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Category: Electronics - GPS - R U N AKKULATI PHONES.
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More From This Merchant. Free Shipping.In order to transfer a given information from one point to another, a technology for transmitting a code by utilizing a modulated wave, for example, a sound wave, is being used. One of the technologies is a push-to-talk type of PTT technology. With this PTT technology, when a radio-operator holds a talk button, a modulated wave is transmitted with a predetermined output power. Then, a radio-receiver side receives the modulated wave and decodes the received wave to thereby obtain an information transmitted from the radio-operator.
In the case of utilizing the PTT technology in a hands-free system, a talk button, a microphone and a radio-receiver are integrated into a single housing. A loudspeaker is arranged to produce a sound to the outside.
In a radio-receiver device for such a hands-free PTT system, there are cases where a noise caused by the PTT operation is input to a microphone. For example, there is a case where an operation sound is mixed in with a noise produced in a microphone and is input to a microphone, and a case where an operation sound is input to a radio-receiver device from a talk button, or the like, and is mixed in with a noise produced in the device.
As a solution for the problem, a technology for detecting whether an operation sound is input to a microphone from a talk button, or the like, is proposed. This technology is disclosed in, for example, JP-A-2003-172636.
According to the technology disclosed in JP-A-2003-172636, a talk button and a microphone are arranged on a single housing, and when an operation sound of the talk button is detected, a volume level of an operation sound is lowered to thereby inhibit the operation sound from being input to the microphone.
In this case, if an operation sound from a talk button, or the like, is input ac619d1d87
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