JPS62301Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to an audio multiplex signal receiving device. The audio multiplex signal receiving device to which the present invention is applied is a device configured primarily for listening to dual audio broadcasts, and is configured to receive audio multiplex signals from a main audio output and a sub audio output (hereinafter simply referred to as (referred to as L output and R output) are separated, and one is applied to the speaker and the other is applied to the earphone terminal. Hereinafter, the apparatus having the above configuration will be referred to as a dual audio receiving apparatus, to distinguish it from an audio multiplex signal receiving apparatus equipped with two speakers for stereo broadcast reproduction. As mentioned above, dual audio receiving devices generally include:
When receiving a dual audio signal, the speaker is selectively driven with an L output or an R output, and the earphone terminal is configured to allow the user to listen to the output of the channel opposite to that of the speaker. Accordingly, even when receiving stereo broadcasts, only the L output or R output can be heard through the speakers. In order to eliminate such unnaturalness when receiving stereo broadcasts in conventional devices, the inventor of the present invention previously filed an application as Utility Model Application No. 10087/1987, in which a matrix circuit and a speaker as well as a matrix circuit and an earphone terminal were proposed. A device has been proposed in which a switching element is provided between the receiver and the receiver, and the switching element is cut off when receiving a stereo broadcast, and at the same time a main channel signal is applied to the speaker and earphone terminal via another switching element. In such a device, when receiving a double audio signal, the main signal is given to the L output recording terminal and the sub signal is given to the R output recording terminal, or vice versa, the sub signals are given to the L and R output recording terminals respectively. It is limited to the receiving state of either giving the signal or the main signal. Also, as a program changeover switch, for example 4
A pole single-throw switch is used, and four types of program selection signals are given to the matrix control circuit connected to it to select not only main/sub and sub/main combination programs, but also main/main/sub combination programs.・
Devices are known that allow selection of secondary programs as well. However, there are cases, such as small television receivers, where the panel area is small and it is not desirable to provide a large switch. The purpose of the present invention is to provide an L output signal and an R output signal to the L and R output recording terminals respectively when receiving a stereo broadcast, based on a signal indicating whether or not a dual audio broadcast is being received. When receiving audio signals, it is possible to give the main signal or sub signal to both the L and R output recording terminals, allowing audio multiplex signal reception, which is highly useful when receiving dual audio, such as when listening to broadcasts with a headphone. The goal is to provide equipment. The gist of the present invention is to receive a main channel signal and a sub-channel signal, separate the main audio output and sub-audio output from both signals, and output the audio output according to the control signal in the audio multiplex signal and the set position of the program changeover switch. It has a matrix circuit that outputs one of the outputs to a first output terminal and the other to a second output terminal, the first output terminal is connected to a speaker, and the second output terminal is connected to a speaker. In the audio multiplex signal receiving device connected to the earphone terminal, the main/sub selection is separated from the control signal and receives the dual audio detection signal output when receiving the dual audio broadcast and the both audio outputs. a first recording terminal connected to one of the first output terminal or the second output terminal, and a second recording terminal connected to the output side of the main-sub selection circuit. and the main-sub selection circuit provides the same audio output to the second recording terminal as the audio output applied to the first recording terminal while receiving the double audio detection signal. The feature is an audio multiplex signal receiving device. Hereinafter, the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a schematic block circuit diagram showing an embodiment according to the present invention. In the figure, a matrix circuit 9 receives a main channel signal and a sub-channel signal and separates them into a main audio output and a sub-audio output. In addition, the matrix control circuit 3
1 has a function of detecting that it is receiving a stereo signal and outputting it to the matrix circuit 9. Preferably, it receives a control signal included in the audio multiplexed signal and outputs it to the matrix circuit 9. A stereo signal detection circuit 41 and a dual audio signal detection circuit 42 are provided for determining whether the audio signal is a dual audio signal. It is connected to a program changeover switch 11 for the viewer to select a desired program.
This matrix control circuit 31 is connected to the matrix circuit 9, so that desired signals appear at the output terminals 21 and 22 of the matrix circuit 9 during dual audio broadcasting, and when the program changeover switch is pressed during stereo broadcasting. Regardless of the set position, the L output is at terminal 21, and the L output is at terminal 2.
2 is given the R output. The main channel signal is input to the matrix circuit 9 while being applied to the main channel signal switch circuit 32. When stereo broadcast reception is transmitted from the stereo signal detection circuit 41 to the main channel signal switch circuit 32, the switch circuit 33 outputs the output terminal 2 to the main channel signal switch circuit 32.
1 and 22 are then cut off, and the main channel signal is applied to the speaker 2 and earphone terminal 3. Next, the signals to the recording terminals 4 and 5, which is the main feature of the present invention, will be explained. The signal from the output terminal 21 of the matrix circuit 9 is applied to the L output recording terminal 4 and the main/sub selection circuit 43. On the other hand, the signal from the output terminal 22 is applied to the R output recording terminal 5 via the main/sub selection circuit 43. Further, a signal indicating reception of a dual audio signal is applied to the main/sub selection circuit 43 from the dual audio signal detection circuit 42 . When receiving stereo broadcasting, the L output appearing at the output terminal 21 is applied to the recording terminal 4, and the R output appearing at the output terminal 22 is applied to the main-sub selection circuit 4.
3 to the recording terminal 5, making stereo recording possible.
It is also possible to listen to stereo broadcasts using a headphone 44 connected in parallel to the stereo broadcast. Next, the reception of a double audio signal will be explained. First, assume that the listener operates the program changeover switch 11 so that the main signal appears at the output terminal 21. The main signal of this output terminal 21 is applied to the recording terminal 4. Further, although a sub-signal appears at the output terminal 22, this sub-signal is electrically cut off from the recording terminal 5 by the main-sub selection circuit 43. Instead of this sub signal, the main signal from the output terminal 21 is applied from the main/sub selection circuit 43 to the recording terminal 5. In this way, the main signal is applied to both recording terminals 4 and 5. Next, when the program changeover switch 11 is operated in the opposite direction to the above case when receiving the dual audio signal,
A sub-signal and a main signal appear at the output terminals 21, 22, respectively, and then the sub-signals are applied to the recording terminals 4, 5, as described above. In this embodiment, the connection relationship is as shown in the figure, and when receiving dual audio broadcasting, the recording terminals 4 and 5
The signal appearing on is the same as the signal applied to speaker 2. The present invention is not limited to this embodiment, but the signal applied to the earphone terminal 3 can also be applied to the recording terminals 4 and 5 when receiving a dual audio broadcast. That is, the terminal 22 and the terminal 5 may be connected, and the terminal 21 may be connected to the terminal 4 via the main-sub selection circuit 43. Next, further explanation will be given with reference to the embodiment shown in FIG. When the matrix control circuit 31 detects stereo broadcast reception based on the control signal, the transistor
When TR1 becomes conductive, the light emitting diode D5 indicating stereo broadcast reception lights up, and the base of the transistor TR2 is grounded via the transistor TR1, its potential decreases, and the transistor TR2 becomes conductive. Further, the main channel signal is applied to the base of the transistor TR2, and an L+R output appears from the collector of the transistor TR2, which is connected to the speaker 2 and earphone terminal 3 via diodes D3 and D4. At this time, since the diodes D1 and D2 are cut off, the L+R output is applied to the speaker 2 and earphone terminal 3. Transistor for non-stereo broadcasting
TR1 and TR2 are cut off, and diode D3
~D5 is cut off, diodes D1 and D2 are conductive, and the desired program signal determined by the set position of program changeover switch 11 and the control signal appears at output terminals 21, 22;
It can be heard through the speaker 2 and/or the earphone terminal 3. Note that D6 is a light emitting diode for displaying dual audio broadcast reception. Transistor TR3 receives at its base a signal indicating dual audio broadcast reception from matrix control circuit 31 and becomes conductive. At this time, the connection point between the diode D7 and the diode D8 is grounded via the resistor R1 and the transistor TR3, so the diode D7 is cut off and the diode D8 is turned on. Therefore, the main signal or sub-signal appearing at the output terminal 21 according to the changeover switch 11 is applied to the terminal 4, while being applied to the terminal 5 via the diode D8. Also, the sub signal or main signal appearing at the output terminal 22 is connected to the diode D.
7, the recording terminal 5 is cut off. The preferred embodiment device according to the present invention is built into a TV receiver, and the TV receiver includes:
It is equipped with one speaker and one earphone terminal, and when listening to dual audio broadcasts, the speaker and/or earphone terminal are used, and programs can be selected with a switch. Then, the stereo broadcast is automatically switched to L+R output and can be listened to through speakers and/or earphones. Note that it is also possible to listen to stereo broadcasts via two separate speakers via the output signal from the recording terminal. The outputs appearing at each output end according to the present invention are shown in the table below.

