JPS5634249A - Discriminating circuit for sound and data - Google Patents

Discriminating circuit for sound and data

Info

Publication number
JPS5634249A
JPS5634249A JP11058979A JP11058979A JPS5634249A JP S5634249 A JPS5634249 A JP S5634249A JP 11058979 A JP11058979 A JP 11058979A JP 11058979 A JP11058979 A JP 11058979A JP S5634249 A JPS5634249 A JP S5634249A
Authority
JP
Japan
Prior art keywords
signal
circuit
input
sound
data
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.)
Granted
Application number
JP11058979A
Other languages
Japanese (ja)
Other versions
JPS6310621B2 (en
Inventor
Takao Nishitani
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11058979A priority Critical patent/JPS5634249A/en
Publication of JPS5634249A publication Critical patent/JPS5634249A/en
Publication of JPS6310621B2 publication Critical patent/JPS6310621B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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)
  • Time-Division Multiplex Systems (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To make it possible to discriminate immediately whether the input signal is a sound signal or a model signal, by using a forecasting circuit dependent upon the linear forecasting method. CONSTITUTION:Sound forecasting circuit 600 adapted to a sound signal and data forecasting circuit 610 adapted to a data signal forecast the next sample value on the basis of past sample values and the statistical character of sound or data. The input signal from terminal 601 is input to circuits 600 and 610 and subtractors 620 and 630, and the difference between the output of circuit 600 and the input signal is operated by subtractor 620, and the error signal is input to smoothing circuit 650. Meanwhile, the difference between the output of circuit 610 and the input signal is operated by subtractor 630, and the error signal is input to smoothing circuit 650. Energy of the input signal is smoothed by circuits 640 and 650, and respective outputs are compared with each other by comparator 660; and when the output of circuit 640 is larger than that of circuit 650, a signal to report that the input signal is a data signal is output to output terminal 602.
JP11058979A 1979-08-29 1979-08-29 Discriminating circuit for sound and data Granted JPS5634249A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11058979A JPS5634249A (en) 1979-08-29 1979-08-29 Discriminating circuit for sound and data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11058979A JPS5634249A (en) 1979-08-29 1979-08-29 Discriminating circuit for sound and data

Publications (2)

Publication Number Publication Date
JPS5634249A true JPS5634249A (en) 1981-04-06
JPS6310621B2 JPS6310621B2 (en) 1988-03-08

Family

ID=14539679

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11058979A Granted JPS5634249A (en) 1979-08-29 1979-08-29 Discriminating circuit for sound and data

Country Status (1)

Country Link
JP (1) JPS5634249A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63194434A (en) * 1987-02-09 1988-08-11 Oki Electric Ind Co Ltd Transmission signal discriminating device
FR2643523A1 (en) * 1989-02-22 1990-08-24 Applic Electro Tech Avance Discriminator for digital transmissions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63194434A (en) * 1987-02-09 1988-08-11 Oki Electric Ind Co Ltd Transmission signal discriminating device
FR2643523A1 (en) * 1989-02-22 1990-08-24 Applic Electro Tech Avance Discriminator for digital transmissions

Also Published As

Publication number Publication date
JPS6310621B2 (en) 1988-03-08

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