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AssigneeDigital Recording Research Limited Partnership
InventorsCharles S. Weaver, Robert A. LeBlanc, Lawrence E. Sweeney, Jr.
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A music data compression system is disclosed which includes an analog to digital converter for converting the analog music signal to digital sample signal form, a digital compression filter for compression filtering the digital sample signals, and an encoder for truncated Huffman encoding the compression filter output. An entropy setting unit is included in the system for step control of the signal supplied to the digital compression filter in accordance with one or more threshold levels of the envelope of the music signal, and for reducing the entropy of the signal with increases in the energy level of the music signal. Different codes may be implemented in accordance with the threshold(s), and an identifying code word is inserted in the Huffman encoded stream. A decoder, digital reconstruction filter, and digital to analog converter are used to reconstruct the analog music signal. The identifying code word in the encoded signal stream to the decoder is used to select the necessary algorithm for decoding, and an entropy setting unit is included for step control of the gain of the digital reconstruction filter output under control of the identifying code word when step gain control is included prior to compression filtering.
In a data reduction system of the type for preparing varying average energy level analog input signals for storage or transmission, the combination comprising
Digital decoding and decompression means for producing digital signals f.sub.n (out) from a stream of encoded digital compressed signals, different portions of said stream having been encoded using different codes, said stream including an identifying code word at the start of each portion of the stream encoded using a different code, said digital decoder and decompression means comprising,
In a data compression method for preparing analog input signals having a substantially Gaussian distribution for storage or transmission, which method includes converting the analog input signal to a digital sample signal stream of equal word length sample signals, digital compression filtering said sample signal stream for generating a stream of compressed signals of equal word length, and digital encoding the compressed signal stream to generate a stream of variable word length encoded compressed signals, the improvement including,
In a data compression method for preparing a digital sample signal stream of equal word length sample signals including digital sample signal streams having a substantially Gaussian distribution for storage or transmission, which method includes digital compression filtering said sample signal stream for generating a stream of compressed signals, and digital encoding the compressed signal stream to generate a stream of variable word length encoded compressed signals, the improvement including,
In a data compression method for preparing analog input signals including those having a substantially Gaussian distribution for storage or transmission, which method includes converting the analog input signal to a digital sample signal stream, digital compression filtering said sample signal stream for generating a stream of compressed signals, and digital encoding the compressed signal stream using a truncated variable word length code to generate a stream of variable word length encoded compressed signals, the improvement comprising,
In a data reduction system of the type for preparing a digital sample signal stream of equal word length sample signals for storage or transmission,
Dependencies are inferred from the claim text.