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    • 8. 发明申请
    • IMPROVING TRANSIENT PERFORMANCE OF LOW BIT RATE AUDIO CODING SYSTEMS BY REDUCING PRE-NOISE
    • 通过减少预噪声来改善低比特率音频编码系统的瞬态性能
    • WO2002093560A1
    • 2002-11-21
    • PCT/US2002/012957
    • 2002-04-25
    • DOLBY LABORATORIES LICENSING CORPORATIONCROCKETT, Brett, G.
    • CROCKETT, Brett, G.
    • G10L19/14
    • G10L19/02G10L19/0212G10L19/022G10L19/025
    • Distortion artifacts preceding a signal transient in an audio signal stream processed by a transform-based low-bit-rate audio coding system employing coding blocks are reduced by detecting a transient in the audio signal stream and shifting the temporal relationship of the transient with respect to the coding blocks such that the time duration of the distortion artifacts is reduced. The audio data is time scaled in such a way that the transients are temporally repositioned prior to quantization in a transform-based low-bit-rate audio encoder so as to reduce the amount of pre-noise in the decoded audio signal. Alternatively, or in addition, in a transform-based low-bit-rate audio coding system, a transient in the audio signal stream is detected and a portion of the distortion artifacts are time compressed such that the time duration of the distortion artifacts is reduced.
    • 通过采用编码块的基于变换的低比特率音频编码系统处理的音频信号流中的信号瞬态之前的失真伪影通过检测音频信号流中的瞬态并将瞬态的时间关系相对于 编码块使得失真伪影的持续时间减少。 音频数据以这样的方式进行时间缩放,使得在基于变换的低比特率音频编码器中的量化之前暂时重新定位瞬变,以便减少解码音频信号中的预噪声量。 或者或另外,在基于变换的低比特率音频编码系统中,检测音频信号流中的瞬态,并且一部分失真伪影被时间压缩,使得失真伪影的持续时间减少 。
    • 10. 发明申请
    • SEGMENTING AUDIO SIGNALS INTO AUDITORY EVENTS
    • 将音频信号分配到审核事件中
    • WO2002097792A1
    • 2002-12-05
    • PCT/US2002/005999
    • 2002-02-26
    • DOLBY LABORATORIES LICENSING CORPORATIONCROCKETT, Brett, G.
    • CROCKETT, Brett, G.
    • G10L11/00
    • G06K9/00536G10L15/04G10L17/26G10L21/04G10L25/00G10L25/48H04N5/04H04N5/60
    • In one aspect, the invention divides an audio signal into auditory events, each of which tends to be perceived as separate and distinct, by calculating the spectral content of successive time blocks of the audio signal (5-1), calculating the difference in spectral content between successive time blocks of the audio signal (5-2), and identifying an auditory event boundary as the boundary between successive time blocks when the difference in the spectral content between such successive time blocks exceeds a threshold (5-3). In another aspect, the invention generates a reduced-information representation of an audio signal by dividing an audio signal into auditory events, each of which tends to be perceived as separate and distinct, and formatting and storing information relating to the auditory events (5-4). Optionally, the invention may also assign a characteristic to one or more of the auditory events (5-5).
    • 在一个方面,本发明通过计算音频信号(5-1)的连续时间块的频谱内容,将音频信号划分为听觉事件,每个听觉事件倾向于被感知为分离和不同,计算频谱差 音频信号(5-2)的连续时间块之间的内容,以及当这些连续时间块之间的频谱内容的差超过阈值(5-3)时,将听觉事件边界识别为连续时间块之间的边界。 在另一方面,本发明通过将音频信号分成听觉事件来生成音频信号的缩减信息表示,每个听觉事件倾向于被认为是分开和不同的,并且格式化和存储与听觉事件有关的信息(5- 4)。 可选地,本发明还可以将特征分配给一个或多个听觉事件(5-5)。