RTGRAM is a free program for displaying a real-time scrolling spectrographic display of an audio signal. With RTGRAM you can monitor the spectro-temporal characteristics of sounds being played into the computer's microphone or line input ports. RTGRAM is optimised for speech signals and has options for different sampling rates, analysis bandwidths, temporal resolution and colour maps.
Uses your PC sound card to create audio frequencies in the range 100 to 15000 Hz
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