| 摘要 |
PURPOSE:To realize a voice reproduction with a high quality for a receiving device of lincompex radio telephone system, by carrying out the process at and after the IF stage in separation into a voice channel and a control channel. CONSTITUTION:The arrived signal is amplified by an RF amplifier 1 and then converted into an intermediate frequency by a mixer 2 and the 1st local oscillator 8. This converted signal is separated into a voice channel and a control channel through filters 10 and 13 and amplified by IF amplifiers 11 and 14 respectively to be supplied to a demodulator 5. The output of a carrier oscillator 9 is injected to the other terminal of the demodulator, and the outputs of the amplifiers 11 and 14 are demodulated to the AF band. The signals of both amplifiers are synthesized at a lincompex demodulating part to reproduce an aural output. |
