RU93058657A - Вокодер с переменной скоростью кодирования и передачи данных - Google Patents
Вокодер с переменной скоростью кодирования и передачи данныхInfo
- Publication number
- RU93058657A RU93058657A RU93058657/09A RU93058657A RU93058657A RU 93058657 A RU93058657 A RU 93058657A RU 93058657/09 A RU93058657/09 A RU 93058657/09A RU 93058657 A RU93058657 A RU 93058657A RU 93058657 A RU93058657 A RU 93058657A
- Authority
- RU
- Russia
- Prior art keywords
- frame
- speed
- speech signal
- tone
- codebook
- Prior art date
Links
- 230000000694 effects Effects 0.000 claims 12
- 230000000875 corresponding Effects 0.000 claims 9
- 230000005284 excitation Effects 0.000 claims 5
- 238000001914 filtration Methods 0.000 claims 3
- 230000005540 biological transmission Effects 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 238000003786 synthesis reaction Methods 0.000 claims 2
- 230000002194 synthesizing Effects 0.000 claims 2
- 230000003044 adaptive Effects 0.000 claims 1
Claims (10)
1. Способ сжатия речевого сигнала путем кодирования с переменной скоростью кадров оцифрованных выборок речевого сигнала, отличающийся тем, что определяют уровень активности речевого сигнала для кадра оцифрованных выборок речевого сигнала, выбирают скорость кодирования из гpуппы скоростей в соответствии с указанным определенным уровнем активности речевого сигнала в пределах указанного кадра, кодируют этот кадр в соответствии с заранее определенным форматом кодирования для выбранной скорости, при этом каждая скорость имеет соответствующий, отличный от других, формат кодирования, и формируют для данного кадра соответствующий пакет выходных данных с выбранной скоростью.
2. Способ по п. 1, отличающийся тем, что при определении уровня активности речевого сигнала формируют по меньшей мере один пороговый уровень активности речевого сигнала, сравнивают уровень активности речевого сигнала для кадра с указанным по меньшей мере одним пороговым уровнем активности речевого сигнала, формируют индикацию превышения уровнем активности речевого сигнала для кадра соответствующего порогового уровня активности речевого сигнала и адаптивно подстраивают по меньшей мере один пороговый уровень активности речевого сигнала относительно уровня активности предыдущего кадра оцифрованных выборок речевого сигнала.
3. Способ по п. 1 или 2, отличающийся тем, что дополнительно формируют команду скорости, указывающую на требуемую скорость кодирования для данного кадра, и изменяют выбранную скорость кодирования так, что получают требуемую скорость кодирования для кодирования данного кадра с этой скоростью.
4. Способ по пп. 1-3, отличающийся тем, что указанная требуемая скорость меньше, чем максимальная скорость, и тем, что дополнительно формируют дополнительный пакет данных и объединяют пакет выходных данных с дополнительным пакетом данных в пределах передаваемого кадра для передачи.
5. Способ кодирования с переменной скоростью входных кадров оцифрованных выборок акустического сигнала, содержащего, в основном, речевой сигнал и фоновый шум, в кодере, использующем кодирование с линейным предсказанием с кодовым возбуждением, включающий вычисление коэффициентов кодирования с линейным предсказанием (ЛПК) для каждого кадра последовательности выходных кадров оцифрованных выборок речевого сигнала, отличающийся тем, что для каждого кадра выбирают скорость пакета выходных данных из группы скоростей пакетов данных в соответствии по меньшей мере с одним из коэффициентов ЛПК, ограничивают число битов, представляющих коэффициенты ЛПК, заранее определенным числом, зависящим от выбранной скорости, определяют параметры тона для каждого подкадра тона из группы анализируемых подкадров тона каждого кадра, число которых для каждого кадра определяется выбранной скоростью, причем параметры тона для каждого подкадра тона представлены числом битов, опpеделяемым выбранной скоростью, опpеделяют параметры кодового словаря для каждого подкадра кодового словаря из группы анализируемых подкадров кодового словаря каждого кадра, число которых для каждого кадра определяется выбранной скоростью, причем параметры кодового словаря для каждого подкадра кодового словаря представлены числом битов, определяемым выбранной скоростью, и для каждого кадра формируют соответствующий пакет битов выходных данных, представляющих коэффициенты ЛПК и параметры тона и кодового словаря, для каждого подкадра тона и кодового словаря соответственно.
6. Устройство для сжатия акустического сигнала в цифровые данные, имеющие переменную скорость, отличающееся тем, что оно содержит средства определения уровня активности звука для входного кадра оцифрованных выборок акустического сигнала. средства выбора скорости выходных данных из группы скоростей в соответствии с определенным уровнем активности звука в пределах данного кадра, средства кодирования кадра в соответствии с заранее определенным форматом кодирования для выбранной скорости, причем каждая скорость имеет соответствующий, отличный от других, формат кодирования, и средства формирования для кадра соответствующего пакета выходных данных со скоростью, соответствующей выбранной скорости.
7. Кодер для кодирования с переменной скоростью методом линейного предсказания с кодовым возбуждением входных кадров оцифрованных выборок акустического сигнала, включающего, в основном, речевой сигнал и фоновый шум, содержащий средства вычисления коэффициентов кодирования с линейным предсказанием (ЛПК) для каждого кадра из последовательности входных кадров оцифрованных выборок акустического сигнала, отличающийся тем, что он дополнительно содержит средства выбора для каждого кадра скорости пакета выходных данных из группы скоростей пакета данных в соответствии по меньшей мере с одним из коэффициентов ЛПК средства ограничения числа битов, представляющих коэффициенты ЛПК, заранее определенным числом, зависящим от выбранной скорости, средства определения параметров тона для каждого подкадра тона из группы анализируемых подкадров тона каждого кадра, число которых для каждого кадра определяется выбранной скоростью, причем параметры тона для каждого подкадра тона представлены числом битов, определяемым выбранной скоростью, и средства определения параметров кодового словаря для каждого подкадра кодового словаря из группы анализируемых подкадров кодового словаря каждого кадра, число которых для каждого кадра определяется выбранной скоростью, причем параметры кодового словаря для каждого подкадра кодового словаря представлены числом битов, определяемым выбранной скоростью. при этом для каждого кадра формируется соответствующий пакет битов выходных данных с выбранной скоростью, коэффициенты ЛПК и указанные параметры тона и кодового словаря для каждого подкадра тона и кодового словаря соответственно.
8. Декодер для декодирования закодированных с переменной скоростью методом линейного предсказания с кодовым возбуждением кадров оцифрованных выборок акустического сигнала, включающего, в основном, речевой сигнал и фоновый шум, для получения соответствующих кадров восстановленных выборок, отличающийся тем, что он содержит средства формирования соответствующего вектора возбуждения кодового словаря из принятых параметров индекса кодового словаря, средства усиления вектора возбуждения кодового словаря в соответствии с принятыми параметрами усиления кодового словаря для получения тонового остатка, средства синтеза тона для фильтрации тонового остатка в соответствии с принятыми значениями задержки и усиления тона с получением формантного остатка и средства синтеза форманты для фильтрации формантного остатка с получением восстановленных выборок речевого сигнала для данного кадра.
9. Декодер по п. 8, отличающийся тем, что он дополнительно содержит средства адаптивной фильтрации восстановленных выборок речевого сигнала для уменьшения в них слышимого шума и средства формирования коэффициента передачи, равного единице, между восстановленными выборками речевого сигнала и адаптивно отфильтрованными восстановленными выборками речевого сигнала.
10. Декодер по п. 8 или 9, отличающийся тем, что ошибки в принятых параметрах замаскированы при восстановлении речевого сигнала.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US71366191A | 1991-06-11 | 1991-06-11 | |
US713661 | 1991-06-11 | ||
US713.661 | 1991-06-11 | ||
PCT/US1992/004605 WO1992022891A1 (en) | 1991-06-11 | 1992-06-03 | Variable rate vocoder |
Publications (2)
Publication Number | Publication Date |
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RU93058657A true RU93058657A (ru) | 1998-02-20 |
RU2107951C1 RU2107951C1 (ru) | 1998-03-27 |
Family
ID=24866989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
RU93058657A RU2107951C1 (ru) | 1991-06-11 | 1992-06-03 | Способ сжатия речевого сигнала путем кодирования с переменной скоростью и устройство для его осуществления, кодер и декодер |
