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The authors describe the D2SP digital signal processor which is designed with a dual processor architecture, and is especially effective for stereo audio signal processing. The D2SP has two independent processor units, the left processor and right processor. The D2SP contains an audio data interface, external dynamic random-access memory (DRAM) interface, microcomputer interface, and a sequence controller. The single chip D2SP is capable of performing audio signal processing needed for graphic equalizers, surround, and sound power spectrum calculation. The dual processor mainly consists of a 24-bit multiplier with a 108-ns cycle time and is assembled on a single chip fabricated from 1.2- mu m CMOS technology. The total number of integrated transistors is approximately 300 K. Applications, such as use as a seven-band graphic equalizer, seven-band power spectrum calculator, and surround sound processing, are briefly discussed.