- Published in issue 12/1993 on page 36
Solid-state voice recorder
Integrated circuits ISDI012, ISDI016, and ISD I020 from chip maker ISD enable sounds to be recorded and played back. The final two digits in the type coding show the length of a sound message in seconds. The difference in recording and play back time is caused by the sampling frequency, which is hrghest (10.6 kHz) for the shortest time.