Light emitting diode dot matrix display system with audio output

A light emitting diode dot matrix display system for simultaneously displaying a visual signal and transmitting an audio signal, comprising:

• a dot matrix display panel having a row and a column of light emitting diodes;
• an interface circuit connected to said dot matrix display panel, said interface circuit including a driver circuit for said light emitting diodes of said display panel;
• a visual signal display controller connected to said interface circuit for controlling display of said visual signal on said display panel;
• an audio signal transmitter connected to said interface circuit for providing a modulated audio signal to said light emitting diodes;
• and
• a receiver for receiving light emitted from said light emitting diodes and retrieving said audio signal therefrom;
• wherein said visual signal display controller comprises an executive program executed on a computer;
• wherein said interface circuit comprises:
• a system control block connected to a parallel port of said computer for providing a timing control and maintaining a count of pulses of said modulated audio signal;
• an address generator connected to said system control block for transforming frequency of said modulated audio signal to a scanning frequency for use in said row of light emitting diodes;
• a random access memory connected to said address generator for containing design information of said visual signal to be displayed on,the LED display panel;
• a PC data buffer connected to said parallel port of said computer;
• a column signal buffer connected between said address generator and said dot matrix display panel;
• and
• a row signal buffer connected between said random access memory and said dot matrix display panel.