JPS6115424A - Radio receiver - Google Patents

Abstract

PURPOSE:To receive simultaneously or selectively plural broadcast stations in response to the operating state by providing plural electronic tuners receiving the same band. CONSTITUTION:In receiving a stereo broadcast station through the 1st tuner A, when a search key of the 2nd tuner B is turned on, the automatic aerch by the tuner B is started. When the tuning is detected, a control section C turns off a muting switch 7B and the broadcast received by the 1st tuner A is listened to from a speaker HL and the broadcast received by the 2nd tuner B is listened to from a speaker HR respectively monaurally. If the broadcast is not a broadcast desired by a listener, the search key is turned on again. Then the tuner B performs the automatic search again. Moreover, in turning on a release key, the switch 7B is turned on and the circuit restores to the stereo reception by the tuner A.

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention provides a single cabinet with a plurality of electronically tuned tuners that can independently receive the same band such as FM broadcasting (or AM broadcasting). The present invention relates to a radio receiving device that can simultaneously or selectively receive a plurality of broadcast stations as required.

<Background technology> For example, when radio receivers currently on the market are receiving a specific FM broadcast station, they cannot listen to what kind of broadcasts are being broadcast on other FM broadcast stations. Even if you want to do so, you will have to cancel reception of the specific broadcasting station mentioned above and then perform the tuning operation to another broadcasting station. When the user wants to return to the same broadcasting station, it is necessary to perform the tuning operation again, which 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 provides a plurality of electronically tuned tuners that can receive 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 simultaneously or selectively receive a plurality of broadcast stations.

<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 electrical circuit diagram showing one 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 is roughly a first embodiment of the FM radio receiving device.
and a second tuner section A.

B, microcomputer C common to both tuner sections, keyboard D, switch circuit E, and power amplifier circuit F.
, alarm signal generator G and left and right speakers HL, HR
It consists of

The first tuner section A is a well-known one, and the first tuner section A is a well-known one.
an antenna IA, a first electronic tuning unit 1-2A forming a so-called front end, a first PLL circuit 3A controlled by a microcomputer C, and a first intermediate frequency amplification circuit including a signal meter circuit. (Hereinafter, the first I
(referred to as F amplifier) 4A and F including center meter circuit
It consists of an M demodulation circuit 5A, a first auto-stop circuit 6A that outputs an auto-stop signal when a tuning signal (zero point of figure 8 characteristic) is obtained from the center meter circuit, and a first muting switch 7A. .

The second tuner section B has exactly the same circuit configuration as the first tuner section A, so a description thereof will be omitted, but each component will be labeled with the word "second" and the reference numerals will be replaced with the term "second". Each component of the first tuner section A is designated by rBJ corresponding to each component.

Further, the keyboard D has first and second search keys SK, SK2 for instructing a sweep (search) of the first and second tuner sections A and B, and a desired broadcasting station comes during the sweep. When operated, the sweep operation is stopped and the tuning frequency information (preset data) at that time is sent to the microcomputer C.
The first . second reception key JK+,
JK2 and a re-search key WK that, when operated after the sweep operation has stopped, causes the tuner unit that has stopped sweeping to perform the sweep operation again.
and a monitor release key EK.

The switch circuit E is an electronic switch, and is located between the FM demodulation circuits 5A and 5B and the power amplifier circuit F, and selectively switches the first and second tuner sections A and B in the stereo reception state. Tuner changeover switch! l
+, S2 and 1st. Monaural switch M 1 + M for setting the second tuner sections A and B to monaural reception state
In particular, the tuner changeover switch SI+52 consists of left and right contacts L1.2 of each tuner section. L2. It is configured to switch R, , R2.

And finally, the above microcomputer C,
This is the central processing circuit (CPU) 8.

Read-only memory (ROM) 9, random access memory (RAM) 10, and input/output ports 11.1
2, and includes functional means shown in FIG. 2 for performing operations related to the tuner sections A, B, keyboard D, and switch circuit E. In FIG. 2, the part surrounded by a thick solid line is the first section shown in FIG. 1 above.
The second PLL circuits 8A, 8B, the first . The first IF amplifier included in the second IF amplifier 4A. Second signal meter circuit 4
A', 4 B', 1st. second FM demodulation circuit 5A,
1st included in 5B. Second center meter circuit 5A'
.

