JPS6040052Y2 - Television audio multiplex signal receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television audio multiplex signal receiver.

A general television audio multiplex receiver, as shown in FIG. 4 and a second channel comprising a second amplifier 5 and a second speaker 6.
When receiving dual audio broadcasts with this receiver, connect manual switch 2 to terminal 7 to receive the main channel signal from each speaker 4, 6, and connect to terminal 8 to receive the sub channel signal from each speaker. signal,
Further, when connected to the terminal 9, it is possible to simultaneously apply main and sub-pot channel signals to each speaker.

When the last mode is set, different information is emitted from each speaker, making it difficult to hear.

Therefore, in this case, change the settings to another mode, or
Alternatively, earphones (not shown) must be operated in place of the first or second speaker.

In the latter case, when the earphones are activated, the main and sub-channel signals can be received individually in this mode, but if the manual switch is connected to another mode, i.e. to terminal 7 or 8, the earphones cannot be used. Sometimes, even if it is desired to receive main and sub-channel signals individually, there is a drawback that the same signal as voice information from a speaker not using earphones is received.

The present invention is equipped with a headphone socket that allows the headphone plug to be attached and detached, so that regardless of the setting position of the mode command switch for dual audio broadcast reception, each main and subchannel signal is always received separately when using headphones. The aim is to provide a receiver that can.

Next, the present invention will be explained based on the embodiment shown in FIG.

10 is a television audio multiplex signal decoder, which has an input terminal 11 for introducing the television audio multiplex signal;
An eleventh second output terminal 12.13 that derives two types of output signals, respectively, and a first output terminal when receiving dual audio broadcasting.
, and first and second control terminals 14.15 for specifying the signal mode from the second output terminal 12.13.

The decoder 10 is designed to provide output signals corresponding to each input mode, as shown in the diagram of FIG.

As shown in the figure, the first and second control terminals 14 and 15 are disabled during monaural or stereo reception, and are set to various modes during dual broadcast reception.

The main and sub-channel signals M and S can be derived from the output terminals according to the mode.

For details of the internal configuration of this decoder, please refer to the paper entitled "Semiconductor Integrated Circuit for Receiving Television Audio Multiplex Broadcasting" published in Television Vol. 27, No. 1 (1973), pp. 31-42. The internal configuration itself is outside the gist of the present invention, so a description thereof will be omitted.

Reference numerals 16 and 17 designate first and second headphone sockets that allow attachment and detachment of a headphone plug (not shown), and each headphone socket has movable contact pieces 18 and 1, respectively.
9, first and second fixed contacts 20, 21 and 22, 23 selectively connected to the movable contact piece, and further a third contact 2.
4.25.

26 converts the signal from the first output terminal 12 of the decoder 10 into a first
a circuit for transmitting information to the first speaker 28 via the amplifier 27;
Reference numeral 29 outputs a signal from the second output terminal 13 of the decoder 10 when the headphone plug is not attached to the movable contact piece 18 of the first headphone socket 16, the first fixed contact 20, and the second amplifier 3.
0 to the second speaker 31.

32 determines whether the first control terminal 14 of the decoder 10 is grounded via the first fixed contact 21 and the movable contact piece 19 of the second headphone socket 17 when the headphone plug is not attached, or whether it is left open as shown in the figure. This is a mode command switch for selecting, and the grounding operation by this switch is disabled by attaching the headphone plug to the second headphone socket 17.

33, when the headphone plug is attached, the signal from the second output terminal 13 of the decoder 10 is sent to the movable contact piece 18 of the first headphone socket 16, the second fixed contact 22, and further to the third amplifier 34.
, the third headphone socket of this first headphone socket via a resistor 35.
This is a circuit for transmitting data to the contacts 24 and 25, and is configured so that the signal from the second output terminal 13 of the decoder 10 is not transmitted to the second amplifier 30 when this transmitting circuit is in operation.

36 is a circuit that grounds the second control terminal 15 of the decoder 10 via the second headphone socket 17 when the headphone plug is attached, and when this circuit is activated, the movable contact piece 19 of the second headphone socket 17 is connected to the ground. 1 fixed contact 21 to the 2nd
Since the first control terminal 14 of the decoder 10 is switched to the fixed contact 23, it acts to prohibit the first fixed contact 21 from grounding.

The amplification degrees of the first and second amplifiers 27 and 30 are set to be the same, and the third amplifier 34 has an amplification degree that is sufficiently low compared to these amplification degrees and is sufficient to drive headphones. It can be done.

Further, the resistor 35 is for adjusting the headphone output.

FIG. 4 is a chart for explaining the operation of this receiver.

When headphones are not worn and a stereo or monaural broadcast is being received, R or monaural signals can be received from the first and second speakers, respectively, and when a dual audio broadcast is being received, the switch 32 is connected to the terminal 14 or 14'. Depending on the selection, main or sub channel signals M and S can be emitted from the first and second speakers as shown in the figure.

However, each channel signal is emitted individually and does not cause discomfort.

Next, when the headphones are put on, the first
, the second control terminals 14 and 15 are necessarily a combination of by and low, so that the main channel signal can be derived from the first speaker 28, and the sub channel signal can be derived from the headphones.

This operation is guaranteed regardless of the setting position of the switch 32 when the headphone plug is attached to the headphone socket.

As mentioned above, with the receiver of the present invention, in order to be able to receive the main and subchannel signals simultaneously when receiving dual broadcasts, the headphone plug must be attached to the headphone socket, and when the headphone plug is attached, the mode command switch must be set. Since this function is disabled, there is no risk that different types of information will be emitted from each speaker and cause discomfort to the listener, and if the headphone plug is attached, the user will always be able to enjoy two types of information, making it easier to use. can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main part of a general receiver, and FIG. 2 is a diagram for explaining the operation of a decoder. FIG. 3 is a circuit diagram of an embodiment of the present invention, and FIG. 4 is a diagram for explaining its operation. 10...decoder, 16, 17...first
, second headphone socket, 28, 31...first and second speakers, 32...switch, 27,
30, 34... 1st, 2nd, 3rd amplifier.

Claims (1)

[Scope of utility model registration request] Specify an input terminal for introducing a television audio multiplex signal, first and second output terminals for respectively deriving two types of output signals, and a signal mode from the first and second output terminals when receiving a dual audio broadcast. When only the first control terminal is grounded, the first control terminal
, one channel signal of the main and sub-channel signals is derived from the second output terminal, and when both the eleventh and second control terminals are in an open state, the other channel signal of the main and sub-channel signals is derived from the first and second output terminals. a television audio multiplex signal decoder comprising first and second control terminals for deriving a signal and for deriving different channel signals from the first and second output terminals, respectively, when only the second control terminal is grounded; first and second headphone sockets capable of allowing attachment and detachment of a headphone plug; a circuit for transmitting a signal from a first output terminal of the decoder to a first speaker via a first amplifier; and the headphone plug. a circuit for transmitting a signal from a second output terminal of the decoder to a second speaker via the first headphone socket and a second amplifier when the headphone plug is not attached; a switch for selecting whether the first control terminal is grounded or open via the second headphone socket; and an output from the second output terminal of the decoder to the second amplifier when the headphone plug is attached. a circuit for simultaneously disabling the second output terminal and transmitting a signal from the second output terminal to the headphone plug via the first headphone socket and a third amplifier; and a first control circuit for the decoder when the headphone plug is attached. A television audio multiplex signal receiver comprising: a circuit for prohibiting grounding of the terminal and simultaneously grounding a second control terminal of the decoder via the second headphone socket.