second tuner section B of the step has been started, and the second PLL
As the frequency division ratio of the programmable frequency divider in the circuit 3B changes moment by moment, the local oscillation frequency supplied to the mixer in the second electronic unit 2B changes and auto search is executed, and during this time, the PLL driving means 14 is connected to the second center meter circuit 5B' and the second signal meter circuit 4 via the second auto-stop circuit 6B and the second weak electric field detection means 20b.
The output of B' is judged and the tuning point is searched (step, ).

Also, during the auto search by the second tuner section B, the key discrimination/storage means 13
It is determined that the second search key SK ₂ is on during reception by the first tuner section A when the search key SK ₁ is on (memorized), and the muting control means 15 is activated to The first muting switch 7A is turned off and the second muting switch 7B is turned on, that is, only the second tuner section B is muted, and
The switch control means 19 is the key discrimination/storage means 13
Based on the signal from the first tuner section A, the switch circuit E is kept in the stereo reception state by the first tuner section A.

Therefore, the broadcast of the specific broadcast station received by the first tuner section A is emitted from the speakers HL and HR despite the automatic search by the second tuner section B.

Also, during this time, the comparison 18 compares the stored preset data (data such as frequency regarding the specific broadcasting station currently being received by the first tuner section) stored in the first memory means 16a with the second preset data stored in the first memory means 16a.
A comparison with preset data sent from the PLL circuit 3B is executed.

As a result of the auto-search of the second tuner section B, a tuning point is obtained in the second center meter circuit 5B', and an auto-stop signal is output from the second auto-stop circuit 6B. At this time, the second weak electric field detection means 2
If 0b does not output a weak electric field detection signal, the PLL
The driving means 14 determines that the radio waves of the specific broadcasting station can be received in the second tuner section B, and starts the second tuner section B.
Stop the PLL drive signal to the PLL circuit 3B (step).

Further, following this step, the comparison means 18 determines whether the preset data from the second PLL circuit 3B at that time is different from the stored preset data stored in the first memory means 16a. (step), NO if both data are the same
With this judgment, the program returns to the second tuner section auto search program in the step.

That is, from the comparing means 18, the PLL driving means 1
4, a re-sweep command is issued, and the PLL drive means 14 supplies the PLL drive signal to the second PLL circuit 3B again to restart the auto search of the second tuner section B (step).

Further, if it is determined in the above step that the two data are different, the comparison means 18 determines YES and proceeds to step.

That is, the comparison means 18 sends a sweep interruption signal to the switch control means 1 based on the fact that both data match.
9 and causes the switch control means 19 to execute the switching operation of the switch circuit E.

In short, as shown in step 1, the tuner changeover switch for one channel of switch circuit E is
Switch only S ₂ to contact R ₂ and turn on both monaural switches M ₁ and M ₂ .

The sweep interruption signal is also supplied to the mutating control means 15, causing the means 15 to control the second
The mutating switch 7B is also turned off (step). Therefore, from speaker HL, the first
The broadcast being received by the second tuner part A can be heard in monaural from the speaker HR, and the broadcast being received by the second tuner part B can be heard by the listener. It is determined whether or not the broadcast is desired by the user (Step 〓〓).

If the listener turns on the re-search key WK on the keyboard D (step 〓〓) after determining that the desired broadcast is not the desired broadcast and turns on the monitor release key at step Change the tuner changeover switch S ₂ to the original contact
_R1 and operates the switch control means 19 so that the left and right signals of the first tuner section A are supplied to both speakers HL and HR (step 〓〓), and
The process returns to step in order to auto-search the second tuner section B again. Furthermore, when the monitor release key EK is turned on at step 〓〓', the second mutating switch 7B is turned on at step 〓〓'.
Returning to the step in FIG. 3, the process returns to stereo reception by the first tuner section A.

Also, if the listener desires the broadcast being received by the second tuner section B, the listener proceeds from step 〓〓 to 〓〓, and presses the second reception key by the listener.
Wait for JK ₂ to operate, and when the key JK ₂ is turned on,
The key discrimination/storage means 13 sends a signal reporting that the second receiving key JK ₂ has been turned on to the switch control means 19, which causes the switch control means 19 to switch the tuner changeover switches S ₁ and S ₂ of the switch circuit E. The contacts L ₂ , R ₂
side, that is, to the second tuner section B side (Step 〓〓).

