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    • 7. 发明授权
    • Frequency band extending device and method, encoding device and method, decoding device and method, and program
    • 频带扩展装置及方法,编码装置及方法,解码装置及方法及程序
    • US09208795B2
    • 2015-12-08
    • US13499559
    • 2010-09-29
    • Yuki YamamotoToru ChinenHiroyuki HonmaYuhki Mitsufuji
    • Yuki YamamotoToru ChinenHiroyuki HonmaYuhki Mitsufuji
    • H04J1/00G10L21/038G10L19/02
    • G10L21/0388G10L19/0208G10L21/038
    • The present invention relates to a frequency band extending device and method, an encoding device and method, a decoding device and method, and a program, whereby music signals can be played with higher sound quality due to the extension of frequency bands.A bandpass filter 13 divides an input signal into multiple sub-band signals, a feature amount calculating circuit 14 calculates feature amount using at least one of the multiple divided sub-band signals and the input signal, a high frequency sub-band power estimating circuit 15 calculates an estimated value of a high frequency sub-band power based on the calculated feature amount, a high frequency signal generating circuit 16 generates a high frequency signal component based on the multiple sub-band signals divided by the bandpass filter 13, and the estimated value of the high frequency sub-band power calculated by the high frequency sub-band power estimating circuit 15. A frequency band extending device 10 extends the frequency band of the input signal using a high frequency signal component. The present invention may be applied to a frequency band extending device, for example.
    • 本发明涉及一种频带扩展装置及方法,编码装置和方法,解码装置和方法以及程序,由此可以由于频带的扩展而以更高的音质播放音乐信号。 带通滤波器13将输入信号分割为多个子带信号,特征量计算电路14使用多个分频子带信号和输入信号中的至少一个来计算特征量,高频子带功率估计电路 基于计算出的特征量计算高频子带功率的估计值,高频信号生成电路16基于由带通滤波器13分割的多个子带信号生成高频信号分量, 由高频子带功率估计电路15计算的高频子带功率的估计值。频带扩展装置10使用高频信号分量来扩展输入信号的频带。 例如,本发明可以应用于频带扩展装置。
    • 8. 发明申请
    • SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD, ENCODER AND ENCODING METHOD, DECODER AND DECODING METHOD, AND PROGRAM
    • 信号处理装置和信号处理方法,编码器和编码方法,解码器和解码方法及程序
    • US20130202118A1
    • 2013-08-08
    • US13640500
    • 2011-04-11
    • Yuki YamamotoToru ChinenHiroyuki HonmaYuhki Mitsufuji
    • Yuki YamamotoToru ChinenHiroyuki HonmaYuhki Mitsufuji
    • G10L19/008
    • G10L19/008G10L19/0204G10L19/167G10L21/0388
    • The present invention relates to a signal processing apparatus and a signal processing method, an encoder and an encoding method, a decoder and a decoding method, and a program capable of reproducing music signal having a better sound quality by expansion of frequency band.A sampling frequency conversion unit converts a sampling frequency of an input signal, and a sub-band division circuit divides the input signal after the sampling conversion into sub-band signals of sub-bands having the number corresponding to the sampling frequency.A pseudo high band sub-band power calculation circuit calculates pseudo high band sub-band powers based on low band signals of the input signal and coefficient tables having coefficients for the respective high band sub-bands. A pseudo high band sub-band power difference calculation circuit compares high band sub-band powers and the pseudo high band sub-band powers to each other and selects a coefficient table from plural coefficient tables. In addition, a coefficient index which specifies the coefficient table is encoded and set as high band encoded data. The present invention can be applied to an encoder.
    • 本发明涉及一种信号处理装置和信号处理方法,编码器和编码方法,解码器和解码方法,以及能够通过扩展频带来再现具有更好音质的音乐信号的程序。 采样频率转换单元转换输入信号的采样频率,子带分割电路将采样转换后的输入信号分成具有对应于采样频率的数字的子带的子带信号。 伪高带子带功率计算电路基于输入信号的低频带信号和具有各高频子带的系数的系数表来计算伪高频子带功率。 伪高带子带功率差计算电路将高频带子带功率和伪高频带子频带功率进行比较,并从多个系数表中选择系数表。 此外,指定系数表的系数索引被编码并设置为高频带编码数据。 本发明可以应用于编码器。