Equalization of speech signal in a mobile phone

摘要

The invention relates to equalization in a digital phone, advantageously a mobile phone. According to the invention, the equalization (4) of a reproduced sound is changed according to the operating conditions of the phone. Information about the conditions is obtained by monitoring the sound volume (19) set by the user, measuring the background noise (17) in the operating environment of the phone through the phone's microphone (9) and/or monitoring the quality (16) of the connection between the phone and the communication network. The low frequency emphasis is reduced in a very noisy environment and increased in a quiet environment. The telephone according to the invention is advantageously a mobile phone in a digital cellular network. <IMAGE>