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    • 32. 发明申请
    • AUDIO SIGNAL DECODING DEVICE AND METHOD OF BALANCE ADJUSTMENT
    • 音频信号解码装置和平衡调整方法
    • US20110268280A1
    • 2011-11-03
    • US13144041
    • 2010-01-12
    • Takuya Kawashima
    • Takuya Kawashima
    • H04R5/00
    • G10L19/005G10L19/008
    • Disclosed is an audio signal decoding device and a method of balance adjustment that reduces a fluctuation of a decoded signal orientation and maintains a stereo perception. An interchannel correlation computation unit (224) computes a correlation between a left channel decoded stereo signal and a right channel decoded stereo signal, and if the interchannel correlation is low, a peak detection unit (225) uses a peak component of a decoded monaural signal of the current frame and a peak component of either a left or a right channel of the preceding frame to detect a peak component with a high temporal correlation. The peak detection unit (225) combines and outputs, from among the frequencies of the detected peak components, a peak frequency of a frame n−1 and a peak frequency of a frame n. A peak balance coefficient computation unit (226) computes, from the peak frequency of the frame n−1, a balance parameter that is used in converting a peak frequency component of the monaural signal to stereo.
    • 公开了一种音频信号解码装置和平衡调整方法,其减少解码信号取向的波动并保持立体感。 通道间相关计算单元(224)计算左声道解码立体声信号和右声道解码立体声信号之间的相关性,并且如果通道间相关性低,则峰值检测单元(225)使用解码的单声道信号的峰值分量 以及前一帧的左声道或右声道的峰值分量,以检测具有高时间相关性的峰分量。 峰值检测单元225从检测到的峰值分量的频率中组合并输出帧n-1的峰值频率和帧n的峰值频率。 峰值平衡系数计算单元(226)从帧n-1的峰值频率计算用于将单声道信号的峰值频率分量转换成立体声的平衡参数。
    • 33. 发明申请
    • SCALABLE ENCODING DEVICE AND SCALABLE ENCODING METHOD
    • 可扩展编码设备和可扩展编码方法
    • US20090070107A1
    • 2009-03-12
    • US12293302
    • 2007-03-15
    • Takuya KawashimaHiroyuki EharaKoji Yoshida
    • Takuya KawashimaHiroyuki EharaKoji Yoshida
    • G10L19/02H04L27/00
    • G10L19/005G10L19/002G10L19/24
    • Provided is a scalable encoding device capable of improving quality of a decoded signal without increasing an encoding amount and compensating data with a sufficient quality upon data loss. In the scalable encoding device, an extension layer bit distribution calculation unit (103) calculates a bit distribution of a quality improving encoding data and compensation encoding data in the extension layer according to an audio mode of the input signal. An extension layer encoding unit (105) generates quality improving encoding data according to the specified number of bits. A compensation information encoding unit (104) extracts a part of core layer encoding data and makes it as compensation encoding data for the core layer. An extension layer encoded data generation unit (106) multiplexes the extension layer bit distribution information, the compensation encoding data, and the quality improving encoding data so as to obtain extension layer encoding data.
    • 提供了一种可扩展编码装置,能够在不增加编码量的情况下提高解码信号的质量,并且在数据丢失时能够以足够的质量补偿数据。 在可扩展编码装置中,扩展层位分配计算单元(103)根据输入信号的音频模式来计算扩展层中的质量改进编码数据和补偿编码数据的位分配。 扩展层编码单元(105)根据指定的比特数产生质量改进编码数据。 补偿信息编码单元(104)提取核心层编码数据的一部分,并将其作为核心层的补偿编码数据。 扩展层编码数据生成单元(106)多路复用扩展层位分配信息,补偿编码数据和质量改进编码数据,以获得扩展层编码数据。
    • 35. 发明授权
    • Audio encoding device using concealment processing and audio decoding device using concealment processing
    • 使用隐藏处理的音频编码装置和使用隐藏处理的音频解码装置
    • US09129590B2
    • 2015-09-08
    • US12528671
    • 2008-02-29
    • Takuya KawashimaHiroyuki EharaKoji Yoshida
    • Takuya KawashimaHiroyuki EharaKoji Yoshida
    • G10L19/00G10L19/005G10L19/12
    • G10L19/005G10L19/12
    • Disclosed are an audio encoding device and an audio decoding device which reduce degradation of subjective quality of a decoding signal caused by power mismatch of a decoding signal which is generated by a concealing process upon disappearance of a frame. When a frame is lost, a past encoding parameter is used to obtain a concealed LPC of the current frame and a concealed sound source parameter. A normal CELP decoding is performed from the obtained concealed sound source parameter. Correction is performed by using a conceal parameter on the obtained concealed LPC and the concealed sound source signal. The power of the corrected concealed sound source signal is adjusted to match a reference sound source power. A filter gain of the synthesis filter is adjusted so as to adjust the power of a decoded sound signal to the power of a decoded sound signal during an error-free state. Moreover, a synthesis filter gain adjusting coefficient is calculated by using an estimated normalized residual power so that a filter gain of a synthesis filter formed by using a concealed LPC is a filter gain during an error-free state.
