Table of Contents
Chapter 1: Overview ............................................................1
1.0 Power on procedure for the Colt Audiometer ...........................................1
1.1 A Description of the Colt audiometer system ............................................3
1.2 The Tablet Operator Interface ...........................................................4
1.3 Microphone channels ...................................................................4
1.4 Digital Operation for Reliability .........................................................4
1.5 Control Simplicity ......................................................................4
1.6 Audio Power ............................................................................5
1.7 Blue Tooth Connectivity allows Operator Freedom ......................................5
1.8 Portability and Data Storage.............................................................6
1.9 RF Shielding.............................................................................6
Chapter 2: Specifications ........................................................7
2.1 General Characteristics..................................................................7
2.2 Pure Tone Signals .......................................................................7
2.3 Attenuators .............................................................................8
2.4 Signal Format............................................................................8
2.5 Channel Inputs..........................................................................8
2.6 VU Meters...............................................................................9
2.7 Channel Outputs ........................................................................9
2.8 Sound Field Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.9 Built in Speech Testing ..................................................................9
2.10 Regulatory .............................................................................9
Chapter 3: Specification Test Procedure.........................................11
3.1 Pure Tone Audiometric screen .........................................................11
3.1.1 Testing against a “normal” hearing threshold. ....................................11
3.1.2 A table of audiometric calibration values .........................................11
3.1.3 Reference to ANSI S3.6-2010 and IEC 60645-1 .....................................11
3.2 Speech Audiometric Screen ...........................................................11
3.2.1 Check of Speech Sound Levels ....................................................11
Chapter 4: Circuit Description.................................................. 13
4.1 Introduction............................................................................13
4.2 Block Diagram and Circuit Diagrams....................................................14
4.2.1 Circuit diagram sheets.............................................................14
4.3. CPU and associated circuits ...........................................................15
4.4. DSP Circuits............................................................................16
4.5. Analog input signals ...................................................................17
4.6. Speaker Power Output amplifiers......................................................18
4.7. Monitor Amplifier......................................................................18
