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0611 RM500SL User’s Guide Version 2.8 Page 70
17 Speechmap ®
17.1 Section overview
FastFacts 17.1: Speechmap
17.2 Speechmap facts
FastFacts 17.2: Speechmap facts
Speechmap
is a trademarked hearing instrument fitting environment introduced
by Audioscan in 1992. It presents hearing threshold, UCL and amplified speech
spectra as SPL in the ear canal. The fitting goal is to make amplified speech
audible and comfortable while avoiding discomfort for loud sounds. Originally
speech was simulated using amplitude-modulated tonal signals. The RM500SL
replaces these simulated speech signals with real speech, both recorded and live.
For details of the test signals and analysis methods, see 19: Speechmap
Technical Details.
Speechmap departs from insertion gain target methods in presenting amplification
goals in the context of the residual auditory area, not as an isolated target line,
and in the use of real speech, not tones or broad-band noise. This is extremely
important for non-linear hearing aids, analog or digital, because their processing is
signal-dependent. It also makes provision to correct audiometric data and 2cc
coupler measurements for age-related or individually-measured acoustic
differences between real ears and the couplers used for calibration and testing.
The Speechmap environment provides two hearing instrument verification options:
REM (real-ear measurement) and S-REM (simulated REM). See 17.9: REM or
S-REM mode for details.
Speechmap
presents hearing threshold, UCL and amplified speech spectra as
SPL in the ear canal. The fitting goal is to make amplified speech audible and
comfortable while avoiding discomfort for loud sounds. Speechmap is normally
used in SPL and this guide describes only this usage. See 11.4: SPL or HL scale.
This section covers the following topics:
17.2: Speechmap facts 17.7: Screen tour – unaided screen
17.3: DSL 5.0 in Speechmap 17.8: Screen tour - aided screen
17.4:DSL 5.0 changes 17.9: REM or S-REM mode
17.5: NAL-NL1 in Speechmap 17.10: SII calculation in Speechmap
17.6: Using Speechmap
Related sections are 18: Speechmap Fitting Procedures and 19: Speechmap
Technical Details