Telephone set, especially a mobile telephone, has an integral sound generator programmed or programmable to generate background noise such as found in railway stations, airports, etc.

摘要

The device has an integral sound generator (60) for generating sounds such as telephone bells and programmed or programmable to generate background noise such as found in railway stations, airports, restaurants and so on. The device can be switched (70) to a mode in which the background noise is added (20) to the voice signal.