Speech Audiometry Pure Tone Audiometer Schematic of Speech Audiometer Speech Audiometer Clinical or Diagnostic Audiometer two channels test booth input: pure tone or microphone or CD or phonograph or tape player or computer masking system talk-back system selector switch for input on each channel volume control (VC) and volume unit (VU) meter Clinical or Diagnostic Audiometer (Continued) amplifier attenuator output selector AC phones BC vibrator 2 loudspeakers talk back system patient signal device Testing Monitored live voice (MLV) Pre-recorded voice Attenuation: 12 dB steps (usually use 5 dB steps) 0110 dB range SDT and SAT Speech Recognition Threshold (SRT) CID W-1 (constant level) CID W-2 (attenuated) Spondiac words (spondees) Carrier phrase Watch cross hearingmasking PTA is about = to SRT Testing (continued) Most Comfortable Loudness (MCL) Connected discourse UCL, TD or LDL Range of Comfortable Loudness (RCL) vs. Dynamic Range Speech Discrimination Score (SDS) vs. Word Recognition Score (WRS) Recorded in percentage, not dB Phonetically Balanced (PB) words (50 monosyllabic) PB 50 or CID Auditory test W-22 PB Max = patients best discrimination score (25-40 dB SL) Word Intelligibility by Picture Identification test (WIPI) 90100% = normal 7690% = slight difficulty (i.e. telephone) 6076% = moderate problem 5060% = poor recognitiondifficulty interpreting speech < 50% = very poor recognition. Unable to understand speech