JPS609933Y2 - sound equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to an audio device, and its purpose is to disconnect the circuit necessary for speaker reproduction when listening to a pinaural source through headphones at the same time as the headphones are inserted. This is intended to reduce the troublesomeness of switching operations.

Conventionally, for example, a magnetic recording/reproducing device has adopted a circuit configuration as shown in FIG.

1 is a playback head for the left channel, 2 is a playback head for the right channel, 3 is a preamplifier for the left channel, 4 is a preamplifier for the right channel, 5 is a delay circuit for the left channel, 6
is a delay circuit for the right channel, 7 is an attenuation circuit for the left channel, 8 is an attenuation circuit for the right channel, 9 is a voltage amplification circuit for the left channel, 10 is a voltage amplification circuit for the right channel, 1
1 is a power amplifier for the left channel, 12 is a power amplifier for the right channel, J is a headphone jack, 13 is a left channel speaker, 14 is a right channel speaker, S
l-□, S□-2, S2-□? 52-2 is a binaural/stereo changeover switch.

Note that A represents the binaural side switching contact, mouth represents the stereo side switching contact, and C represents the fixed pole.

In the above configuration, when playing a pinaural source and listening to it through speakers 13 and 14, the tape on which the pinaural source is recorded is converted into an electrical signal by playback heads 1 and 2, and output as outputs for the left and right channels, respectively. , the left channel preamplifier 3, and the right channel preamplifier 4, and then through the pinaural side A of the pinaural/stereo selector switch St-1eS2-1, and further through the switch St-2? 32-2, left and right voltage amplifiers 9, 10, power amplifiers 11.12, headphone jack J□, and can be listened to by speakers 13.14.

However, if this continues, some signals that should be heard only in the left ear (not shown) will also enter the right ear (not shown) due to spatial crosstalk, which will cancel out the crosstalk. As a means, the output is applied through the left channel delay circuit 5 and attenuation circuit 7 to the right channel voltage amplifier 10 and power amplifier 12 through a pinaural stereo changeover switch 52-2 in the opposite phase. Spatial crosstalk is canceled and binaural sources can be played back through speakers.

Similarly, in the case of the left channel, the output can be applied in reverse phase.

However, when listening using headphones, spatial crosstalk does not occur, so there is no need to use a delay circuit or an attenuation circuit, and the binaural/stereo selector switch 5l-1? It was necessary to switch the S2-195t-2?52-2 to the stereo side port.

The present invention provides a device in which the pinaural/stereo selector switch is switched in conjunction with the headphone insertion operation no matter what position it is in, thereby reducing the troublesome operation. The configuration will be explained according to FIG. 1 shown as an example.

The same symbols as in FIG. 2 indicate the same parts.

53-1tS3 to 2933-3953-4 are switches that work with the headphone jack J1, and each contact piece a
are pinaural/stereo selector switches S□-□, S□
-2,52-1? 52-2, and the fixed poles of the switches 53-1 to 53-2 are connected to the output side of the preamplifier 3 or 4.

The contacts C of the switches 53-1 to 53-4 are pinaural.
Stereo selector switch 5l-1? 5l-2? 52-
1? When connected to the stereo side port of 52-2, when headphones are inserted, the left channel signal is converted into an electrical signal by the playback head 1, passed through the preamplifier 3, and then sent to the switch S.
3-□ fixed pole and contact piece c1 and switch 53-2
It is connected to the voltage amplifier 9 and the power amplifier 11 through the fixed pole b1 contact piece C, and can be listened to through headphones through the headphone jack J1.

The right channel signal can also be listened to in the same way.

Therefore, when listening to a pinaural source with headphones, there is no need to switch between the delay circuit 5.6 and the attenuation circuits 7 and 8, which are necessary for speaker reproduction.

This invention has a switch linked to the headphone jack as described above, so when switching from playing a pinaural source through speakers to listening through headphones, the circuit disconnection required only for speaker playback can be performed at the same time as the headphones are inserted. This makes it possible to reduce the troublesomeness of circuit switching operations.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a magnetic recording/reproducing device shown as an embodiment of the audio device according to the present invention, and FIG. 2 is a circuit diagram showing a conventional example. 1.2...Playback head, 5,6...Delay circuit, 7.8...Attenuation circuit, 13.14...
...Speaker, 5l-1? 5l-2? 52
-1? 52-2...Choice switch, 53-
n S3-21 S3-39 53-4°°6°°
°Switch % Jlooo...Headphone jack.

Claims (1)

[Scope of utility model registration request] a signal reproducing circuit including a dedicated circuit for reproducing a pinaural source through a speaker; a headphone jack for listening to headphones; and a signal reproducing circuit that automatically connects the dedicated circuit in connection with the insertion of a headphone plug into the headphone jack. An audio device characterized by comprising a switch mechanism that disconnects the sound automatically.