    • 公开了一种音频编码装置和音频解码装置,其减少由于帧消失时由隐藏处理产生的解码信号的功率失配引起的解码信号的主观质量的劣化。 当帧丢失时,使用过去的编码参数来获得当前帧的隐藏的LPC和隐藏的声源参数。 从获得的隐藏声源参数执行正常的CELP解码。 通过对所获得的隐蔽LPC和隐藏的声源信号使用隐藏参数来执行校正。 校正的隐蔽声源信号的功率被调整以匹配参考声源功率。 调整合成滤波器的滤波器增益,以便在无错误状态期间将解码声音信号的功率调整为解码声音信号的功率。 此外,通过使用估计的归一化剩余功率来计算合成滤波器增益调整系数,使得通过使用隐藏的LPC形成的合成滤波器的滤波器增益在无错误状态期间是滤波器增益。
    • 36. 发明授权
    • Speech decoding and encoding apparatus for lost frame concealment using predetermined number of waveform samples peripheral to the lost frame
    • 语音解码和编码装置,用于使用丢失帧外围的预定数量的波形样本丢帧隐藏
    • US08812306B2
    • 2014-08-19
    • US12307974
    • 2007-07-11
    • Takuya KawashimaHiroyuki EharaKoji Yoshida
    • Takuya KawashimaHiroyuki EharaKoji Yoshida
    • G10L21/00H04L1/00G10L19/005G10L25/90H04L12/56
    • G10L19/005G10L25/90G10L2019/0011H04L47/10
    • An audio decoding device capable of suppressing an information amount for a lost flame compensation process and encoding efficiency is provided. A decoded sound source generator generates a lost frame's CELP decoded sound source signal. A pitch pulse information decoder CELP decodes a pitch pulse position information and a pitch pulse amplitude information. A pitch pulse waveform learner learns a pitch pulse learning waveform in a past frame in advance from the lost frame. A convolution adjuster amplitude-adjusts the pitch pulse learning waveform according to the pitch pulse amplitude information by considering a predetermined number of waveforms peripheral to a peak position of the lost frame's CELP decoded excitation signal, and convolutes a pitch pulse waveform into a time axis which has been amplitude-adjusted according to the pitch pulse position information. A sound source signal corrector adds or replaces the pitch pulse waveform convoluted into the time axis to the lost flame decoded sound source signal.
    • 提供能够抑制失火补偿处理和编码效率的信息量的音频解码装置。 解码声源发生器产生丢失帧的CELP解码声源信号。 音调脉冲信息解码器CELP解码音调脉冲位置信息和音调脉冲幅度信息。 音调脉冲波形学习者从丢失的帧中预先学习过去帧中的音调脉冲学习波形。 卷积调整器通过考虑丢失帧的CELP解码的激励信号的峰值位置外围的预定数量的波形,根据音调脉冲幅度信息来振幅调整音调脉冲学习波形,并将音调脉冲波形卷曲成时间轴, 已经根据音调脉冲位置信息进行了幅度调整。 声源信号校正器将与时间轴卷积的音调脉冲波形相加或替换为失火解码声源信号。
    • 37. 发明申请
    • ENCODING DEVICE, DECODING DEVICE, ENCODING METHOD AND DECODING METHOD
    • 编码设备,解码设备,编码方法和解码方法
    • US20140200901A1
    • 2014-07-17
    • US14238041
    • 2012-08-24
    • Takuya KawashimaKatsunori DaimouMasahiro Oshikiri
    • Takuya KawashimaKatsunori DaimouMasahiro Oshikiri
    • G10L19/26
    • G10L19/265G10L19/0204G10L21/0388
    • By copying to a high-frequency band portion (extension band) a low-frequency band portion in which peaking has been set to a sufficiently low state, this encoding device is capable of preventing generation of a spectrum with overly high peaking in the high-frequency band portion, and of generating a high-quality extension band spectrum. This device comprises: a maximum value search unit which searches, in each of multiple sub-bands obtained by dividing the low-frequency band portion of an audio signal and/or music signal below a prescribed frequency, for the maximum value of the amplitude of a first spectrum obtained by decoding first encoded data, which is encoded data in the low-frequency band portion; and an amplitude normalization unit which obtains a normalized spectrum by normalizing, at the maximum values of the amplitude of each sub-band, the first spectrum contained in each sub-band.
