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Audio Mix Modules

The audio mix modules are the core of the mixer unit. Each module shall contain four eight-to-two attenuating mixer chips. These mixers shall digitally controlled, and shall provide at least 63dB of attenuation in 1dB steps, as per the high-level specification. At this stage, it made sense to attempt to locate such a part, and indeed, one was found. The SSM2163 from Analog Devices is such a hybrid mixing device. It has respectable specifications, and is about $12 in quanitites between 10 and 100. One output from each mixer chip is fed to a position on each output bus. With the system in stock configuration with four mix boards, one chip drives each output bus line. In larger configurations, up to four mixer chips (from different mixer modules) may be attached to any one output bus line. The remaining output from each mixer chip shall be available for future upgrades such as inputs to DSP modules, etc. Figure 20 depicts a mix module. A stock system has only four of these boards, but up to sixteen may be used in a system.

Figure 20: Mixer unit, audio mix module diagram. Systems shall have four, eight or sixteen of these modules.
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next up previous contents
Next: Bus Combiner Module Up: Mixer Unit Previous: Audio Input Module   Contents
Steve Richardson 2000-07-06
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