Agilent Technologies E6474A Manual de Serviço descarregar pdf (Página 47)

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Appendix A- Calibration of USB Audio

Module

Measurement may normally be performed at the

recommended settings for the ASIO USB control application,

refer to “Setting up the USB Audio Module” on page 26.

However, attenuation or boosting of voice amplitude may

occur along the communication network (which includes the

mobile handset), such that undesirable low SNR

(signal- to- noise- ratio) or clipping occurs. Hence, it may be

necessary to adjust the gain setting for downlink (ear gain)

or uplink (month gain). Use the ASIO USB Control

application to set the levels.

1 To verify if calibration is necessary, start the

measurement and let it run for about 3 minutes before

terminating measurement (may also setup the system to

run 2 iterations).

2 Start the VQT application.

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Agilent Technologies E6474A Manual de Serviço Página 47