NL146672B - SYNTHETIC SPEECH TRANSMISSION SYSTEM. - Google Patents

SYNTHETIC SPEECH TRANSMISSION SYSTEM.

Info

Publication number
NL146672B
NL146672B NL666602974A NL6602974A NL146672B NL 146672 B NL146672 B NL 146672B NL 666602974 A NL666602974 A NL 666602974A NL 6602974 A NL6602974 A NL 6602974A NL 146672 B NL146672 B NL 146672B
Authority
NL
Netherlands
Prior art keywords
channel
unvoiced
voiced
pass filter
integrator circuit
Prior art date
Application number
NL666602974A
Other languages
Dutch (nl)
Other versions
NL6602974A (en
Original Assignee
Ibm
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 Ibm filed Critical Ibm
Publication of NL6602974A publication Critical patent/NL6602974A/xx
Publication of NL146672B publication Critical patent/NL146672B/en

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Meter Arrangements (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Machine Translation (AREA)

Abstract

1,073,203. Vocoders. INTERNATIONAL BUSINESS MACHINES CORPORATION. Match 15,1966 [March 25, 1965], No. 11188/66. Heading H4R. Channel. vocoder in which each spectrum analysis channel includes a band-pass filter, a rectifier, and a low-pass filter, or integrator circuit; has a voiced-unvoiced detector the output from which is used to lower the cut-off frequency of the low-pass filter, or increase the integration time of the integrator circuit, when unvoiced sounds are detected; in order to reduce noise in the channels. The voiced-unvoiced detector may cause switching between two alternative filters provided for each channel, Fig. 2 (not shown), or it may modify the filtercircuit, e.g. by operation of switch Si. in the filter of Fig. 3. A typical integrator circuit which might be used in each spectrum analysis channel is shown in Fig. 5 in which the spectrum channel signal is applied to band causes capacitor C to be discharged by an amount proportional to the current applied through R 1' Periodically a signal is applied to line a to cause TR 2 to conduct to charge C up to the supply potential. The charging current, which will depend on the total discharge of C since the last charging pulse, flowing through R3 will produce an output pulse on Ki<SP>1</SP> the amplitude of which is proportional to the integral of the spectrum channel signal over a time equal to the period of the pulse signal applied to line a. The voiced-unvoiced discriminator output is employed to increase the period between the pulses applied to line b during unvoiced sounds.
NL666602974A 1965-03-25 1966-03-08 SYNTHETIC SPEECH TRANSMISSION SYSTEM. NL146672B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT275665A AT251656B (en) 1965-03-25 1965-03-25 Processes and arrangements for improving the speech quality in vocoder systems

Publications (2)

Publication Number Publication Date
NL6602974A NL6602974A (en) 1966-09-26
NL146672B true NL146672B (en) 1975-07-15

Family

ID=3539787

Family Applications (1)

Application Number Title Priority Date Filing Date
NL666602974A NL146672B (en) 1965-03-25 1966-03-08 SYNTHETIC SPEECH TRANSMISSION SYSTEM.

Country Status (10)

Country Link
US (1) US3431355A (en)
AT (1) AT251656B (en)
BE (1) BE677136A (en)
CH (1) CH443413A (en)
DE (1) DE1276740B (en)
ES (1) ES324621A1 (en)
FR (1) FR1471628A (en)
GB (1) GB1073203A (en)
NL (1) NL146672B (en)
SE (1) SE323721B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL84948A0 (en) * 1987-12-25 1988-06-30 D S P Group Israel Ltd Noise reduction system
EP0553906B1 (en) * 1992-01-21 1998-04-08 Koninklijke Philips Electronics N.V. Method and apparatus for sound enhancement with envelopes of multiband passed signals feeding comb filters
US5768473A (en) * 1995-01-30 1998-06-16 Noise Cancellation Technologies, Inc. Adaptive speech filter
US6108610A (en) * 1998-10-13 2000-08-22 Noise Cancellation Technologies, Inc. Method and system for updating noise estimates during pauses in an information signal

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012098A (en) * 1941-11-22 1961-12-05 Bell Telephone Labor Inc Telephone privacy
US2810787A (en) * 1952-05-22 1957-10-22 Itt Compressed frequency communication system
US3102928A (en) * 1960-12-23 1963-09-03 Bell Telephone Labor Inc Vocoder excitation generator
US3261916A (en) * 1962-11-16 1966-07-19 Ibm Adjustable recognition system

Also Published As

Publication number Publication date
AT251656B (en) 1967-01-10
CH443413A (en) 1967-09-15
FR1471628A (en) 1967-03-03
SE323721B (en) 1970-05-11
GB1073203A (en) 1967-06-21
DE1276740B (en) 1968-09-05
ES324621A1 (en) 1967-02-01
BE677136A (en) 1966-07-18
NL6602974A (en) 1966-09-26
US3431355A (en) 1969-03-04

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