公开(公告)号：US3916341A

公开(公告)日：1975-10-28

申请号：US39275373

申请日：1973-08-29

Applicant: PHILIPS CORP

Inventor： COOL HANS

IPC: H04M1/76 ,  H03B1/00 ,  H03B5/24 ,  H03B5/26 ,  H04L27/26 ,  H04M1/50 ,  H04Q1/45 ,  H04Q7/14 ,  H03B3/04

CPC classification number: H03B5/24 ,  H03B2201/01 ,  H04M1/50

Abstract: An arrangement for generating signals for selection, in particular for use in telephone subscribers sets. The device comprises a switchable RC- oscillator which is composed of an amplifier with negative feedback and a frequency-dependent voltage divider for positive feedback which comprises resistors, capacitors and switches. The frequency-dependent voltage divider has a configuration such that, if one switch is closed, the attenuation is smaller than the amplification of the amplifier and, if two switches are closed, the attenuation is larger than the amplification.

Abstract translation: 用于产生用于选择的信号的装置，特别是用于电话用户组中。 该器件包括一个可切换的RC振荡器，由一个负反馈的放大器和一个正向反馈的频率分压器组成，包括电阻，电容和开关。 频率相关的分压器具有如下结构：如果一个开关闭合，则衰减小于放大器的放大，并且如果两个开关闭合，则衰减大于放大。