RU94028666A - Сетевой эхо-подавитель - Google Patents
Сетевой эхо-подавительInfo
- Publication number
- RU94028666A RU94028666A RU94028666/09A RU94028666A RU94028666A RU 94028666 A RU94028666 A RU 94028666A RU 94028666/09 A RU94028666/09 A RU 94028666/09A RU 94028666 A RU94028666 A RU 94028666A RU 94028666 A RU94028666 A RU 94028666A
- Authority
- RU
- Russia
- Prior art keywords
- signal
- control
- echo
- control state
- level
- Prior art date
Links
- 238000002592 echocardiography Methods 0.000 title claims 25
- 230000001629 suppression Effects 0.000 title claims 9
- 230000002194 synthesizing Effects 0.000 claims 2
- 241001442055 Vipera berus Species 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000011156 evaluation Methods 0.000 claims 1
- 238000003786 synthesis reaction Methods 0.000 claims 1
Claims (8)
1. Эхо-подавитель для подавления в сигнале обратного канала отраженного сигнала приемного канала, в котором отраженный сигнал приемного канала объединяется посредством канала эхо-сигнала с входным сигналом обратного канала, содержащий первый фильтр для генерирования коэффициентов первого фильтра, генерирования первого сигнала оценки эхо-сигнала на основе коэффициентов первого фильтра и для обновления коэффициентов первого фильтра в ответ на сигнал управления режимом работы первого фильтра, первое суммирующее устройство для вычитания первого сигнала оценки эхо-сигнала из объединенного сигнала обратного канала и канала приема эхо-сигнала с целью последующей выдачи первого остаточного эхо-сигнала, второй фильтр для генерирования коэффициентов второго фильтра, генерирования второго сигнала оценки эхо-сигнала на основе коэффициентов второго фильтра и для обновления коэффициентов второго фильтра в ответ на сигнал управления режимом работы второго фильтра, второе суммирующее устройство для вычитания второго сигнала оценки эхо-сигнала из объединенного сигнала с последующим генерированием второго остаточного эхо-сигнала и для подачи в обратный канал второго остаточного эхо-сигнала, средство управления для определения на основе сигнала приемного канала, объединенного сигнала и на основе первого и второго остаточных эхо-сигналов одного из множества состояний управления, отличающееся тем, что первое состояние управления указывает на то, что сигнал приемного канала будет выше первого заданного уровня энергии, что при нахождении средства управления в первом состоянии управления оно образует и выдает первый сигнал управления, а второй сигнал управления образуется и выдается тогда, когда по меньшей мере первое отношение энергии первого остаточного эхо-сигнала и объединенного сигнала или второе отношение энергии второго остаточного эхо-сигнала и объединенного сигнала превышают первый заданный уровень отношения энергии.
2. Эхо-подавитель по п.1, отличающийся тем, что средство управления при его нахождении в первом состоянии управления будет определять первый заданный уровень отношения энергии посредством определения, будет ли второе отношение энергии больше суммы первого порогового значения и первого заданного фиксированного значения и если это так, первый заданный уровень отношения энергий устанавливается на большее из величин первого порогового значения и разности второго отношения энергий и первого заданного фиксированного значения, а если второе отношение энергии будет меньше суммы первого порогового значения и первого заданного фиксированного значения, то первый заданный уровень отношения энергий устанавливается на второе заданное фиксированное значение, если второе отношение энергий меньше разности между вторым заданным фиксированным значением и третьим заданным фиксированным значением.
3. Эхо-подавитель по п.1, отличающийся тем, что средство управления дополнительно определяет второе состояние управления из множества состояний управления, при этом второе состояние управления указывает на то, что уровень входного сигнала обратного канала будет выше второго заданного уровня энергии, а при нахождении средства управления в своем втором состоянии управления исключается возможность генерирования как первого, так и второго сигналов управления.
4. Эхо-подавитель по п.1, отличающийся тем, что средство управления дополнительно определяет второе состояние управления из множества состояний управления, при этом второе состояние управления указывает на то, что уровень сигнала приемного канала выше первого заданного уровня энергии, а уровень входного сигнала обратного канала выше второго заданного уровня энергии, причем при нахождении средства управления в своем втором состоянии управления происходит генерирование первого сигнала управления.
