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1. 发明授权

US5654990A Real-time digital audio compression/decompression system 失效
标题翻译：实时数字音频压缩/解压系统
公开(公告)号：US5654990A
公开(公告)日：1997-08-05
申请号：US670482
申请日：1996-06-26
申请人： Ronald Henry Jones, Jr.
发明人： Ronald Henry Jones, Jr.
IPC分类号： G06F5/00 , G10L19/00 , G11B20/00 , H03M7/36 , H04B14/06 , H04B1/66
CPC分类号： G11B20/00007 , H04B14/06 , H04B14/066
摘要： Digitized audio information is compressed by retrieving a first audio sample from a digitized audio signal and storing it in its entire, uncompressed, form. The next audio sample is then retrieved and a signed difference between the first audio sample value and the next audio sample value is computed. If this difference value can be represented in fewer data segments than would be required to represent the next audio sample, the difference value is stored, rather than the value of the next sample, otherwise the next sample is stored. The invention proceeds in this fashion until the entire PCM audio signal is compressed and stored. The compressed data stream is decompressed to generate an output data stream by retrieving a stored sample and examining it to ascertain whether it is a difference value or a flag which indicates that the following data represents a coded amplitude value. If the sample is a difference value it is digitally added to the previous value (taking into account the sign) and the sum is inserted into the output data stream. The sum value is retained in order to be used to compute the next output value if the following sample is also a difference value. Alternatively, if the sample is a flag value it is discarded and the next sample is retrieved and inserted into the output data stream.
摘要翻译：通过从数字化音频信号中检索第一音频样本并将其存储在其整个未压缩的形式中，数字化的音频信息被压缩。然后检索下一个音频样本，并计算第一音频采样值和下一个音频采样值之间的有符号差。如果该差值可以以比代表下一个音频采样所需的数据段更少的数据段表示，则存储差值而不是下一个样本的值，否则存储下一个样本。本发明以这种方式进行，直到整个PCM音频信号被压缩和存储。解压缩压缩数据流以通过检索存储的样本并检查其来确定其是否是差值，或者指示以下数据表示编码幅度值的标志来生成输出数据流。如果样本是差分值，则将其数字地添加到先前值（考虑到符号），并将和插入到输出数据流中。如果以下样本也是差值，则保留总和值以便用于计算下一个输出值。或者，如果样本是标志值，则它被丢弃并且下一个样本被检索并插入到输出数据流中。

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