Usl JSD-100 Specifications download pdf (Page 10)

Page 10

Figure 4.2a Audio Processing Overview

The output of the mixer or internal generator is routed to the main fader control. The output is then routed to a

delay for both projector synchronization and surrounds. The crossover includes individual delays for high and low

bands. Each channel, with the exception of LFE, HI, and VI-N, has a 27 band graphic equalizer including bass and

treble shelving filters. After equalization a channel filter process can be applied. The channel filter can be used to

apply special effects to a specific channel. For example, it may be desirable to notch out dialog frequencies on a

generated Lc or Rc channel. The channel filter supports high pass, low pass, band pass, notch, and disabled. The

LFE channel is routed through a parametric equalizer and a 125Hz low pass filter as specified by SMPTE EG0432-2-

2006. When the internal crossover is not used, full-range audio is sent to the low-band outputs. The outputs are

driven with balanced line drivers through solid state switches used for muting. Similar switches route bypass audio

to the left and right outputs when required.

As shown in Figure 4.2b, each input is digitally converted (analog to digital or sample rate conversion) and routed

to the mixer within the DSP. The two channel sources are converted and then routed to a Sample Rate Converter

(SRC) that can be either mixed or have an active matrix applied to them to generate six digital audio sources (5.1

channels). The COAX and TOSLINK sources can have the either a two channel mix or six channel decode. The

optional DI-84 board is required to decode Dolby Digital ®, DTS, or apply an active matrix, each converting the two

channel signals to 5.1 channels.

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Usl JSD-100 Specifications Page 10