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由于无线话筒是利用无线电波进行工作的,因此与有线话筒相比较,在使用时具有可以自由移动的特点。此外,在电台的播音室,午台等场合使用都省去了馈线,也有利于解决由于馈线而产生的可靠性问题。但是,由于以前的无线话筒存在着声动态范围不足,由电波干涉产生的死点等问题,广播质量较低。因此,广播台只在十分有限的范围内使用。为了使无线话筒能够作为广播设备使用,必须使它具有高可靠性及好的广播质量。为此,正在研究与有线话筒具有同样性能的广播用无线话筒收发设备(其振荡器采用晶体振荡方式,同时改善调制性能,扩大动态范围,进而采用分集接收方式,以期解决死点问题,改善信噪比和失真性能,从而满足专用无线话筒设备必须具备的条件)。下面简要介绍一下这种专用无线话筒设备。
Because wireless microphones are operated by radio waves, they are free to move when used in comparison with wired microphones. In addition, the use of radio stations in the studio, on the afternoon and other occasions have saved the feeder, but also conducive to solve the reliability problems arising from the feeder. However, the previous wireless microphones suffer from problems such as insufficient acoustic dynamic range and dead spots caused by radio wave interference, resulting in low broadcast quality. Therefore, the broadcasting station is used only to a very limited extent. In order for the wireless microphone to be used as a broadcast device, it must be made highly reliable and have good broadcast quality. To this end, research is being conducted on a radio microphone receiving and transmitting apparatus having the same performance as that of a wired microphone (the oscillator adopts a crystal oscillation method while improving modulation performance, expanding a dynamic range, and further adopting a diversity reception method in order to solve a dead point problem, Noise ratio and distortion performance to meet the requirements of a dedicated wireless microphone device. Here’s a brief introduction of this dedicated wireless microphone device.