| 摘要 |
The device has a key (1) for the serial introduction of the coded signal. It comprises electronic circuits for the storage of the code and for the utilization of the signal. At the beginning or at the end of each operation of the key, a signal is generated. The time interval between those signals is identified as "long", "medium" and "short". The sequence of those intervals between the signal, that is to say the poses, is compared with the stored code. Such a code may be readily formed by the rythm of a song or a melody and may thus by easily individualized. The introduction of the code, particularly the decoding, is performed in a "blind" manner, that is to say without feedback signals. The different functions may be executed by separate components (fig. 1) or by a micro-computer (23). |