At the same time, in accordance with the command from the key discrimination/storage means 13, the second memory means 16b stores the preset data output from the second PLL circuit 3B at that time as stored preset data (step 〓〓) Also, the muting control means 15 turns on the first muting switch 7A to apply muting to the first tuner section A (step).

As described above, the state of stereo reception by the first tuner section A has been switched to the state of stereo reception by the second tuner section B, so that the broadcast sound of another specific broadcast station being received by the second tuner section B is both speakers
Output from HL and HR (step).

As described above, the first tuner section A can automatically search to receive a specific broadcast station from the initial state (step), and the second tuner section Although the switching to the reception of a new specific broadcasting station by part B was successfully executed, in the initial state, even if you start from the auto search of the second tuner part B, the exact same program will be executed. Needless to say.

Next, a case in which a weak electric field is detected during reception will be described with reference to FIG.

Now, in the case where the second tuner part B is currently receiving another broadcast station as described above (step), if the radio waves weaken due to moving away from the broadcast station, the radio waves will start to change from step to step. The program advances to step and detects a weak electric field.

That is, when the second weak electric field detection means 20b detects that the electric field has become weak from the output obtained from the second signal meter circuit 4B', the second weak electric field detection means 20b outputs a weak electric field detection signal. (Step 〓〓) Based on this, the alarm control means 21 first sends the alarm drive signal to the alarm signal generator G.
, the generator G generates an alarm signal, and the power amplifier circuit F outputs an alarm sound from the speakers HL and HR (step 〓〓).

At the same time, the weak electric field detection signal is also given to the key discrimination/storage means 13 with the same content as when the first search key _SK1 is turned on.

Therefore, the key discrimination/storage means 13 supplies the same signal as the key signal indicating that the first search key SK ₁ is turned on based on the input of the weak electric field detection signal to the memory confirmation means 17 and the comparison means 18. Then, the memory checking means 17 is caused to check whether or not the stored preset data is stored in the second memory means 16b (Step <>).

As mentioned above, since the new specified broadcasting station is received by the second tuner section B and its memory preset data is stored in the second memory means 16b, a YES determination is made in step 〓〓. , the memory confirmation means 17 outputs a confirmation signal to the comparison means 18.

In accordance with this confirmation signal, the comparison means 18 reads out the stored preset data of the new specific broadcasting station from the second memory means 16b based on the key signal from the key discrimination/storage means 13, and A standby state is established in which the specific preset data and new preset data sent from the first PLL circuit 3A can be compared (step 〓〓).

On the other hand, the key discrimination/storage means 13 sets the first memory means 16 to the write state at the same time as the weak electric field detection signal is input, and starts supplying the PLL drive signal to the first PLL circuit 3A (step 1). ).

As described above, the auto search by the first tuner section A in the step 〓 based on the weak electric field detection in the first tuner section B has been started, and the programmable frequency divider in the first PLL circuit 3A has started. The local oscillation frequency supplied to the mixer in the first electronic unit 2A changes as the frequency division ratio of
The tuning point is searched by determining the outputs of the first center meter circuit 5A' and the first signal meter circuit 4A' via the first auto-stop circuit 6A and the second weak electric field detection means 20a (step 1). 〓、〓〓).

Also, during the auto search by the first tuner section A, the key discrimination/storage means 13
When the search key SK ₂ is turned on (memorized), it is determined that the auto search is being performed by the first tuner unit while the second tuner unit B is receiving the signal.
The muting control means 15 turns off the second muting switch 7B and turns on the first muting switch 7A, that is, mutating only the first tuner section A, and the switch control means 19 keeps the switch circuit E in the stereo reception state by the second tuner section B based on the signal from the key discrimination/storage means 13.

Therefore, the speakers HL and HR do not broadcast other broadcast stations received by the second tuner section B even though the electric field is weak and even though the first tuner section A is performing an auto search. ing.

During this time, the comparison means 18 compares the stored preset data (data such as frequency regarding the specific broadcasting station currently being received by the first tuner section) stored in the second memory means 16b with the first
A comparison with preset data sent from the PLL circuit 3A is executed.

As a result of the auto-search of the first tuner section A, the tuning point is obtained in the first center meter circuit 5A', and an auto-stop signal is output from the first auto-stop circuit 6A. At this time, the first weak electric field detection means 2
20a is not outputting the weak electric field detection signal.
The PLL driving means 14 determines that the radio waves of the specific broadcasting station can be received in the first tuner section A, and then
The PLL drive signal to the PLL circuit 3A is stopped (step 〓).

