Isochronous interface method

• US 5,317,604 A
• Filed: 12/30/1992
• Issued: 05/31/1994
• Est. Priority Date: 12/30/1992
• Status: Expired due to Fees

• Current Assignee: GTE Government Systems Corporation (General Dynamics Corporation)
• Original Assignee: GTE Government Systems Corporation (General Dynamics Corporation)
• Inventors: Osterweil, Josef
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Kobayashi, Duane
• Application Number:
  US07/999,477
• Time in Patent Office: 517 Days
• Field of Search: 375/122, 375/118, 370/118, 358/133, 358/426, 358/430, 381/29
• US Class Current: 375/240
• CPC Class Codes: H03M 7/3084 using adaptive string matching, e.g. the Lempel-Ziv method
• CPC Class Codes: H03M 7/48 alternating with other codes during the code conversion process, e.g. run-length coding being performed only as long as sufficientlylong runs of digits of the same kind are present
• CPC Class Codes: H04J 3/0626 plesiochronous multiplexing systems, e.g. plesiochronous digital hierarchy [PDH], jitter attenuators
• CPC Class Codes: H04J 3/1688 the demands of the users being taken into account after redundancy removal, e.g. by predictive coding, by variable sampling reducing bandwidth of signals in general H04B1/66; in PCM-systems H04B14/046; removal of redundancy in telegraph communication H03M7/30

Abstract

Method of transferring isochronous data from a source over a clocked channel to a sink. The data is compressed by a compression ratio responsive to a depth of a first variable stack. The compressed data is stored in the first stack and clocked by the channel. Compressed data on the channel is expanded and stored in a second variable stack. The variable stack is clocked to maintain the second variable stack at a constant depth.

Claims

1. Method of transferring isochronous data having a data rate from a source over a clocked channel having a traffic rate to a destination comprising the steps of:

compressing said data by a compression ratio responsive to a depth of a first variable stack;

storing compressed data in said first variable stack;

clocking said first variable stack by said channel at said traffic rate;

expanding compressed data from said channel;

storing expanded data in a second variable stack; and

clocking said second variable stack at a clock rate to maintain said second variable stack at a constant depth, said clock rate equal to said data rate.