公开(公告)号：US3795876A

公开(公告)日：1974-03-05

申请号：US3795876D

申请日：1972-04-04

Applicant: VICTOR COMPANY OF JAPAN

Inventor： TAKAHASHI N ,  ITOH Y ,  FUJITA Y ,  NISHIKAWA K ,  ISHIGAKI Y

IPC: H03G9/18 ,  H04B1/64

CPC classification number: H03G9/18

Abstract: A compression and/or expansion system comprises fixed frequency characteristic changing means having a specific fixed frequencyresponse characteristic which increases or decreases the level of an input signal in a predetermined frequency band. A variable frequency characteristic changing means has a characteristic which varies so that it approaches a characteristic complimentary with the characteristic of the fixed frequency characteristic change means as the level of the input signal becomes larger and approaches a flat characteristic as the level of the signal becomes smaller. The signal is effectively compressed or expanded according to its level by passing through the fixed and variable frequency characteristic change means.

Abstract translation: 压缩和/或扩展系统包括具有特定固定频率响应特性的固定频率特性改变装置，其增加或减少预定频带中的输入信号的电平。 可变频率特性改变装置具有随着信号电平变大而接近与固定频率特性改变装置的特性互补的特性的特性，随着信号电平变小而变得平坦特性 。 信号通过穿过固定和可变频率特性改变装置根据其电平被有效地压缩或扩大。