Method and system for encoding a digital signal

United States Patent

[19]

VanBuskirk

US005841387A [ii] Patent Number: 5,841,387 [45] Date of Patent: Nov. 24, 1998

[54] METHOD AND SYSTEM FOR ENCODING A DIGITAL SIGNAL

[75] Inventor: James E. VanBuskirk, Richmond, Tex.

[73] Assignee: Texas Instruments Incorporated,

Dallas, Tex.

[21] Appl. No.: 116,233
[22] Filed: Sep. 1, 1993

[51] Int. CI.6 H03M 1/00; G11B 5/02

[52] U.S. CI 341/155; 341/110; 341/144;

360/32

[58] Field of Search 341/155, 157,

341/110, 123, 144; 360/32; 84/1.01, 625;

375/106; 370/100

[56] References Cited

U.S. PATENT DOCUMENTS

4,649,783 3/1987 Strong et al 84/1.01

4,729,123 3/1988 Wheen 370/100

4,763,207 8/1988 Podolack et al 360/32

4,772,873 9/1988 Duncan 341/110

4,856,030 8/1989 Batzer et al 375/106

4,893,316 1/1990 Jane et al 375/44

5,241,129 8/1993 Muto et al 84/625

Primary Examiner—-John W. Cabeca

Assistant Examiner—Marlon T. Fletcher

Attorney, Agent, or Firm—Richard L. Donaldson; W. James

Brady, III; Warren L. Franz

[57] ABSTRACT

A method and system ol representing a signal is disclosed herein. A digital representation ol an analog signal is received by a bandwidth detection circuit 14. The digital signal typically, but not necessarily, comes from a analogto-digital converter 12. The a bandwidth ol the signal is determined. The bandwidth is compared to a selected threshold bandwidth. A selected portion ol the digital representation is stored in a memory unit 16. The selected portion is determined by a result ol the comparison step. A code word is also generated by the bandwidth detection circuit 14 and stored in the memory circuit 16. The original analog signal can be recreated with a decode circuit 20.

15 Claims, 12 Drawing Sheets