5B, 1st. Second auto-stop circuits 6A, 6B, first . Second muting switches 7A, 7B and switch circuit E are shown.

Functional means of the electronic computer C related to each of these components include a key discrimination/storage means 18 for discriminating and storing various key signals from the keyboard D; First and second auto stop circuits 6A and 6B
, first and second weak electric field detection means 1a and lb, comparison means 1
According to various instructions from 8, the first and second P
A PLL driving means 14 for controlling the driving of the LL circuits 3A and 3B, and the key discrimination/storage means 13. 10. A muting control means 15 that controls on/off of the first and second muting switches 7A and 7B according to command signals from the second auto-stop circuits 6A and 6B, and commands for the key discrimination/storage means 13. The first corresponding according to
And the preset data such as the local oscillation frequency output from the second PLL circuits 8A and 3B or the division ratio (1/N) of the programmable frequency divider is taken in, and the first and second auto-stop circuits 6A , 6B, first and second memory means 1 store the preset data at that time as stored preset data.
6a and 16b, and a memory check for checking whether broadcasting station data is stored in the first and second memory means 16a and 16b and outputting a confirmation signal according to instructions from the key discrimination/storage means 13. means 17, and the key discrimination/storage means 13. Preset data that changes moment by moment during sweeping according to commands from the first and second auto-stop circuits and the memory confirmation means 17, and stored preset data stored in the first memory means 16a or the second memory means 16b. Comparing means 1 which outputs a sweep interruption signal only when both data are different.
8, and the key discrimination/storage means 13. A switch control means 19 for switching the switch circuit E according to commands from the memory confirmation means 17 and the comparison means 18, and the first and second signal meter circuits 4A' and 4.
The first and second weak electric field detection means 20a, 20b which check the output of B' and output a weak electric field detection signal when the received radio wave becomes below a predetermined level, and these means 20a,
The alarm control means 21 outputs an alarm drive signal when a weak electric field detection signal is obtained from the alarm control means 20b.

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

The flowchart in FIG. 3 shows the first and second tuner sections A.
, H. From the initial state when the power switch (not shown) is turned on and none of the tuner units of the tuners are in the tuning operation, operate the first tuner unit A to select a specific broadcasting station in the first tuner unit A. This shows the case where you are listening to the following.

Therefore, when the first search key SK in the keyboard D is turned on from the initial state of step ■ (step ■), the key discrimination/storage means 18 determines that this search key SK is turned on. This is stored, and first the memory checking means 17 executes a checking operation to check whether there is already stored broadcasting station data in the second memory means +6b corresponding to the second tuner section ( Step ■).

Here, as mentioned above, in the initial state, the second memory means 1
Since no broadcast station data is stored in 6b, the answer is NO, and the process proceeds to the next step (2).

That is, the memory confirmation means 17 does not output a confirmation signal, and the PLL drive means 14 operates the first PLL circuit 3A according to the first sweep command signal output from the key discrimination/storage means 13.
The muting control means 15 starts supplying a PLL drive signal (such as a clock signal to a counter that changes the division ratio of a programmable frequency divider), and subsequently turns on the first muting switch 7A. muting is applied to the first tuner section A, and the first memory means 16a writes preset data (dividing ratio 1/N of the programmable frequency divider) obtained from the first PLL circuit 8A. Furthermore, the switch control means 19 controls the tuner changeover switch SI+5 of the switch circuit E.
2 to the contacts LI+RI, that is, the first tuner section A side, to enter the first tuner section auto search mode (step 2).

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 1-2A changes. During this time, the PLL drive means 14 detects the first center meter circuit 5A' and the first signal meter circuit 4A' via the first auto stop circuit 6A and the first weak electric field detection means 20a. The output is judged and the tuning point is searched (steps ■, ■).

