A digital sound generator can be built with some simple equations below. They are suitable for beeing used in a 8-bit microcontroller unit with assembler. lt produces a cosinus sine wave with 10% even and odd harmonics. It also can be transformed into a digital circuit.

 This circuit uses an adder a multiplier and a substractor. It was tested in a Lattice PLD together with a programmable EEPROM for the multiplication. It can easily be changed to e.g. Verilog language or also VHDL (VLSI Hardware Description Language).

Conclusion and Summary

 Simple equations can be used to produce sound in microprocessor applications and programmable logical devices.