    • 通过将峰值设定为足够低的低频区域的低频带部分(扩展频带)复制到该高频带部分(扩展频带),该编码装置能够防止高频带部分 频带部分,并且产生高质量的扩展频带。 该装置包括:最大值搜索单元,其在通过将音频信号的低频带部分和/或音频信号低于规定频率的下划线获得的多个子带中搜索最大值的幅度的最大值 通过对作为低频带部分中的编码数据的第一编码数据进行解码而获得的第一频谱; 以及振幅归一化单元,其通过在每个子带的振幅的最大值处归一化包含在每个子带中的第一频谱来获得归一化频谱。
    • 39. 发明申请
    • DECODER, ENCODER, AND METHODS THEREOF
    • 解码器,编码器及其方法
    • US20130085752A1
    • 2013-04-04
    • US13702382
    • 2011-05-27
    • Takuya KawashimaMasahiro Oshikiri
    • Takuya KawashimaMasahiro Oshikiri
    • G10L21/034
    • G10L21/034G10L19/0204G10L19/0212G10L19/12G10L19/22G10L19/24
    • Disclosed is a decoder capable of improving the sound quality of a decoded sound signal in an encoding method which combines speech encoding and music encoding in a hierarchical structure. A transform-encoding decoding unit (202) decodes transform-encoded data to generate a spectrum of a decoded transform-encoded signal. A band decision unit (203) uses the spectrum of the decoded transform-encoded signal to decide whether each of a plurality of bands in which frequency components of an input signal are divided constitute a first band in which a transform encoded pulse is not established or a second band in which said pulse is established. A CELP component suppression unit (207) suppresses the spectrum of a CELP decoded signal, which is the frequency component of a decoded signal of CELP encoded data, to the extent that suppression in the first band is weaker than suppression in the second band.
    • 公开了一种解码器,其能够以分层结构组合语音编码和音乐编码的编码方法来提高解码声音信号的声音质量。 变换编码解码单元(202)对变换编码数据进行解码,生成解码变换编码信号的频谱。 频带判定单元(203)使用解码后的变换编码信号的频谱来判定输入信号的频率成分被划分的多个频带中的每一个是否构成未建立变换编码脉冲的第一频带, 其中建立所述脉冲的第二频带。 CELP分量抑制单元(207)抑制作为CELP编码数据的解码信号的频率分量的CELP解码信号的频谱,使得第一频带的抑制弱于第二频带中的抑制。
    • 40. 发明授权
    • Scalable encoding device and scalable encoding method including quality improvement of a decoded signal
    • 可扩展编码装置和可扩展编码方法,包括解码信号的质量改进
    • US08370138B2
    • 2013-02-05
    • US12293302
    • 2007-03-15
    • Takuya KawashimaHiroyuki EharaKoji Yoshida
    • Takuya KawashimaHiroyuki EharaKoji Yoshida
    • G10L19/02
    • G10L19/005G10L19/002G10L19/24
    • A scalable encoding device is capable of improving quality of a decoded signal without increasing an encoding amount and compensating data with a sufficient quality upon data loss. An extension layer bit distribution calculator calculates a bit distribution of a quality improving encoding data and compensation encoding data in the extension layer according to an audio mode of the input signal. An extension layer encoder generates quality improving encoding data according to the specified number of bits. A compensation information encoder extracts a part of core layer encoding data and makes it as compensation encoding data for the core layer. An extension layer encoded data generator multiplexes the extension layer bit distribution information, the compensation encoding data, and the quality improving encoding data so as to obtain extension layer encoding data.
    • 可扩展编码装置能够在不增加编码量的情况下提高解码信号的质量,并且在数据丢失时能够以足够的质量补偿数据。 扩展层位分配计算器根据输入信号的音频模式来计算扩展层中的质量改进编码数据和补偿编码数据的位分布。 扩展层编码器根据指定的位数生成质量改进编码数据。 补偿信息编码器提取核心层编码数据的一部分,并将其作为核心层的补偿编码数据。 扩展层编码数据生成器多路复用扩展层位分配信息,补偿编码数据和质量改进编码数据,以便获得扩展层编码数据。