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    • 9. 发明申请
    • METHOD AND DEVICE FOR CODING AN AUDIO SIGNAL BY
    • 通过“前进”和“后向”LPC分析对音频信号进行编码的方法和装置
    • WO98047134A1
    • 1998-10-22
    • PCT/FR1998/000723
    • 1998-04-09
    • G10L19/06G10L19/18H04B14/04G10L7/02
    • G10L19/18G10L19/06
    • The invention concerns a method and a device for coding an audio signal by "forward" and "backward" LPC analysis, the coding being produced by "forward" LPC filtering for non-stationary zones and on a synthetic signal based on "backward" LPC filtering for stationary zones. For each current LPC block (Bn) (10), the degree of stationarity of the digital audio signal is determined (11), and a "forward" or "backward" LPC analysis selection value is established (12) based on a decision function, according to the stationarity parameter. A "forward" or "backward" LPC analysis criterion is applied (13) to the analysis selection value to produce the audio signal coding before proceeding to the next LPC block. The invention is applicable to mobile radiotelephony, to the production, memorisation of audio recordings, to the transmission by satellite and wideband telephony.
    • 本发明涉及一种通过“前进”和“后向”LPC分析对音频信号进行编码的方法和装置,该编码是通过非正常区域的“前向”LPC滤波和基于“反向”LPC的合成信号产生的 过滤固定区域。 对于每个当前LPC块(Bn)(10),确定数字音频信号的平稳度(11),并且基于决定函数建立“前向”或“后向”LPC分析选择值(12) ,根据平稳参数。 在分析选择值中应用“前进”或“后向”LPC分析标准(13)以在进行下一个LPC块之前产生音频信号编码。 本发明适用于通过卫星和宽带电话传输的移动无线电话,音频记录的制作,记忆。
    • 10. 发明申请
    • WAVEFORM-BASED PERIODICITY DETECTOR
    • 基于波形的周期性检测器
    • WO99010879A1
    • 1999-03-04
    • PCT/SE1998/001444
    • 1998-08-07
    • G10L11/02G10L11/04G10L7/02
    • G10L25/90G10L2025/786
    • A waveform-based technique for generating periodicity information from an input signal includes generating a pre-processed signal by applying low pass and non-linear filtering to the input signal, wherein the pre-processed signal has highlighted speech pitch tracks. An adaptive threshold algorithm is applied to the pre-processed signal to generate a detection signal having waveform segments whose peaks are separated by a pitch period of the input signal. A period between peaks in the detection signal is determined that indicates the periodicity information. Information about the period between the peaks in the detection signal is then used to adapt a scaling value to be used by the adaptive threshold algorithm in a subsequent step. The periodicity information may be utilized in a voice activity detector in a telephonic communications system.
    • 用于从输入信号产生周期性信息的基于波形的技术包括通过对输入信号应用低通和非线性滤波来产生预处理信号,其中预处理信号具有突出的语音音调轨道。 对预处理的信号应用自适应阈值算法以产生具有其峰值被输入信号的音调周期分隔的波形段的检测信号。 确定检测信号中的峰值之间的周期,其指示周期性信息。 然后使用关于检测信号中的峰值之间的周期的信息来适应随后步骤中由自适应阈值算法使用的缩放值。 周期性信息可以在电话通信系统中的语音活动检测器中使用。