Digital electronic recorder/player

The invention is a digital record/playback apparatus including an input digital filter, and A/D converter, a solid state memory, a D/A converter and an output digital filter. The entire system is driven off a single clock source which allows the frequent response of the filters to be modified simultaneous with the sampling frequency of the A/D and D/A converter. This allows the record/playback apparatus to record low frequency signals, such as medical data, as well as relatively high frequency signals such as voice, by simply changing the frequency of the clock source. In addition, the apparatus includes an expandable memory which allows recording of up to one hour or more of program material.