Sony TA-F707ES Technical Background - Page 10
Superior dynamic range., Higher accuracy for the Clean Data Cycle.
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As a primary manufacturer of Large Scale Integrated circuits (LSIs), Sony has the freedom to pursue innovative thinking like S-Master Pro and then express this thinking in silicon. The result is Sony's own CXD9773Q. • Superior dynamic range. The previous S-Master Pro LSI achieved 24-bit processing at 1024 fs. This translates to an impressive 34 bits of resolution at the 48 kHz sampling rate (fs). The new CXD9773Q goes much further, with 32-bit processing at 1024 fs. Internal dynamic range at the 48 kHz sampling rate is improved from 180 dB to 228 dB. When Super Audio CD signals are sampled at 8 fs, the internal dynamic range improves from 162 dB to 210 dB out to nearly 100 kHz. Clearly, the new 32-bit processor has more than enough dynamic range for the most demanding digital audio sources. • Higher accuracy for the Clean Data Cycle. Because one-bit digital signals depend on the accuracy of the time domain, Sony suppresses jitter with Clean Data Cycle. Our 24-bit processor achieved a theoretical accuracy of 40 femtoseconds. One femtosecond is 1/1,000,000,000,000,000 second (in scientific notation, 10-15 second). For comparison, it takes a billion femtoseconds to equal one nanosecond. Stated another way, there are as many femtoseconds in one full second as there are seconds in 30 million years! So it's fair to say that accuracy of 40 femtoseconds is fairly precise. However our 32-bit processor goes well beyond this, to an accuracy of 0.08 femtoseconds (or 80 attoseconds, if you prefer). This is about the same time it takes an electron to fluctuate within a single lattice of a metal crystal. So we can say that the 32-bit Clean Data Cycle reduces jitter to the theoretical minimum. (Note: This measure, 80 attoseconds is roughly four orders of magnitude more precise than the jitter induced by chassis vibration. From a practical standpoint, suppressing chassis vibration has a great impact on the final sound quality.) ES Receivers v1.0 Page 10