Abstract: An apparatus is disclosed for displaying two-channel audio input signals in a three-color visual pattern. In general, the visual pattern may be formed on a viewing screen by an apparently moving spot having three color components. Phase shifting means is employed to phase shift one of the two audio input signals, and both audio input signals are subsequently processed by low pass filters to produce positioning signals in X-Y coordinates for the spot which forms the visual pattern. In addition, the two audio input signals are also mixed and separately processed by a high pass filter, a band pass filter and a low pass filter to produce frequency separated signals for controlling the intensity of each of three color components of the spot forming the visual pattern. Automatic color balance means utilizing negative feedback is employed to control the amplitude of the separate frequency-discriminated audio signals.

Abstract: An apparatus is disclosed for displaying two-channel audio input signals in a three-color visual pattern. In general, the visual pattern may be formed on a viewing screen by an apparently moving spot having three color components. Phase shifting means is employed to phase shift one of the two audio input signals, and both audio input signals are subsequently processed by low pass filters to produce positioning signals in X-Y coordinates for the spot which forms the visual pattern. In addition, the two audio input signals are also mixed and separately processed by a high pass filter, a band pass filter and a low pass filter to produce frequency separated signals for controlling the intensity of each of three color components of the spot forming the visual pattern. Automatic color balance means utilizing negative feedback is employed to control the amplitude of the separate frequency-discriminated audio signals.