Sony SDDS Print Master Manual do Utilizador descarregar pdf (Página 18)

6 SDDS - The i ndus tr y' s best sounding for mat

SDDS Print Master Guidelines, Page 18 of 26

6.5

Fur t her details – Why is it the bes t sounding syst em?

In normal operation the S DDS playback equipment uses both sides of the film for

playback. However, if one s i de i s damaged, the uni t will play in “digital concealment

mode”. This uses extra back up tr acks for the los t information. There i s a backup

centre and s ubwoofer . The l eft and r i ght channels are mi xed to cr eate l eft mix backup

and r i ght mix backup. These ar e pl ayed thr ough the appr opr i ate s peaker s at coded

volume level s . The effect of going i nto “DCM” is seamless. There i s always a di gi t al

centre s o dialogue i s not disturbed. T he two s i des are s epar ated fr om each other by

about 17 frames.

T he data r at e off film is 2.2Mbits/sec, rather than 370kbits/second.

T he data compr ession is Sony’s accl ai me d AT RAC, used i n broadcasting and i n minidisk

players. The compr ession ratio is only 5:1, rather than 10:1 or 13:1.

T here i s no data s har i ng between channels, all channels are full range 20kHz (even the

subwoofer ).

T he tr ack is printed i n the cyan layer. This is the deepes t layer and ther efor e the mos t

resistant to s cr atches . The r eader s also us e patented di ffuse light, which also

counteracts scratches. In normal use, with a well printed tr ack, the S DDS track will last

as long as the pi ctur e.

T he ci nema equi pment is built to S ony’s high broadcast standards. It features 28 band

digital EQ on all channels (2 band par ametr i c on the s ubwoofer ). All I/O i s balanced.

T he pi ctur e bel ow s hows the hi gh resolution, small dot size of SDDS (on the l eft) .

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Sony SDDS Print Master Manual do Utilizador Página 18