5. Эхо-подавитель по п.4, отличающийся тем, что при нахождении средства управления в своем втором состоянии управления происходит генерирование первого сигнала управления в тот момент, когда отношение энергий сигнала приемного канала и объединенного сигнала будет больше третьего заданного уровня отношения энергий.
6. Эхо-подавитель по п.1, отличающийся тем, что дополнительно содержит выходное устройство для генерирования сигнала шума, который будет заменять второй остаточный эхо-сигнал в обратном канале в ответ на сигнал выбора шума, а также тем, что при нахождении средства управления в своем первом состоянии управления происходит генерирование сигнала выбора шума.
7. Эхо-подавитель по п.6, отличающийся тем, что при нахождении средства управления в своем первом состоянии управления происходит генерирование сигнала выбора шума в тот момент, когда отношение энергий сигнала приемного канала и объединенного сигнала будет больше третьего заданного уровня отношения энергии.
8. Эхо-подавитель по п.7, отличающийся тем, что средство управления дополнительно определяет второе состояние управления в упомянутом множестве состояний управления, причем второе состояние управления указывает на то, что как сигнал приемного канала, так и входной сигнал обратного канала будут соответственно ниже второго и третьего заданных уровней энергии, а при нахождении средства управления в своем втором состоянии управления исключается возможность генерирования первого и второго сигналов управления, а также тем, что выходное устройство содержит средство анализа шума, чтобы при нахождении средства управления в своем втором состоянии управления выполнить анализ кодированием по методу линейного предсказания второго остаточного эхо-сигнала и обеспечить вывод результатов анализа, средство синтеза шума для приема выходного сигнала с результатами анализа и для синтезирования сигнала шума, представляющего собой второй остаточный эхо-сигнал, и переключающее средство для подачи второго остаточного эхо-сигнала по обратному каналу, причем переключающее средство реагирует на сигнал выбора шума, чтобы обеспечить своевременную замену второго остаточного эхо-сигнала сигналом шума.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US951,074 | 1978-10-13 | ||
US07/951,074 US5307405A (en) | 1992-09-25 | 1992-09-25 | Network echo canceller |
PCT/US1993/009112 WO1994008418A1 (en) | 1992-09-25 | 1993-09-24 | Network echo canceller |
Publications (2)
Publication Number | Publication Date |
---|---|
RU94028666A true RU94028666A (ru) | 1997-11-10 |
RU2109408C1 RU2109408C1 (ru) | 1998-04-20 |
Family
ID=25491228
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
RU94028666A RU2109408C1 (ru) | 1992-09-25 | 1993-09-24 | Сетевой эхоподавитель |
Country Status (25)
Country | Link |
---|---|
US (4) | US5307405A (ru) |
EP (3) | EP1119172B1 (ru) |
JP (2) | JP3447735B2 (ru) |
KR (1) | KR100284202B1 (ru) |
CN (1) | CN1041374C (ru) |
AT (1) | ATE209837T1 (ru) |
AU (1) | AU660243B2 (ru) |
BG (1) | BG61985B1 (ru) |
BR (1) | BR9305647A (ru) |
CA (1) | CA2123002C (ru) |
CZ (1) | CZ288667B6 (ru) |
DE (1) | DE69331223T2 (ru) |
ES (1) | ES2398091T3 (ru) |
FI (1) | FI110346B (ru) |
HK (1) | HK1015215A1 (ru) |
HU (1) | HU215224B (ru) |
IL (1) | IL107100A (ru) |
MX (1) | MX9305889A (ru) |
NO (1) | NO309835B1 (ru) |
PL (1) | PL173748B1 (ru) |
RO (1) | RO114392B1 (ru) |
RU (1) | RU2109408C1 (ru) |
SK (1) | SK282101B6 (ru) |
WO (1) | WO1994008418A1 (ru) |
ZA (1) | ZA936322B (ru) |
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DE3585034D1 (de) * | 1985-10-30 | 1992-02-06 | Ibm | Verfahren zur bestimmung einer flachen echopfadverzoegerung und dieses verfahren verwendender echokompensator. |
