Accuphase DP 700 Brochure
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Extracted text from Accuphase DP 700 Brochure (Ocr-read)
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The ultimate integrated SA-CD/CD player - High-rigidity, high-precision SA-CD/CD drive combined with exquisite disc tray and ultra-smooth loading mechanism. Ground-breaking MDSD (Multiple Double Speed DSD) digital signal processing circuitry constitutes a moving average lter for straight D/A conversion. Superior quality digital audio interface HS-Link. When Accuphase introduced the ultimate separate-type SA-CD/CD player, the models DP-800 and DC-801, a new epoch in audio history had begun. Garnering worldwide acclaim both for their technological excellence and sound quality, the transport and processor pair has become the new reference for SA-CD reproduction. The new DP-700 is an integrated type SA-CD player incorporating that very same state-of-the-art technology. Major highlights are the ultra-rigid SA-CD/CD drive assembly and the MDSD principle that takes the DSD signal straight from the digital to the analog domain. Latest digital signal processing technology is in evidence throughout. Extensive series of listening tests were conducted to shape the DP-700 into the worlds foremost integrated SA-CD/CD player. As with all other Accuphase players so far, a conscious decision was made not to support multi-channel formats but rather focus on extracting the ultimate in musical fi delity from two-channel SA-CD music sources. In the transport section, a dedicated DSP chip controls the digital servo to assure accurate readout of the signal recorded on the SA-CD. Another vital aspect is the single-lens/twin laser diode pickup mounted to a high- speed positioning mechanism, providing a signifi cant improvement in read access times and accuracy. The processor section features the innovative MDSD principle forming a sophisticated moving average filter circuit, together with the MDS++ D/A system that keeps conversion errors to an absolute minimum and at the same time acts as high-cut fi lter effi ciently removing noise components in the high frequency domain. The Direct Balanced Filter provides separate low-pass fi ltering for the balanced and unbalanced signal paths, and the analog balanced output circuitry eliminates interference during signal transmission. The overall result is simply outstanding sonic performance that removes the last veil from the music and beautifully demonstrates what the SA-CD format is all about. Internally, the transport and processor sections of the DP-700 are kept entirely separate. Digital inputs allow independent use of the processor section for external sources to enjoy music reproduction with the same superb quality. Accuphase Exclusive Digital Interface HS-Link : High Speed Link HS-Link is an ultra high-quality digital audio interface developed by Accuphase using the latest digital signal transmission technology. It supports send/receive verifi cation for copyright protection. The LVDS (Low Voltage Differential Signaling) principle allows a single dedicated HS-Link cable to transmit all audio data with utmost fi delity, including 2.8224 MHz/1-bit and 192 kHz/24-bit signals. Features and Functions of Transport Section n High-rigidity, high-precision SA-CD/CD drive Highly rigid and precise construction with sturdy, heavyweight chassis to absorb external vibrations Traverse Mechanism with fl oating design Massive aluminum alloy bridge Low center of gravity to further reduce vibrations High-quality disc tray extruded from an aluminum block, plus super-quiet smooth disc loading mechanism n SA-CD/CD transport outputs ultra pure digital signal n Single-lens/twin pickup high-speed access mechanism n Support for text data display n Accuphases proprietary digital audio interface HS-Link (carries both SA-CD and CD signal) High-rigidity, high-precision SA-CD/CD drive Aluminum alloy bridge Traverse Mechanism Disc tray Mechanism base Viscous dampers DP-700 Block DiagramHS-Link Block Diagram
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n Supplied remote commander RC-100 Gives access to various functions including direct play, repeat, pro- gram play, input switching, and level control.The DSD signal from the input is upsampled by a factor of 2, resulting in a sampling frequency of 5.6448 MHz/1-bit. After volume processing, the circuit performs D/A conversion using a highly ingenious moving-average fi lter principle. In the DP-700, this involves seven delay devices and eight MDS++ type D/A converters. The signal is delayed (shifted) progressively by one clock cycle to produce eight signals which are sent to separate D/A converters for direct D/A conversion. The converted signals are then summed. Since conversion errors are kept to an absolute minimum by the use of MDS++ type DACs, the MDSD principle results in an 8-pole high-cut fi lter with perfectly linear phase characteristics. Innovative digital signal processing : MDSD (Multiple Double Speed DSD) Digital input DSD signal m Reduces noise during volume processingm Shifts the effective fi lter frequency upwards Digital volume processingVolume Upsampler x2 2.8224 MHz/1-bit 5.6448 MHz/1-bit 5.6448 MHz/1-bit Delay device Delay device Delay device Delay device Delay device Delay device Delay device Delayed by 1 clock cycleNormal phase output Reverse phase output Moving-average fi lter circuit DAC output Current summing Voltage summing I (Current) - V (Voltage) converter