Sony STR-DA5000ES - Fm Stereo/fm-am Receiver Техническое обоснование - Страница 7

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(B) audio elements

The action of the LPF. The audio signal (B) consists of low frequencies,

which pass. The red lines show the characteristic of the LPF, which

suppresses the noise elements (C) on the right. These are high

frequencies, which do not pass.

While Sony's S-Master Pro amplifier is simple in principle, the fidelity of

the output signal depends on getting each pulse exactly right. That is, the

leading and trailing edges of each pulse must have the right timing—and the

height of each pulse must be carefully controlled. This is comparable to the

requirements for Super Audio CD playback. So to accomplish these goals, Sony

used technologies developed for our legendary SCD-1 Super Audio CD player.

Sony's own CXD9730 Large Scale Integrated circuit (LSI) provides the

S-Master Pro processing.

The S-Master Pro process converts the incoming signal to a one-bit

Complementary Pulse Length Modulation (C-PLM) stream, after which the Pulse

Height Volume control sets the volume level. The S-Master Pro process is

performed by the Sony CXD9730, a proprietary Sony Large Scale Integrated

circuit (LSI).

ES Receivers V3.0

Low-Pass Filtering (LPF)

Frequency

The S-Master Pro process

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