As a result of such an auto search, an auto stop signal is output from the first auto stop circuit 6A because the tuning point has been obtained in the first center meter circuit 5A'. Electric field detection means 2
If 0a is not outputting a weak electric field detection signal, the PLL driving means 14 determines that the radio waves of the specific broadcasting station have been received, and the PL
(step (2)) to stop the L drive signal, and the first memory means 16a stores the preset data obtained from the first PLL circuit 3A at that time in a predetermined storage stage;
The automatic search by the first tuner section A is now completed, and the process proceeds to step [phase] where the muting control means 15 performs the muting control according to the auto stop signal. The first muting switch 7A is turned off to release the muting of the first tuner section A.

According to this muting cancellation, the first FM demodulation circuit 5
The left and right signals of the broadcast station being received from A are supplied to the power amplifier circuit F through the tuner selector switch SI+'S2, and are broadcast in restereo from both speakers HL and HR (
Step O).

This completes the reception of the specific broadcasting station by the auto search of the first tuner unit A. In this way, the specific broadcasting station is received in stereo according to the drive of the first tuner unit A. In this case, the microcomputer C executes the program shown in the flowchart in Figure 4 after the last step ■ in Figure 3. I will do it.

That is, when the second search key SK2 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 discrimination/ The second search key S from the storage means 13
A signal 73S indicating that K2 is turned on is supplied to the memory checking means 17 and the comparing means 18, and in accordance with this, the memory checking means 17 determines whether or not the memory preset data is stored in the first memory means 16a. Confirm (step [phase]).

As mentioned above, since the specific broadcast station is received by the first tuner unit A and the stored preset data is stored in the first memory means 16a, a YES determination is made in step [phase]. , 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 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 data with the second PLL circuit. It stands by so that it can compare with the new broadcast station data sent from 8B (step ■).

On the other hand, the key discrimination/storage means 13 sets the second memory means 16b to the write state at the same time as the second search key SK2 is turned on, and starts supplying the PLL drive signal to the second PLL circuit 3B. (Step 0).

With the above, the auto search by the second tuner section B of step [phase] has started, and as the frequency division ratio of the programmable frequency divider in the second PLL circuit 3B changes every moment, the second The local oscillation frequency supplied to the mixer in the electronic unit 2B is changed and an auto search is performed, during which
The PLL driving means 14 is connected to the second center meter circuit 5B' and the second signal meter multicircuit 4 via the second auto-stop circuit 6B and the second weak electric field detection means 20b.
Judge the output of B' and search for the tuning point (step @
.

[phase]).

Also, during the auto search by the second tuner section B,
The key discrimination/storage means 13 is the first search key S.
The first tuner section A is turned on (memorized) when K is turned on (memorized).
When it is determined that the second search key SK2 is on during reception, the muting control means 15
The second muting switch 7B is turned on while the muting switch 7A is kept off, that is, only the second tuner section B is muted. The switch circuit E is kept in the stereo reception state by the first tuner section A based on the signal from the first tuner section A.

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

Also, during this time, the comparison means 18 compares the stored preset data (data such as the frequency regarding the specific broadcasting station currently being received by the first tuner section) stored in the first memory means 16a and the second 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, the tuning point is obtained in the second center meter circuit 5B', so the second auto stop circuit 6 is activated.
An auto stop signal is output from B, and at this time the second
If the weak electric field detecting means 20b does not output a 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 second tuner section B, and the second PL.
Stop the PLL drive signal to the L circuit 8B (step [
phase]).

Further, following this step [phase], the comparison means 18 determines whether the preset data from the second PLL circuit 8B at that time is different from the stored preset data stored in the first memory means 16a. If both data are the same, it is judged as NO and the process returns to the second tuner section auto search program in step [phase].

That is, the comparison means 18 issues a resweep command to the PLL drive means 14, and the PLL drive means 14
The circuit 3B is supplied with the PLL drive signal again to restart the auto search of the second tuner section B (step 2).

Further, if the two data are different in the judgment in the above step [phase], the comparison means 18 judges YES and performs step @).
Proceed to.

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

In short, as shown in steps [phase] and [phase], only the tuner selector switch S2 of one channel of the switch circuit E is switched to contact R2, and both monaural switches M+
Turn on +M2.

