FONIX® 8000 - Frye Electronics

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226 FONIX 8000 Hearing Aid Test System hArMONICS Integral multiples of a pure tone. The tone itself is the 1st harmonic, or fundamental frequency; twice the frequency of the tone is the 2nd harmonic; three times the frequency of the tone is the 3rd harmonic; etc. hArMONIC The presence of harmonics in a reproduced signal that are not present in DISTOrTION the original signal. hFA High frequency average: according ANSI S3.22-1987, the averaged response at 1000, 1600 and 2500 Hz. hEAD BAFFLE Refers to the comparative augmentation of high-frequency sound EFFECT caused by the acoustic diffraction of low-frequency sound by the head and pinna blending to produce a baffle. hL Hearing Level. The amount of decibels above audiometric zero at which a measured ear barely hears a sound. hz Hertz. Unit of frequency, referring to cycles per second. ICrA International Collegium of Rehabilitative Audiology. IEC International Electrotechnical Commission. An international organization that sets standards for measurements. IN-SITU Latin for “in position.” In audiometry, it designates measurements taken with the hearing aid “in place” in the ear. INTEr- Distortion generated by the faulty mixture of different input frequencies. MODULATION This is a primary cause of harshness and lack of intelligibility in a DISTOrTION hearing aid. JIS Japanese Industrial Standard. The organization which sets standards for measurements in Japan. KEMAr Knowles Electronics Manikin for Acoustic Research. A model, which nearly reproduces the acoustic qualities of an average adult head and torso, that is utilized in the assessment of hearing aid performance. LED Light Emitting Diode. A small light on an instrument panel. LEVELING An automatic calibration procedure, establishing a “zero line” for measurements, taking into account all the acoustic properties of the test chamber or the testing room. MENU A list of choices offered by a computer software program. MULTI-CrOS A hearing aid system that has a switch to select either a CROS, a BI-CROS, or a Monaural arrangement. MZ COUPLErS Modified Zwislocki Couplers. Three couplers based on the Zwislocki design, but sturdier; provided with the OES option.
Glossary of Terms for the FONIX 8000 227 NAL National Acoustic Laboratories of Australia. NBS National Bureau of Standards (U.S.), now known as National Institute of Standards and Technology. NOISE The 8000’s method of producing a more stable reading by averaging rEDUCTION many samples. OCCLUSION Low-frequency intensification in the loudness level of bone-conducted EFFECT signals resulting from the blocking of the ear canal. OES Occluded Ear Simulator. An option on the 8000, using three special couplers, that provides the same data obtained with a standard ear simulator. POGO Prescription Of Gain and Output. A hearing aid prescription formula. POWEr The output of an aid, in dB SPL. PT BUrST A burst of ten pure tones corresponding to standard audometric frequencies. The entire signal lasts for less than two seconds. PUrE TONE A testing tone consisting of only one frequency. rEAL-TIME The ability to view instantly the results of hearing aid tests. TESTING rEFErENCE The location in a test chamber where the microphone of a hearing aid POINT must be placed for accurate testing. In the 8000, it is the small circle in the center of the test chamber. rESONANCE The tendency of an acoustic system to reinforce sounds of a certain frequency, the frequency determined by the shapes and sizes of the components of the system. rESPONSE LIMIT The high and low points of the frequency range found in the ANSI test sequence conditions. rMS Root Mean Square. An overall measurement of the signal going in or coming out of a hearing aid. When measuring with Pure tones, the RMS level at each individual frequency will be the same as the level shown at each frequency on a response curve. When measuring with a Composite Tone, the (overall) RMS level will be several dB higher than the level at each frequency on a response curve, since all the frequencies are presented at once. SATUrATION The condition where any further increase in input level will yield no further increase in output level. SMOOThING A “rounding-off” of a curve, removing minor peaks and valleys, to create a more readable curve, using a method that is equivalent to warbling the input signal.
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Chapter 7 145 The ISTS Test The IST
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The ISTS Test 147 No HL 250 Hz 375
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Page 207 and 208: Appendix A 199 Specifications ACOUS
Page 209: Specifications 201 Size: 11.5"W x 1
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Page 219: Calibration 211 6. Thread the probe
Page 231 and 232: Appendix G 223 Glossary of Terms AG
Page 233: Glossary of Terms for the FONIX 800
Page 237: Appendix H 229 The FONIX Keyboard A
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FONIX® 8000 - Frye Electronics

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