JPS51140411A - Sound input and output circuit for time division telephone exchange - Google Patents

Sound input and output circuit for time division telephone exchange

Info

Publication number
JPS51140411A
JPS51140411A JP6425075A JP6425075A JPS51140411A JP S51140411 A JPS51140411 A JP S51140411A JP 6425075 A JP6425075 A JP 6425075A JP 6425075 A JP6425075 A JP 6425075A JP S51140411 A JPS51140411 A JP S51140411A
Authority
JP
Japan
Prior art keywords
time division
output circuit
sound input
telephone exchange
toll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6425075A
Other languages
Japanese (ja)
Inventor
Kozo Kamata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6425075A priority Critical patent/JPS51140411A/en
Publication of JPS51140411A publication Critical patent/JPS51140411A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing

Abstract

PURPOSE:To simplify the construction of a toll trunk channel with a circuit having a filtering function for PAM modulation and demodulation circuit of a toll transit exchange, a sound frequency band limitting function for antisinging device of a terminal repeater and a sound amplifying function in case the toll transit exchange is altered to time division switching system.
JP6425075A 1975-05-30 1975-05-30 Sound input and output circuit for time division telephone exchange Pending JPS51140411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6425075A JPS51140411A (en) 1975-05-30 1975-05-30 Sound input and output circuit for time division telephone exchange

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6425075A JPS51140411A (en) 1975-05-30 1975-05-30 Sound input and output circuit for time division telephone exchange

Publications (1)

Publication Number Publication Date
JPS51140411A true JPS51140411A (en) 1976-12-03

Family

ID=13252715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6425075A Pending JPS51140411A (en) 1975-05-30 1975-05-30 Sound input and output circuit for time division telephone exchange

Country Status (1)

Country Link
JP (1) JPS51140411A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04287523A (en) * 1990-12-03 1992-10-13 American Teleph & Telegr Co <Att> Improvement of quality of aural signal of telephone network

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04287523A (en) * 1990-12-03 1992-10-13 American Teleph & Telegr Co <Att> Improvement of quality of aural signal of telephone network

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