GB1334177A - Vocoder excitation system - Google Patents
Vocoder excitation systemInfo
- Publication number
- GB1334177A GB1334177A GB1995771*[A GB1334177DA GB1334177A GB 1334177 A GB1334177 A GB 1334177A GB 1334177D A GB1334177D A GB 1334177DA GB 1334177 A GB1334177 A GB 1334177A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- vocoder
- output
- excitation
- frequency
- 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
- 230000005284 excitation Effects 0.000 title abstract 5
- 239000003990 capacitor Substances 0.000 abstract 2
- 230000001419 dependent effect Effects 0.000 abstract 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000009499 grossing Methods 0.000 abstract 1
- 229910052734 helium Inorganic materials 0.000 abstract 1
- 239000001307 helium Substances 0.000 abstract 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 abstract 1
- 238000003786 synthesis reaction Methods 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
- 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)
- Analogue/Digital Conversion (AREA)
- Devices For Supply Of Signal Current (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
1334177 Vocoder systems STANDARD TELEPHONES & CABLES Ltd 10 June 1971 19957/71 Heading H4R In a channel vocoder analysis synthesis telephone system having analysis channels of different widths the excitation function signal is derived by summing in parallel the outputs of some or all of the analyser channel rectifiers and applying the resulting signal direct, and via a smoothing circuit 31, Fig. 3, to the two inputs of a differential amplifier 30. The differential amplifier output is squared, at 32, and drives a monostable, 40, Fig. 5, feeding a low pass filter 41 the output of which is a DC signal dependent on the input speech pitch frequency. As described, at the vocoder analyser, the level of the signal in a group of analysis channels for a higher frequency region of speech is compared with that in a group of channels for a lower frequency region in order to provide a voiced/ unvoiced switching signal. At the synthesizer the voiced/unvoiced signal controls a gate 50, Fig. 6, through which the D.C. excitation frequency signal is applied to a multivibrator 43, and also controls a switching circuit 55, 56 to switch either the output of the multivibrator or the output of a noise generator 51 to the input of an excitation pulse generator, Fig. 8, via a squaring circuit 60, Fig. 6. At the excitation pulse generator, Fig. 8, positive going edges of the input signal trigger monostable 81, the timing capacitor of which has its charge and discharge paths separated by diode 84 so that the charge on the capacitor is dependent on the elapsed time since the previous pulse, which tends to equalize the power of the pulse train irrespective of its frequency. The system can be used as a helium speech processor.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1995771 | 1971-06-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1334177A true GB1334177A (en) | 1973-10-17 |
Family
ID=10137952
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1995771*[A Expired GB1334177A (en) | 1971-06-10 | 1971-06-10 | Vocoder excitation system |
Country Status (4)
Country | Link |
---|---|
US (1) | US3825685A (en) |
FR (1) | FR2141363A5 (en) |
GB (1) | GB1334177A (en) |
NL (1) | NL7207374A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5113449A (en) * | 1982-08-16 | 1992-05-12 | Texas Instruments Incorporated | Method and apparatus for altering voice characteristics of synthesized speech |
JP4173940B2 (en) * | 1999-03-05 | 2008-10-29 | 松下電器産業株式会社 | Speech coding apparatus and speech coding method |
JP4179268B2 (en) * | 2004-11-25 | 2008-11-12 | カシオ計算機株式会社 | Data synthesis apparatus and data synthesis processing program |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3012098A (en) * | 1941-11-22 | 1961-12-05 | Bell Telephone Labor Inc | Telephone privacy |
US3071652A (en) * | 1959-05-08 | 1963-01-01 | Bell Telephone Labor Inc | Time domain vocoder |
US3377428A (en) * | 1960-12-29 | 1968-04-09 | Ibm | Voiced sound detector circuits and systems |
US3176073A (en) * | 1961-12-04 | 1965-03-30 | Gen Dynamics Corp | Buzz-hiss decision system for a channel vocoder |
US3418662A (en) * | 1965-03-31 | 1968-12-31 | Nat Res Dev | Prosthetic hand with improved control system for activation by electromyogram signals |
US3431362A (en) * | 1966-04-22 | 1969-03-04 | Bell Telephone Labor Inc | Voice-excited,bandwidth reduction system employing pitch frequency pulses generated by unencoded baseband signal |
US3573374A (en) * | 1968-01-25 | 1971-04-06 | Philco Ford Corp | Formant vocoder utilizing resonator damping |
NL6910496A (en) * | 1969-07-09 | 1971-01-12 | ||
US3624302A (en) * | 1969-10-29 | 1971-11-30 | Bell Telephone Labor Inc | Speech analysis and synthesis by the use of the linear prediction of a speech wave |
-
1971
- 1971-06-10 GB GB1995771*[A patent/GB1334177A/en not_active Expired
-
1972
- 1972-05-05 US US00250534A patent/US3825685A/en not_active Expired - Lifetime
- 1972-05-31 NL NL7207374A patent/NL7207374A/xx not_active Application Discontinuation
- 1972-06-12 FR FR7221061A patent/FR2141363A5/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US3825685A (en) | 1974-07-23 |
FR2141363A5 (en) | 1973-01-19 |
NL7207374A (en) | 1972-12-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
PCNP | Patent ceased through non-payment of renewal fee |