General Description
R&S
®
CMW-B400B/-B405A
11
User Manual 1176.8116.02 ─ 04
For speech quality analysis of a mobile phone, the audio signal must be generated and
analyzed by an external audio analyzer (e.g. R&S UPV) connected to the audio con-
nectors of the R&S
CMW.
The current software version supports only one speech codec, but the audio board
hardware is ready for two speech codecs. For future software releases, the full support
of two independently operating speech codecs is planned. A single speech codec pro-
vides a bidirectional interface (encoding and decoding) for a single controlling applica-
tion instance at a time.
The following sections describe typical test setups, the basic test procedure, the availa-
ble filters and the measurement results.
3.1 Test Setups
The following sections provide an overview of the audio connectors and of typical test
setups for the individual scenarios.
Test Setup for Audio Measurement and Generator
................................................ 12
Test Setup for Microphone- and Speaker Test
....................................................... 13
Test Setup for External Speech Analysis
................................................................14
3.1.1 Audio Connectors
An R&S
CMW with an installed audio board provides AF connectors for analog audio
signals at the front panel and SPDIF connectors for digital audio signals at the rear
panel.
AF connectors
Connector AF 1 IN and AF 2 IN are used for input of analog audio signals, AF 1 OUT
and AF 2 OUT for output of analog audio signals.
SPDIF connectors
Connector SPDIF IN is used for input of digital audio signals, SPDIF OUT for output of
digital audio signals. A digital signal can contain two multiplexed channels, SPDIF-L
and SPDIF-R.
Test Setups
深圳德标仪器
135-1095-0799
