Abstract
A system is described which will convert an oscilloscope with z axis control into a sound spectrograph. For the frequency against time display, the oscilloscope provides the time base directly. The frequency range and the frequency-component amplitude information are supplied respectively to the y and z axes of the oscilloscope. The output of a digital-to-analogue converter (DAC) is applied to the vertical input of the oscilloscope. Each step of the DAC output is associated with a particular frequency range. Frequency amplitude information is extracted from the input signal with a set of bandpass filters. Multiplexed, these signals are used to express the amplitude of a particular frequency component along the z axis. The multiplexer and the DAC are driven by the same counting unit. Consequently, the stepping of the frequency range along the y axis and the switching of the amplitude information for the z axis are automatically kept in phase.
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