GB1250452A - - Google Patents

Info

Publication number
GB1250452A
GB1250452A GB1250452DA GB1250452A GB 1250452 A GB1250452 A GB 1250452A GB 1250452D A GB1250452D A GB 1250452DA GB 1250452 A GB1250452 A GB 1250452A
Authority
GB
United Kingdom
Prior art keywords
channel
khz
conversation
idle
party
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.)
Expired
Application number
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 filed Critical
Publication of GB1250452A publication Critical patent/GB1250452A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/04—Frequency-transposition arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/17—Time-division multiplex systems in which the transmission channel allotted to a first user may be taken away and re-allotted to a second user if the first user becomes inactive, e.g. TASI

Abstract

1,250,452. Multiplex signalling. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. 30 Dec., 1968 [26 Sept., 1967], No. 43692/67. Heading H4R. In a multi-channel frequency division multiplex transmission system a circuit is switched between a full circuit bandwidth channel when the channel is active and a reduced bandwidth channel when the channel is idle. As described two terminal stations 5 and 6 are interconnected via a cable 9 carrying an equal number of 3 kHz wide channels and 1 kHz wide channels in each direction. Subscribers T 1 and T 2 are connected to the terminal station via switching devices operated by a speech detector so that while a subscriber is active, i.e. talking, he is connected to a 3 kHz channel and while he is idle, i.e. listening to the other party to the conversation, he will be connected to a 1 kHz channel. Operation of the speech detector causes the transmission of a control signal to indicate to which channel the other party to the conversation is to be connected to receive the signals.
GB1250452D 1967-09-26 1967-09-26 Expired GB1250452A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4369267 1967-09-26

Publications (1)

Publication Number Publication Date
GB1250452A true GB1250452A (en) 1971-10-20

Family

ID=10429891

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1250452D Expired GB1250452A (en) 1967-09-26 1967-09-26

Country Status (1)

Country Link
GB (1) GB1250452A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0047588A2 (en) * 1980-09-09 1982-03-17 Northern Telecom Limited Mitigation of noise signal contrast in digital speech interpolation transmission system
US4363122A (en) 1980-09-16 1982-12-07 Northern Telecom Limited Mitigation of noise signal contrast in a digital speech interpolation transmission system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0047588A2 (en) * 1980-09-09 1982-03-17 Northern Telecom Limited Mitigation of noise signal contrast in digital speech interpolation transmission system
EP0047588A3 (en) * 1980-09-09 1982-03-31 Northern Telecom Limited Mitigation of noise signal contrast in digital speech interpolation transmission system
US4363122A (en) 1980-09-16 1982-12-07 Northern Telecom Limited Mitigation of noise signal contrast in a digital speech interpolation transmission system

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees