FR2045207A5 - - Google Patents
Info
- Publication number
- FR2045207A5 FR2045207A5 FR6920702A FR6920702A FR2045207A5 FR 2045207 A5 FR2045207 A5 FR 2045207A5 FR 6920702 A FR6920702 A FR 6920702A FR 6920702 A FR6920702 A FR 6920702A FR 2045207 A5 FR2045207 A5 FR 2045207A5
- Authority
- FR
- France
- Prior art keywords
- comparator
- amplifier
- filters
- input
- impedances
- 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
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000005669 field effect Effects 0.000 abstract 1
- 230000001755 vocal effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H11/12—Frequency selective two-port networks using amplifiers with feedback
- H03H11/126—Frequency selective two-port networks using amplifiers with feedback using a single operational amplifier
-
- 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
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H11/12—Frequency selective two-port networks using amplifiers with feedback
- H03H11/1217—Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers
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)
- Networks Using Active Elements (AREA)
- Amplifiers (AREA)
Abstract
1308636 Active filters; speech synthesizer; pulse modulation circuits AGENCE NATIONALE DE VALORIZATION DE LA RECHERCHE 19 June 1970 [20 June 1969] 29931/70 Headings H3T H3U H4L and H4R An electrical filter which enables independent control of resonance frequency and of bandwidth comprises an amplifier 21, Fig. 2, whose gain is of the order of three, having an input connected to two impedances Z1a, Z1b of a first type arranged in series with respect to the input and having adjustable and substantially equal values, there being a negative feedback loop between the output of the amplifier and the junction between the two impedances of the first type, and in which two other impedances Z2a, Z2b of a second type, which have adjustable and substantially equal values, arranged respectively in the negative feedback loop and shunted with respect to the input of the amplifier. As shown the impedances of first type comprise variable resistors R1, and each of the impedances of second type comprises a capacitor C2 shunted by a variable resistor R2, the arrangement comprising a low-pass filter. In a second embodiment comprising a high-pass filter the two types of impedance are interchanged and the arrangement comprises the feedback path of a further amplifier 31, Fig. 3, with signal input E2 and output S2. Each of the variable resistors may comprise two fixed resistors connected in series, one of each pair being shunted with a switch which may comprise a field-effect transistor (Figs. 4, 6, not shown); each switch is operated at a frequency appreciably higher than the maximum frequency passed by the filter, the effective value of each resistor being determined by the mark/space ratio of the switching. Triangular wave generator and pulse width modulator.-A circuit for deriving the switching waveform comprises a triangular wave generator 39 and comparator 40, Fig. 8. The triangular wave generator 39 comprises a bi-stable circuit 47 the output 53 from which feeds amplifier 52 with capacitive feedback, forming an integrator. The output of integrator 52 is fed back to the out-of-phase input of a comparator 41 and the in-phase input of a second comparator 43. The in-phase input of comparator 41 is earthed and the out-of-phase input of comparator 43 connected to a source of positive supply: the outputs of the comparators are fed to the two inputs 48, 49 respectively, of bi-stable circuit 47. The triangular waveform produced is fed to the inphase input of comparator 40, to the out-of-phase input of which is supplied a control voltage V c1 : the output of comparator 40 comprises a rectangular pulse train the markspace ratio of which depends upon the value of the voltage V c1 (Fig. 11, not shown). Alternatively, numerical control means (Figs. 9, 12, not shown) may be used to energize the switching means, instead of an analogue arrangement. Speech synthesizer.-The filters are intended for use in a speech synthesizer. This comprises a variable frequency generator 1 and a white noise source 2, coupled to amplifiers 3, 4 and 5,6 respectively, which are of variable gain. Amplifier 3 feeds into a "nasal" channel comprising filter circuits 8-12 while amplifier 6 feeds into a noise channel comprising filters 16-18. The outputs from amplifiers 4, 5 are combined in a mixer 7 and fed to a "vocal" channel comprising filters 13-15. The outputs from filters 12, 15, 18 are combined in a mixer 19 and fed to reproducer 20. Filter circuits 8, 16 have transfer functions which contain a complex zero (anti-resonant circuits) while the remaining filters have a transfer function containing complex poles (resonant circuits).
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR6920702A FR2045207A5 (en) | 1969-06-20 | 1969-06-20 | |
DE19702030324 DE2030324A1 (en) | 1969-06-20 | 1970-06-19 | |
GB2993170A GB1308636A (en) | 1969-06-20 | 1970-08-19 | Electrical filters enabling independent control of resonance frequenc and of bandpass especially for a speech synthesizer |
FR7039299A FR2109514A6 (en) | 1969-06-20 | 1970-10-30 | |
GB4906071A GB1374624A (en) | 1969-06-20 | 1971-10-21 | Electrical filters enabling independent control of resonance or transition frequency and of band-pass especially for speech synth esizers |
DE19712153645 DE2153645A1 (en) | 1969-06-20 | 1971-10-27 | Electrical filters with independent control of the resonance or crossover frequency and bandwidth, especially for formant synthesizers of human speech |
US00194427A US3787778A (en) | 1969-06-20 | 1971-11-01 | Electrical filters enabling independent control of resonance of transisition frequency and of band-pass, especially for speech synthesizers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR6920702A FR2045207A5 (en) | 1969-06-20 | 1969-06-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2045207A5 true FR2045207A5 (en) | 1971-02-26 |
Family
ID=9036097
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR6920702A Expired FR2045207A5 (en) | 1969-06-20 | 1969-06-20 |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2030324A1 (en) |
FR (1) | FR2045207A5 (en) |
GB (1) | GB1308636A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1083533B (en) * | 1977-06-20 | 1985-05-21 | Cselt Centro Studi Lab Telecom | PROCEDURE AND DEVICE FOR THE GENERATION OF A VOICE TYPE SIGNAL FOR THE PERFORMANCE OF OBJECTIVE MEASUREMENTS OF EQUIPMENT PERFORMANCE PART OF VOICE SIGNAL TRANSMISSION SYSTEMS |
-
1969
- 1969-06-20 FR FR6920702A patent/FR2045207A5/fr not_active Expired
-
1970
- 1970-06-19 DE DE19702030324 patent/DE2030324A1/de active Pending
- 1970-08-19 GB GB2993170A patent/GB1308636A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2030324A1 (en) | 1970-12-23 |
GB1308636A (en) | 1973-02-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |