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1. 发明专利

AU2020201647B2 Pitch Filter for Audio Signals and Method for Filtering an Audio Signal with a Pitch Filter 未知
公开(公告)号：AU2020201647B2
公开(公告)日：2021-04-01
申请号：AU2020201647
申请日：2020-03-05
申请人： DOLBY INT AB
发明人： RESCH BARBARA , KJORLING KRISTOFER , VILLEMOES LARS
IPC分类号： G10L19/02 , G10L19/107 , G10L19/20 , G10L19/26
摘要： In some embodiments, a pitch filter for filtering a preliminary audio signal generated from an audio bitstream is disclosed. The pitch filter has an 5 operating mode selected from one of either: (i) an active mode where the preliminary audio signal is filtered using filtering information to obtain a filtered audio signal, and (ii) an inactive mode where the pitch filter is disabled. The preliminary audio signal is generated in an audio decoder having a coding mode selected from one of at least two distinct coding modes, and the pitch 10 filter is capable of being selectively operated in either the active mode or the inactive mode based on control information while the audio decoder is operating in the coding mode. A method for filtering a preliminary audio signal with a pitch filter substantially as described above is also disclosed. WO 2012/000882 PCT/EP2Ot1/060555 ci) co) C-) + IS U) U)l CFig 3

2. 发明专利

CA3040083C METHOD FOR REDUCTION OF ALIASING INTRODUCED BY SPECTRAL ENVELOPE ADJUSTMENT IN REAL-VALUED FILTERBANKS 未知
公开(公告)号：CA3040083C
公开(公告)日：2020-01-14
申请号：CA3040083
申请日：2003-08-27
申请人： DOLBY INT AB
发明人： KJORLING KRISTOFER , VILLEMOES LARS
IPC分类号： G10L19/02 , G10L25/18 , G10L25/21 , G10L25/48 , H03H17/02
摘要： A method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.

3. 发明专利

AU2018200340A1 Advanced stereo coding based on a combination of adaptively selectable left/right or mid/side stereo coding and of parametric stereo coding 未知
公开(公告)号：AU2018200340A1
公开(公告)日：2018-02-08
申请号：AU2018200340
申请日：2018-01-15
申请人： DOLBY INT AB
发明人： PURNHAGEN HEIKO , CARLSSON PONTUS , KJORLING KRISTOFER
IPC分类号： G10L19/00
摘要： The application relates to audio encoder and decoder systems. An embodiment of the encoder system comprises a downmix stage for generating a downmix signal and a residual signal based on a stereo signal. In addition, the encoder system comprises a parameter determining stage for determining parametric stereo parameters such as an inter-channel intensity difference and an inter-channel cross-correlation. Preferably, the parametric stereo parameters are time- and frequency-variant. Moreover, the encoder system comprises a transform stage. The transform stage generates a pseudo left/right stereo signal by performing a transform based on the downmix signal and the residual signal. The pseudo stereo signal is processed by a perceptual stereo encoder. For stereo encoding, left/right encoding or mid/side encoding is selectable. Preferably, the selection between left/right stereo encoding and mid/side stereo encoding is time- and frequency-variant

4. 发明专利

RU2616774C1 АУДИОДЕКОДЕР ДЛЯ ДЕКОДИРОВАНИЯ БИТОВОГО АУДИОПОТОКА, АУДИОКОДЕР ДЛЯ КОДИРОВАНИЯ ЗВУКОВОГО СИГНАЛА И СПОСОБ ДЕКОДИРОВАНИЯ КАДРА КОДИРОВАННОГО ЗВУКОВОГО СИГНАЛА 未知
公开(公告)号：RU2616774C1
公开(公告)日：2017-04-18
申请号：RU2016127810
申请日：2016-07-11
申请人： DOLBY INT AB
发明人： RESCH BARBARA , KJORLING KRISTOFER , VILLEMOES LARS
IPC分类号： G10L19/107 , G10L19/02 , G10L19/20 , G10L19/26
摘要： Изобретениеотноситсяк кодированиюцифровогозвука, вчастностик кодированиюзвуковыхсигналов, содержащихсоставляющиеразногохарактера. Способдекодированиякадракодированногозвуковогосигнала, приэтомкодированныйзвуковойсигналгенерируютаудиокодером, приэтомспособвключает: извлечениепервогопараметраизкодированногозвуковогосигнала, приэтомпервыйпараметрпредставляетрежимкодированиядлякадра; извлечениевторогопараметраизкодированногозвуковогосигнала; запусклибопервогорежимадекодирования, либовторогорежимадекодированиянаосновезначенияпервогопараметра; генерированиепредварительногозвуковогосигналаизкодированногозвуковогосигналаприработелибов первомрежимедекодирования, либововторомрежимедекодирования; ифильтрациюпредварительногозвуковогосигналас помощьюфильтравысотытона. Приэтомприфильтрациииспользуютвторойпараметрдлявыборочногоподключенияилиотключенияфильтравысотытона, ивторойпараметротличныйотпервогопараметра. Техническийрезультатзаключаетсяв ослаблениимежгармоническогошума. 3 н. и 17 з.п. ф-лы, 11 ил.

