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Aural Monitoring of Waveforms

IP.com Disclosure Number: IPCOM000090383D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Maling, GC: AUTHOR

Abstract

The voltage versus time display that appears on an oscilloscope screen can be converted to an audio signal whose frequency varies with voltage. This is effected by converting the short sweep time on the oscilloscope to a period of a sinusoidal wave that is audible. Input waveform signal 10 is periodic and has an associated timing pulse 12. The latter is utilized to synchronize clock 14 that produces 2/n/ pulses per pulse 12. The output pulses from clock 14 drive commutator or stepping switch 16 2/n/ times between pulses 12. Signal 10 is fed to commutator 16 so that such signal is sampled 2/n/ times between each pulse 12. These samples are peak detected by peak detecting circuitry 18 and are used to drive a bank of voltage controlled oscillators VCO.

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Aural Monitoring of Waveforms

The voltage versus time display that appears on an oscilloscope screen can be converted to an audio signal whose frequency varies with voltage. This is effected by converting the short sweep time on the oscilloscope to a period of a sinusoidal wave that is audible. Input waveform signal 10 is periodic and has an associated timing pulse 12. The latter is utilized to synchronize clock 14 that produces 2/n/ pulses per pulse 12. The output pulses from clock 14 drive commutator or stepping switch 16 2/n/ times between pulses 12. Signal 10 is fed to commutator 16 so that such signal is sampled 2/n/ times between each pulse
12. These samples are peak detected by peak detecting circuitry 18 and are used to drive a bank of voltage controlled oscillators VCO. The output voltages of the VCO's are sampled at a slow, variable, rate by 64-channel multiplexer 20. The output from multiplexer 20 is amplified and is used to drive earphones 22. Thus the very short waveform is transformed into a long period audible version of the waveform having frequencies proportional to the sampled amplitude of the original waveform.

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