GB1305819A - - Google Patents

Info

Publication number
GB1305819A
GB1305819A GB3388270A GB3388270A GB1305819A GB 1305819 A GB1305819 A GB 1305819A GB 3388270 A GB3388270 A GB 3388270A GB 3388270 A GB3388270 A GB 3388270A GB 1305819 A GB1305819 A GB 1305819A
Authority
GB
United Kingdom
Prior art keywords
counter
detector
speech
millisec
pulses
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
GB3388270A
Other languages
English (en)
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 GB1305819A publication Critical patent/GB1305819A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/212—Time-division multiple access [TDMA]
    • 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
    • H04J3/175—Speech activity or inactivity detectors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
GB3388270A 1969-07-14 1970-07-13 Expired GB1305819A (en, 2012)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US84152869A 1969-07-14 1969-07-14
US1918470A 1970-03-13 1970-03-13

Publications (1)

Publication Number Publication Date
GB1305819A true GB1305819A (en, 2012) 1973-02-07

Family

ID=26691957

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3388270A Expired GB1305819A (en, 2012) 1969-07-14 1970-07-13

Country Status (7)

Country Link
US (1) US3712959A (en, 2012)
JP (1) JPS5250483B1 (en, 2012)
DE (1) DE2034623C2 (en, 2012)
FR (1) FR2060544A5 (en, 2012)
GB (1) GB1305819A (en, 2012)
NL (1) NL173340C (en, 2012)
SE (1) SE365922B (en, 2012)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE786256A (fr) * 1971-07-15 1973-01-15 Philips Nv Dispositif de commutation commande par des signaux
FR2157143A5 (en, 2012) * 1971-10-19 1973-06-01 Queffeulou Jean Yves
US3864520A (en) * 1972-07-25 1975-02-04 Ford Ind Inc Signal monitoring control apparatus
US3825694A (en) * 1972-10-30 1974-07-23 Cit Alcatel Conversation detector for a telephonic channel concentrator
US3832491A (en) * 1973-02-13 1974-08-27 Communications Satellite Corp Digital voice switch with an adaptive digitally-controlled threshold
US3832493A (en) * 1973-06-18 1974-08-27 Itt Digital speech detector
US3890467A (en) * 1973-11-01 1975-06-17 Communications Satellite Corp Digital voice switch for use with delta modulation
US3882458A (en) * 1974-03-27 1975-05-06 Gen Electric Voice operated switch including apparatus for establishing a variable threshold noise level
IT1014614B (it) * 1974-04-24 1977-04-30 Sits Soc It Telecom Siemens Circuito per rivelare la presenza di attivita in banda fonica in una giunzione telefonica
JPS5154703A (en, 2012) * 1974-11-08 1976-05-14 Oki Electric Ind Co Ltd
IT1044353B (it) * 1975-07-03 1980-03-20 Telettra Lab Telefon Metodo e dispositivo per il rico noscimento della presenza e.o assenza di segnale utile parola parlato su linee foniche canali fonici
US4052568A (en) * 1976-04-23 1977-10-04 Communications Satellite Corporation Digital voice switch
US4028496A (en) * 1976-08-17 1977-06-07 Bell Telephone Laboratories, Incorporated Digital speech detector
DE2649259C2 (de) * 1976-10-29 1983-06-09 Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg Verfahren zum automatischen Erkennen von gestörter Telefonsprache
US4130739A (en) * 1977-06-09 1978-12-19 International Business Machines Corporation Circuitry for compression of silence in dictation speech recording
US4323730A (en) * 1979-06-13 1982-04-06 Northern Telecom Limited Idle channel noise suppressor for speech encoders
FR2466825A1 (fr) * 1979-09-28 1981-04-10 Thomson Csf Dispositif de detection de signaux vocaux et systeme d'alternat comportant un tel dispositif
CA1147071A (en) * 1980-09-09 1983-05-24 Northern Telecom Limited Method of and apparatus for detecting speech in a voice channel signal
US4357491A (en) * 1980-09-16 1982-11-02 Northern Telecom Limited Method of and apparatus for detecting speech in a voice channel signal
US4573188A (en) * 1982-06-10 1986-02-25 The Aerospace Corporation Digital to analog converter
US4499594A (en) * 1982-06-10 1985-02-12 The Aerospace Corporation Digital to analog converter
JPH07113840B2 (ja) * 1989-06-29 1995-12-06 三菱電機株式会社 音声検出器
JP2908168B2 (ja) * 1993-03-15 1999-06-21 シャープ株式会社 信号識別回路
JPH0990974A (ja) * 1995-09-25 1997-04-04 Nippon Telegr & Teleph Corp <Ntt> 信号処理方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3369080A (en) * 1964-12-16 1968-02-13 Bell Telephone Labor Inc Conference circuit for coded signals permitting conference calls between vocoder and analogue stations
US3424869A (en) * 1965-06-15 1969-01-28 Bell Telephone Labor Inc Digital speech interpolation communication system

Also Published As

Publication number Publication date
DE2034623A1 (de) 1971-04-08
NL173340C (nl) 1984-01-02
US3712959A (en) 1973-01-23
FR2060544A5 (en, 2012) 1971-06-18
DE2034623C2 (de) 1982-12-09
NL173340B (nl) 1983-08-01
JPS5250483B1 (en, 2012) 1977-12-24
NL7010412A (en, 2012) 1971-01-18
SE365922B (en, 2012) 1974-04-01

Similar Documents

Publication Publication Date Title
JPS5250483B1 (en, 2012)
GB1521671A (en) Data transmission system and application thereof to the transmission of analogue signals and of data in a network with delta modulation
GB1495616A (en) Apparatus to permit testing of a communication circuit
CA1032478A (en) Digital transmission system for transmitting speech signals at a low bit rate, and transmitter for use in such a system
GB1490324A (en) Preparing alpha-hydroxyisobutyramide
EP0282101A3 (en) Receive coupler for binary data communication systems
GB1309570A (en) Degradation detection in a pcm system
SE8503764D0 (en, 2012)
GB1455060A (en) Doppler sonar equipment
ES427362A1 (es) Un detector de voz digital.
ES8303856A1 (es) Perfeccionamientos en un dispositivo numerico para la discriminacion entre senales vocales y senales de datos, ambas digitalizadas.
GB1165658A (en) Data Signalling Systems.
EP0090314A3 (en) Pcm encoder conformable to the a-law
AU581267B2 (en) Digital signal processing system and method
GB1505059A (en) Signal transition detector
GB1142578A (en) Improvements in or relating to delta-modulation electrical communication systems
US3890467A (en) Digital voice switch for use with delta modulation
GB1343869A (en) Method and apparatus for detecting a speech signal in the presence of noise
GB1217780A (en) Digital companding loops for monobit encoder
ES426518A1 (es) Perfeccionamientos en los codificadores-descodificadores para sistemas telefonicos con division de tiempo.
CA2027244A1 (en) Digital telephone system circuits
AU501272B2 (en) Encoding and decoding speech signals
EP0100169A3 (en) Time compression multiplex digital transmission system
JPS5468102A (en) Sound reinforcement system
GB1212108A (en) Switching arrangement for echo sounders

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years