IT1150253B - ENERGY BAND DISCRIMINATOR - Google Patents
ENERGY BAND DISCRIMINATORInfo
- Publication number
- IT1150253B IT1150253B IT19972/82A IT1997282A IT1150253B IT 1150253 B IT1150253 B IT 1150253B IT 19972/82 A IT19972/82 A IT 19972/82A IT 1997282 A IT1997282 A IT 1997282A IT 1150253 B IT1150253 B IT 1150253B
- Authority
- IT
- Italy
- Prior art keywords
- energy band
- band discriminator
- discriminator
- energy
- band
- Prior art date
Links
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 |
---|---|---|---|
US06/240,978 US4426729A (en) | 1981-03-05 | 1981-03-05 | Partial band - whole band energy discriminator |
US06/240,979 US4405840A (en) | 1981-03-05 | 1981-03-05 | Echo canceler far end energy discriminator |
Publications (2)
Publication Number | Publication Date |
---|---|
IT8219972A0 IT8219972A0 (en) | 1982-03-04 |
IT1150253B true IT1150253B (en) | 1986-12-10 |
Family
ID=26933878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT19972/82A IT1150253B (en) | 1981-03-05 | 1982-03-04 | ENERGY BAND DISCRIMINATOR |
Country Status (6)
Country | Link |
---|---|
DE (1) | DE3235915T1 (en) |
FR (1) | FR2501439A1 (en) |
GB (1) | GB2095519B (en) |
IT (1) | IT1150253B (en) |
NL (1) | NL8220092A (en) |
WO (1) | WO1982003144A1 (en) |
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 (en) * | 1987-09-18 | 1989-03-22 | Siemens Aktiengesellschaft | Arrangement for detecting periodic signals for a speech echo canceller |
DE69015193T2 (en) * | 1989-05-12 | 1995-05-04 | Gpt Ltd | CIRCUIT FOR AUDIO SIGNAL PROCESSING. |
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 |
Family Cites Families (8)
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 |
US3937899A (en) * | 1975-01-30 | 1976-02-10 | Bell Telephone Laboratories, Incorporated | Tone detector using spectrum parameter estimation |
JPS5842663B2 (en) * | 1976-02-06 | 1983-09-21 | 日本電気株式会社 | echo canceller |
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 |
US4243959A (en) * | 1979-06-21 | 1981-01-06 | Bell Telephone Laboratories, Incorporated | Adaptive filter with tap coefficient leakage |
US4277645A (en) * | 1980-01-25 | 1981-07-07 | Bell Telephone Laboratories, Incorporated | Multiple variable threshold speech detector |
-
1982
- 1982-02-24 WO PCT/US1982/000228 patent/WO1982003144A1/en active Application Filing
- 1982-02-24 DE DE823235915T patent/DE3235915T1/en active Granted
- 1982-02-24 NL NL8220092A patent/NL8220092A/en unknown
- 1982-03-03 GB GB8206174A patent/GB2095519B/en not_active Expired
- 1982-03-03 FR FR8203501A patent/FR2501439A1/en active Granted
- 1982-03-04 IT IT19972/82A patent/IT1150253B/en active
Also Published As
Publication number | Publication date |
---|---|
FR2501439B1 (en) | 1984-12-21 |
GB2095519B (en) | 1985-05-22 |
WO1982003144A1 (en) | 1982-09-16 |
GB2095519A (en) | 1982-09-29 |
DE3235915C2 (en) | 1987-06-19 |
DE3235915T1 (en) | 1983-11-17 |
IT8219972A0 (en) | 1982-03-04 |
NL8220092A (en) | 1983-02-01 |
FR2501439A1 (en) | 1982-09-10 |
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