| 摘要 |
PROBLEM TO BE SOLVED: To enable analog transmission capable of excluding the influence of PCM noise by dividing an input signal into a signal for analog transmission and a signal for digital signal processing and switching a system output signal to the signal for analog transmission. SOLUTION: The analog input signal 104 is inputted to an analog switch 7 not through a path for digitization, i.e., the path of an A/D converter 4 and aθ/A converter 6, but directly. The analog input signal 104 inputted to the analog switch 7 as it is has no PCM node. Namely, when a transmit signal of modem data communication etc., is inputted to this system, the analog input signal 104 is inputted to the analog switch 7, which outputs the signal as an analog output signal 108, thereby enabling analog signal transmission free of the influence of PCM noise without making high the performance of the digital signal processing system itself.
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