Audio equipment e.g. loudspeaker, testing method for car, involves comparing characteristic of measurement signal with reference signal so as to detect failure in audio equipment when characteristic of measurement signal is different

摘要

The method involves comparing a characteristic of a measurement signal with a reference signal so as to detect a failure in audio equipment such as loudspeaker (7), when the characteristic of the measurement signal is approximately different. The reference signal is calculated from a test signal i.e. sinusoidal signal, and a value of measurement of acoustic transfer between a microphone (8) and the loudspeaker. A value of amplitude of the reference signal is compared with amplitude of the measurement signal. An independent claim is also included for a system for testing an audio equipment.