Uploaded July 2018 | Updated September 2026, 3 weeks ago
This video demonstrates a experimental audio filter effect. The Lite2Sound PX photodiode amplifier kit v.1.4 from rarewaves.net is used. The CRT is a Tektronix 603 X-Y monitor. Connect an audio sawtooth oscillator to the X input. Connect the Lite2Sound output to the Y input, and also to the speakers. Point the photodiode at the CRT. Objects that block the photodiode's view of the CRT are transformed into audio waveforms. The silhouette of the obstruction becomes impressed into the audio waveform and you can morph it in real time by moving your hand. The sound is like a combination of PWM and notch / bandpass filter. And at the end of the video, the original "comb filter" effect is demonstrated!
This video demonstrates a experimental audio filter effect. The Lite2Sound PX photodiode amplifier kit v.1.4 from rarewaves.net is used. The CRT is a Tektronix 603 X-Y monitor. Connect an audio sawtooth oscillator to the X input. Connect the Lite2Sound output to the Y input, and also to the speakers. Point the photodiode at the CRT. Objects that block the photodiode's view of the CRT are transformed into audio waveforms. The silhouette of the obstruction becomes impressed into the audio waveform and you can morph it in real time by moving your hand. The sound is like a combination of PWM and notch / bandpass filter. And at the end of the video, the original "comb filter" effect is demonstrated!
