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    • 4. 发明授权
    • Digital audio encoder with window size depending on voice multiplex data
presence
    • 具有窗口大小的数字音频编码器取决于语音复用数据存在
    • US5732386A
    • 1998-03-24
    • US487275
    • 1995-06-07
    • Seong-Wan ParkJung-Sik Yoon
    • Seong-Wan ParkJung-Sik Yoon
    • H04H20/88G01L3/02H04H5/00
    • H04H20/88
    • A digital audio encoder that enables the digital signal processing of a stereo audio signal and multiplexed voice data by extending a two-channel digital audio system of comparatively simple construction. Stereo audio data and multiplexed voice data are sampled and scaled for adjusting the range of the signals. Thereafter, a window is applied to the data. With the window, adjacent blocks are overlapped in order to eliminate noise between the blocks. MDCT and MDST functions are performed using the same size window for extracting and normalizing MDCT and MDST coefficients which respectively indicate an exponent and a mantissa. The mantissa consists of fixed bit data and variable bit data. In order to determine the fixed bit data, fixed bit data are allocated on a sub-band basis. In order to determine the variable bit data, each of the remaining bits are allocated on a sub-band basis from the lowest frequency band. Thereafter, quantization is performed. If multiplexed voice data is not present, 512 pieces of data are processed in each frame. If multiplexed voice data is present, 1024 pieces of data are processed in each frame.
    • 一种数字音频编码器,通过扩展相对简单结构的双声道数字音频系统,实现立体声音频信号的数字信号处理和复用的语音数据。 对立体声音频数据和复用的语音数据进行采样和缩放,以调整信号的范围。 此后,将窗口应用于数据。 通过窗口,相邻块重叠以消除块之间的噪声。 使用相同大小的窗口执行MDCT和MDST功能,用于提取和归一化分别表示指数和尾数的MDCT和MDST系数。 尾数由固定位数据和可变位数组成。 为了确定固定位数据,固定位数据被分配在子带的基础上。 为了确定可变比特数据,从最低频带基于子带分配剩余比特中的每一个。 此后,进行量化。 如果多路复用语音数据不存在,则在每帧中处理512个数据。 如果存在复用的语音数据,则在每帧中处理1024个数据。