GB/T 25102.2-2010
Electroacoustics.Hearing aids.Part 2:Hearing aids with automatic gain control circuits (English Version)

Standard No.

GB/T 25102.2-2010

Language

Chinese, Available in English version

Release Date

2010

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 25102.2-2010

Replace

GB/T 6659-1986

Scope

This part specifies the dynamic operating characteristics and steady-state operating characteristics of hearing aids with automatic gain control and their measurement methods. This part only stipulates various characteristics and related measurement methods, and does not specify various performance indicators. This section applies to all types of hearing aids with automatic gain control circuits. This standard includes devices having a compression or limiting function on the envelope of the input signal, and also includes devices with long-term average output control. a) The automatic gain control circuit is used to compress or reduce the dynamic range of the output sound pressure to maintain the integrity of the output signal. b) An automatic gain control circuit is usually used instead of a peak clipping device for limiting. When the input signal is large, the input/output characteristics tend to be flat. The main function of the limiting device is to prevent the excessive sound output by the hearing aid from entering the listener's ear. This section does not include: a) Extenders. b) Limiting device. The limiter is different from the automatic gain control circuit, the limiter cuts off the signal peak above a certain level. The automatic gain control circuit can keep the input signal waveform unchanged in steady state.

GB/T 25102.2-2010 Referenced Document

• GB/T 25102.1-2010 Electroacoustics.Hearing aids.Part 1:Hearing aids with induction pick-up coil input
• GB/T 25102.100-2010 Electroacoustics.Hearing aids.Part 0:Measurement of electroacoustical characteristics
• GB/T 3241-1998 Octave-band and fractional-octave-band filters
• GB/T 3769-1983 Scales and sizes for plotting frequency characteristic and polar diagrams
• IEC 60118-6:1999 Hearing aids - Part 6: Characteristics of electrical input circuits for hearing aids
• IEC 60268-8:1973 Sound system equipment. Part 8 : Automatic gain control devices
• IEC 60711:1981 Occluded-ear simulator for the measurement of earphones coupled to the ear by ear inserts

GB/T 25102.2-2010 history

• 2010 GB/T 25102.2-2010 Electroacoustics.Hearing aids.Part 2:Hearing aids with automatic gain control circuits
• 1986 GB/T 6659-1986 Measurement of electroacoustical characteristics of hearing aids with automatic gain control circuits

GB/T 25102.2-2010 Electroacoustics.Hearing aids.Part 2:Hearing aids with automatic gain control circuits has been changed from GB/T 6659-1986 Measurement of electroacoustical characteristics of hearing aids with automatic gain control circuits.

GB/T 25102.2-2010 -All Parts