GB1383621A – Apparatus for detecting the fundamental frequency of a speech sound
– Google Patents
GB1383621A – Apparatus for detecting the fundamental frequency of a speech sound
– Google Patents
Apparatus for detecting the fundamental frequency of a speech sound
Info
Publication number
GB1383621A
GB1383621A
GB1091473A
GB1091473A
GB1383621A
GB 1383621 A
GB1383621 A
GB 1383621A
GB 1091473 A
GB1091473 A
GB 1091473A
GB 1091473 A
GB1091473 A
GB 1091473A
GB 1383621 A
GB1383621 A
GB 1383621A
Authority
GB
United Kingdom
Prior art keywords
slope
difference
line
register
gate
Prior art date
1972-03-28
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
GB1091473A
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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.)
1972-03-28
Filing date
1973-03-06
Publication date
1974-02-12
1973-03-06
Application filed by International Business Machines Corp
filed
Critical
International Business Machines Corp
1974-02-12
Publication of GB1383621A
publication
Critical
patent/GB1383621A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G10—MUSICAL INSTRUMENTS; ACOUSTICS
G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 – G10L21/00
G10L25/90—Pitch determination of speech signals
Abstract
1383621 Excitation frequency detector INTERNATIONAL BUSINESS MACHINES CORP 6 March 1973 [28 March 1972] 10914/73 Heading H4R Fundamental frequency of a speech signal is determined by sampling the speech signal and generating digital values representative of each sample, determining the absolute value of the difference between each successive pair of sample values, continuously summing the absolute differences to obtain for each sample «i» a function «S(i)» and detecting variations in the slope of that function to indicate the time at which the mouth cavities are excited, i.e. the time at which differences between successive sample values start to increase after a period in which they have been decreasing. As described speech is sampled at 100 Ásec intervals and digitally coded in pcm coder 1. Differences between successive samples are provided by subtractor 7 fed directly from coder 2 on one input and via a one sample period delay 4 on the other input. The absolute value of the difference is provided by unit 10. Adder 11 and register 13 enable a running total to be provided for the absolute differences, while shift registers 17 and 19, both of which provide twenty sample periods delay, allow the comparison, in subtractors 20 and 21, of the running totals at three sampling points spaced twenty sampling periods apart, to give an indication of the slopes before and after the middle sampling point. The slopes are compared in subtractor 23 to provide on line 26 the magnitude of the difference in slopes, and on line 27 the sign of the difference in slopes. When line 27 is positive, corresponding to an increase in slope of the sum of the difference signals which occurs at the commencement of the excitation period, AND gate 28 is enabled passing the signal on line 26 to line 29. The slope difference signal is filtered in digital filter 30, to remove small high frequency variations, and applied to comparator 44 and register 42, via AND gate 43 which is enabled only when the comparator 44, which compares current slope and the slope stored in register 42, provides an output indicating that the current slope is larger than the stored slope. When the opposite condition occurs the value then stored in register 42 is held and the comparator 44 output signal is fed through inverter 47, and gate 48 to bi-stable circuits 52, 53, to produce a short pulse on the output of AND gate 57 indicating the start of the excitation period. When the sign of the slope difference signal on line 49 first goes positive, prior to the commencement of an excitation period, the register 42 and bi-stable 52, 53, are reset ready to detect the following maximum slope difference indicating start of the excitation period. The units shown dotted are provided to give a variable threshold to the maximum slope difference value detector by enabling and gate 48 only when the maximum detected by the comparator 44 bears a predetermined relation, e.g. more than half, the previous maximum detected.
GB1091473A
1972-03-28
1973-03-06
Apparatus for detecting the fundamental frequency of a speech sound
Expired
GB1383621A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
FR7211396A
FR2178410A5
(en)
1972-03-28
1972-03-28
Publications (1)
Publication Number
Publication Date
GB1383621A
true
GB1383621A
(en)
1974-02-12
Family
ID=9096125
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1091473A
Expired
GB1383621A
(en)
1972-03-28
1973-03-06
Apparatus for detecting the fundamental frequency of a speech sound
Country Status (4)
Country
Link
JP
(1)
JPS551597B2
(en)
DE
(1)
DE2312356A1
(en)
FR
(1)
FR2178410A5
(en)
GB
(1)
GB1383621A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO2010049305A3
(en)
*
2008-10-27
2011-05-05
Robert Bosch Gmbh
Device for detecting a change of a generator output signal of a vehicle generator
CN111145044A
(en)
*
2020-01-09
2020-05-12
三峡大学
Power quality disturbance detection method for power distribution network based on EWT and MFDE
Families Citing this family (5)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2147413A5
(en)
*
1971-07-27
1973-03-09
Escher Wyss France
Pneumatic drier for powders and granules – fed by fluidised bed using hot air
JPS5323783U
(en)
*
1976-08-05
1978-02-28
JPH01178191U
(en)
*
1988-06-07
1989-12-20
WO1993009531A1
(en)
*
1991-10-30
1993-05-13
Peter John Charles Spurgeon
Processing of electrical and audio signals
JPH0576993U
(en)
*
1992-03-25
1993-10-19
菊夫 今井
Bicycle accelerator that reuses energy consumption
1972
1972-03-28
FR
FR7211396A
patent/FR2178410A5/fr
not_active
Expired
1973
1973-02-28
JP
JP2340773A
patent/JPS551597B2/ja
not_active
Expired
1973-03-06
GB
GB1091473A
patent/GB1383621A/en
not_active
Expired
1973-03-13
DE
DE19732312356
patent/DE2312356A1/en
active
Pending
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO2010049305A3
(en)
*
2008-10-27
2011-05-05
Robert Bosch Gmbh
Device for detecting a change of a generator output signal of a vehicle generator
US8692522B2
(en)
2008-10-27
2014-04-08
Robert Bosch Gmbh
Device for detecting a change in a generator output signal of a vehicle generator
CN111145044A
(en)
*
2020-01-09
2020-05-12
三峡大学
Power quality disturbance detection method for power distribution network based on EWT and MFDE
Also Published As
Publication number
Publication date
FR2178410A5
(en)
1973-11-09
DE2312356A1
(en)
1973-10-18
JPS4916308A
(en)
1974-02-13
JPS551597B2
(en)
1980-01-16
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Legal Events
Date
Code
Title
Description
1975-06-25
PS
Patent sealed
1982-09-29
PCNP
Patent ceased through non-payment of renewal fee