5. 发明专利

AU2016204303A1 PITCH FILTER FOR AUDIO SIGNALS AND METHOD FOR FILTERING AN AUDIO SIGNAL WITH A PITCH FILTER 未知
公开(公告)号：AU2016204303A1
公开(公告)日：2016-07-14
申请号：AU2016204303
申请日：2016-06-23
申请人： DOLBY INT AB
发明人： RESCH BARBARA , KJORLING KRISTOFER , VILLEMOES LARS
IPC分类号： G10L19/02 , G10L19/107 , G10L19/20 , G10L19/26
摘要： In some embodiments, a pitch filter for filtering a preliminary audio signal generated from an audio bitstream is disclosed. The pitch filter has an 5 operating mode selected from one of either: (i) an active mode where the preliminary audio signal is filtered using filtering information to obtain a filtered audio signal, and (ii) an inactive mode where the pitch filter is disabled. The preliminary audio signal is generated in an audio decoder having a coding mode selected from one of at least two distinct coding modes, and the pitch 10 filter is capable of being selectively operated in either the active mode or the inactive mode based on control information while the audio decoder is operating in the coding mode. A method for filtering a preliminary audio signal with a pitch filter substantially as described above is also disclosed. WO 2012/000882 PCT/EP2O1 1/060555 co~ coC ci, n ClCo SoCo C)) Fig.

6. 发明专利

AU2010225051B2 Advanced stereo coding based on a combination of adaptively selectable left/right or mid/side stereo coding and of parametric stereo coding 未知
公开(公告)号：AU2010225051B2
公开(公告)日：2013-06-13
申请号：AU2010225051
申请日：2010-03-05
申请人： DOLBY INT AB
发明人： PURNHAGEN HEIKO , CARLSSON PONTUS , KJORLING KRISTOFER
IPC分类号： G10L19/00
摘要： The application relates to audio encoder and decoder systems. An embodiment of the encoder system comprises a downmix stage for generating a downmix signal and a residual signal based on a stereo signal. In addition, the encoder system comprises a parameter determining stage for determining parametric stereo parameters such as an inter-channel intensity difference and an inter-channel cross-correlation. Preferably, the parametric stereo parameters are time- and frequency-variant. Moreover, the encoder system comprises a transform stage. The transform stage generates a pseudo left/right stereo signal by performing a transform based on the downmix signal and the residual signal. The pseudo stereo signal is processed by a perceptual stereo encoder. For stereo encoding, left/right encoding or mid/side encoding is selectable. Preferably, the selection between left/right stereo encoding and mid/side stereo encoding is time- and frequency-variant.

7. 发明专利

AU2011273680A1 Selective bass post filter 未知
公开(公告)号：AU2011273680A1
公开(公告)日：2012-12-20
申请号：AU2011273680
申请日：2011-06-23
申请人： DOLBY INT AB
发明人： RESCH BARBARA , KJORLING KRISTOFER , VILLEMOES LARS
IPC分类号： G10L19/02 , G10L19/107 , G10L19/20 , G10L19/26
摘要： In one aspect, the invention provides an audio encoding method characterized by a decision being made as to whether the device which will decode the resulting bit stream should apply post filtering including attenuation of interharmonic noise. Hence, the decision whether to use the post filter, which is encoded in the bit stream, is taken separately from the decision as to the most suitable coding mode. In another aspect, there is provided an audio decoding method with a decoding step followed by a post-filtering step, including interharmonic noise attenuation, and being characterized in a step of disabling the post filter in accordance with post filtering information encoded in the bit stream signal. Such a method is well suited for mixed-origin audio signals by virtue of its capability to deactivate the post filter in dependence of the post filtering information only, hence independently of factors such as the current coding mode.

