This paper describes the development of a digital audio mixer/equalizer for use in a professional digital audio mastering system with four input channels and two output channels. This mixer has a good operability as conventional analog audio mixers and has computer-controlled automatic functions. Digital signal processors (DSPs) are employed in the system to achieve digital signal equalization and level control which give it a good reliability as well as an excellent cost-performance ratio. The mixer can also be connected to a limiter/compressor and the AES/EBU digital interface. It allows a wide range of applications including the cutting of analog and compact discs, digital audio editing, and the mixing of digital and analog signals such as echo signals.
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