Further, the sweep interruption signal is transmitted to the muting control means 1.
5, the means 15 also turns off the second muting switch 7B (step [phase]). Therefore, the broadcast received by the first tuner section A from the speaker HL can be heard in monaural, and the broadcast received by the second tuner section B from the speaker HR can be heard in monaural. The system waits for a determination as to whether the broadcast being received is the broadcast desired by the listener (step [phase]).

If the broadcast is not what the listener wants, step Q.
When the re-search key WK in the keyboard D is turned on (step [phase]) after determining that the monitor release key is on, the key discrimination/storage means 13 returns the tuner selector switch S2 of the switch circuit E to the original contact R1. The switch control means 19 is operated so that the left and right signals of the first tuner section A are supplied to both speakers HL and HR (step o).
, and then returns to step [phase] in order to auto-search the second tuner section B again. Also, if the monitor release key EK is turned on in step O, the second
The muting switch 7B is turned on, and the process returns to step (3) in FIG. 3, and the process returns to stereo reception by the first tuner section A.

Further, if the listener desires the broadcast being received by the second tuner section B, the process proceeds from step [phase] to step [phase], and the listener presses the second reception key JK.
2, and when the key JK2 is turned on, the key discrimination/storage means 13 sends a signal to the switch control means 19 notifying that the second reception key JK2 has been turned on. and connect the tuner selector switch SI+82 of switch circuit E to contact L2. Switch to the R2 side, that is, to the second tuner section B side (step [phase]).

At the same time, the second memory means 16b stores the second P L in accordance with the command from the key discrimination/storage means 13.
Step [phase]) in which the preset data output from the L circuit 3B is stored as memory preset data;
Further, the muting control means 15 turns on the first muting switch 7A to apply muting to the first tuner section A (step [phase]).

In the 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, and the broadcast sound of another specific broadcast station being received by the second tuner section B. is output from both speakers HL and HR (
step [phase]).

As described above, the reception of a specific broadcasting station by the automatic search of the first tuner section A from the initial state (step 2) and the reception state of the specific broadcasting station by the tuner section A of the lt (step 2) are completed. Switching power to reception of a new, other specific broadcast station by tuner part B ≦Execution was possible, but 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, it will happen.

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

Now, when the second tuner unit B is currently receiving another broadcast station 2 as described above (step [phase]), if the radio waves become weaker due to moving away from the broadcast station, step After passing from ■ to ■, the program advances to step [phase] 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 [phase]), based on this,
First, the alarm control means 21 applies an alarm drive signal to the alarm signal generator G, causes the generator G to generate an alarm signal, causes the power amplifier circuit F to output 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 SKI is turned on.

Therefore, the key discrimination/storage means 13 supplies the same signal as the key signal indicating that the first search key SKI 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. [Phase]: The memory checking means 17 is caused to check whether or not the memory preset data is stored in the second memory means 16t+ (step 2).

As mentioned above, since the new specific broadcast station is received by the second tuner section B and its storage preset data is stored in the second memory means 16b, a YES decision is made in step (2). , 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 reads out the stored preset data of the new specific broadcasting station. and the new preset data sent from the first PLL circuit 3A are put on standby (step [phase]).

On the other hand, upon input of the weak electric field detection signal, the key discrimination/storage means 13 sets the first memory means 16 to the write state and starts supplying the PLL drive signal to the first PLL circuit 3A (step [ phase]).

With the above, the auto search by the first tuner part A in the step [phase] based on the weak electric field detection in the second tuner part B has been started, and the programmable frequency division in the first PLL circuit 3A has started. As the frequency division ratio of the mixer changes moment by moment, the local oscillation frequency supplied to the mixer in the first electronic unit 2A changes and an auto search is executed. During this time, the PLL drive means 14 operates the first auto stop circuit 6A and the second weak electric field detection means 20a, the outputs of the first center meter circuit 5A' and the first signal meter circuit 4A' are determined to search for a tuning point (step @).

@).

