JPS54124605A - Pitch extraction unit - Google Patents

Pitch extraction unit

Info

Publication number
JPS54124605A
JPS54124605A JP3268678A JP3268678A JPS54124605A JP S54124605 A JPS54124605 A JP S54124605A JP 3268678 A JP3268678 A JP 3268678A JP 3268678 A JP3268678 A JP 3268678A JP S54124605 A JPS54124605 A JP S54124605A
Authority
JP
Japan
Prior art keywords
data
circuit
average amplitude
retrieval
width
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.)
Pending
Application number
JP3268678A
Other languages
Japanese (ja)
Inventor
Katsunobu Fushikida
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 JP3268678A priority Critical patent/JPS54124605A/en
Publication of JPS54124605A publication Critical patent/JPS54124605A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

PURPOSE: To reduce pitch detection errors by making the detection range of a pitch narrow in case of a large average amplitude width and making the detection range of the pitch period wide in case of a small average amplitude width.
CONSTITUTION: Sound waveform data is inputted to average amplitude width calculating circuit 203 and auto-correlation value calculating circuit 204 through input terminal 201. Maximum value detector circuit 206 detects the maximum value from circuit 204 according to data from retrieval range data generator circuit 205, and not only outputs data from output terminal 212 but also feeds back data to circuit 205. Circuit 205 leads out retrieval width data from retrieval range data table 207 according to average amplitude width data from circuit 203 and generates the value, which is obtained by adding the retrieval width data above to data fed back from circuit 206, as the upper limit value of the detection range in the next frame and outputs this value as control data of circuit 206. Pitch period data are outputted successively by repeating this operation.
COPYRIGHT: (C)1979,JPO&Japio
JP3268678A 1978-03-20 1978-03-20 Pitch extraction unit Pending JPS54124605A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3268678A JPS54124605A (en) 1978-03-20 1978-03-20 Pitch extraction unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3268678A JPS54124605A (en) 1978-03-20 1978-03-20 Pitch extraction unit

Publications (1)

Publication Number Publication Date
JPS54124605A true JPS54124605A (en) 1979-09-27

Family

ID=12365746

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3268678A Pending JPS54124605A (en) 1978-03-20 1978-03-20 Pitch extraction unit

Country Status (1)

Country Link
JP (1) JPS54124605A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6186800A (en) * 1984-10-03 1986-05-02 三洋電機株式会社 Real time voice analysis system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6186800A (en) * 1984-10-03 1986-05-02 三洋電機株式会社 Real time voice analysis system

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