Sony STR-DA7100ES - Fm Stereo/fm-am Receiver Техническое обоснование - Страница 7

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carefully at the pulses, you'll see that where the audio waveform is positive, the

pulses are mostly 1. Where the audio waveform is negative, the pulses are

mostly 0. In this way, a 1-bit pulse stream can represent the audio signal. As

with a DSD signal, a Low Pass Filter (LPF) is all you need to recover the original

audio signal.

In the diagram above, (A) represents the output power pulse stream.

This combines two components, the original audio signal (B) and a

noise component (C). The audio signal (B) looks smooth and

continuous because the frequencies are low. The noise component (C)

looks abrupt and spiky because the frequencies are high. The Low

Pass Filter (LPF) effectively separates out the audio signal, for

extremely accurate music reproduction.

Inside the S-Master Pro process

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 CXD9773Q S-Master Pro LSI incorporates several stages of

crucial signal processing.

In specific, the S-Master Pro LSI incorporates five important technologies:

• Clean Data Cycle. "Jitter" or time-base errors can degrade the accuracy of

digital signals. That's why the first stage of the S-Master Pro process is

Sony's Clean Data Cycle. This regenerates the digital signal with time-axis

accuracy equivalent to the original A/D converter at the recording studio. In

ES Receivers v1.0

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