About TDM

Logic Pro allows you to use the TDM functions of Pro Tools HD systems. TDM is an abbreviation for Time Division Multiplexing—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 the individual TDM-capable (PCI or PCIe) cards.

Up to 512 digital audio channels, each with 24-bit resolution, can be transmitted on the TDM bus. These streams form the 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.

Logic Pro allows 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. See ESB TDM and EXS24 TDM.

Note: It should be noted that the TDM channel count is sample-rate dependent, so if a rate of 88.2 or 96 kHz is used, the 512 channels available to a Pro Tools HD system will be halved to 256. At a sample rate of 192 kHz, this will again be halved to 128.