System and method for sending a message type identifier through an in-band modem

• US 8,150,686 B2
• Filed: 06/28/2010
• Issued: 04/03/2012
• Est. Priority Date: 06/05/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Joetten, Christoph A, Sgraja, Christian, Pietsch, Christian, Werner, Marc W
• Primary Examiner(s): MCFADDEN, SUSAN IRIS
• Application Number:
  US12/824,746
• Publication Number:
  US 20100312554A1
• Time in Patent Office: 645 Days
• Field of Search: 704/227
• US Class Current: 704/227
• CPC Class Codes: G10L 19/00 Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis in musical instruments G10H
• CPC Class Codes: G10L 19/008 Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
• CPC Class Codes: G10L 19/018 Audio watermarking, i.e. embedding inaudible data in the audio signal
• CPC Class Codes: H04J 3/0611 PN codes H04J3/0608 takes precedence
• CPC Class Codes: H04L 25/4902 Pulse width modulation; Pulse position modulation

Abstract

A system and method is provided for sending a message type identifier through a speech codec (in-band) such as found in a wireless communication network. A first predetermined sequence with noise-like characteristics identifies a first message type. A second predetermined sequence with noise-like characteristics identifies a second message type.

Claims

1. A method of sending a message type identifier through a speech codec comprising:

generating a first predetermined sequence comprising a function of a pseudorandom noise sequence, where the first predetermined sequence has noise-like characteristics and wherein the first predetermined sequence comprises bit patterns for use in generating correlation peaks that provide the predetermined sequence with a robustness to speech frame errors;

generating a second predetermined sequence different from the first predetermined sequence;

sending the first predetermined sequence through the speech codec, wherein the first predetermined sequence is used to identify a first message type; and

sending the second predetermined sequence through the speech codec, wherein the second predetermined sequence is used to identify a second message type.

2. The method of claim 1 wherein the predetermined sequences are further used for synchronizing non-speech frames through the speech codec.

3. The method of claim 2 wherein the start of the non-speech frame boundaries is at least dependent on a distance from a time offset within the predetermined sequence to a reference time instance.

4. The method of claim 3 wherein the reference time instance is a function of the speech codec frame boundary.

5. The method of claim 1 wherein the function of a pseudorandom noise sequence is comprised of concatenating a plurality of pseudorandom noise sequences.

6. The method of claim 1 wherein the function of a pseudorandom noise sequence is comprised of concatenating a plurality of pseudorandom noise sequences with a plurality of overlapped and combined pseudorandom noise sequences.

7. The method of claim 6 wherein at least one of the pseudorandom noise sequences is inverted.

8. The method of claim 1 wherein each sample of the predetermined sequences is separated by at least one sample of value binary 0.

9. The method of claim 1 further comprising generating a wakeup signal prior to the predetermined sequences to prohibit the speech codec from entering an inactive state.

10. The method of claim 9 wherein the inactive state is a discontinuous transmission state.

11. The method of claim 9 wherein the inactive state is the lowest transmission rate in a set of transmission rates.

12. A non-transitory memory storing a computer program that, when executed, causes a computer to perform the acts of:

generating a first predetermined sequence comprising a function of a pseudorandom noise sequence, where the first predetermined sequence has noise-like characteristics and wherein the first predetermined sequence comprises bit patterns for use in generating correlation peaks that provide the predetermined sequence with a robustness to speech frame errors;

generating a second predetermined sequence different from the first predetermined sequence;

sending the first predetermined sequence through the speech codec, wherein the first predetermined sequence is used to identify a first message type; and

sending the second predetermined sequence through the speech codec, wherein the second predetermined sequence is used to identify a second message type.

13. An apparatus comprising:

a first generator configured to generate a first predetermined sequence comprising a function of a pseudorandom noise sequence, where the first predetermined sequence has noise-like characteristics and wherein the first predetermined sequence comprises bit patterns for use in generating correlation peaks that provide the predetermined sequence with a robustness to speech frame errors;

a second generator configured to generate a second predetermined sequence different from the first predetermined sequence;

a speech codec configured to process the predetermined sequences to produce a speech packet,

wherein the first predetermined sequence is used to identify a first message type; and

wherein the second predetermined sequence is used to identify a second message type.

14. The apparatus of claim 13 wherein the predetermined sequences are further used for synchronizing non-speech frames through the speech codec.

15. The apparatus of claim 14 wherein the start of the non-speech frame boundaries is at least dependent on a distance from a time offset within the predetermined sequence to a reference time instance.

16. The apparatus of claim 15 wherein the reference time instance is a function of the speech codec frame boundary.

17. The apparatus of claim 13 wherein the function of a pseudorandom noise sequence is comprised of concatenating a plurality of pseudorandom noise sequences.

18. The apparatus of claim 13 wherein the function of a pseudorandom noise sequence is comprised of concatenating a plurality of pseudorandom noise sequences with a plurality of overlapped and combined pseudorandom noise sequences.

19. The apparatus of claim 18 wherein at least one of the pseudorandom noise sequences is inverted.

20. The apparatus of claim 13 wherein each sample of the predetermined sequence is separated by at least one sample of value binary 0.

21. The apparatus of claim 13 wherein the generators are further configured to generate a wakeup signal prior to the predetermined sequences to prohibit the speech codec from entering an inactive state.

22. The apparatus of claim 21 wherein the inactive state is a discontinuous transmission state.

23. The apparatus of claim 21 wherein the inactive state is the lowest transmission rate in a set of transmission rates.

24. An apparatus comprising:

means for generating a first predetermined sequence comprising a function of a pseudorandom noise sequence, where the first predetermined sequence has noise-like characteristics and wherein the first predetermined sequence comprises bit patterns for use in generating correlation peaks that provide the predetermined sequence with a robustness to speech frame errors;

means for generating a second predetermined sequence different from the first predetermined sequence;

means for sending the first predetermined sequence through the speech codec, wherein the first predetermined sequence is used to identify a first message type; and

means for sending the second predetermined sequence through the speech codec, wherein the second predetermined sequence is used to identify a second message type.

25. The apparatus of claim 24 wherein the predetermined sequences are further used for synchronizing non-speech frames through the speech codec.

26. The apparatus of claim 25 wherein the start of the non-speech frame boundaries is at least dependent on a distance from a time offset within the predetermined sequence to a reference time instance.

27. The apparatus of claim 26 wherein the reference time instance is a function of the speech codec frame boundary.

28. The apparatus of claim 24 wherein the function of a pseudorandom noise sequence is comprised of concatenating a plurality of pseudorandom noise sequences.

29. The apparatus of claim 24 wherein the function of a pseudorandom noise sequence is comprised of concatenating a plurality of pseudorandom noise sequences with a plurality of overlapped and combined pseudorandom noise sequences.

30. The apparatus of claim 29 wherein at least one of the pseudorandom noise sequences is inverted.

31. The apparatus of claim 24 wherein each sample of the predetermined sequence is separated by at least one sample of value binary 0.

32. The apparatus of claim 24 further comprising means for generating a wakeup signal prior to the predetermined sequence to prohibit the speech codec from entering an inactive state.

33. The apparatus of claim 32 wherein the inactive state is a discontinuous transmission state.

34. The apparatus of claim 32 wherein the inactive state is the lowest transmission rate in a set of transmission rates.