-
公开(公告)号：US09886964B2
公开(公告)日：2018-02-06
申请号：US15646645
申请日：2017-07-11
IPC分类号： G10L21/0388 , G10L19/26 , G10L19/02
CPC分类号： G10L19/265 , G10L19/0204 , G10L21/0388
摘要： A coding apparatus encodes a first band of an input audio signal, normalizes a first spectrum included in each sub-band of the first band using a spectrum power envelope, performs a clipping process on the normalized first spectrum, the clipping process comparing between a predetermined threshold and the absolute value of an amplitude of the spectrum and replaces the amplitude value of the spectrum with the threshold if the absolute value of the amplitude of the spectrum exceeds the threshold, calculates a correlation between a spectrum in each divided band of a second band and a spectrum in a plurality of candidate bands containing the clipped normalized first spectrum, the second spectrum being higher than a predetermined frequency, identifies the best bands of the plurality of candidate bands, and encodes the second spectrum using lag information identifying the best band for transmitting the lag information to a decoder.
-
公开(公告)号：US10269367B2
公开(公告)日：2019-04-23
申请号：US15843842
申请日：2017-12-15
IPC分类号： G10L19/26 , G10L19/02 , G10L21/0388
摘要： A coding apparatus, including a processor that performs operations, including encoding a first band of an input audio signal to be a first spectrum and dividing the first spectrum into a plurality of subbands at equal intervals, each interval including a predetermined number of samples. The operations also include searching a largest amplitude value of the divided first spectrum in each of the subbands, and normalizing the divided first spectrum with the largest amplitude values searched in each of the subbands to obtain a flattened first spectrum. The operations further include searching a best band which has a largest correlation value between each divided band of a second band spectrum and the flattened first spectrum, the second spectrum being higher than a predetermined frequency, and encoding the second spectrum using lag information identifying the best bands for transmitting the lag information to a decoder side.
-
公开(公告)号：US09741356B2
公开(公告)日：2017-08-22
申请号：US15168805
申请日：2016-05-31
IPC分类号： G10L21/0388 , G10L19/26 , G10L19/02
CPC分类号： G10L19/265 , G10L19/0204 , G10L21/0388
摘要： A coding apparatus normalizes a low-frequency spectrum included in each of sub-bands obtained from dividing a low band part, using a largest amplitude value among the low-frequency spectrum included in each sub-band, obtains a normalized low-frequency spectrum by decoding the first encoded data, and calculates a correlation between each divided band of a high-frequency spectrum and a plurality of candidate bands of the normalized low-frequency spectrum. The best bands of a plurality of candidate bands are identified, each candidate band having a starting frequency position with non-zero amplitude in the normalized low-frequency spectrum, the high-frequency spectrum being in a high band part of the input audio signal that is higher than the predetermined frequency, and the high-frequency spectrum is encoded using lag information identifying the best band for transmitting the lag information to a decoder.
-
公开(公告)号：US09390721B2
公开(公告)日：2016-07-12
申请号：US14370080
申请日：2012-12-20
IPC分类号： G10L21/00 , G10L15/00 , G06F17/20 , G10L15/04 , G10L13/06 , G10L15/20 , G10L15/10 , G10L15/197 , G10L19/26 , G10L21/038 , G10L19/002 , G10L19/24
CPC分类号： G10L19/26 , G10L19/002 , G10L19/24 , G10L21/038
摘要： The present invention pertains to a speech decoding device that is capable of preventing degradation in sound quality associated with an adjustment of the slope of a spectrum of an output signal (a decoding signal), making it less likely that a loss of bandwidth sensitivity due to the attenuation of a higher band region is perceived. For each frame of the bandwidth extension layer decoding signal, a filter assessment unit (304) determines whether or not to apply a low-pass filter to the bandwidth extension layer decoding signal on the basis of a change in energy in the bandwidth extension layer decoding signal. A low-pass filtering unit (306) filters the bandwidth extension layer decoding signal of the frames to which the low-pass filter is to be applied, as determined by the filter assessment unit (304), using the low-pass filter.
摘要翻译： 本发明涉及能够防止与输出信号（解码信号）的频谱的斜率的调整相关联的声音质量下降的语音解码装置，使得不太可能由于 感觉到较高带区的衰减。 对于带宽扩展层解码信号的每个帧，滤波器评估单元（304）基于带宽扩展层解码中的能量变化来确定是否对带宽扩展层解码信号应用低通滤波器 信号。 低通滤波单元（306）使用低通滤波器对由滤波器评估单元（304）确定的要应用低通滤波器的帧的带宽扩展层解码信号进行滤波。
-
公开(公告)号：US20140343932A1
公开(公告)日：2014-11-20
申请号：US14370080
申请日：2012-12-20
IPC分类号： G10L19/26 , G10L19/002
CPC分类号： G10L19/26 , G10L19/002 , G10L19/24 , G10L21/038
摘要： The present invention pertains to a speech decoding device that is capable of preventing degradation in sound quality associated with an adjustment of the slope of a spectrum of an output signal (a decoding signal), making it less likely that a loss of bandwidth sensitivity due to the attenuation of a higher band region is perceived. For each frame of the bandwidth extension layer decoding signal, a filter assessment unit (304) determines whether or not to apply a low-pass filter to the bandwidth extension layer decoding signal on the basis of a change in energy in the bandwidth extension layer decoding signal. A low-pass filtering unit (306) filters the bandwidth extension layer decoding signal of the frames to which the low-pass filter is to be applied, as determined by the filter assessment unit (304), using the low-pass filter.
摘要翻译： 本发明涉及一种语音解码装置，其能够防止与调整输出信号的频谱（解码信号）的斜率相关联的声音质量下降，使得不太可能由于 感觉到较高带区的衰减。 对于带宽扩展层解码信号的每个帧，滤波器评估单元（304）基于带宽扩展层解码中的能量变化来确定是否对带宽扩展层解码信号应用低通滤波器 信号。 低通滤波单元（306）使用低通滤波器对由滤波器评估单元（304）确定的要应用低通滤波器的帧的带宽扩展层解码信号进行滤波。
-
-
-
-
搜索结果
5 条记录 (耗时 0.027 秒)
