FR1398997A - Vocoder system - Google Patents
Vocoder systemInfo
- Publication number
- FR1398997A FR1398997A FR973634A FR973634A FR1398997A FR 1398997 A FR1398997 A FR 1398997A FR 973634 A FR973634 A FR 973634A FR 973634 A FR973634 A FR 973634A FR 1398997 A FR1398997 A FR 1398997A
- Authority
- FR
- France
- Prior art keywords
- signals
- speech
- transmitter
- fed
- synthesized
- 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.)
- Expired
Links
- 238000001228 spectrum Methods 0.000 abstract 5
- 101100218522 Schizosaccharomyces pombe (strain 972 / ATCC 24843) bpb1 gene Proteins 0.000 abstract 2
- 101100381920 Arabidopsis thaliana BPA1 gene Proteins 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000005284 excitation Effects 0.000 abstract 1
- 239000000284 extract Substances 0.000 abstract 1
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
-
- 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)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Telephonic Communication Services (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
1,044,991. Vocoder systems. G. FANT. May 7, 1964 [May 8, 1963], No. 19139/64 Heading H4R. In a vocoder system in which speech signals are analysed to obtain signals representative of the amplitude and formant frequencies of the speech which latter signals are transmitted to a receiver where a synthesizer reconstitutes speech signals from the representative signals, the transmitter includes a synthesizer the output from which is applied to a series of band-pass filters which filter from the synthesized signal a series of successive portions of the frequency spectrum of the signal and the amplitudes of these successive portions of the spectrum are compared with the amplitudes of similar portions selected, by a second series of band-pass filters, from the spectrum of the original speech, the differences in these amplitudes being transmitted to modify the synthesized speech at the receiver and thus produce a more accurate replica of the original speech. Fig. 9 shows a preferred embodiment in which speech from a microphone M is fed via an amplifier F to an analyzer A.N. which extracts voiced-unvoiced signals G1-G2, pitch frequency F0, vowel formant frequencies F1, F2, F3, and consonant formant frequencies K1, and K2. These analogue signals are fed to an analogue to digital converter ADA and also to the transmitter synthesizer OVE. Both the original speech from amplifier F and the synthesized speech from OVE are applied to respective filter banks BPA1 ... BPA6 and BPB1 ... BPB6, the filters dividing the spectrum into frequency ranges of 0-350, 350-900, 900-1600, 1600- 2600, 2,600-1,500 and 4,500-9000. The outputs from corresponding filters in the original speech bank and the synthesized speech bank are rectified in rectifiers LRA1 ... LRA6 and LRB1 . . . LRB6, respectively, and compared in comparator circuits KO1 to KO6 and the difference signal is applied to the analogue to digital converter ADB for transmission to the receiver. At the receiver the digital signals are converted to analogue signals in the units DAA and DAB and the excitation function signals and the spectrum function signals are applied to the synthesizer OVE. The synthesized speech from OVE is applied to a bank of filters BPB1 ... BPB6 similar to those in the transmitter and the resulting contiguous sub-bands are fed to respective modulators MO1 . . . MO6 where their amplitudes are modified in accordance with the difference signals derived by the comparator units KO1 to KO6 in the transmitter to produce a speech signal to be fed to the telephone receivers T. At the transmitter the difference signal from the comparators KO1 . . . KO6 is also fed to a group of modulators MO1 . . . MO6 to operate on the synthesized signal at the transmitter, this modified synthesized signal being fed as side tone to the telephone receivers T. Switch SM is a voiceoperated switch which converts the equipment from the transmit mode to the receiving mode. The vocoder analyser may be of a serial form, Fig. 7 (not shown), or parallel form, Fig. 8 (not shown), formant tracking type and it is also suggested that the system may be used with channel vocoder systems.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE502763 | 1963-05-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR1398997A true FR1398997A (en) | 1965-05-14 |
Family
ID=20265538
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR973634A Expired FR1398997A (en) | 1963-05-07 | 1964-05-06 | Vocoder system |
Country Status (5)
Country | Link |
---|---|
US (1) | US3346695A (en) |
DE (1) | DE1202339B (en) |
FR (1) | FR1398997A (en) |
GB (1) | GB1044991A (en) |
NL (1) | NL6405028A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3860759A (en) * | 1970-09-23 | 1975-01-14 | California Inst Of Techn | Seismic system with data compression |
US4472832A (en) * | 1981-12-01 | 1984-09-18 | At&T Bell Laboratories | Digital speech coder |
FR2544901B1 (en) * | 1983-04-20 | 1986-02-21 | Zurcher Jean Frederic | CHANNEL VOCODER PROVIDED WITH MEANS FOR COMPENSATING FOR PARASITIC MODULATIONS OF THE SYNTHETIC SPEECH SIGNAL |
-
1964
- 1964-04-27 US US362771A patent/US3346695A/en not_active Expired - Lifetime
- 1964-05-06 NL NL6405028A patent/NL6405028A/en unknown
- 1964-05-06 FR FR973634A patent/FR1398997A/en not_active Expired
- 1964-05-06 DE DEF42801A patent/DE1202339B/en active Pending
- 1964-05-07 GB GB19139/64A patent/GB1044991A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1202339B (en) | 1965-10-07 |
NL6405028A (en) | 1964-11-09 |
US3346695A (en) | 1967-10-10 |
GB1044991A (en) | 1966-10-05 |
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