Delta modulation and demodulation system

Abstract

Abstract PURPOSE:To suppress the occurrence of cross modulation distortion for two signals without deteriorating the frequency characteristic of a transmission band and S/N, by attenuating enough high-band components of input signals in the SCPC satellite communication system, etc. CONSTITUTION:Input signals, which consist of sound signals or MF signals, from an exchange are coded dependently upon delta modulation in delta modulator 13 after having high-band components suppressed enough by input equalizer 12 which has characteristic A, and the coded output is transmitted through a modulator and a transmitter. In the receiving side, demodulated signals are applied to delta demodulator 16 to reproduce low-frequency signals. Then, original signals are reproduced faithfully by causing these signals to pass through output equalizer 17 which has characteristic B, and the output is transmitted to an exchange.

Inventors

• 👤 Masaru Asahara
• 👤 Ryushiro Yoshizawa
• 👤 Takao Hara

Bibliographic Details