Further, following this step, the comparison means 18 determines whether the preset data from the first PLL circuit 3A at that time is different from the stored preset data stored in the second memory means 16b. (Step 〓), if both data are the same, NO
After determining this, the program returns to the first tuner section auto search program in step 〓〓.

That is, from the comparing means 18, the PLL driving means 1
4, a re-sweep command is issued, and the PLL drive means 14 supplies the PLL drive signal to the first PLL circuit 3A again to restart the auto search of the first tuner section A (step 〓〓).

Further, if it is determined in step << that the two data are different, the comparing means 18 judges YES and proceeds to step <>.

That is, the comparison means 18 sends a sweep interruption signal to the switch control means 1 based on the fact that both data match.
9 and causes the switch control means 19 to execute the switching operation of the switch circuit E.

In short, as shown in steps 〓〓〓〓〓〓
Switch only S ₁ to contact L ₁ and turn on both monaural switches M ₁ and M ₂ .

The sweep interruption signal is also supplied to the mutating control means 15, causing the means 15 to control the first
Also turn off muting switch 7A (Step 〓〓). Therefore, from speaker HL, the first
Listeners can hear the broadcasts being received by the second tuner section A in monaural, and the broadcasts being received by the second tuner section B from the speaker HR, and the broadcasts being received by the first tuner section. The system waits for a decision as to whether or not it is the desired broadcast (step 〓〓).

If the listener turns on the re-search key WK on the keyboard D because the broadcast is not what he or she wants (Step 〓〓), the key discrimination/storage means 13 returns the tuner changeover switch _S1 of the switch circuit E to the original contact point. The switch control means 19 is operated so that the left and right signals of the _second tuner section B are supplied to both speakers HL and HR (step 〓), and the first tuner section B is automatically searched again. Return to step 〓〓 to do so.

Also, if the listener desires the broadcast being received by the first tuner section A, the program proceeds from step 〓〓 to step 〓 and waits for the listener to operate the first reception key JK ₁ . When the key JK ₁ is turned on, the key discrimination/storage means 13 sends a signal to the switch control means 19 notifying that the first reception key JK ₁ is turned on, and causes the means 19 to turn on the switch. Switch the tuner changeover switches S ₁ and S ₂ of circuit E to the contacts L ₁ and R ₁ side, that is, to the first tuner section side (Step 〓〓).

At the same time, in accordance with the command from the key discrimination/storage means 13, the first memory means 16a stores the preset data output from the first PLL circuit 3A at that time as stored preset data (step Also, the muting control means 15 turns on the second muting switch 7B to apply muting to the second tuner section A (step 〓〓).

As described above, the state of stereo reception by the second tuner part B due to the weak electric field has been switched to the stereo reception state by the first tuner part A, and therefore the broadcasting of the broadcast station selected by the first tuner part A has been performed. can be heard from both speakers HL and HR. (Step〓).

<Effects of the present invention> Since the present invention is configured as described above, it is possible to receive stereo broadcasts separately in the two tuner sections, or broadcast stations received in both tuner sections simultaneously in monaural. This is an excellent invention that allows you to monitor other broadcast stations.

[Brief explanation of the drawing]

FIG. 1 is a block electrical circuit diagram showing an embodiment of the radio receiving device according to the present invention, FIG. 2 is a block diagram showing the relationship between the function realizing means of the microcomputer and peripheral circuitry in the same device, and FIG. 3 5 to 5 are flowcharts for explaining the operation of the above device. A, B: first (second) tuner section, E: switch circuit, HL, HR: speaker, 19: switch control means.

Claims (1)

[Claims] 1. The first channel can receive stereo broadcasts independently.
and a second tuner unit, left and right speakers provided in common to both tuner units, and reception by either of the first and second tuner units provided between the tuner units and the speakers. a switch circuit that takes a stereo state in which the left and right signals of the stereo broadcast received by the tuner sections are individually given to the left and right speakers; When only one of the two tuner sections is receiving a stereo broadcast, the switch circuit is set to the stereo state, and when the other of the two tuner sections is receiving a broadcast station in the stereo state, the switch circuit is set to the monaural state. A radio receiving device comprising a switch control means for switching the state.