Benchmark DAC1 HDR Manual de instrucciones descargar pdf (Pagina 45)

DAC2 Series Instruction Manual Rev C Page 45

udio Precision DAC2 - Differential Phase

Fs = 96 kHz

DAC2 - Differential Phase.at27

ColorSweep Trace Line Style Thick Data Axis Comment Cursor1 Cursor2

1 1 Green Solid 4 Anlr.Phase Left -0.09 deg -0.21 deg

2 1 Red Solid 4 Anlr.Phase Left *+0.24 deg *+0.47 deg

-1

-0.8

-0.6

-0.4

-0.2

+0.2

+0.4

+0.6

+0.8

+0.24

+0.47

2.5k 45k5k 7.5k 10k 12.5k 15k 17.5k 20k 22.5k 25k 27.5k 30k 32.5k 35k 37.5k 40k 42.5k

20.2555k 40.0511k

dx=19.7956 kHz d

=+0.23 de

Graph Plot 6 - Differential Phase

This plot demonstrates the inter-channel phase accuracy of the DAC2. From this plot, the inter-

channel phase accuracy is calculated to be +/- 0.17 degrees at 20 kHz, and +/- 0.34 degrees at 40

kHz.

The phase accuracy of the DAC2 is almost the same as the phase accuracy of the Audio Precision

2700 test set. For this reason, the phase error in the AP must be subtracted from the

measurement. The green trace assigns the left channel to channel 1 of the AP, and the right

channel to channel 2 of the AP. The red trace reverses the inputs. The two traces must be

averaged to remove the phase errors of the AP test set.

DAC2 converters are phase-accurate between boxes. Three DAC2 converters can be used as a

group to form a phase-accurate 5.1 surround system. Four DAC2 converters can be combined to

form a 7.1 system. The phase accuracy between any two channels will match the phase accuracy

shown above.

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Benchmark DAC1 HDR Manual de instrucciones Pagina 45