| 摘要 |
An improved sound concentrates for selectively collecting sound and concentrating and transmitting the collected sound that include an emission circuit and a receiving circuit, each of these two circuits containing an antenna used as a signal transmission to communicate with each other. In the emission circuit, a selection switch is arranged, which enables users to choose one sound source among a variety of applications that the sound concentrator of the invention provides, such as telephones, microphones, television sets, and audio equipment, and so on. The receiving circuit receives signals from the emission circuit and contains an automatic volume control and a treble/bass boosting circuit to provide users a proper sound volume and quality and has an excellent collection effect for distant sounds.
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