8. 发明专利

CA2937672A1 SELECTIVE BASS POST FILTER 未知
公开(公告)号：CA2937672A1
公开(公告)日：2012-01-05
申请号：CA2937672
申请日：2011-06-23
申请人： DOLBY INT AB
发明人： RESCH BARBARA , KJORLING KRISTOFER , VILLEMOES LARS
IPC分类号： G10L21/003 , G10L19/02 , G10L19/107 , G10L19/125 , G10L19/20 , G10L19/26
摘要： In one aspect, the invention provides an audio encoding method characterized by a decision being made as to whether the device which will decode the resulting bit stream should apply post filtering including attenuation of interharmonic noise. Hence, the decision whether to use the post filter, which is encoded in the bit stream, is taken separately from the decision as to the most suitable coding mode.In another aspect, there is provided an audio decoding method with a decoding step followed by a post-filtering step, including interharmonic noise attenuation, and being characterized in a step of disabling the post filter in accordance with post filtering information encoded in the bit stream signal. Such a method is well suited for mixed-origin audio signals by virtue of its capability to deactivate the post filter in dependence of the post filtering information only, hence independently of factors such as the current coding mode.

9. 发明专利

ES2350746T3 APARATO PARA CALCULAR VALORES DE AJUSTE DE GANANCIA PARA AJUSTAR LA GANANCIA DE UNA PLURALIDAD DE SENALES DE SUBBANDA EN BANCOS DE FILTROS DE VALOR REAL Y METODO CORRESPONDIENTE. 未知
公开(公告)号：ES2350746T3
公开(公告)日：2011-01-26
申请号：ES06000181
申请日：2003-08-27
申请人： DOLBY INT AB
发明人： VILLEMOES LARS , KJORLING KRISTOFER
IPC分类号： H03H17/02 , G10L19/02 , G10L25/18 , G10L25/48
摘要： Aparato para calcular valores de ajuste de ganancia para ajustar la ganancia de una pluralidad de señales de subbanda generadas filtrando una señal utilizando un banco de filtros de análisis, teniendo el banco de filtros, filtros de subbanda, teniendo filtros de subbanda adyacentes del banco de filtros bandas de transición que se superponen en un intervalo de superposición, que comprende: medios (82) para examinar una señal de subbanda que se origina desde un filtro de subbanda y una señal de subbanda adyacente que se origina desde un filtro de subbanda adyacente, para determinar si la señal de subbanda y la señal de subbanda adyacente tienen componentes de señal que generan solapamiento en el intervalo de superposición para obtener señales de subbanda agrupadas en respuesta a un resultado positivo del examen; medios (84) para calcular un primer valor de ajuste de ganancia y un segundo valor de ajuste de ganancia para las señales de subbanda adyacentes agrupadas, de modo que las señales de subbanda adyacentes agrupadas no tengan valores de ganancia independientes, en el que los medios de cálculo son operativos para determinar una indicación de una energía de referencia para las señales de subbanda agrupadas y una estimación de energía para una energía en las señales de subbanda adyacentes agrupadas, y para calcular los valores de ajuste de ganancia para las señales de subbanda agrupadas basándose en la indicación de la energía de referencia y la estimación de energía, en el que los medios (84) de cálculo están conectados a medios para la emisión, para su transmisión a un decodificador, del primer valor de ajuste de ganancia y el segundo valor de ajuste de ganancia o están conectados a medios para ajustar la ganancia de las señales de subbanda adyacentes utilizando el primer valor de ajuste de ganancia y el segundo valor de ajuste de ganancia.

10. 发明专利

AU2006235813B2 Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks 未知
公开(公告)号：AU2006235813B2
公开(公告)日：2009-03-12
申请号：AU2006235813
申请日：2006-10-31
申请人： DOLBY INT AB
发明人： KJORLING KRISTOFER , VILLEMOES LARS
IPC分类号： H03H17/02 , G10L19/02

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