Recording on demand

Delayed recording with repeat playback functions of a recorder can be obtained by using multiplexers controlled by a logic network. A digital memory and analog-to-digital and digital-to-analog converters are used to get a few second delay. The delayed recording system is important for the construction of learning aid for students and selective recording of some long speech. The multiplexers and demultiplexers are used for the recording and playback functions of the recorder.