NOISE REDUCTION CIRCUIT

摘要

The circuit comprises a main signal path and auxiliary signal path having a high-pass filter characteristic. The circuit may be used as a compression circuit or an expansion circuit in conjunction with a transmitter or a receiver, respectively. The auxiliary signal path includes a voltage dividing circuit, a voltage-to-circuit converting circuit, a differential amplifier, and a voltage buffer connected between an input terminal and an operational amplifier. The main signal path is constituted by a resistance connected between the input terminal and the operational amplifier.