Sony STR-DA9000ES - Fm Stereo/fm-am Receiver Background tecnico - Pagina 3
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Digital amplifiers have been around for decades, occupying a place
outside the mainstream of home audio. But important trends in audio technology
are creating significant reasons to prefer digital amplification.
First, digital signal-handling technology has improved, especially in the
area of 1-bit digital signal processing. Modern circuitry can exercise amazingly
precise control over 1-bit pulse lengths, pulse height and pulse timing, for jitter-
free, distortion-free performance. Large Scale Integrated (LSI) technology
continues to move forward, enabling manufacturers to build this sophisticated
technology into consumer products. Today's faster output transistors do a better
job at digital switching speeds. Finally, home entertainment continues to move
inexorably into the digital domain, leaving analog processes behind.
Simultaneous with these advances, the function of the home audio
receiver has been transformed. "High fidelity" or "AM/FM" receivers have long
since given way to sophisticated A/V control centers that first handled composite
video, then added component video, HD component video and now digital
component video. Over the years, stereo receivers have been transformed into
four, five, six and now seven-channel receivers. And the designs continue to
grow in complexity. In this new context, digital amplification is becoming more
and more compelling.
It was for this reason that Sony first developed the S-Master process back
in 2001. The 2003 ES receivers, starting with the STR-DA2000ES, incorporate
Sony's third generation of S-Master technology—and our most advanced by far.
Process
S-Master
Generation
First
2001
Introduction
• Clean Data Cycle
Technologies
• C-PLM
• S-TACT
ES Receivers V3.0
S-Master Pro Technologies
"Digital Drive" S-
Master
Second
2002
AVD-C70ES
AVD-S50ES
• Clean Data Cycle
• C-PLM
• S-TACT
• Pulse Height Volume
Control
S-Master Pro
Third
2003
STR-DA9000ES
STR-DA5000ES
STR-DA3000ES
STR-DA2000ES
• Clean Data Cycle
• C-PLM
• S-TACT
• Pulse Height Volume
Control
• DC Phase Linearizer
• Discrete Output
Transistors
• Toroidal Low Pass Filter
• Two-Stage Pulse Power
Supply
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