| 摘要 |
PURPOSE: A wireless microphone is provided to realize a wireless microphone for enduring an interference of a radio wave and restraining the noise occurrence. CONSTITUTION: A wireless microphone comprises a microphone(10), a microphone interface portion(11), an MP3 voice encoder(12), an FEC encoder(13), a modulator(14), a PN spreading portion(15), a high frequency amplifier(16), a power amplifier(17), and a controller(19). The microphone interface portion(11) receives a voice signal from a the microphone(10). The MP3 voice encoder(12) encodes the voice signal to an MP3 signal. The FEC encoder(13) performs an FEC encoding for the output signal of the MP3 voice encoder(12). The modulator(14) modulates the output signal of the FEC encoder(13) to a carrier signal. The PN spreading portion(15) spreads the output signal of the modulator(14). The high frequency amplifier(16) amplifies the output signal of the PN spreading portion(15) to a high frequency signal. The power amplifier(17) amplifies the output signal of the high frequency amplifier(16). The controller(19) controls operations of the power amplifier(17), the MP3 voice encoder(12), and the FEC encoder(13).
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