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FM Accessory to IBM Executary Unit

IP.com Disclosure Number: IPCOM000095681D
Original Publication Date: 1964-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Wortzman, D: AUTHOR

Abstract

The system converts an analog signal into square wave pulses, the frequency of which is inversely proportional to the amplitude of the analog signal. This system also recreates the analog signal from such square wave pulses previously recorded on some storage media, such as a magnetic belt or tape. To modulate the input signal, switches 1, 2 and 3 are in their up position as shown by the solid lines. The input signal voltage level is compared with the ramp signal voltage from ramp generator 4 at comparator 11.

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FM Accessory to IBM Executary Unit

The system converts an analog signal into square wave pulses, the frequency of which is inversely proportional to the amplitude of the analog signal. This system also recreates the analog signal from such square wave pulses previously recorded on some storage media, such as a magnetic belt or tape. To modulate the input signal, switches 1, 2 and 3 are in their up position as shown by the solid lines. The input signal voltage level is compared with the ramp signal voltage from ramp generator 4 at comparator 11.

When the ramp signal voltage exceeds the input signal voltage, trigger 5 is flipped to its opposite state. Trigger 5 has two outputs. One is on lead 7 and is fed back to generator 4 and resets it each time the trigger changes to its opposite state. The other output on lead 8 goes to some suitable recording media. With this arrangement the greater the voltage level of the input signal, the less frequently the trigger changes state. Accordingly, the output is at a lower frequency.

To reproduce the original analog signal from such a recorded signal, the switches are moved to their lower position, shown by the dotted. lines. The square wave pulses at the input are fed to trigger 5 causing it to change status every time a pulse is applied. The output of trigger 5 on lead 7 resets generator 4 each time it changes status. The output of generator 4 is amplified by amplifier 9 having a gain of 2. 0 and then integrated by the filter...