GB1303808A - - Google Patents
Info
- Publication number
- GB1303808A GB1303808A GB1303808DA GB1303808A GB 1303808 A GB1303808 A GB 1303808A GB 1303808D A GB1303808D A GB 1303808DA GB 1303808 A GB1303808 A GB 1303808A
- Authority
- GB
- United Kingdom
- Prior art keywords
- formant
- discriminator
- channel
- reject
- output
- 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
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
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
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)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
1303808 Formant tracking vocoder PLESSEY CO Ltd 22 April 1970 [24 April 1969] 21000/69 Heading H4R In a formant tracking vocoder, Fig. 1, speech SP is fed to two channels to derive two formant frequencies of speech. Each channel includes a band stop filter F -1 or F -2 tuned to reject one formant frequency and a frequency discriminator F 2T or FIT to detect the frequency of the other formant. The output of the discriminators in each channel are utilized to tune the band stop filter in the other channel to reject the appropriate formant. A third channel may be provided including two band stop filters F -11 and F -22 to reject the two formants, each being tuned by the appropriate discriminator output, in order to provide a signal in which the pitch frequency can easily be determined by discriminator C 0 . Each formant discriminator may include a band reject filter with a phase sensitive detector connected between input and output with the integrated output of the detector controlling the filter tuning, and providing the discriminator output. In this arrangement the output from the band reject filter is a suitable signal from which the pitch frequency can be determined. Three formant tracker, Fig. 4.-The channel which includes the filter F -2 to reject the middle formant is fed to low pass and high pass filters LP1 and HP1 in order to separate out the lowest and highest frequency formants which are detected by respective discriminators. The outputs from these discriminators control respective filters F -1 and F -3 in the other channel in order to detect the middle formant. The three discriminator outputs control band stop filters F -11 , F -22 and F -33 in the pitch discriminator channel.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2100069 | 1969-04-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1303808A true GB1303808A (en) | 1973-01-24 |
Family
ID=10155483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1303808D Expired GB1303808A (en) | 1969-04-24 | 1969-04-24 |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE2019280C3 (en) |
FR (1) | FR2046471A5 (en) |
GB (1) | GB1303808A (en) |
SE (1) | SE365890B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3808370A (en) * | 1972-08-09 | 1974-04-30 | Rockland Systems Corp | System using adaptive filter for determining characteristics of an input |
US3989896A (en) * | 1973-05-08 | 1976-11-02 | Westinghouse Electric Corporation | Method and apparatus for speech identification |
-
1969
- 1969-04-24 GB GB1303808D patent/GB1303808A/en not_active Expired
-
1970
- 1970-04-22 DE DE19702019280 patent/DE2019280C3/en not_active Expired
- 1970-04-23 SE SE563270A patent/SE365890B/xx unknown
- 1970-04-24 FR FR7015005A patent/FR2046471A5/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2019280A1 (en) | 1970-11-12 |
FR2046471A5 (en) | 1971-03-05 |
DE2019280B2 (en) | 1979-02-15 |
DE2019280C3 (en) | 1979-10-04 |
SE365890B (en) | 1974-04-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1421370A (en) | Band pass filter circuitry | |
FR2046471A5 (en) | ||
US3008043A (en) | Communications receiver | |
ES418059A1 (en) | Waveguide frequency multiplier | |
JPS5731235A (en) | Receiving system | |
GB1250393A (en) | ||
GB1430142A (en) | Automatic frequency control loop apparatus | |
GB1139017A (en) | Speech analysis system | |
GB1436623A (en) | Signalling receiver | |
JPS5797758A (en) | Multifrequency signal receiver | |
JPS52140219A (en) | Tuner unit | |
JPS5769949A (en) | Stereo signal reproducing circuit | |
GB862132A (en) | Frequency discrimination system of voice formant | |
JPS57155866A (en) | Demodulation circuit for intermediate frequency signal | |
GB1142426A (en) | Decoder | |
GB1526928A (en) | Frequency synthesisers | |
GB1533432A (en) | Fm tuner | |
JPS5741018A (en) | Dynamic tracking filter of injection synchronizing oscillator type | |
GB1281331A (en) | Method of radio transmission of signals unaffected by interference | |
GB1113225A (en) | Apparatus for distinguishing between voiced and unvoiced sounds in a speech signal | |
JPS5585145A (en) | Phase synchronizer | |
GB1083386A (en) | Improvements in and relating to electric signal apparatus | |
JPS5731236A (en) | Frequency converting and amplifying circuit | |
SU694819A1 (en) | Apparatus for measuring superhigh frequency power | |
JPS51138363A (en) | Band-pass filter using a piezoelectric tunig furk |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |