Bit stream conversion system

• US 8,345,709 B2
• Filed: 06/16/2002
• Issued: 01/01/2013
• Est. Priority Date: 06/16/2001
• Status: Active Grant

• Current Assignee: Harman International Industries Incorporated (Samsung Electronics Co. Ltd.)
• Original Assignee: Harman International Industries Incorporated (Samsung Electronics Co. Ltd.)
• Inventors: Nitzpon, Hans-Juergen, Klaus-Wagenbrenner, Jochen, Teichner, Detlef
• Primary Examiner(s): Hamza, Faruk
• Assistant Examiner(s): CRUTCHFIELD, CHRISTOPHER M
• Application Number:
  US10/479,885
• Publication Number:
  US 20040252036A1
• Time in Patent Office: 3,852 Days
• Field of Search: 370/466, 370/395.64
• US Class Current: 370/466
• CPC Class Codes: G11B 20/00007 Time or data compression or expansion audio compression based on psychoacoustics G10L19/00; data processing for reproducing audio data at different playback speeds G10L21/04; video compression H04N19/00; data compression per se H03M7/30
• CPC Class Codes: G11B 20/10 Digital recording or reproducing
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: H04N 21/23608 Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/4305 Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets arrangements for synchronising receiver with transmitter by comparing receiver clock with transmitter clock H04L7/0012; arrangements for synchronising receiver with transmitter wherein the receiver takes measures against momentary loss of synchronisation H04L7/0083
• CPC Class Codes: H04N 21/4344 Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/438 Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
• CPC Class Codes: H04N 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 7/24 Systems for the transmission of television signals using pulse code modulation H04N21/00 takes precedence

Abstract

A bit-stream converter capable of converting a first synchronous compressed bit-stream of data at a first sampling rate to second synchronous compressed bit-stream frame of data at a second sampling rate is disclosed. The bit-stream converter architecture may include a payload length detector and a zero stuffing unit in signal communication with the payload length detector. The zero stuffing unit is capable of zero stuffing section responsive to the payload length detector detecting the payload length.

Claims

1. A method for converting a first synchronous compressed bit-stream frame of data at a first sampling rate to a second synchronous compressed bit-stream frame of data at a second sampling rate, the method comprising:

receiving the first synchronous compressed bit-stream frame of data;

determining a format for the first compressed bit-stream frame where the first compressed bit-stream frame has a frame length and the first compressed bit-stream frame includes a data-burst section having a preamble section and a payload section having a payload length and a stuffing section having a stuffing length, where the preamble section includes a synchronization word, and where determining the format includes

comparing the synchronization word to a predefined value to determine if a match is found;

starting a counter in response to the synchronization word comparison;

determining the first sampling rate;

zero stuffing the stuffing section responsive to determining the format to convert the first synchronous compressed bit-stream frame of data to the second synchronous compressed bit-stream frame of data; and

transmitting the second synchronous compressed bit-stream frame of data at the second sampling rate.

2. The method of claim 1, wherein zero stuffing includes zero stuffing the stuffing section responsive to the payload length.

3. The method of claim 2, wherein the stuffing length is equal to the frame length minus the payload length.

4. A method for converting a first synchronous compressed bit-stream frame of data at a first sampling rate having zero stuffing to a second synchronous compressed bit-stream frame of data at a second sampling rate, the method comprising:

receiving the first synchronous compressed bit-stream frame of data;

determining a format for the first compressed bit-stream frame where the first compressed bit-stream frame has a frame length and the first compressed bit-stream frame includes a data-burst section having a preamble section and a payload section having a payload length and a stuffing section having a stuffing length, where the preamble section includes a synchronization word, and where determining the format includes

comparing the synchronization word to a predefined value to determine if a match is found;

removing zero stuffing from the stuffing section responsive to determining the format to convert the first synchronous compressed bit-stream frame of data to the second synchronous compressed bit-stream frame of data; and

transmitting the second synchronous compressed bit-stream frame of data at the second sampling rate.

5. The method of claim 4, wherein removing includes removing the zero stuffing from the stuffing section responsive to the payload length.

6. The method of claim 5, wherein the stuffing length is equal to the frame length minus the payload length.

7. A bit-stream converter for converting a first synchronous compressed bit-stream frame of data at a first sampling rate to a second synchronous compressed bit-stream frame of data at a second sampling rate, the bit-stream converter comprising:

a synchronization unit;

a payload length detector;

a frequency detector in signal communication with the synchronization unit and payload length detector;

a zero stuffing unit in signal communication with the payload length detector, the zero stuffing unit capable of zero stuffing the stuffing section responsive to the payload length detector detecting the payload length to convert the first synchronous compressed bit-stream frame of data to the second synchronous compressed bit-stream frame of data;

a counter in signal communication with the synchronization unit and the zero stuffing unit; and

an output for transmitting the second synchronous compressed bit-stream frame of data at the second sampling rate.

8. An inverse bit-stream converter for converting a first synchronous compressed bit-stream frame of data at a first sampling rate having zero stuffing to a second synchronous compressed bit-stream frame of data at a second sampling rate, the bit-stream converter comprising:

a synchronization unit;

a format detector in signal communication with the synchronization unit, the format detector capable of determining a format for the first synchronous compressed bit-stream frame of data;

a zero stuffing removal unit in signal communication with format detector to convert the first synchronous compressed bit-stream frame of data to the second synchronous compressed bit-stream frame of data; and

an output for transmitting the second synchronous compressed bit-stream frame of data at the second sampling rate.

9. A bit-stream converter for converting a first synchronous compressed bit-stream frame of data at a first sampling rate to a second synchronous compressed bit-stream frame of data at a second sampling rate, the bit-stream converter comprising:

means for determining a payload length;

means for synchronization;

a frequency detector in signal communication with the synchronization means and the determining means;

means for zero stuffing a sniffing section responsive to determining the payload length to convert the first synchronous compressed bit-stream frame of data to the second synchronous compressed bit-stream frame of data;

a counter in signal communication with the synchronization means and the zero stuffing means; and

an output for transmitting the second synchronous compressed bit-stream frame of data at the second sampling rate.

10. An inverse bit-stream converter for converting a first synchronous compressed bit-stream frame of data at a first sampling rate having zero stuffing to a second synchronous compressed bit-stream frame of data at a second sampling rate, the bit-stream converter comprising:

means for synchronization;

means for determining a format for the first synchronous compressed bit-stream frame of data;

means for removing the zero stuffing to convert the first synchronous compressed bit-stream frame of data to the second synchronous compressed bit-stream frame of data; and

means for transmitting the second synchronous compressed bit-stream frame of data at the second sampling rate.

11. A non-transitory computer readable medium having a plurality of instructions for converting a first synchronous compressed bit-stream frame of data at a first sampling rate to a second synchronous compressed bit-stream frame of data at a second sampling rate, the plurality of instructions comprising:

instructions for receiving the first synchronous compressed bit-stream frame of data;

instructions for determining a format for the first compressed bit-stream frame where the first compressed bit-stream frame has a frame length and the first compressed bit-stream frame includes a data-burst section having a preamble section and a payload section having a payload length and a stuffing section having a stuffing length, where the preamble section includes a synchronization word, and where determining the format includes

comparing the synchronization word to a predefined value to determine if a match is found;

instructions for starting a counter in response to the synchronization word comparison;

instructions for determining the first sampling rate;

instructions for zero stuffing the stuffing section responsive to determining the format to convert the first synchronous compressed bit-stream frame of data to the second synchronous compressed bit-stream frame of data; and

instructions for transmitting the second synchronous compressed bit-stream frame of data at the second sampling rate.

12. The computer readable medium of claim 11, wherein the instructions for zero stuffing include instructions for zero stuffing the stuffing section responsive to the payload length.

13. The computer readable of claim 12, wherein the stuffing length is equal to the frame length minus the payload length.

14. A non-transitory computer readable medium having a plurality of instructions for converting a first synchronous compressed bit-stream frame of data at a first sampling rate having zero stuffing to a second synchronous compressed bit-stream frame of data at a second sampling rate, the plurality of instructions comprising:

instructions for receiving the first synchronous compressed bit-stream frame of data;

instructions for determining a format for the first compressed bit-stream frame where the first compressed bit-stream frame has a frame length and the first compressed bit-stream frame includes a data-burst section having a preamble section and a payload section having a payload length, and a stuffing section having a stuffing length, where the preamble section includes a synchronization word, and where determining the format includes

comparing the synchronization word to a predefined value to determine if a match is found;

instructions for removing zero stuffing from the stuffing section responsive to determining the format to convert the first synchronous compressed bit-stream frame of data to the second synchronous compressed bit-stream frame of data; and

instructions for transmitting the second Synchronous compressed bit-stream frame of data at the second sampling rate.

15. The computer readable medium of claim 14, wherein the instructions for removing zero stuffing include instructions for removing the zero stuffing from the stuffing section responsive to the payload length.

16. The computer readable medium of claim 15, wherein the stuffing length is equal to the frame length minus the payload length.