GB1146185A - Filter - Google Patents
FilterInfo
- Publication number
- GB1146185A GB1146185A GB2968566A GB2968566A GB1146185A GB 1146185 A GB1146185 A GB 1146185A GB 2968566 A GB2968566 A GB 2968566A GB 2968566 A GB2968566 A GB 2968566A GB 1146185 A GB1146185 A GB 1146185A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resonant circuit
- transistors
- filter
- series
- resonant
- 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
- 238000013016 damping Methods 0.000 abstract 3
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 abstract 1
- 230000005669 field 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
- H03H11/1291—Current or voltage controlled filters
-
- 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
- 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
- H03H11/1213—Frequency selective two-port networks using amplifiers with feedback using transistor 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)
- Filters And Equalizers (AREA)
Abstract
1,146,185. Vocoder; variable-bandwidth circuits. STANDARD TELEPHONES & CABLES Ltd. 1 July, 1966, No. 29685/66. Headings H3T and H4R. A speech synthesizer channel includes a resonant filter with an electronically variable damping resistor. Fig. 2 shows an embodiment of the filter which comprises a parallel resonant circuit including inductor L1 and capacitor C1 fed, via transistors Q3 and Q4, with pitch pulses or noise from the respective channel modulators, not shown. A transistor Q5 is connected in series with a resistor R1 so that critical damping is applied to the resonant circuit whenever Q5 conducts, which is arranged to occur for a short time immediately before each pitch pulse occurs, so that interference between successive pitch pulses is avoided. A further transistor Q6 is arranged in the resonant circuit and has an impedance dependent on the control voltage applied to its base so that the Q of the resonant circuit may be varied to affect the quality of the reproduced speech. The transistors Q5 and Q6 may be symmetrical transistors as shown or field effect transistors. In an alternative arrangement, Fig. 5 (not shown), a series resonant circuit is used and the variable damping may be applied to the secondary of a transformer whose primary forms the resonant circuit inductor. A resonant filter as described above may be provided in each channel of a vocoder synthesizer, Fig. 1 (not shown), or a number of filters, one for each formant, may be arranged in series, Fig. 11 (not shown), in an artificial speech synthesizer.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2968566A GB1146185A (en) | 1966-07-01 | 1966-07-01 | Filter |
US649518A US3551588A (en) | 1966-07-01 | 1967-06-28 | Vocoder filter system |
FR112708A FR1540969A (en) | 1966-07-01 | 1967-06-30 | Speech synthesizer |
BE717838D BE717838A (en) | 1966-07-01 | 1968-07-10 | speech synthesizer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2968566A GB1146185A (en) | 1966-07-01 | 1966-07-01 | Filter |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1146185A true GB1146185A (en) | 1969-03-19 |
Family
ID=10295476
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2968566A Expired GB1146185A (en) | 1966-07-01 | 1966-07-01 | Filter |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1146185A (en) |
-
1966
- 1966-07-01 GB GB2968566A patent/GB1146185A/en not_active Expired
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