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为了满足在舞台特殊情况下的使用要求,舞台演员所使用的无线话筒发射机不但要求稳定可靠,而且对音质和信噪比的要求也很高,在实际使用中,无线话筒发射机的信噪比至少应大于40分贝,否则将会影响演出效果。为了便于演员随身携带,在设计时应考虑发射机电路尽可能简化,以缩小发射机的体积。通常将发射机做成钢笔型,如图1所示。为了提高无线话筒抗干扰性能并获得较高的信噪比,目前舞台上所使用的无线话筒发射机多数采用调频制。
In order to meet the special requirements in the stage of the use of requirements, the stage of the wireless microphone transmitter used not only requires stable and reliable, but also on the sound quality and signal to noise ratio is also very high, in actual use, wireless microphone transmitter signal noise Than at least more than 40 dB, otherwise it will affect the performance. In order to facilitate the performers carry, in the design should consider the transmitter circuit as simple as possible to reduce the size of the transmitter. The transmitter is usually made of pen type, shown in Figure 1. In order to improve the anti-jamming performance of the wireless microphone and obtain a higher signal-to-noise ratio, most of the wireless microphone transmitters currently used on the stage adopt frequency modulation.