JPS4912009B1 - - Google Patents
Info
- Publication number
- JPS4912009B1 JPS4912009B1 JP44004836A JP483669A JPS4912009B1 JP S4912009 B1 JPS4912009 B1 JP S4912009B1 JP 44004836 A JP44004836 A JP 44004836A JP 483669 A JP483669 A JP 483669A JP S4912009 B1 JPS4912009 B1 JP S4912009B1
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- formant
- pitch
- signal
- pulse
- 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
Links
- 230000005284 excitation Effects 0.000 abstract 3
- 238000013016 damping Methods 0.000 abstract 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000003990 capacitor Substances 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
Landscapes
- Engineering & Computer Science (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Electrophonic Musical Instruments (AREA)
- Electrotherapy Devices (AREA)
Abstract
1,261,552. Formant vocoder. PHILCOFORD CORP. 23 Jan., 1969 [25 Jan., 1968], No. 3859/69. Heading H4R. In the speech synthesizer of a formant vocoder the formant resonators are heavily damped for a short time prior to the application of each excitation pulse. Fig. 1 shows a formant vocoder in which the analyser derives signals representing the frequency, F1 &c., and amplitude, A1 &c., of the first three formants of an incoming speech signal, together with a signal P, indicating the pitch frequency and a signal V, indicating a voiced or unvoiced condition. At the receiver synthesizer the pitch signal controls the frequency of pulses which are applied, during voiced sounds, via a gating circuit 10 to modulators 14, 16, and 18 where the pitch pulses are modulated by the respective formant amplitude signals, A1, A2, and A3, filtered by variable frequency resonators whose resonant frequency is adjusted by the respective formant frequency signals, F1, F2, F3, before the signals are further filtered and combined to form the synthesized speech. The variable frequency resonators are arranged to be heavily damped by a pulse derived from the excitation signal immediately before the excitation pulse is applied to excite the filter, so as to eliminate any effect on the output from the filter during one pulse, of the energy still remaining from the previous pulse. Fig. 3 shows a circuit for the synthesis of one formant comprising a resonator 20 including a differential amplifier 44 connected in a loop with variable frequency high pass, 46, and low pass, 48, filters, each of which is tunable by the signal F1 to provide a circuit resonant at F1 formant frequency. The damping circuit, 32, comprises a fet connected from one input of the differential amplifier 44 to earth, and which is switched on just before a pitch pulse is generated via differential amplifier 38 fed with a signal derived from the pitch pulse generator 8. The pitch pulse generator comprises a capacitor 35 charged via the emitter collector path of transistor 33, the impedance of which is controlled by the pitch frequency signal. Just before the charging potential reaches a value to cause a pitch pulse to be generated by pulse generator 41, differential amplifier 38 is switched from negative to positive saturation, as the charging potential reaches the reference potential set by potentiometer 36, causing fet 40 to be switched on and the damping condition to be established. Reference has been directed by the Comptroller to Specification 1,146,184.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US70054268A | 1968-01-25 | 1968-01-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS4912009B1 true JPS4912009B1 (en) | 1974-03-20 |
Family
ID=24813892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP44004836A Pending JPS4912009B1 (en) | 1968-01-25 | 1969-01-24 |
Country Status (4)
Country | Link |
---|---|
US (1) | US3573374A (en) |
JP (1) | JPS4912009B1 (en) |
DE (1) | DE1903623C3 (en) |
GB (1) | GB1261552A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6113646U (en) * | 1983-10-31 | 1986-01-27 | 平谷産業株式会社 | Assembly type board chair |
JPH0329037U (en) * | 1989-08-01 | 1991-03-22 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3836717A (en) * | 1971-03-01 | 1974-09-17 | Scitronix Corp | Speech synthesizer responsive to a digital command input |
GB1334177A (en) * | 1971-06-10 | 1973-10-17 | Standard Telephones Cables Ltd | Vocoder excitation system |
NL8000361A (en) * | 1980-01-21 | 1981-08-17 | Philips Nv | DEVICE AND METHOD FOR GENERATING A VOICE SIGNAL |
DE19835578A1 (en) * | 1998-08-06 | 2000-02-10 | Bosch Gmbh Robert | Device for determining a rotation rate |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2817707A (en) * | 1954-05-07 | 1957-12-24 | Bell Telephone Labor Inc | Synthesis of complex waves |
US2928901A (en) * | 1956-04-13 | 1960-03-15 | Bell Telephone Labor Inc | Transmission and reconstruction of artificial speech |
US3268660A (en) * | 1963-02-12 | 1966-08-23 | Bell Telephone Labor Inc | Synthesis of artificial speech |
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 |
-
1968
- 1968-01-25 US US700542*A patent/US3573374A/en not_active Expired - Lifetime
-
1969
- 1969-01-23 GB GB3859/69A patent/GB1261552A/en not_active Expired
- 1969-01-24 DE DE1903623A patent/DE1903623C3/en not_active Expired
- 1969-01-24 JP JP44004836A patent/JPS4912009B1/ja active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6113646U (en) * | 1983-10-31 | 1986-01-27 | 平谷産業株式会社 | Assembly type board chair |
JPH0329037U (en) * | 1989-08-01 | 1991-03-22 |
Also Published As
Publication number | Publication date |
---|---|
DE1903623A1 (en) | 1969-11-20 |
US3573374A (en) | 1971-04-06 |
DE1903623B2 (en) | 1979-03-22 |
DE1903623C3 (en) | 1979-11-15 |
GB1261552A (en) | 1972-01-26 |
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