1. Digital Speech Level Analyser Gives you the information you need about Speech Performance

2. 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

3. DSLA Speech Quality Display MOS prediction Reference surface – transmitted signal Degraded surface – received signal Error surface

4. Wireless Network Hands-free PC DSLA Hands-free Handset port Ethernet Speech Quality Analysis for Handset to Handset Path (Same Location) Using One DSLA

5. Wireless Network Hands-free PC DSLA PSTN Analogue phone line Handset port Phone line port Speech Quality Analysis for PSTN to Handset Path (Same Location), Using One Digital Speech Level Analyser (DSLA)

6. Wireless Network DSLA PC Hands-free Handset port PC Hands-free Handset port Speech Quality Analysis for Handset to Handset Path (Different Locations), Using Two Digital Speech Level Analysers (DSLA)

7. PSTN Wireless Network DSLA PC 9-18 Vdc input for vehicle use Hands-free Phone line port Handset port Speech Quality Analysis for PSTN to Handset Path (Fixed & Mobile Locations), Using Two Digital Speech Level Analysers (DSLA)

8. Head & Torso Simulator (HATS) and Associated Components Handset Testing using Acoustic Test Components and Digital Speech Level Analyser (DSLA) Base Station Emulator Audio IN OUT Chamber

9. Handset Testing using B&K Acoustic Test Components and Digital Speech Level Analyser (DSLA) Chamber Artificial Mouth, 4227 Artificial Ear type 4185 or 4195 PC DSLA Handset under test Mic. Pre-amp., 2690 Power Amp., 2716 Base Station Emulator Audio OUT IN

10. Head & Torso Simulator (HATS) and Associated Components Handset Testing using Acoustic Test Components and Digital Speech Level Analyser (DSLA) Base Station Emulator Audio IN OUT Chamber or vehicle Hands-free kit

11. Head & Torso Simulator (HATS) and Associated Components Use of DSLA Equaliser to compensate for response of Artificial Mouth Base Station Emulator Audio IN 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

12. 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 Cellular Handset 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 Cellular Handset DSLA A: Handset with proprietary hands-free connector B: Handset with 2.5mm jack socket hands-free connector