Last updated: December 29, 2009
Voice SO mode determines the source of traffic data to be sent on the forward traffic channel (F-Traffic) (for IS-95 system) or the forward fundamental channel (F-FCH) (for IS-2000 system) to the mobile station (MS) when any of the voice service options (SO1, SO3, SO17, SO68, SO70 and SO32768) (see Service Option ) is active.
If the current service option is other than voice service options (SO1, SO3, SO17, SO68, SO70 and SO32768), the setting of the Voice SO mode will be stored and applied when a voice service option is active.
In echo mode the test set sends on the F-Traffic/F-FCH a copy of the frames it receives on the R-Traffic/R-FCH. This is referred to as "echo" mode since the sound captured by the mobile station's microphone are sent to the test set and then returned to the MS to be produced in the MS's speaker. The delay between the receipt of a frame on the R-FCH and its subsequent retransmission on the F-FCH can be set by the Echo Delay (see CALL[:CELL[1]]:TRAFfic[:FORWard]:SOURce:ECHO ). |
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This selection causes a vocoded 400 Hz tone to be sent on the F-Traffic/F-FCH to the MS. |
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This selection causes a vocoded 1 kHz tone to be sent on the F-Traffic/F-FCH to the MS. |
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This selection causes a vocoded repeatedly swept tone rising from 0 Hz to 3.0 kHz over 3 seconds to be sent on the F-Traffic/F-FCH to the MS. It is intended to be used for functional test and not as a portion of any audio quality tests. |
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This selection is used to generate multiple audio tones simultaneously. It is used in conjunction with the multi-tone audio measurement while operating in downlink audio mode. This causes downlink audio generator tones to be encoded and gets placed on the F-Traffic/F-FCH channels. See Downlink Audio Mode for details. |
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In real-time vocoder mode, the test set real-timely encodes the analog audio signal applied at the test set's AUDIO IN connector using the appropriate vocoder algorithm (depending upon the selected voice service option) and then sends the encoded audio frames to the mobile station on the F-Traffic/F-FCH. Also, the test set can simultaneously decodes the encoded audio frames that is received on the R-Traffic/R-FCH using the appropriate vocoder algorithm (depending upon the selected voice service option) and then converts to an analog signal output at the test set's AUDIO OUT connector. See Real-Time Vocoder for details. |
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This selection is used to generate the speech signal which complies with the ITU-T P.862 standard and is used by the Perceptual Evaluation of Speech Quality (PESQ) measurement to test the voice quality of the mobile phone. See Perceptual Evaluation of Speech Quality (PESQ) Measurement Description for details. |
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This selection causes minimal energy frames to be sent on the F-Traffic/F-FCH. It is intended to be used with the multi-tone audio measurement while operating in uplink audio mode. See Uplink Audio Mode for details. |
Multi-Tone
or
Null Frame
. This is because many of the DSP resources are consumed for producing the audio signal and running the vocoder so there are not enough left to perform other measurements.
Real-Time Vocoder
, all of the measurements and instruments except for the Frame Error Rate measurement, Audio Generator and Data throughput Monitor, are unavailable. This is because many of the DSP resources are consumed to meet the real-time requirements for vocoder frame delivery or analog audio generation.
GPIB Command:
CALL[:CELL[1]]:TRAFfic[:FORWard]:SOURce
(for IS-95 system)
CALL[:CELL[1]]:FCHannel[:FORWard]:SOURce
(for IS-2000 system)
Manual Operation: How Do I Change F-FCH/Traffic Channel Parameters?