JPS57184334A - Noise eliminating device - Google Patents

Noise eliminating device

Info

Publication number
JPS57184334A
JPS57184334A JP56069817A JP6981781A JPS57184334A JP S57184334 A JPS57184334 A JP S57184334A JP 56069817 A JP56069817 A JP 56069817A JP 6981781 A JP6981781 A JP 6981781A JP S57184334 A JPS57184334 A JP S57184334A
Authority
JP
Japan
Prior art keywords
noise
signal
value
circuit
input signal
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
JP56069817A
Other languages
Japanese (ja)
Other versions
JPS6225298B2 (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 JP56069817A priority Critical patent/JPS57184334A/en
Priority to US06/373,437 priority patent/US4587620A/en
Publication of JPS57184334A publication Critical patent/JPS57184334A/en
Publication of JPS6225298B2 publication Critical patent/JPS6225298B2/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 sufficient suppression of noises although the noise section lasts for a long period of time, by storing plural post samples from the outpot of a signal switching means and producing the linear combination of the sampled value and the set coefficient in the form of a substitute signal. CONSTITUTION:The optimum estimation coefficient in a short section of an input signal is obtained through a linear estimation coefficient calculating circuit 1 and fed to a noise detecting circuit 2. The circuit 2 calculates the estimated value from the given estimation coefficient and then calculates the difference between said value the input signal. Then the presence of noise is decided when the absolute value of the difference is larger than the set threshold value. Thus A noise detecting trigger is produced. A signal switching circuit 3 leads the input signal to an output terminal when no noise is detected and leads a substitute signal to the output of eliminate the noise in case the noise detecting trigger is applied.
JP56069817A 1981-05-09 1981-05-09 Noise eliminating device Granted JPS57184334A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP56069817A JPS57184334A (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
JP56069817A JPS57184334A (en) 1981-05-09 1981-05-09 Noise eliminating device

Publications (2)

Publication Number Publication Date
JPS57184334A true JPS57184334A (en) 1982-11-13
JPS6225298B2 JPS6225298B2 (en) 1987-06-02

Family

ID=13413685

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56069817A Granted JPS57184334A (en) 1981-05-09 1981-05-09 Noise eliminating device

Country Status (1)

Country Link
JP (1) JPS57184334A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62242994A (en) * 1986-04-15 1987-10-23 ヤマハ株式会社 Musical tone signal generator
JPS6316721A (en) * 1986-07-09 1988-01-23 Fujitsu Ltd Noise eliminating device
US7254537B2 (en) 2002-03-28 2007-08-07 Fujitsu Limited Speech input device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62242994A (en) * 1986-04-15 1987-10-23 ヤマハ株式会社 Musical tone signal generator
JPS6316721A (en) * 1986-07-09 1988-01-23 Fujitsu Ltd Noise eliminating device
US7254537B2 (en) 2002-03-28 2007-08-07 Fujitsu Limited Speech input device

Also Published As

Publication number Publication date
JPS6225298B2 (en) 1987-06-02

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