Patent Number: 7,043,423

Title: Low bit-rate audio coding systems and methods that use expanding quantizers with arithmetic coding

Abstract: The perceived quality of an audio signals obtained from very low bit-rate audio coding system is improved by using expanding quantizers and arithmetic coding in a transmitter and using complementary compression and arithmetic decoding in a receiver. An expanding quantizer is used to control the number of signal components that are quantized to zero and arithmetic coding is used to efficiently code the quantized-to-zero coefficients. This allows a wider bandwidth and more accurately quantized baseband signal to be conveyed to the receiver, which regenerates an output signal by synthesizing the missing components.

Inventors: Vinton; Mark Stuart (San Francisco, CA), Truman; Michael Mead (San Francisco, CA)

Assignee: Dolby Laboratories Licensing Corporation

International Classification: G10L 19/02 (20060101)

Expiration Date: 5/09/02018