Video data change detector

The circuit detects a change in video information and uses this to switch on an alarm in a closed-circuit television guard system or a video recorder. The circuit is usable only where the same picture is shown on the TV monitor for some time. When the picture changes, the average brightness alters and this is[…]

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Solid State

Solid State Voice Recorder

Integrated circuits ISD 1012, ISD 1016 and ISD 1020 from chip maker ISD enable sounds to be recorded and played back. The final two digits in type coding show the length of a sound message in seconds. The difference in recording and playback is caused by the sampling frequency. which is highest (10.6 kHz) for[…]

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