JPS57184331A - Noise eliminating device - Google Patents

Noise eliminating device

Info

Publication number
JPS57184331A
JPS57184331A JP56069814A JP6981481A JPS57184331A JP S57184331 A JPS57184331 A JP S57184331A JP 56069814 A JP56069814 A JP 56069814A JP 6981481 A JP6981481 A JP 6981481A JP S57184331 A JPS57184331 A JP S57184331A
Authority
JP
Japan
Prior art keywords
signal
noise
detecting
circuit
estimation
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
JP56069814A
Other languages
Japanese (ja)
Other versions
JPS627741B2 (en
Inventor
Koji Niimi
Takayasu Kondo
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki 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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP56069814A priority Critical patent/JPS57184331A/en
Priority to US06/373,437 priority patent/US4587620A/en
Publication of JPS57184331A publication Critical patent/JPS57184331A/en
Publication of JPS627741B2 publication Critical patent/JPS627741B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/046—Systems or methods for reducing noise or bandwidth

Abstract

PURPOSE:To realize the detection of noie without having an error detecting code at a part of data, by detecting the noise by means of a linear estimating technique. CONSTITUTION:The input signal Xi is obtained by sampling and digitizing the original signal. The optimum estimation coefficient is obtained through a linear estimation coefficient calculating circuit 1 for a short section of the signal Xi to be fed to a noise detecting circuit 2. The circuit performs an operation for estimation based on the given estimation coefficient to calculate the differnce to the signal Xi. Then the existence of noise is decided in case the absolute value of the estimation error is larger than the set threshold value. Thus a noise detecting signal is produced. A signal compensating circuit 3 receives the noise detection signal and produces an appropriate substitute signal in place of the signal Xi to use it as an output signal. The signal Xi is used directly as an output signal in case no noise is detected.
JP56069814A 1981-05-09 1981-05-09 Noise eliminating device Granted JPS57184331A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP56069814A JPS57184331A (en) 1981-05-09 1981-05-09 Noise eliminating device
US06/373,437 US4587620A (en) 1981-05-09 1982-04-30 Noise elimination device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56069814A JPS57184331A (en) 1981-05-09 1981-05-09 Noise eliminating device

Publications (2)

Publication Number Publication Date
JPS57184331A true JPS57184331A (en) 1982-11-13
JPS627741B2 JPS627741B2 (en) 1987-02-19

Family

ID=13413599

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56069814A Granted JPS57184331A (en) 1981-05-09 1981-05-09 Noise eliminating device

Country Status (1)

Country Link
JP (1) JPS57184331A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942622A (en) * 1987-07-16 1990-07-17 Fujitsu Ten Limited Mobile radio-receiver system with improved reproduction characteristics of reception signal having noise superimposed thereon
JPH04113723A (en) * 1990-09-04 1992-04-15 Nec Corp Error correction system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0393430A (en) * 1989-09-04 1991-04-18 Matsushita Electric Ind Co Ltd Charging controller for battery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942622A (en) * 1987-07-16 1990-07-17 Fujitsu Ten Limited Mobile radio-receiver system with improved reproduction characteristics of reception signal having noise superimposed thereon
JPH04113723A (en) * 1990-09-04 1992-04-15 Nec Corp Error correction system

Also Published As

Publication number Publication date
JPS627741B2 (en) 1987-02-19

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