JPS6115673Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is based on a wireless receiver that receives signals by switching the headphones to both ears or one ear.
The present invention relates to a structure of a receiver that can improve intelligibility when noise is mixed in.

Generally, when listening with headphones, sensitivity and intelligibility are better when listening with both ears than with one ear, but when there is a large amount of noise, there is a phenomenon in which listening with one ear is less affected by the noise than listening with both ears. be. Academically, this is called the interauricular suppression effect, for example.
It is described on page 87 of Introduction to Electrical and Acoustic Engineering by Masayasu Kawamura, published by Shokodo Co., Ltd.

Also, to test this effect, you can easily compare it by removing one of the binaural headphones from your ears, but one of the purposes of using headphones is for reception in places with a lot of external noise, so both It is desirable to be able to operate only one ear while keeping the unit in close contact with the ear.

In this invention, a switch is installed between the receiver's audio output stage and the headphone connection terminal (jack) to operate the left and right units of the headphone at the same time or by selecting only one of them, allowing the left and right units to operate independently. Headphones with a connection cord (all so-called stereo headphones belong to this type) can be used as is, and in conjunction with receiver operation, a switch can be installed on the panel or in an easily accessible location to enable reception. This has the advantage that it is easy to take the optimal response depending on the situation. In terms of cost, adding one switch to the entire receiver is negligible.

In general broadcast reception and commercial reception, it is not necessary to receive in such noisy conditions, but in amateur wireless communication, the purpose is often to receive radio waves with poor conditions, so this kind of intelligibility is necessary. Improvement is important.

The figure shows an embodiment of a circuit in which a changeover switch is provided between the audio output stage 1 of the receiver and the headphone connection terminal (jack) 2.
The contacts 3A and 3B are interlocked, and at the center position, both the A circuit and the B circuit drive the headphone units 5A and 5B in parallel through the jack 2 and plug 4.

When 3 is turned upward, the A circuit is connected to the jack, but the B circuit is cut off and the dummy resistor 6 is loaded. Therefore, unit 5A operates, but unit 5B stops operating. When 3 is pushed downward, the A circuit is cut off, the dummy resistor 6 becomes a load, and the B circuit is connected to the jack. Therefore, unit 5B operates, but unit 5A stops operating. In this way, the A side and the B side can be arbitrarily selected, so that the user does not have to change the headphone because the dominant ear differs depending on the person when using one ear.

As mentioned above, when using this invention, the existing receiver circuit is improved by simply adding a 2-circuit, 3-contact switch, and commercially available stereo headphones can be used as they are, with both ears, left ear, and right ear. It has great practical value as the operation can be selected arbitrarily.

[Brief explanation of the drawing]

The figure is an implementation circuit diagram of this invention. 1...Audio output stage, 2...Jack, 3...Switch, 4...Plug, 5...Headphone, 6...
...Dummy resistance.

Claims (1)

[Scope of utility model registration request] A switch 3 with two circuits and three contacts is interposed between the audio output stage 1 of the radio receiver and the jack 2 that connects the plug 4 of the headphone 5, and when the switch 3 is tilted upward, the audio output stage 1 and the headphone unit are connected. 5A and at the same time the headphone unit 5
B is disconnected and a dummy resistor 6 is connected in its place, and when the switch 3 is pushed down, the audio output stage 1 and the headphone unit 5B are connected, the headphone 5A is disconnected and the dummy resistor 6 is connected, and the switch 3 is located in the middle, the audio output stage 1 is connected to both headphone units 5A and 5B.