How Do I Use Real-Time Vocoder?

General Procedure

1. Press the blue SHIFT key and then the green Preset key to fully reset the test set.
2. Follow the procedure described in How Do I Set Up a Call? to establish a voice call. (In this example, System Type is IS-2000 , Operating Mode is Active Cell and Service Option is SO17 ).
   
3. Press the More key on the lower right side of the display until Call Parms 3 of 4 is displayed.
4. Set the Voice SO Mode ( F11 ) to Real-Time Vocoder .
   
5. Press the More key on the lower left side of the display until Call Control 3 of 3 (in Test Application) or Call Control 3 of 5 (in Lab Application) is displayed.
6. Select Real-Time Vocoder ( F1 ).
7. Select Real-Time Vocoder Parms ( F1 ). The Real-Time Vocoder Parameters menu is displayed. Set the parameters as desired and then press the Close Menu ( F6 ) key when finish the setting.
   
8. Speak into the mobile station. Verify that the voice is heard from the loudspeaker. The voice encoded by the mobile station is sent to the test set over the RF link. The test set then demodulates, decodes the signal and converts it to an analog signal output to the AUDIO OUT connector. The signal is then played by the loudspeaker.
9. Speak over the microphone. Verify that the voice is heard from the mobile station's speaker. The analog voice signal inputs to the test set over the Audio In connector. The test set samples, encodes the signal, and modulates it onto the RF link. The mobile station when receiving the RF signal, then demodulates, decodes, and converts the signal into an analog audio output to its speaker.
10. A typical display during real-time vocoder operation is shown below. For an explanation of the encoder headroom and decoder headroom results, see Real-Time Vocoder Headroom Information .
    

Related Topics

Real-Time Vocoder

CALL:RTVocoder