Self-initialized coder and method thereof

• US 5,745,524 A
• Filed: 01/26/1996
• Issued: 04/28/1998
• Est. Priority Date: 01/26/1996
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Hull, Andrew William
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): WEBSTER, BRYAN E
• Application Number:
  US08/592,755
• Time in Patent Office: 823 Days
• Field of Search: 375/244, 375/245, 375/231, 341/143
• US Class Current: 375/244
• CPC Class Codes: H04B 14/06 using differential modulation, e.g. delta modulation

Abstract

A self initialized coder and method thereof, the coder arranged and constructed for decoding an information stream, the coder including a buffer (301) for storing a portion (403) of the information stream, a controller (313) coupled to the buffer for temporally reversing a first part (401) of the portion to provide a file header (415), and an adaptive decoder (213) having a state parameter, the adaptive decoder, coupled to the controller and the buffer, for decoding the file header to provide an estimate of the state parameter and thereafter for decoding, using the estimate, the portion to provide a decoded signal.

Claims

1. In a communications receiver adapted to receive an information stream, the information stream encoded by a coder, a method of initializing a coder decoding the information stream, the method including the steps of:

storing a portion of the information stream,

reversing, temporally, a first part of said portion to provide a file header,

first decoding said file header to provide an estimate of the state parameter, and thereafter

second decoding, using said estimate, said portion of the information stream to provide a decoded signal.

2. The method of claim 1 further including a step of determining that said portion is temporally out of sequence.

3. The method of claim 1 further including selecting said first part such that said file header has statistical properties representative of said portion.

4. The method of claim 3 wherein said step of selecting said first part further includes a step of choosing a predetermined time duration for said first part.

5. The method of claim 4 wherein said step of choosing said predetermined time duration is such that said first part has statistical properties representative of said portion.

6. The method of claim 5 wherein said step of choosing said predetermined time duration is such that said first part has a minimum time duration.

7. The method of claim 1 wherein said step of temporally reversing said first part includes a step of aligning an earliest portion of said first part such that continuity of an amplitude characteristic and a phase characteristic is maintained between said file header and said portion.

8. The method of claim 7 wherein said step of temporally reversing said first part further provides a reversed first part and includes a step of combining said first part and said reversed first part to provide said file header.

9. A self initialized coder arranged and constructed for decoding an information stream, the coder comprising in combination;

a buffer for storing a portion of the information stream,

a controller coupled to said buffer for temporally reversing a first part of said portion to provide a file header, and

an adaptive decoder having a state parameter, said adaptive decoder, coupled to said controller and said buffer, for decoding said file header to provide an estimate of said state parameter and thereafter for decoding, using said estimate, said portion to provide a decoded signal.

10. The self initialized coder of claim 9 wherein said controller determines when said portion is temporally out of sequence.

11. The self initialized coder of claim 9 wherein said controller further selects said first part such that said file header has statistical properties representative of said portion.

12. The self initialized coder of claim 11 wherein said controller further chooses a predetermined time duration for said first part.

13. The self initialized coder of claim 12 wherein said controller further chooses said predetermined time duration such that said first part has statistical properties representative of said portion.

14. The self initialized coder of claim 13 wherein said controller further chooses said predetermined time duration in accordance with a processing latency for said portion.

15. The self initialized coder of claim 9 wherein said controller further aligns an earliest part of said first part such that continuity of an amplitude characteristic and a phase characteristic is maintained between said file header and said portion.

16. The self initialized coder of claim 15 wherein said controller further provides a reversed first part and includes a function of combining said first part and said reversed first part to provide said file header.

17. A self initialized data receiver arranged and constructed for receiving an information stream, the data receiver comprising in combination;

a front end for demodulating a carrier to provide an information stream,

a processor coupled to said front end for storing a portion of said information stream and for temporally reversing a first part of said portion to provide a file header, and

an adaptive decoder having a state parameter and coupled to said processor for decoding said file header to provide an estimate of said state parameter and thereafter for decoding, using said estimate, said portion to provide a decoded signal.

18. The self initialized data receiver of claim 17 wherein said processor determines when said portion is temporally out of sequence.

19. The self initialized data receiver of claim 17 wherein said processor further selects said first part such that said file header has statistical properties representative of said portion.

20. The self initialized data receiver of claim 19 wherein said processor further chooses a predetermined time duration for said first part.

21. The self initialized data receiver of claim 20 wherein said processor further chooses said predetermined time duration such that said first part has statistical properties representative of said portion.

22. The self initialized data receiver of claim 21 wherein said processor further chooses said predetermined time duration in accordance with a processing latency for said portion.

23. The self initialized data receiver of claim 17 wherein said processor further aligns an earliest part of said first part such that continuity of an amplitude characteristic and a phase characteristic is maintained between said file header and said portion.

24. The self initialized data receiver of claim 23 wherein said processor further provides a reversed first part and includes a step of combining said first part and said reversed first part to provide said file header.