System and method for audio data compression and decompression using discrete wavelet transform (DWT)

A system for audio data processing including a sub-system for audio data compression comprising:

• an analog to digital converter converting analog audio signals into digital audio signals;
• a segment-based multi-channel splitter splitting the digital audio signals into multiple audio channels and segmenting split signals in each of the multiple audio channels into a plurality of segments;
• a plurality of multi-level 1D discrete wavelet transformers each of which discrete wavelet transforms one-dimensionally for a respective one of the multiple audio channels each of the segments thereof in sequence and recursively through a predetermined number of filtering levels into wavelet coefficients;
• a plurality of guantizers each of which quantizes for the respective channel the wavelet coefficients thereof;
• a multiplexer multiplexing Quantized wavelet coefficients of the multiple audio channels into a plurality of 2-D arrays;
• an embedded block coder coding the 2-D arrays into a plurality of code blocks, discarding some of the code blocks, truncating a bit stream embedded in each of the remaining code blocks, and stringing the truncated bit stream embedded in each of the remaining code blocks into a compressed data stream;
• RAM;
• and
• means for retrieving multiple sample data in at least three columns of each of the code blocks with connected-neighbor data and storing the retrieved data in the RAM.

A system for audio data processing including

• (1) a sub-system for audio data compression comprising:
• an analog to digital converter converting analog audio signals into digital audio signals;
• a segment-based multi-channel splitter splitting the digital audio signals into multiple audio channels and segmenting split signals in each of the multiple audio channels into a plurality of segments;
• a plurality of multi-level 1D discrete wavelet transformers each of which discrete wavelet transforms one-dimensionally for a respective one of the multiple audio channels each of the segments thereof in sequence and recursively through a predetermined number of filtering levels into wavelet coefficients;
• a plurality of quantizers each of which quantizes for the respective channel the wavelet coefficients thereof;
• a multiplexer multiplexing quantized wavelet coefficients of the multiple audio channels into a plurality of 2-D arrays;
• and
• an embedded block coder coding the 2-D arrays into a plurality of code blocks, discarding some of the code blocks, truncating a bit stream embedded in each of the remaining code blocks, and stringing the truncated bit stream embedded in each of the remaining code blocks into a compressed data stream,
• (2) a sub-system for audio data de-compression comprising:
• an embedded block decoder decoding the compressed data stream to provide a plurality of 2-D arrays containing wavelet coefficients in segments;
• a de-multiplexer de-multiplexing the wavelet coefficients of the 2-D arrays into the multiple audio channels;
• a plurality of de-quantizers each of which de-quantizes for a respective one of the multiple audio channels the decoded wavelet coefficients thereof into de-quantized wavelet coefficients in different levels;
• a plurality of multi-level 1-D inverse discrete wavelet transformers each of which inversely discrete wavelet transforms one-dimensionally for the respective channel the de-quantized wavelet coefficients in different levels in each of the segments thereof in sequence into digital audio data in segments;
• a segment-based multi-channel mixer mixing the digital audio data in segments of the multiple audio channels into a stream of digital audio data;
• and
• a digital to analog converter converting the digital audio data into analog audio signals.

A system for audio data processing including a sub-system for audio data compression comprising:

• an analog to digital converter converting analog audio signals into digital audio signals;
• a segment-based multi-channel splitter splitting the digital audio signals into multiple audio channels and segmenting split signals in each of the multiple audio channels into a plurality of segments;
• a plurality of multi-level 1D discrete wavelet transformers each of which discrete wavelet transforms one-dimensionally for a respective one of the multiple audio channels each of the segments thereof in sequence and recursively through a predetermined number of filtering levels into wavelet coefficients;
• a plurality of quantizers each of which quantizes for the respective channel the wavelet coefficients thereof;
• a multiplexer multiplexing quantized wavelet coefficients of the multiple audio channels into a plurality of 2-D arrays;
• and
• an embedded block coder coding the 2-D arrays into a plurality of code blocks, discarding some of the code blocks, truncating a bit stream embedded in each of the remaining code blocks, and stringing the truncated bit stream embedded in each of the remaining code blocks into a compressed data stream,
• wherein the sub-system for audio data compression further comprises means including a sub-system for audio data compression comprising;
• an analog to digital converter converting analog audio signals into digital audio signals;
• a segment-based multi-channel splitter splitting the digital audio signals into multiple audio channels and segmenting split signals in each of the multiple audio channels into a plurality of segments;
• a plurality of multi-level 1D discrete wavelet transformers each of which discrete wavelet transforms one-dimensionally for a respective one of the multiple audio channels each of the segments thereof in sequence and recursively through a predetermined number of filtering levels into wavelet coefficients:
• a plurality of quantizers each of which quantizes for the respective channel the wavelet coefficients thereof;
• a multiplexer multiplexing quantized wavelet coefficients of the multiple audio channels into a plurality of 2-D arrays;
• an embedded block coder coding the 2-D arrays into a plurality of code blocks, discarding some of the code blocks, truncating a bit stream embedded in each of the remaining code blocks, and stringing the truncated bit stream embedded in each of the remaining code blocks into a compressed data stream;
• and
• means for rotating each of the 2D-arrays to a new orientation for bit-plane memory access for rotating each of the 2D-arrays to a new orientation for bit-plane memory access,
• wherein said means for rotating maps data addresses in each the 2D-arrays with the new orientation thereby retrieving data thereform by bit-plane therein.

