Accuphase DP 75 V Brochure

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Accuphase DP 75 V Brochure

Extracted text from Accuphase DP 75 V Brochure (Ocr-read)

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A new-generation CD player that reproduces even the most subtle musical details - Revolutionary MDS (Multiple Delta Sigma) converter with 24-bit ultra high precision. Separate CD transport and processor sections. Ready for handling input from new-generation digital sources such as SACD and DVD-Audio. Fully digital control of CD mechanism. The DP-75V incorporates the latest advances in digital technology. Processing performance was upgraded to handle the new generation of super high resolution audio sources such as SACD and DVD-Audio. Enhanced sound quality is also available with existing CDs. Although the DP-75V may look like a conventional integrated Compact Disc player, it really consists of a separate transpor t section and a digital processor each of which can be used on its own. The processor features a revolutionary MDS (Multiple Delta Sigma) converter with superb 24-bit precision. This ensures ultra low distortion and outstanding signal-to-noise ratio. All other performance aspects have also been significantly improved. Digital inputs allow the routing of exter nal digital sources through the conver ter of the DP-75V, for playback of any format source with exceptional sound quality. To ensure future upgradability, the unit has option board slots that support the ADB 2 (Accuphase Digital Bus 2) interface which accommodates next-generation formats such as SACD and DVD-Audio. The EXT DSP option board slot allows connection of the DG-28 Digital Equalizer for sound field compensation in the digital domain. The simple, refined design of the DP-75V complements its technological prowess. The overall result is music reproduction of such clarity and detail definition that you will discover a whole new dimension of enjoyment even in long-familiar CDs. [Digital Processor Section] Innovative MDS (Multiple Delta Sigma) converter reduces distortion to theoretical limits and assures outstanding S/N ratio The output signal is generated by a newly developed D/A converter that provides excellent performance and sound quality. The MDS (Multiple Delta Sigma) principle employs several delta sigma type conver ters in a parallel configuration, resulting in a dramatic enhancement of precision. The delta sigma principle combines oversampling with noise- shaping (a kind of digital feedback) to project the amplitude information of the digital signal onto a time axis for precise conversion. Figure 2 shows several delta sigma conver ters that are fed the same signal and whose outputs are combined to arrive at the overall waveform. In the DP-75V six delta sigma converters are operated in parallel, resulting in a performance improvement by a factor of 2.45 (=Ö6). An impor tant charac-teristic of the MDSprinciple is that the performance benefits are achieved regardless of signal frequency and signal level. Thus noise at very low signal levels, that was difficult to contain with conventional delta sigma converters, can now be drastically reduced. The audible result is music reproduction emerging from complete silence with an impressive sense of clarity and nuance. Ultra jitter-free PLL circuit For synchronizing the operation of the D/A converter with the digital audio interface (DAI), a phase-locked loop (PLL) circuit is used which generates a master clock to be used as a system reference. As shown in Figure 3, the Ultra Jitter-Free PLL Circuit of the DP-75V consists of a preamble detector and a voltage- controlled oscillator (VCO) using a quartz cr ystal element. The master clock produced by this PLL circuit is free from the effects of pulse distor tion and jitter. Separate processor section with coaxial and optical input for digital signals A digital input allows the user to enjoy the top-level performance of the processor section with other components that can supply a digital signal. In addition, a digital output lets the user connect a DAT recorder, MiniDisc recorder, or other component capable of recording a digital signal, so the output of the CD transpor t or the signal from connected external sources can be recorded. A direct connection from the digital output of the CD transpor t section to the Digital Preamplifier DC-330 is also possible. Fig. 1 Block diagram of DP-75V processor Fig. 2 MDS type D/A converter principle Fig. 3 Ultra jitter-free PLL circuit Unbalanced Outputs Left Analog Outputs 1 2 Balanced Output 3 Pole Linear Phase Low PassFilter Balanced Buffer Option Slot 1 Digital Inputs Option Slot 3 Option Slot 2 Coax RX Opto RX Opto RX Opto RXCoax CoaxMaster Clock DAI Decoder Ultra Jitter Free PLL Format Converter Output Level Digital Isolator MDS 24bit D/A Conver ter ×6 Opto RX Coax RX External DSP Option ( DIO-OC1) Digital Outputs Digital Filter Output Level Digital Filter MDS 24bit D/A Conver ter ×6 Digital Isolator Unbalanced Outputs Right Analog Outputs 1 2 Balanced Output 3 Pole Linear Phase Low PassFilter Balanced Buffer DS DS DP-75V CD Transport Section DAC #1 #2 S 1 e1 S2 e2 Sn-1 en-1 S0 e0 Sn en #1 # n MDS output Digital inputSignal Conversion error VCO DAI input signal Preamble detector Preamble signal (pulse distortion removed) Phase comparator Loop filter Frequency divider Master clock output (free from jitter and pulse distortion)