JPH0432865Y2 - - Google Patents

Description

[Detailed Description of the Invention] Detailed Description of the Invention The present invention relates to a signal control device that controls the transmission of audio signals.

Conventionally, a magnetic tape recording only the orchestral accompaniment of a popular song is played back, the popular song is sung along with the orchestral accompaniment emitted from a speaker, and this singing is emitted from the speaker using a microphone (hereinafter referred to as the microphone). is widely practiced, and dedicated playback devices are also on sale. However, even if an ordinary person uses such a reproducing device, it is difficult for the general public to suddenly sing along with orchestral accompaniment, and a certain amount of practice is required. For this reason, there are also magnetic tapes with orchestral accompaniment on one track and model singing by singers on the other track, and practitioners practice singing by imitating the model singing while playing back the orchestral accompaniment from this tape. be able to. Even in this case, it is desirable that only the practice song be emitted from the speakers. Therefore, conventionally, a three-pole single-head plug 3 to which a microphone 1 and headphone 2 are connected as shown in FIG. was controlled so that the practice singer could hear the model singing through the headphone 2, and at the same time, the practice singing was broadcast from the speaker using the microphone 1. however,
Such a controller has a complicated structure and also has problems with long-term operational stability, such as contact resistance of the control contacts of the jack.

In view of this point, the present invention aims to provide an audio signal control device that operates stably with a simple configuration.Hereinafter, an embodiment of the audio signal control device of the present invention will be described with reference to the drawings. let's.

In FIG. 2, reference numeral 4 indicates a magnetic tape, on which an orchestral accompaniment is recorded on the left track and a model singing on the right track, and is run from a supply reel 5 to a take-up reel 6. Reference numeral 7 indicates a left playback head, which plays back the orchestral accompaniment recorded on the left track of the magnetic tape 4, and the played back orchestral accompaniment is emitted from the left speaker 9 via the amplifier 8. Reference numeral 10 indicates a right playback head, which plays back the model singing recorded on the right track of tape 4. The output of the head 10 is connected to the first
and a second transmission path including the amplifier 12 and the resistor 13 to the first and second input terminals 14a and 14b of the differential amplifier 14, respectively. The output of the differential amplifier 14 is sent to the right speaker 15.
supply to. Reference numeral 16 denotes a three-pole single-head jack; the chip contact terminal 16t of this jack 16 is connected to the second input terminal 14b of the differential amplifier 14, and the ring contact terminal 16r is connected to the first input terminal of the differential amplifier 14. Connect each terminal to the terminal 16s of the sleeve conductor.
Ground.

As shown in FIG. 1, when the three-pole single-head plug 3 to which the microphone 1 and headphone 2 are connected is connected to the jack 16 and the playback device is operated, the resistor 11,
The microphone 1, the headphone 2, the amplifier 12, and the resistor 13 constitute a bridge, so the resistor 11
This bridge is balanced by appropriately setting the resistance values of the two input terminals 1 of the differential amplifier 14.
The model singing signals, which are the outputs of the playback head 10 appearing at 4a and 14b, can be at the same level. In such a case, the model singing signal is canceled out by the differential amplifier 14, which is a subtraction circuit, and the right speaker 1
Model singing will not be broadcast from 5 onwards. On the other hand, the model singing signal is supplied to the headphone 2 from the first terminal 14a of the differential amplifier 14 through the ring contact of the terminal 16r of the jack 16 and the ring of the three-pole single-head plug. You can practice while listening to. The practice singing signal from the microphone 1 passes through the tip of the plug 3, the tip contact piece of the jack 16, and the terminal 16t, and is then sent to the second terminal 1 of the differential amplifier 14.
4b. Therefore, only the practice song is emitted from the right speaker 15.

Furthermore, when connecting a two-pole single-head plug 17 to which only a normal microphone 1 is connected to the jack 16 as shown in FIG. As a result, the first input terminal 14a of the differential amplifier 14 is grounded, so the model singing signal is not canceled out by the differential amplifier 14 and the right speaker 15
From then on, the singing is performed by microphone 1, and the right playback head 10
It will be broadcast along with a model song by the singer.

In addition to the configuration of this example shown in FIG. 2, the singing signal or practice singing signal from the terminal 16t of the tip contact piece may be supplied to a separately provided speaker.

As described in detail above, according to the present invention, the model singing signal is applied to both input terminals of the differential amplifier 14 at the same phase and level, and the ring contact of the three-pole single-head jack is connected to the first terminal of the differential amplifier. Since the chip contact piece was connected to the input terminal 14a and the second input terminal 14b,
Without using a jack with control contacts or a controller with a complicated configuration, the simple configuration of canceling the signal with the differential amplifier 14 can reliably and stably cut off the sound emitted from the speakers during model singing, and can also be used with headphones. Only practitioners can hear it.

[Brief explanation of the drawing]

1 and 3 are schematic diagrams for explaining the present invention, and FIG. 2 is a wiring diagram showing an embodiment of the audio signal control device of the present invention. 1 is a microphone, 2 is a headphone, 3 is a three-pole single-head plug, 4 is a magnetic tape, 7 and 10 are reproduction magnetic heads, 9 and 15 are speakers, 14 is a differential amplifier, and 16 is a three-pole single-head jack. .

Claims (1)

[Claims for Utility Model Registration] A subtraction circuit to which an audio signal is supplied via first and second transmission paths, a speaker to which the output of the subtraction circuit is supplied, first and second contacts, and a common 3 with contacts
a polar single-head jack, the audio signals from the first and second transmission paths are supplied to the first and second contacts, and the common contact is grounded. When using the three-pole single-head jack, when a microphone and headphone are connected between the first and second contacts and the common contact via the three-pole single-head plug, the subtraction circuit When the audio signals supplied from the first and second transmission paths are canceled by the above, and the second contact and the common contact are short-circuited via the outer conductor of the two-pole single-head plug. teeth,
An audio signal control device, wherein the audio signal supplied from the first transmission path is supplied to the speaker via the subtraction circuit.