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    • 11. 发明授权
    • Signal processing device and signal processing method
    • 信号处理装置及信号处理方法
    • US07340497B2
    • 2008-03-04
    • US11023333
    • 2004-12-27
    • Atsushi KikuchiHiroyuki HonmaKyoya Tsutsui
    • Atsushi KikuchiHiroyuki HonmaKyoya Tsutsui
    • G06F17/14
    • G06F17/147
    • A signal processing device and method for performing a code string transform by transforming a time series signal with a frequency band from 0 to 20 kHz from a coding system into another, wherein the arithmetic operations of MDCT and IMDCT with a limited frequency band from 0 to 15 kHz are carried out at high speed by performing computations using an FFT operation with a short tap length in the IMDCT processing operation. This allows a reduced work area and a higher speed for arithmetic operations by reducing the number of multiplications and additions when performing MDCT operations, IMDCT operation and/or transforming code strings between different coding system.
    • 一种信号处理装置和方法,用于通过将具有0至20kHz的频带的时间序列信号从编码系统转换为另一个来执行编码串变换,其中,具有从0到...的有限频带的MDCT和IMDCT的算术运算 通过在IMDCT处理操作中使用具有短抽头长度的FFT操作进行计算,高速执行15kHz。 这允许通过在执行MDCT操作,IMDCT操作和/或在不同编码系统之间转换代码串时减少乘法和加法的次数来减少工作区域和更高的算术运算速度。
    • 20. 发明申请
    • ENCODING DEVICE, ENCODING METHOD, AND PROGRAM
    • 编码设备,编码方法和程序
    • US20140172433A2
    • 2014-06-19
    • US14006148
    • 2012-03-23
    • Hiroyuki HonmaToru ChinenYuki YamamotoMitsuyuki Hatanaka
    • Hiroyuki HonmaToru ChinenYuki YamamotoMitsuyuki Hatanaka
    • G10L19/008
    • G10L19/008G10L19/002G10L19/0204G10L19/24
    • This technology relates to an encoding device, an encoding method, and a program capable of improving audio quality and more efficiently encoding audio. A first high-frequency encoding circuit encodes a high-frequency range based on a low-frequency subband signal and a high-frequency subband signal and obtains a high-frequency code amount. A low-frequency encoding circuit encodes a low-frequency signal with a code amount determined by the high-frequency code amount and a low-frequency decoding circuit decodes the encoded low-frequency signal. A subband dividing circuit divides a decoded low-frequency signal obtained by decoding into decoded low-frequency subband signals of a plurality of subbands and a second high-frequency encoding circuit generates a high-frequency code string such that a code amount of the high-frequency code string for obtaining a high-frequency component is not larger than the high-frequency code amount based on the decoded low-frequency subband signals and the high-frequency subband signals. The present invention is applicable to the encoding device.
    • 该技术涉及能够改善音频质量并且更有效地编码音频的编码装置,编码方法和程序。 第一高频编码电路基于低频子带信号和高频子带信号对高频范围进行编码,并获得高频码量。 低频编码电路以由高频码量确定的码量对低频信号进行编码,低频解码电路解码编码的低频信号。 子带分割电路将通过解码获得的解码低频信号划分为多个子带的解码低频子带信号,第二高频编码电路生成高频编码串, 基于解码的低频子带信号和高频子带信号,用于获得高频分量的频率码串不大于高频编码量。 本发明可应用于编码装置。