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1. WO2000011893 - METHOD AND APPARATUS FOR CONTROL OF VOCODER BYPASS UTILIZING INBAND SIGNALING

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

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.

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. 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.

8. 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.