System and method for lossless audio encoding and decoding

• US 20050256722A1
• Filed: 05/14/2004
• Published: 11/17/2005
• Est. Priority Date: 05/14/2004
• Status: Abandoned Application

• Current Assignee: Adams Platform Pty Limited, The World of Adams Platform Pty., Ltd.
• Original Assignee: Adams Platform Pty Limited
• Inventors: Clark, Adam Leslie
• Application Number:
  US10/845,644
• Publication Number:
  US 20050256722A1
• Time in Patent Office: Days
• US Class Current: 704/500
• CPC Class Codes: G10L 19/0017 Lossless audio signal coding; Perfect reconstruction of coded audio signal by transmission of coding error G10L19/24 takes precedence

Abstract

Audio information is encoded, sample by sample, by creating a table of encoded audio sample values in which redundant ones of the encoded audio sample values share common table entries. The encoding method may include comparing a current audio data sample to be encoded to previously encoded audio data samples to determine if the current audio data sample value is a redundant value, and if it is a redundant value, a pointer to the table location of the first occurrence of the redundant previously encoded audio data value is entered into the table of encoded audio sample values.

Claims

1. A method to encode audio data, comprising for each sample of a plurality of audio data samples creating a table of encoded audio sample values in which redundant ones of the audio data samples share common table entries.

2. The method of claim 1, further comprising comparing a current audio data sample to be encoded to previously encoded ones of the audio data samples to determine if the current audio data sample is a redundant audio data sample.

3. The method of claim 2, wherein if the current audio data sample is a redundant audio data sample a pointer to a location in the table of encoded audio sample values of a previous occurrence of an encoded audio data value corresponding to the redundant audio data sample is inserted in the table of encoded audio sample values in place of the redundant audio data sample.

4. The method of claim 1, wherein the plurality of audio data samples is a plurality of uncompressed digitized audio samples.

5. The method of claim 1, wherein the plurality of audio data samples is a plurality of compressed digitized audio samples.

6. The method of claim 1, further comprising transmitting the table of encoded audio sample values to a receiver.

7. The method of claim 6, further comprising decoding the table of encoded audio sample values at the receiver.

8. A system comprising:

an encoder to encode successive audio data samples from a digital audio file by creating a table of encoded audio sample values in which redundant ones of the audio data samples share common table entries; and

a decoder to create from the table of encoded audio sample values a decoded digital audio file for playback.

9. The system of claim 8, wherein the encoder is configured to compare a current audio data sample to be encoded to previously encoded audio data samples to determine if the current audio data sample value is a redundant audio data sample.

10. The system of claim 9, wherein if the current audio data sample is a redundant data sample, a pointer to a location of an occurrence of a corresponding previously encoded audio data value is inserted in the table of encoded audio sample values in place of the redundant data sample.

11. The system of claim 8, wherein the plurality of audio data samples is a plurality of uncompressed digitized audio samples.

12. The system of claim 8, wherein the plurality of audio data samples is a plurality of compressed digitized audio samples.

13. A set of computer readable instructions embodied on a computer-readable medium, which when executed by a computer processor cause the computer processor to execute a process comprising encoding, sample by sample, a plurality of audio data samples by creating a table of encoded audio sample values in which redundant ones of the audio data samples share common table entries.