OnAir 2000M2 Digital Mixing Console
Date printed: 12.11.03 SW V4.0 Features 1-3
The signal processing is based on 24-bit DSPs from Texas Instruments
(TMS57070). The input channels are processed by 12 DSPs (i.e. two
stereo channels per DSP. The summing bus is a PLD (programmable logic
device) design and can handle up to 32 bit. The resulting sums are further
processed by three additional DSPs.
A serial communication link between the host controller and the DSPs
downloads the algorithms at the startup and sets new parameters during
operation.
1.3 Audio Buses
PGM: Main output bus, stereo or mono, analog and/or digital
REC: Main output bus, stereo or mono, analog and/or digital
AUX 1: Auxiliary output, stereo or mono, analog and/or digital
AUX 2: Auxiliary output, stereo or mono, analog and/or digital
N–1 A: Clean-feed output, mono, analog and/or digital
N–1 B: Clean-feed output, mono, analog and/or digital
AUDITION: Audition output (clean-feed), stereo or mono, analog and/or digital.
Internal buses:
PFL: Pre-fader listening bus, stereo
TB: Talkback from control room, talkback from studio.
1.4 Host Controller
The host controller is a Motorola MC68360 running at 25 MHz. The tasks
performed by the controller are:
• SW download to the DSPs
• SW download to the graphics controller
• Communication with the user surface
• Communication with DSPs
• Communication with modules
• Logic functions
• Graphics
• System test and error handling
• Flash EPROM handling
The software is based on a VRTX real-time operating system. VRTX was
originally designed for industrial applications and is very reliable. The
complete application is written in the “C” programming language.
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