CA1242541A (en) * | 1985-11-25 | 1988-09-27 | Dany Sylvain | Echo cancellation in two-wire transmission path repeaters |
US4697261A (en) * | 1986-09-05 | 1987-09-29 | M/A-Com Government Systems, Inc. | Linear predictive echo canceller integrated with RELP vocoder |
US4845746A (en) * | 1987-06-23 | 1989-07-04 | Rockwell International Corporation | Echo canceller with relative feedback control |
NL8701633A (nl) * | 1987-07-10 | 1989-02-01 | Philips Nv | Digitale echocompensator. |
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JP2792252B2 (ja) * | 1991-03-14 | 1998-09-03 | 日本電気株式会社 | 多チャンネルエコー除去方法および装置 |
EP0518383B1 (en) * | 1991-06-13 | 1997-09-03 | Nec Corporation | Method and arrangement of echo elimination in digital telecommunications system |
JP3065133B2 (ja) * | 1991-08-21 | 2000-07-12 | 富士通株式会社 | ジッタ補償装置 |
US5274705A (en) * | 1991-09-24 | 1993-12-28 | Tellabs Inc. | Nonlinear processor for an echo canceller and method |
US5307405A (en) * | 1992-09-25 | 1994-04-26 | Qualcomm Incorporated | Network echo canceller |
-
1992
- 1992-09-25 US US07/951,074 patent/US5307405A/en not_active Expired - Lifetime
-
1993
- 1993-08-27 ZA ZA936322A patent/ZA936322B/xx unknown
- 1993-09-23 IL IL10710093A patent/IL107100A/en not_active IP Right Cessation
- 1993-09-24 RU RU94028666A patent/RU2109408C1/ru active
- 1993-09-24 DE DE69331223T patent/DE69331223T2/de not_active Expired - Lifetime
- 1993-09-24 EP EP01110152A patent/EP1119172B1/en not_active Expired - Lifetime
- 1993-09-24 AT AT93923128T patent/ATE209837T1/de not_active IP Right Cessation
- 1993-09-24 HU HU9401313A patent/HU215224B/hu not_active IP Right Cessation
- 1993-09-24 ES ES01110152T patent/ES2398091T3/es not_active Expired - Lifetime
- 1993-09-24 SK SK606-94A patent/SK282101B6/sk not_active IP Right Cessation
- 1993-09-24 MX MX9305889A patent/MX9305889A/es unknown
- 1993-09-24 PL PL93303792A patent/PL173748B1/pl not_active IP Right Cessation
- 1993-09-24 KR KR1019940701785A patent/KR100284202B1/ko not_active IP Right Cessation
- 1993-09-24 WO PCT/US1993/009112 patent/WO1994008418A1/en active IP Right Grant
- 1993-09-24 CZ CZ19941271A patent/CZ288667B6/cs not_active IP Right Cessation
- 1993-09-24 BR BR9305647A patent/BR9305647A/pt not_active IP Right Cessation
- 1993-09-24 EP EP01116676A patent/EP1152547A3/en not_active Withdrawn
- 1993-09-24 RO RO94-00874A patent/RO114392B1/ro unknown
- 1993-09-24 EP EP93923128A patent/EP0615674B1/en not_active Expired - Lifetime
- 1993-09-24 AU AU52918/93A patent/AU660243B2/en not_active Ceased
- 1993-09-24 JP JP50919794A patent/JP3447735B2/ja not_active Expired - Lifetime
- 1993-09-24 CA CA002123002A patent/CA2123002C/en not_active Expired - Lifetime
- 1993-09-25 CN CN93118294A patent/CN1041374C/zh not_active Expired - Lifetime
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1994
- 1994-02-28 US US08/202,520 patent/US5559881A/en not_active Expired - Lifetime
- 1994-05-18 BG BG98780A patent/BG61985B1/bg unknown
- 1994-05-20 NO NO19941904A patent/NO309835B1/no not_active IP Right Cessation
- 1994-05-25 FI FI942443A patent/FI110346B/fi not_active IP Right Cessation
-
1996
- 1996-02-23 US US08/607,403 patent/US5687229A/en not_active Expired - Lifetime
- 1996-02-23 US US08/607,402 patent/US5646991A/en not_active Expired - Lifetime
-
1998
- 1998-12-28 HK HK98116165A patent/HK1015215A1/xx not_active IP Right Cessation
-
2001
- 2001-06-05 JP JP2001170009A patent/JP4282915B2/ja not_active Expired - Lifetime
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