【table】

[Table] As described above, according to the present invention, the unnaturalness of listening to only the signal output of one channel during stereo broadcasting with conventional equipment can be resolved by simply adding a simple switch circuit. . Furthermore, when receiving a dual audio broadcast, it is possible to give the desired signal of the main signal and sub signal to both recording terminals, and use the recording terminal or a terminal provided in parallel to broadcast the dual audio broadcast on the headphone. You can listen to the desired program of
It is possible to improve the utilization of dual audio broadcasting. Further, it is possible to extract a signal different from the signal applied to the speaker terminal from the earphone terminal without impairing the above function.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram schematically showing an embodiment of the present invention. FIG. 2 is a detailed circuit diagram of an embodiment of the present invention. 2...Speaker, 3...Earphone terminal, 4,
5... Recording terminal, 9... Matrix circuit, 10
...Control signal detection circuit. 11...Program changeover switch, 21, 22...Output terminal, 31...Matrix control circuit, 32...Main channel signal switch circuit, 33...Switch circuit, D1~
D8...diode, TR1~TR3...transistor.

Claims (1)

[Claims for Utility Model Registration] Receiving the main channel signal and the sub channel signal, separating the main audio output and the sub audio output from both signals, according to the control signal in the audio multiplex signal and the set position of the program changeover switch,
It has a matrix circuit that outputs one of the audio outputs to a first output terminal and the other to a second output terminal, and the first output terminal is connected to a speaker and the second output terminal is connected to a speaker. In an audio multiplex signal receiving device whose terminal is connected to an earphone terminal, the main signal is separated from the control signal and receives the double audio detection signal output when receiving the dual audio broadcast and the both audio outputs. a sub selection circuit; a first recording terminal connected to either the first output terminal or the second output terminal; and a second recording terminal connected to the output side of the main-sub selection circuit. and the main-sub selection circuit, while receiving the double audio detection signal, sends the same audio output to the second recording terminal as the audio output applied to the first recording terminal.
An audio multiplex signal receiving device characterized in that it is applied to a recording terminal of.