Also, during the auto search by the first tuner section A,
The key discrimination/storage means 13 is the second search key S.
Second tuner section B when K2 is turned on (memorized)
The muting control means 15 keeps the second muting switch 7B off and turns on the first muting switch 7A. In other words, muting is applied only to the first tuner section A,
Further, 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, from the speakers HL and HR, the second tuner section B
Other broadcast stations received by the tuner A are being broadcast even though the electric field is weak and the first tuner section A is in the process of auto-searching.

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, so the first auto stop circuit 6A is activated.
If the auto-stop signal is outputted and the first weak electric field detection means 20a is not outputting the weak electric field detection signal at this time, the PLL driving means 14
The tuner unit A determines that the radio waves of the specific broadcasting station have been received and stops the PLL drive signal to the first PLL circuit 3A (step @).

Further, following this step @, the comparison means 18 judges whether the preset data from the first PLL circuit 8A at that time is different from the stored preset data stored in the second memory means 16b. Step 0), N if both data are the same.

Then, the program returns to step [phase] of the first tuner section auto search program.

That is, the comparison means 18 issues a resweep command to the P-LL drive means 14, and the PLL drive means 14
The L circuit 3'A is supplied with the PLL drive signal again to restart the auto search of the first tuner section A (step [
phase]).

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

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

In short, as shown in step [phase], @, only the tuner changeover switch Sl of one channel of the switch circuit E is switched to the contact Ll, and both monaural switches are switched.
+ Turn on M2.

Further, the sweep interruption signal is transmitted to the muting control means 1.
5 is also supplied, and the means 15 also turns off the first mining switch 7A (step @). Therefore, the broadcast received by the first tuner section A is received from the speaker HL, and the broadcast received by the second tuner section B is received from the speaker HR.
The broadcasts being received by the listener can be listened to in monaural respectively, and the listener waits for a judgment as to whether the broadcast being received by the first tuner is the broadcast desired by the listener (step @).

If the listener does not find the desired broadcast and turns on the re-search key WK on the keyboard D (step 50)
, the key discrimination/memory means 13 returns the tuner changeover switch SI of the switch circuit E to its original contact L2 and controls the switch so that the left and right signals from the second tuner section B are supplied to both speakers HL and HR. The means 19 is operated (step ■), and the process returns to step [phase] in order to auto-search the first tuner section B again.

Further, if the broadcast being received by the first tuner section A is desired by the listener, the program proceeds from step @ to step 0, waits for the listener to operate the first reception key JK+, and then performs the same operation. When the key JK+ is turned on, the key discrimination/storage means 13 sends a signal notifying that the first receiving key JK+ is turned on to the switch control means 19, and the means 19 controls the tuner of the switch circuit E. Changeover switch S
I+S2 is switched to the contact LI+R1 side, that is, to the first tuner section side (step O).

At the same time, the first memory means 16a determines the key and according to the command from the storage means 13, the first PLL at that time is stored.
The preset data outputted from the circuit 3A is stored as stored preset data (Step 2), and the muting control means 15 turns on the second muting switch 7B to apply muting to the second tuner section A ( Step O).

With the above, the second tuner part B due to the weak electric field
This means that the broadcasting of the broadcast station selected by the first tuner section A can be heard from both speakers HL and HR (step [phase] le). Effects of the present invention> Since the present invention is configured as described above, it is possible to listen to the broadcast of a specific broadcast station using one tuner section while monitoring the broadcast of another broadcast station using the other tuner section. This is an excellent invention that can provide a radio receiving device that is extremely convenient for listeners.

[Brief explanation of the drawing]

FIG. 1 is a block electric circuit diagram showing an embodiment of the radio receiving device according to the present invention, FIG. - FIG. 5 is a diagram showing a flowchart used to explain the operation of the above device. A@: First (second) tuner section. E: Switch circuit. HL (HR): Speaker.

Claims (1)

[Claims] 1. A plurality of common speakers are provided for a plurality of tuner sections each capable of independently receiving the same band, and only one of the tuner sections is connected to a plurality of the speakers between each tuner section and the above-mentioned speaker. and a state in which each of the tuner sections is independently connected to the corresponding speaker, and switch control means for selectively setting the switch circuit to both of the above states. Radio receiver machine.