Introduction - Remote Control Audio Generator and Analyzer

Audio measurements form a separate function group (Non Signalling mode) with associated secondary address. The Signalling mode is not available for audio measurements. However, it is possible to perform audio measurements while using the signalling modes from other function groups (e.g. establish a call to a mobile in function group GSM900-MS Signalling and switch over to perform additional audio measurements). Consequently, additional audio-related commands may be provided in other contexts (for example, see the ROUTe:SPENcoder... and ROUTe:SPDecoder... commands in the GSM-MS and other function groups).

The audio function group provides two independent measurements:

• In a single-tone audio measurement, the CMU generates an audio signal at constant level and frequency (see section Measurement Menu Analyzer/Generator) and analyzes a single-tone audio input signal.
• In a multitone measurement (see section Measurement Menu Audio Multitone , the CMU generates a composite audio signal consisting of up to 20 distinct test tones and analyzes an audio input signal containing the same tones.

Note:
The single-tone generator and the multitone audio measurement must not be running simultaneously. In manual control, this is ensured because the single-tone audio generator is automatically switched off upon swichover to the Multitone menu and vice versa. In remote control, the conflict must be resolved explicitly:
The single tone AF generator must be switched off before a multitone measurement is started.
A running multitone measurement must be aborted before the single tone AF generator is switched on.
In the case of two conflicting audio measurements, the READ..., FETCh..., SAMPle... commands will result in an error message.

Two independent audio circuits are provided for both single tone and multitone measurements:

• In the primary audio circuit (subsystems AFANalyzer[:PRIMary] and AFGenerator[:PRIMary] for single tone measurements, MULTitone:AF1Channel for multitone measurements), the audio signals are applied to the connectors AF OUT (output, AF generator signal) and AF IN (input) on the CMU front panel. The [:PRIMary] single tone audio circuit corresponds to the Audio Analyzer/Generator menu and the associated configuration menu. The MULTitone:AF1Channel audio circuit corresponds to the AF Chan. One multitone application.
• In the secondary audio circuit (subsystems AFANalyzer:SECondary and AFGenerator:SECondary for single tone measurements, MULTitone:AF2Channel for multitone measurements), the audio signals are applied to the connectors AUX 2 (output, AF generator signal) and AUX 1 (input) on the CMU front panel. The :SECondary single tone audio circuit can not be controlled manually. The MULTitone:AF2Channel audio circuit corresponds to the AF Chan. Two multitone application.

With the exception of the input and output connectors, the two audio circuits are identical. Configurations such as the input path (AFLevel) can be set independently. All remote control commands are analogous.

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Subsystem Options