GB8910981D0 - Digital waveform encoder and generator - Google Patents
Digital waveform encoder and generatorInfo
- Publication number
- GB8910981D0 GB8910981D0 GB8910981A GB8910981A GB8910981D0 GB 8910981 D0 GB8910981 D0 GB 8910981D0 GB 8910981 A GB8910981 A GB 8910981A GB 8910981 A GB8910981 A GB 8910981A GB 8910981 D0 GB8910981 D0 GB 8910981D0
- Authority
- GB
- United Kingdom
- Prior art keywords
- wavefunction
- generator
- dacs
- waveform
- segments
- 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
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)
- Analogue/Digital Conversion (AREA)
Abstract
A waveform encoder has an input (12), a clock generator (30, 34) and respective detectors (14, 18, 26) for detecting maxima, minima and zeros in the waveform. During encoding, values of alternate maxima and minima are combined with associated timing information, and stored as a digital signal in a memory (42, 46). The waveform generator includes a variable wavefunction generator (55, 56, 62, 64, 76, 78, 50, 48, 72, 80, 70, 82) for generating segments of a predetermined wavefunction of period determined by the timing information and of amplitude determined by values of consecutive maxima and minima. The wavefunction can be a cosine wave. The output waveform is generated by joining together consecutive segments. The wavefunction segments are produced in the wavefunction generator by output DACs (70, 72) fed from PROMS (78, 76) containing values of sampled points representing the predetermined wavefunction. Reference DACs (64, 66) are fed alternately with amplitude levels between which the segments extend, and the reference DACs control the output levels of the output DACs.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8910981A GB8910981D0 (en) | 1989-05-12 | 1989-05-12 | Digital waveform encoder and generator |
| AU57301/90A AU5730190A (en) | 1989-05-12 | 1990-05-11 | Digital waveform encoder and generator |
| PCT/GB1990/000732 WO1990013890A1 (en) | 1989-05-12 | 1990-05-11 | Digital waveform encoder and generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8910981A GB8910981D0 (en) | 1989-05-12 | 1989-05-12 | Digital waveform encoder and generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB8910981D0 true GB8910981D0 (en) | 1989-06-28 |
Family
ID=10656661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8910981A Pending GB8910981D0 (en) | 1989-05-12 | 1989-05-12 | Digital waveform encoder and generator |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU5730190A (en) |
| GB (1) | GB8910981D0 (en) |
| WO (1) | WO1990013890A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE469576B (en) * | 1992-03-17 | 1993-07-26 | Televerket | PROCEDURE AND DEVICE FOR SYNTHESIS |
| FR2697388B1 (en) * | 1992-10-22 | 1994-12-09 | Eurodat | Method and device for dynamic analog / digital and digital / analog conversion. |
| DE10042005A1 (en) * | 2000-08-26 | 2002-03-07 | Bosch Gmbh Robert | Method and device for recording scanned information, in particular operating data of a motor vehicle |
| US10020008B2 (en) | 2013-05-23 | 2018-07-10 | Knowles Electronics, Llc | Microphone and corresponding digital interface |
| KR20160010606A (en) | 2013-05-23 | 2016-01-27 | 노우레스 일렉트로닉스, 엘엘시 | Vad detection microphone and method of operating the same |
| US20180317019A1 (en) | 2013-05-23 | 2018-11-01 | Knowles Electronics, Llc | Acoustic activity detecting microphone |
| CN106104686B (en) * | 2013-11-08 | 2019-12-31 | 美商楼氏电子有限公司 | Method in a microphone, microphone assembly, microphone arrangement |
| US10045140B2 (en) | 2015-01-07 | 2018-08-07 | Knowles Electronics, Llc | Utilizing digital microphones for low power keyword detection and noise suppression |
| US11289062B2 (en) | 2018-10-09 | 2022-03-29 | Second Sound, LLC | Fundamental frequency detection using peak detectors with frequency-controlled decay time |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2953644A (en) * | 1956-10-04 | 1960-09-20 | Bell Telephone Labor Inc | Wave transmission system |
| FR2252799A5 (en) * | 1973-11-26 | 1975-06-20 | Commissariat Energie Atomique | Automatic recording and synthesis of speech - uses time interval sectioner for speech amplitude signals with analogue-digital-analogue conversion |
| US4238831A (en) * | 1978-09-01 | 1980-12-09 | Westinghouse Air Brake Company | Pulse interpolation method and apparatus |
| DE3329208A1 (en) * | 1983-08-12 | 1985-02-28 | H. Dipl.-Phys. 7801 Umkirch Kusch | Method for data reduction of speech signals |
| US4680797A (en) * | 1984-06-26 | 1987-07-14 | The United States Of America As Represented By The Secretary Of The Air Force | Secure digital speech communication |
| US5136652A (en) * | 1985-11-14 | 1992-08-04 | Ncr Corporation | Amplitude enhanced sampled clipped speech encoder and decoder |
| EP0329403A3 (en) * | 1988-02-16 | 1990-04-11 | Integrated Circuit Technologies Ltd | Method and apparatus for analysing and reconstructing an analogue signal |
-
1989
- 1989-05-12 GB GB8910981A patent/GB8910981D0/en active Pending
-
1990
- 1990-05-11 WO PCT/GB1990/000732 patent/WO1990013890A1/en unknown
- 1990-05-11 AU AU57301/90A patent/AU5730190A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU5730190A (en) | 1990-11-29 |
| WO1990013890A1 (en) | 1990-11-15 |
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