Method and apparatus for control of vocoder bypass utilizing inband signaling

• US 6,070,089 A
• Filed: 01/12/1999
• Issued: 05/30/2000
• Est. Priority Date: 08/21/1998
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Martinovich, Krsman, Ashley, James Patrick, Proctor, Lee Michael, Brophy, John Douglas
• Primary Examiner(s): TO, DORIS HA
• Application Number:
  US09/229,230
• Time in Patent Office: 504 Days
• Field of Search: 455/560, 455/403, 455/445, 455/422, 455/501, 455/507, 455/517, 455/524, 455/550, 379/229, 379/219, 379/350, 379/353, 379/407, 370/287, 370/374, 370/378, 370/384-385, 370/522, 375/219, 375/242-243, 375/254, 375/277, 704/221, 704/214, 704/233
• US Class Current: 455/560
• CPC Class Codes: H04W 88/181 Transcoding devices; Rate adaptation devices

Abstract

Vocoder bypass is provided using a combination of out-of-band and in-band signaling. In preferred embodiments of the present invention, two signaling channels are arranged for transmission within the compressed speech. Each of the signaling channels are communicated at a preferred rate to permit fast, reliable detection of conditions indicating vocoder bypass mode of operation and to synchronize and communicate compressed speech in a vocoder bypass mode of operation.

Claims

1. In a wireless communication system providing communication services between a first mobile and a second mobile, the first mobile having a first mobile vocoder, the second mobile having a second mobile vocoder and the wireless communication system having a vocoder active mode of operation and a vocoder bypass mode of operation, a method of transitioning the wireless communication system from vocoder active mode of operation to the vocoder bypass mode of operation, the method comprising the steps of:

providing a vocoder bypass portion within a compressed speech signal, the vocoder bypass portion capable of including a first signal and an encoded speech signal, the first signal including a vocoder bypass capability information and a vocoder type information, the encoded speech signal including the vocoder type information;

detecting the vocoder bypass portion within the compressed speech signal;

determining a compatibility of the first mobile vocoder and the second mobile vocoder based at least upon the vocoder type information; and

initiating the vocoder bypass mode of operation based upon the compatibility;

wherein the positioning of at least one of the first signal and the encoded speech signal within the compressed speech signal is dependent upon at least a user-controlled signal.

2. The method of claim 1, further comprising the step of ceasing provision of the first signal within the compressed speech signal.

3. The method of claim 2, wherein the step of ceasing provision of the first signal within the compressed speech signal comprises the step of ceasing provision of the first signal within the compressed speech signal upon the expiration of a timer.

4. The method of claim 2, wherein the step of ceasing provision of the first signal within the compressed speech signal comprises the step of ceasing provision of the first signal within the compressed speech signal upon determining that the vocoder bypass mode of operation has been initiated.

5. The method of claim 1, the first signal including synchronization information.

6. The method of claim 1, the encoded speech signal including synchronization information.

7. The method of claim 1, the vocoder bypass mode of operation further comprising providing encoded speech information within the compressed speech channel and at a subrate thereof.

8. The method of claim 1, wherein the vocoder type information comprises a first mobile vocoder type and a second mobile vocoder type, and the step of determining a compatibility comprises comparing the first mobile vocoder type with the second mobile vocoder type.

9. The method of claim 1, further comprising the step of providing the first signal within the compressed speech signal upon detection of an enable out-of-band signaling directive.

10. The method of claim 1, further comprising the step of providing the encoded speech signal within the compressed speech signal upon detection of an enable out-of-band signaling directive.

11. The method of claim 1, further comprising the step of ceasing provision of the first signal within the compressed speech signal upon detection of a disable out-of-band signaling directive.

12. The method of claim 1, further comprising the step of ceasing provision of the encoded speech signal within the compressed speech signal upon detection of a disable out-of-band signaling directive.

13. In a wireless communication system, an apparatus for providing inband vocoder control comprising:

an inband signal channel generator providing a bypass signal;

a multiplexer coupling the bypass signal into an uplink portion of a speech channel;

a bypass signal detector coupled to the speech channel and providing a detection signal upon detecting the bypass signal or encoded speech within a downlink portion of the speech channel;

a vocoder type detector responsive to the detection signal to provide a vocoder type signal;

a multiplexer, responsive to the vocoder type signal, to couple encoded speech into the uplink portion of the speech channel; and

a splicer to couple the encoded speech into a downlink portion of the speech channel.

14. The apparatus of claim 13, wherein the bypass signal comprises at least one of synchronization information and vocoder type information.

15. The apparatus of claim 13, comprising:

a demultiplexer coupled to the downlink portion of the speech channel and arranged to separate a bypass signal portion and an encoded speech signal portion;

a bypass signal receiver coupled to the demultiplexer to receive the bypass signal portion and to generate a bypass signal statistic;

an encoded speech signal receiver coupled to the demultiplexer to receive the encoded speech signal portion and to generate an encoded speech signal statistic; and

the splicer responsive to the encoded speech signal statistic to couple the encoded speech into the downlink portion of the speech channel.

16. In a wireless communication system, the wireless communication system having a vocoder mode of operation and a vocoder bypass mode of operation, a method for inband signaling control of the vocoder bypass mode of operation, the method comprising the steps of:

in the vocoder active mode of operation;

receiving a coded first signal from a mobile, decoding the coded first signal to create a decoded first signal and coupling the decoded first signal into a speech channel in a first direction;

receiving a decoded second signal in the speech channel in a second direction, coding the decoded second signal and transmitting the coded second signal to the mobile;

generating a first bypass signal and embedding the first bypass signal into the speech channel in the first direction and generating a second bypass signal and embedding the second bypass signal into the speech channel in the second direction;

upon detecting either the first bypass signal or the second bypass signal in the speech channel, determining a vocoder compatibility; and

upon determining the vocoder compatibility entering the second mode of operation;

in the second mode of operation;

receiving the coded first signal from the mobile and coupling the coded first signal into the speech channel in the first direction; and

receiving a coded second signal in the speech channel in the second direction and transmitting the coded second signal to the mobile.

17. The method of claim 16, the first bypass signal containing first vocoder type information, the second bypass signal containing second vocoder type information, and the step of determining a vocoder compatibility comprising comparing the first vocoder type information and the second vocoder type information.

18. The method of claim 16, further comprising in the second mode of operation the steps of providing a first vocoder type information signal in the speech channel in the first direction and providing a second vocoder type information signal in the speech channel in the second direction, and the step of determining a vocoder compatibility comprising comparing the first vocoder type information and the second vocoder type information.

19. The method of claim 16, wherein each of the first bypass signal and the second bypass signal contain synchronization information.

20. The method of claim 16, further comprising concomitantly generating the first bypass signal and embedding the first bypass signal into the speech channel in the first direction and generating the second bypass signal and embedding the second bypass signal into the speech channel in the second direction.

21. The method of claim 16, further comprising concomitantly generating the coded first signal and embedding the coded first signal into the speech channel in the first direction and generating the coded second signal and embedding the coded second signal into the speech channel in the second direction.