CA1117431A - Syllabic compander with logarithmic chain - Google Patents
Syllabic compander with logarithmic chainInfo
- Publication number
- CA1117431A CA1117431A CA000329761A CA329761A CA1117431A CA 1117431 A CA1117431 A CA 1117431A CA 000329761 A CA000329761 A CA 000329761A CA 329761 A CA329761 A CA 329761A CA 1117431 A CA1117431 A CA 1117431A
- Authority
- CA
- Canada
- Prior art keywords
- output
- expander
- compressor
- average value
- logarithmic
- 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
- 230000006835 compression Effects 0.000 claims abstract description 33
- 238000007906 compression Methods 0.000 claims abstract description 33
- 230000006854 communication Effects 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 10
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 238000012935 Averaging Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001702 transmitter Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
- H03G7/002—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
- H04B1/64—Volume compression or expansion arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US919,655 | 1978-06-28 | ||
| US05/919,655 US4250470A (en) | 1978-06-28 | 1978-06-28 | Syllabic compander with logarithmic chain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1117431A true CA1117431A (en) | 1982-02-02 |
Family
ID=25442421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000329761A Expired CA1117431A (en) | 1978-06-28 | 1979-06-14 | Syllabic compander with logarithmic chain |
Country Status (9)
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4430626A (en) | 1979-11-28 | 1984-02-07 | Dbx, Inc. | Networks for the log domain |
| EP0042460A1 (en) * | 1980-06-20 | 1981-12-30 | Hughes Aircraft Company | Homomorphic automatic gain control |
| AU551633B2 (en) * | 1980-11-27 | 1986-05-08 | Sony Corporation | Signal level detecting circuit |
| US4377792A (en) * | 1981-03-26 | 1983-03-22 | Dbx, Inc. | Compander system |
| US4434440A (en) | 1981-11-24 | 1984-02-28 | Rca Corporation | FM/TV Transmission system |
| US4536846A (en) * | 1982-09-20 | 1985-08-20 | Rca Corporation | Distortion reducer for companded analog systems |
| US4609878A (en) * | 1983-01-24 | 1986-09-02 | Circuit Research Labs, Inc. | Noise reduction system |
| DE3414632A1 (de) * | 1984-04-18 | 1985-10-24 | Telefunken Fernseh Und Rundfunk Gmbh, 3000 Hannover | Verfahren und schaltung zur verarbeitung von in ihrer dynamik vorbestimmt veraenderten signalen, insbesondere fuer audio-signale |
| GB8701365D0 (en) * | 1987-01-22 | 1987-02-25 | Thomas L D | Signal level control |
| CA1309665C (en) * | 1987-06-27 | 1992-11-03 | Kenzo Akagiri | Amplitude compressing/expanding circuit |
| JPH01143513A (ja) * | 1987-11-30 | 1989-06-06 | Matsushita Electric Ind Co Ltd | 信号レベル圧縮，伸長装置 |
| JP2692843B2 (ja) * | 1988-03-31 | 1997-12-17 | 株式会社東芝 | 除算器 |
| US4839906A (en) * | 1988-05-20 | 1989-06-13 | Amaf Industries, Inc. | Processor based linked compressor-expander telecommunications system |
| US5065451A (en) * | 1989-06-09 | 1991-11-12 | Amaf Industries, Inc. | System and method of frequency calibration in a linked compression-expansion (lincompex) system |
| US5530767A (en) * | 1993-12-28 | 1996-06-25 | Nec Corporation | Reception volume limiting circuit |
| US5845216A (en) * | 1995-05-30 | 1998-12-01 | Sierra Wireless, Inc. | Optimized companding for communication over cellular systems |
| US5892834A (en) * | 1997-06-30 | 1999-04-06 | Ford Motor Company | Audio level dynamic range compression |
| US6556685B1 (en) * | 1998-11-06 | 2003-04-29 | Harman Music Group | Companding noise reduction system with simultaneous encode and decode |
| US7233624B2 (en) * | 2002-06-11 | 2007-06-19 | Interdigital Technology Corporation | Method and system for all digital gain control |
| JP4783319B2 (ja) * | 2007-03-27 | 2011-09-28 | 日本電信電話株式会社 | ダイナミックレンジスケール回路 |
| ITTO20130292A1 (it) * | 2013-04-11 | 2014-10-12 | Inst Rundfunktechnik Gmbh | Verbesserter dynamikkompressor mit "release" - eigenschaft |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1243974A (en) * | 1967-08-12 | 1971-08-25 | Emi Ltd | Improvements in split-band compansion systems for sound recording or transmission |
| US3789143A (en) * | 1971-03-29 | 1974-01-29 | D Blackmer | Compander with control signal logarithmically related to the instantaneous rms value of the input signal |
| DE2425552A1 (de) * | 1974-04-09 | 1975-12-11 | Pan Atlantic Research & Dev Lt | Schaltung zur dynamischen kompression und dynamischen expansion von tonfrequenzsignalen |
-
1978
- 1978-06-28 US US05/919,655 patent/US4250470A/en not_active Expired - Lifetime
-
1979
- 1979-02-13 DE DE19792905428 patent/DE2905428A1/de active Granted
- 1979-02-27 IT IT67426/79A patent/IT1165635B/it active
- 1979-02-28 NL NLAANVRAGE7901606,A patent/NL188066C/xx not_active IP Right Cessation
- 1979-04-18 FR FR7909793A patent/FR2430132A1/fr active Granted
- 1979-06-07 GB GB7919848A patent/GB2024573B/en not_active Expired
- 1979-06-13 SE SE7905187A patent/SE437594B/sv not_active IP Right Cessation
- 1979-06-14 CA CA000329761A patent/CA1117431A/en not_active Expired
- 1979-06-28 JP JP54081992A patent/JPS6011855B2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2430132B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1984-06-15 |
| GB2024573B (en) | 1982-07-14 |
| NL7901606A (nl) | 1980-01-03 |
| NL188066C (nl) | 1992-03-16 |
| JPS5530294A (en) | 1980-03-04 |
| SE7905187L (sv) | 1979-12-29 |
| SE437594B (sv) | 1985-03-04 |
| IT1165635B (it) | 1987-04-22 |
| IT7967426A0 (it) | 1979-02-27 |
| JPS6011855B2 (ja) | 1985-03-28 |
| DE2905428A1 (de) | 1980-01-10 |
| GB2024573A (en) | 1980-01-09 |
| NL188066B (nl) | 1991-10-16 |
| DE2905428C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1990-05-03 |
| FR2430132A1 (fr) | 1980-01-25 |
| US4250470A (en) | 1981-02-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |