FR2501439A1 - Discriminateur de bande d'energie - Google Patents
Discriminateur de bande d'energie Download PDFInfo
- Publication number
- FR2501439A1 FR2501439A1 FR8203501A FR8203501A FR2501439A1 FR 2501439 A1 FR2501439 A1 FR 2501439A1 FR 8203501 A FR8203501 A FR 8203501A FR 8203501 A FR8203501 A FR 8203501A FR 2501439 A1 FR2501439 A1 FR 2501439A1
- Authority
- FR
- France
- Prior art keywords
- signal
- circuit
- energy
- filter
- energy band
- 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.)
- Granted
Links
- 238000012545 processing Methods 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 5
- 230000006978 adaptation Effects 0.000 abstract description 2
- 230000003595 spectral effect Effects 0.000 abstract 1
- 238000012546 transfer Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000002592 echocardiography Methods 0.000 description 3
- 238000009432 framing Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 208000004356 Hysteria Diseases 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 208000012839 conversion disease Diseases 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
- H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Filters That Use Time-Delay Elements (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/240,979 US4405840A (en) | 1981-03-05 | 1981-03-05 | Echo canceler far end energy discriminator |
| US06/240,978 US4426729A (en) | 1981-03-05 | 1981-03-05 | Partial band - whole band energy discriminator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2501439A1 true FR2501439A1 (fr) | 1982-09-10 |
| FR2501439B1 FR2501439B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1984-12-21 |
Family
ID=26933878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8203501A Granted FR2501439A1 (fr) | 1981-03-05 | 1982-03-03 | Discriminateur de bande d'energie |
Country Status (6)
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4468641A (en) * | 1982-06-28 | 1984-08-28 | At&T Bell Laboratories | Adaptive filter update normalization |
| US4467441A (en) * | 1982-10-08 | 1984-08-21 | At&T Bell Laboratories | Adaptive filter including controlled tap coefficient leakage |
| US4707824A (en) * | 1983-12-15 | 1987-11-17 | Nec Corporation | Method and apparatus for cancelling echo |
| EP0307765A1 (de) * | 1987-09-18 | 1989-03-22 | Siemens Aktiengesellschaft | Anordnung zum Erkennen periodischer Signale für einen Sprach-Echokompensator |
| DE69015193T2 (de) * | 1989-05-12 | 1995-05-04 | Gpt Ltd | Schaltung zur audiosignalverarbeitung. |
| GB2256351B (en) * | 1991-05-25 | 1995-07-05 | Motorola Inc | Enhancement of echo return loss |
| US5592548A (en) * | 1995-05-31 | 1997-01-07 | Qualcomm Incorporated | System and method for avoiding false convergence in the presence of tones in a time-domain echo cancellation process |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3937899A (en) * | 1975-01-30 | 1976-02-10 | Bell Telephone Laboratories, Incorporated | Tone detector using spectrum parameter estimation |
| US4028496A (en) * | 1976-08-17 | 1977-06-07 | Bell Telephone Laboratories, Incorporated | Digital speech detector |
| JPS5295912A (en) * | 1976-02-06 | 1977-08-12 | Nec Corp | Echo cancelling device |
| US4072830A (en) * | 1976-10-04 | 1978-02-07 | Bell Telephone Laboratories, Incorporated | Variable phase shifter for adaptive echo cancellers |
| US4129753A (en) * | 1977-12-09 | 1978-12-12 | Bell Telephone Laboratories, Incorporated | Echo canceller using feedback to improve speech detector performance |
| EP0021317A2 (en) * | 1979-06-21 | 1981-01-07 | Western Electric Company, Incorporated | Adaptive filter with TAP coefficient leakage |
| US4277645A (en) * | 1980-01-25 | 1981-07-07 | Bell Telephone Laboratories, Incorporated | Multiple variable threshold speech detector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3499999A (en) * | 1966-10-31 | 1970-03-10 | Bell Telephone Labor Inc | Closed loop adaptive echo canceller using generalized filter networks |
-
1982
- 1982-02-24 WO PCT/US1982/000228 patent/WO1982003144A1/en active Application Filing
- 1982-02-24 DE DE823235915T patent/DE3235915T1/de active Granted
- 1982-02-24 NL NL8220092A patent/NL8220092A/nl unknown
- 1982-03-03 FR FR8203501A patent/FR2501439A1/fr active Granted
- 1982-03-03 GB GB8206174A patent/GB2095519B/en not_active Expired
- 1982-03-04 IT IT19972/82A patent/IT1150253B/it active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3937899A (en) * | 1975-01-30 | 1976-02-10 | Bell Telephone Laboratories, Incorporated | Tone detector using spectrum parameter estimation |
| JPS5295912A (en) * | 1976-02-06 | 1977-08-12 | Nec Corp | Echo cancelling device |
| US4028496A (en) * | 1976-08-17 | 1977-06-07 | Bell Telephone Laboratories, Incorporated | Digital speech detector |
| US4072830A (en) * | 1976-10-04 | 1978-02-07 | Bell Telephone Laboratories, Incorporated | Variable phase shifter for adaptive echo cancellers |
| US4129753A (en) * | 1977-12-09 | 1978-12-12 | Bell Telephone Laboratories, Incorporated | Echo canceller using feedback to improve speech detector performance |
| EP0021317A2 (en) * | 1979-06-21 | 1981-01-07 | Western Electric Company, Incorporated | Adaptive filter with TAP coefficient leakage |
| US4277645A (en) * | 1980-01-25 | 1981-07-07 | Bell Telephone Laboratories, Incorporated | Multiple variable threshold speech detector |
Non-Patent Citations (1)
| Title |
|---|
| PATENTS ABSTRACTS OF JAPAN, vol. 1, no. 153, 8 dècembre 1977, page 8180 E 77; & JP - A - 52 95 912 (NIPPON DENKI K.K.) (08-12-1977) * |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1150253B (it) | 1986-12-10 |
| GB2095519A (en) | 1982-09-29 |
| DE3235915C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1987-06-19 |
| NL8220092A (nl) | 1983-02-01 |
| IT8219972A0 (it) | 1982-03-04 |
| WO1982003144A1 (en) | 1982-09-16 |
| DE3235915T1 (de) | 1983-11-17 |
| FR2501439B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1984-12-21 |
| GB2095519B (en) | 1985-05-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |