Telephony equipment comprising a keyboard with sound generating keys

摘要

The present invention relates to a telephone apparatus comprising a keyboard having keys for preventing any electrical connection to the associated circuit. Providing a source frequency generator (23) there is includes a mechanical device capable of vibrating at a particular frequency under the respective keys. Sub-set 25 guarantees After detecting these frequencies, and determine the location of their sources and converted to electrical signals, the signals thus processed data corresponding to the particular key pressed.