Sony's Synchronous Time Accuracy Controller
(S-TACT) resolves the problem by isolating clock
generation and voltage pulse generation on their
own IC. Removed from high-speed digital opera-
tions, the S-TACT circuit draws clean, noise-free
power. This means that digital pulses approach
full quartz accuracy. Jitter—and jitter-induced
distortion—are dramatically reduced.
8
Conventional circuits place the clock generator on the same chip as high-speed digital operations—exposing
the clock pulses to harmful noise. Sony's S-TACT circuit isolates the clock generator from digital noise.
Digital Operation Stage
D/A Converter Stage
Digital Filter
ACP System
Audio signals
Data [64ƒs]
Data
Data
Data
512ƒs
256ƒs
BCK [64ƒs]
Noise Shaper
BCK
LRCK
To
external
system
To
external
system
Voltage Pulse
Generator
&
Clock Generator
Because the digital operation stage is completely
separate from the D/A converter, noise is not mixed in
Improved time axis precision and
improved sound quality
Digital noise is carried into the D/A converter stage
Deterioration of time axis precision and
deterioration of sound quality
Digital Filter
Current Pulse
D
/
A Converter
[V/I Pulse Converter]
I/V Conversion
&
Low-Pass Filter
Audio signals
Current Pulse
D
/
A Converter
[V/I Pulse Converter]
I/V Conversion
&
Low-Pass Filter
Noise Shaper
Pulse
Generator
Clock
Generator
Conventional System
Fig. 8 Comparison of Conventional System and S-TACT
Digital Operation Stage
D/A Converter Stage
S-TACT
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