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 as 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 make it highly reliable as well as providing 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 cutting analog and compact discs, digital audio editing, and mixing digital and analog signals such as echo signals.
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