Download - Digital Speech Level Analyser Gives you the information you need about Speech Performance
Digital Speech Level Analyser
Gives you the information you need aboutSpeech Performance
• Purpose-designed (not based on a PC sound card)
• 24-bit A-D and D-A conversion technology
• Noise floor lower than -80dBm for balanced input
• Dynamic range greater than 110dB for balanced input (noise floor to clipping)
• The best quality platform available
DSLA: A Precision Instrument
DSLA Speech Quality Display
MOS prediction
Reference surface – transmitted signal
Degraded surface – received signal
Error surface
WirelessNetwork
Hands-free
PC
DSLA
Hands-free
Handset port
Ethernet
Speech Quality Analysis for Handset to Handset Path (Same
Location) Using One DSLA
WirelessNetwork
Hands-free
PC
DSLA
PSTN
Analogue phone line
Handset portPhone line port
Speech Quality Analysis forPSTN to Handset Path
(Same Location), Using One Digital Speech Level
Analyser (DSLA)
WirelessNetwork
DSLA
DSLA
PC
Hands-free
Handset port
PC
Hands-free
Handset port
Speech Quality Analysis forHandset to Handset Path
(Different Locations), Using Two Digital Speech Level
Analysers (DSLA)
PSTNWirelessNetwork
DSLA
DSLA PC
PC
9-18 Vdc input for vehicle use
Hands-free
Phone line port
Handset port Speech Quality Analysis forPSTN to Handset Path
(Fixed & Mobile Locations), Using Two Digital Speech Level
Analysers (DSLA)
Head & Torso Simulator (HATS) and
Associated Components
Handset Testing using Acoustic Test Components and Digital Speech
Level Analyser (DSLA)
Base
Station Emulator
AudioIN OUT
Chamber
Handset Testing using B&K Acoustic Test Components and Digital Speech Level Analyser
(DSLA)
Chamber
Artificial Mouth, 4227
Artificial Eartype 4185 or
4195
PC
DSLA
Handset under test
Mic. Pre-amp.,2690
Power Amp.,2716
Base
Station Emulator
AudioOUT IN
Head & Torso Simulator (HATS) and
Associated Components
Handset Testing using Acoustic Test Components and Digital Speech
Level Analyser (DSLA)
Base
Station Emulator
AudioIN OUT
Chamber or vehicle
Hands-free kit
Head & Torso Simulator (HATS) and
Associated Components Use of DSLA Equaliser to compensate for response of
Artificial Mouth
Base Station
Emulator
AudioIN OUT
Acoustic Chamber
Equalised reference signal
(artificial mouth
complement)
Equalised file
Wide-band reference signal
on PC
1
3
2
4 Degraded file
5 Degraded file, for comparison with wide-band
reference
Connecting Cellular Handset
to Digital Speech Level
Analyser (DSLA)
Lead, 3.5mm plug to 3.5mm plug
Lead, RJ-22 plug to 3.5mm socket
Adaptor, 2.5mm plug to 3.5mm socket
Specific adaptor, providing 2.5mm jack socket for headset
CellularHandset
DSLA
Lead, 3.5mm plug to 3.5mm plug
Lead, RJ-22 plug to 3.5mm socket
Adaptor, 2.5mm plug to 3.5mm socket
CellularHandset
DSLA
A: Handset with proprietary hands-free connector
B: Handset with 2.5mm jack socket hands-free connector