Multi-precision technique for digital audio encoder

A digital audio transform encoder for coding a digital audio data block into compressed audio data, comprising:

• a fixed point digital signal processor having multiple levels of computation precision;
• and
• transform encoding process code stored in firmware or software for controlling the digital signal processor, wherein the transform encoding process code includes a plurality of computation blocks involving arithmetic operations in transforming the digital audio data block into compressed audio data, and wherein different ones of the computation blocks are performed on the digital audio data block by the digital signal processor using different levels of computational precision, wherein the transform encoding process code is in accordance with AC-3 Digital Audio Compression Standard, wherein the plurality of computation blocks include transient detection, windowing, frequency transformation, coupling strategy determination and coupling channel computation, and rematrixing determination and computation.

A digital audio transform encoder for coding a digital audio data block into compressed audio data, comprising:

• a fixed point digital signal processor having multiple levels of computation precision;
• and
• transform encoding process code stored in firmware or software for controlling the digital signal processor, wherein the transform encoding process code includes a plurality of computation blocks involving arithmetic operations in transforming the digital audio data block into compressed audio data, and wherein different ones of the computation blocks are performed on the digital audio data block by the digital signal process using different levels of computational precision, wherein the transform encoding process code is in accordance with AC-3 Digital Audio Compression Standard, wherein the transform encoding process code includes a transient detection block for detecting transients in the audio data, and wherein the transient detection block utilizes single precision computations.

A digital audio transform encoder for coding a digital audio data block into compressed audio data, comprising:

• a fixed point digital signal processor having multiple levels of computation precision;
• and
• transform encoding process code stored in firmware or software for controlling the digital signal processor, wherein the transform encoding process includes a plurality of computation blocks involving arithmetic operations in transforming the digital audio data block into compressed audio data, and wherein different ones of the computation blocks are performed on the digital audio data block by the digital signal processor using different levels of computational precision, wherein the transform encoding process code is in accordance with AC-3 Digital Audio Compression Standard, wherein the transform encoding process code include a windowing block which utilizes single precision audio data and double precision coefficients.

A digital audio transform encoder for coding a digital audio data block into compressed audio data, comprising:

• a fixed point digital signal processor having multiple levels of computation precision;
• and
• transform encoding process code stored in firmware or software for controlling the digital signal processor, wherein the transform encoding process code includes a plurality of computation blocks involving arithmetic operations in transforming the digital audio data block into compressed audio data, and wherein different ones of the computation blocks are performed on the digital audio data block by the digital signal processor using different levels of computational precision, wherein the transform encoding process code is in accordance with AC-3 Digital Audio Compression Standard, wherein the encoding process code includes a windowing block which utilizes double precision audio data and single precision coefficients.

A digital audio transform encoder for coding a digital audio data block into compressed audio data, comprising:

• a fixed point digital signal processor having multiple levels of computation precision;
• and
• transform encoding process code stored in firmware or software for controlling the digital signal processor, wherein the transform encoding process code includes a plurality of computation blocks involving arithmetic operations in transforming the digital audio data block into compressed audio data, and wherein different ones of the computation blocks are performed on the digital audio data block by the digital signal processor using different levels of computational precision, wherein the transform encoding process code is in accordance with AC-3 Digital Audio Compression Standard, wherein the transform encoding process code includes a frequency transformation block which utilizes double precision data and single precision coefficients.

A digital audio transform encoder for coding a digital audio data block into compressed audio data, comprising:

• a fixed point digital signal processor having multiple levels of computation precision;
• and
• transform encoding process code stored in firmware or software for controlling the digital signal processor, wherein the transform encoding process code includes a plurality of computation blocks involving arithmetic operations in transforming the digital audio data block into compressed audio data, and wherein different ones of the computation blocks are performed on the digital audio data block by the digital signal processor using different levels of computational precision, wherein the transform encoding process code is in accordance with AC-3 Digital Audio Compression Standard, wherein the transform encoding process code includes a block for determination of a coupling strategy and/or a phase strategy, and wherein the determination utilizes single precision data.

A digital audio transform encoder for coding a digital audio data block into compressed audio data, comprising:

• a fixed point digital signal processor having multiple levels of computation precision;
• and
• transform encoding process code stored in firmware or software for controlling the digital signal processor, wherein the transform encoding process code includes a plurality of computation blocks involving arithmetic operations in transforming the digital audio data block into compressed audio data, and wherein different ones of the computation blocks are performed on the digital audio data block by the digital signal processor using different levels of computational precision, wherein the transform encoding process code is in accordance with AC-3 Digital Audio Compression Standard, wherein the transform encoding process code includes a rematrixing determination block which utilizes single precision data, and a rematrix coding block which utilizes double precision data.

A digital audio transform encoder for coding digital audio data into compressed audio data in accordance with an AC-3 Digital Audio Compression Standard, comprising:

• a first computation block structured to perform arithmetic operations in transforming the digital audio data into the compressed audio data using a first level of computational precision;
• and
• a second computation block coupled to the first computation block and structured to perform arithmetic operations in transforming the digital audio data into the compressed audio data in concert with the first computation block, the second computation block using a second level of computational precision that is different from the first level of computational precision, wherein the first computation block includes a transient detection block for detecting transients in the audio data, and wherein the transient detection block utilizes single precision computations.