A system for audio data processing including a sub-system for audio data compression comprising:

• an analog to digital converter converting analog audio signals into digital audio signals;
• a segment-based multi-channel splitter splitting the digital audio signals into multiple audio channels and segmenting split signals in each of the multiple audio channels into a plurality of segments;
• a plurality of multi-level 1D discrete wavelet transformers each of which discrete wavelet transforms one-dimensionally for a respective one of the multiple audio channels each of the segments thereof in sequence and recursively through a predetermined number of filtering levels into wavelet coefficients;
• a plurality of quantizers each of which quantizes for the respective channel the wavelet coefficients thereof;
• a multiplexer multiplexing quantized wavelet coefficients of the multiple audio channels into a plurality of 2-D arrays;
• an embedded block coder coding the 2-D arrays into a plurality of code blocks, discarding some of the code blocks, truncating a bit stream embedded in each of the remaining code blocks, and stringing the truncated bit stream embedded in each of the remaining code blocks into a compressed data stream;
• means for rotating each of the 2D-arrays to a new orientation for bit-plane memory access;
• and
• an OR-Bitmax finder for finding a maximum number of bits in each of the 2-D arrays by counting bits starting on a first non-zero bit from the most significant bit in each of the wavelet coefficients.

A system for audio data processing including a sub-system for audio data compression comprising:

• an analog to digital converter converting analog audio signals into digital audio signals;
• a non-segment-based multi-channel splitter splitting digital audio signals into multiple audio channels without segmenting signals in each of the multiple audio channels;
• a plurality groups of 1D discrete wavelet transformers, each of the groups including a predetermined number of 1D discrete wavelet transformers which discrete wavelet transform one-dimensionally for a respective one of the multiple audio channels split signals thereof and through the predetermined number of filtering levels into wavelet coefficients;
• a plurality of quantizers each of which quantizes for the respective channel the wavelet coefficients thereof;
• a multiplexer multiplexing quantized wavelet coefficients of the multiple audio channels into one data stream and segmenting the data stream into segments;
• an embedded block coder coding the segments into a plurality of code blocks, discarding some of the code blocks, truncating a bit stream embedded in each of the remaining code blocks, and stringing the truncated bit stream embedded in each of the remaining code blocks into a compressed data stream;
• means for rotating each of the 2D-arrays to a new orientation for bit-plane memory access;
• and
• an OR-Bitmax finder for finding a maximum number of bits in each of the 2-D arrays by counting bits starting on a first non-zero bit from the most significant bit in each of the wavelet coefficients.

A system for audio data processing including a sub-system for audio data compression comprising:

• an analog to digital converter converting analog audio signals into digital audio signals;
• a non-segment-based multi-channel splitter splitting digital audio signals into multiple audio channels without segmenting signals in each of the multiple audio channels;
• a plurality groups of 1D discrete wavelet transformers, each of the groups including a predetermined number of 1D discrete wavelet transformers which discrete wavelet transform one-dimensionally for a respective one of the multiple audio channels split signals thereof and through the predetermined number of filtering levels into wavelet coefficients;
• a plurality of quantizers each of which quantizes for the respective channel the wavelet coefficients thereof;
• a multiplexer multiplexing quantized wavelet coefficients of the multiple audio channels into one data stream and segmenting the data stream into segments;
• an embedded block coder coding the segments into a plurality of code blocks, discarding some of the code blocks, truncating a bit stream embedded in each of the remaining code blocks, and stringing the truncated bit stream embedded in each of the remaining code blocks into a compressed data stream;
• RAM;
• and
• means for retrieving multiple sample data in a column of each of the code blocks with connected-neighbor data and storing the retrieved data in the RAM.

A system for audio data processing including a sub-system for audio data compression comprising:

• an analog to digital converter converting analog audio signals into digital audio signals;
• a non-segment-based multi-channel splitter splitting digital audio signals into multiple audio channels without segmenting signals in each of the multiple audio channels;
• a plurality groups of 1D discrete wavelet transformers, each of the groups including a predetermined number of 1D discrete wavelet transformers which discrete wavelet transform one-dimensionally for a respective one of the multiple audio channels split signals thereof and through the predetermined number of filtering levels into wavelet coefficients;
• a plurality of quantizers each of which quantizes for the respective channel the wavelet coefficients thereof;
• a multiplexer multiplexing quantized wavelet coefficients of the multiple audio channels into one data stream and segmenting the data stream into segments;
• an embedded block coder coding the segments into a plurality of code blocks, discarding some of the code blocks, truncating a bit stream embedded in each of the remaining code blocks, and stringing the truncated bit stream embedded in each of the remaining code blocks into a compressed data stream;
• means for rotating each of the 2D-arrays to a new orientation for bit-plane memory access,
• wherein said means for rotating maps data addresses in each the 2D-arrays with the new orientation thereby retrieving data thereform by bit-plane therein.