Country Status (21)
Country | Link |
---|---|
US (3) | US5414796A (ru) |
EP (8) | EP1675100A2 (ru) |
JP (7) | JP3432822B2 (ru) |
CN (8) | CN1196271C (ru) |
AT (4) | ATE477571T1 (ru) |
AU (3) | AU671952B2 (ru) |
BR (1) | BR9206143A (ru) |
CA (6) | CA2483322C (ru) |
DE (4) | DE69233794D1 (ru) |
DK (2) | DK1126437T3 (ru) |
ES (4) | ES2348319T3 (ru) |
FI (5) | FI120425B (ru) |
HK (3) | HK1014796A1 (ru) |
HU (1) | HU215861B (ru) |
IL (4) | IL113986A (ru) |
MX (1) | MX9202808A (ru) |
NO (1) | NO319559B1 (ru) |
RU (1) | RU2107951C1 (ru) |
SG (1) | SG70558A1 (ru) |
WO (1) | WO1992022891A1 (ru) |
ZA (1) | ZA924082B (ru) |
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- 1992-06-03 CA CA002483296A patent/CA2483296C/en not_active Expired - Lifetime
- 1992-06-03 CA CA002635914A patent/CA2635914A1/en not_active Abandoned
- 1992-06-03 JP JP50090293A patent/JP3432822B2/ja not_active Expired - Lifetime
- 1992-06-03 CA CA002483324A patent/CA2483324C/en not_active Expired - Lifetime
- 1992-06-04 ZA ZA924082A patent/ZA924082B/xx unknown
- 1992-06-09 IL IL11398692A patent/IL113986A/en not_active IP Right Cessation
- 1992-06-09 IL IL11398792A patent/IL113987A/en not_active IP Right Cessation
- 1992-06-09 IL IL10214692A patent/IL102146A/en not_active IP Right Cessation
- 1992-06-09 IL IL11398892A patent/IL113988A/en not_active IP Right Cessation
- 1992-06-11 CN CNB011229659A patent/CN1196271C/zh not_active Expired - Lifetime
- 1992-06-11 CN CNB021055114A patent/CN1220334C/zh not_active Expired - Lifetime
- 1992-06-11 CN CNB011231645A patent/CN1286086C/zh not_active Expired - Lifetime
- 1992-06-11 CN CNA2006101003661A patent/CN1909059A/zh active Pending
- 1992-06-11 CN CN92104618A patent/CN1091535C/zh not_active Expired - Lifetime
- 1992-06-11 MX MX9202808A patent/MX9202808A/es unknown
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1993
- 1993-01-14 US US08/004,484 patent/US5414796A/en not_active Expired - Lifetime
- 1993-12-10 NO NO19934544A patent/NO319559B1/no not_active IP Right Cessation
- 1993-12-13 FI FI935597A patent/FI120425B/fi not_active IP Right Cessation
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1994
- 1994-12-23 US US08/363,170 patent/US5657420A/en not_active Expired - Lifetime
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1996
- 1996-07-31 AU AU60893/96A patent/AU693374B2/en not_active Expired
- 1996-12-06 CN CN96118597A patent/CN1112673C/zh not_active Expired - Lifetime
- 1996-12-06 CN CN96123201A patent/CN1119796C/zh not_active Expired - Lifetime
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1997
- 1997-01-23 US US08/788,728 patent/US5778338A/en not_active Expired - Lifetime
- 1997-02-21 AU AU14825/97A patent/AU711484B2/en not_active Expired
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1998
- 1998-12-28 HK HK98116163A patent/HK1014796A1/xx not_active IP Right Cessation
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2001
- 2001-05-14 JP JP2001144031A patent/JP3566669B2/ja not_active Expired - Lifetime
- 2001-07-10 FI FI20011509A patent/FI20011509A/fi not_active Application Discontinuation
- 2001-07-10 FI FI20011508A patent/FI20011508A/fi not_active Application Discontinuation
- 2001-11-08 JP JP2001343016A patent/JP2002202800A/ja active Pending
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2002
- 2002-04-09 CN CN02105511A patent/CN1398052A/zh active Granted
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2003
- 2003-06-17 JP JP2003172114A patent/JP3751957B2/ja not_active Expired - Lifetime
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2004
- 2004-09-23 HK HK04107333A patent/HK1064785A1/xx not_active IP Right Cessation
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2005
- 2005-01-26 JP JP2005018692A patent/JP3955600B2/ja not_active Expired - Lifetime
- 2005-09-21 JP JP2005273821A patent/JP3964915B2/ja not_active Expired - Lifetime
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2006
- 2006-04-11 JP JP2006108635A patent/JP4191746B2/ja not_active Expired - Lifetime
- 2006-12-15 FI FI20061122A patent/FI20061122L/fi not_active Application Discontinuation
- 2006-12-15 FI FI20061121A patent/FI118702B/fi not_active IP Right Cessation
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2009
- 2009-06-02 HK HK09104958.3A patent/HK1127152A1/xx not_active IP Right Cessation
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