Apple Logic Pro 9 (TDM Guide) - Manual (Page 5)

Earlier Digital Audio Workstations (DAWs) took one of two approaches to audio signal
processing: The use of dedicated hardware DSPs (such as in TDM systems), or the native
processing capabilities of the computer CPU.
Logic Pro enables you to use both your TDM system DSPs and the computer’s native CPU
processing resources. The link between the DSP world of your TDM system, and your
computer’s native CPU processing resources is ESB TDM.
This preface covers the following:
• About Logic Pro TDM Support (p. 5)
• About the Logic Pro Documentation (p. 6)
• Additional Resources (p. 6)
About Logic Pro TDM Support
Logic Pro provides access to many of the TDM functions supported by
Pro Tools HD systems. Time Division Multiplexing (TDM) is the time-interlaced transmission
of multiple digital audio signals (or streams) through a single data bus. This bus system
is physically isolated from the computer system bus, and runs between individual
TDM-capable cards. Up to 512 digital audio channels, each with 24-bit resolution, can be
transmitted on the TDM bus. These streams form signal paths within a virtual mixer. These
signal paths are necessary for the insertion of plug-ins, which are calculated on the
DSP hardware, and routed into the individual channels, or are selected through auxiliary
busses.
5
An Introduction to Using
TDM Hardware in Logic Pro
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