Accuphase DP 75 V Brochure
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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)
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Linear phase analog filters provide superior characteristics Aliasing noise in the extreme upper frequency range is removed by a 3-pole linear phase type filter with outstanding phase characteristics. The cutoff frequency is designed to minimize phase shift within the passband. Strict selection of all filter components assures sonic purity and musical accuracy. Digital level control prevents sound quality deterioration The 24-bit MDS D/A converter in the DP-75V is not subject to the deterioration of resolution and allows precise level attenuation down to –60 dB. D/A converter with printed circuit boards made from Teflon (glass fluorocarbon resin) with low dielectric constant and low loss The D/A converter boards use a substrate of glass fluorocarbon resin which has a stable, low dielectric constant as well as superior heat resistance and high-frequency characteristics. Using this material for the audio circuitry assures signal transmission with the highest purity, resulting in a clear improvement in perceived signal-to-noise ratio. In the DP-75V, gold-plated copper traces further contribute to sonic purity. * Teflon is a registered trademark of DuPont USA. Fully balanced analog output circuitry The audio output section features balanced circuitry which is isolated from the ground line. To match any system configuration both a set of balanced XLR connectors and a set of RCA type unbalanced connectors are provided. nAssembly with DAI encoder/decoder, ultra jitter-free PLL circuit, and other digital processing circuits. Two MDS D/A conver ter boards (one each for right and left) use Teflon with a low dielectric constant and low loss. The analog output connector assembly is also visible. [CD Transport Section] Fully digital control of CD mechanism The control circuitry of the mechanism section is fully digital, allowing the use of adaptive filters to optimize servo performance for each individual disc. This assures enhanced operation stability and a drastic reduction in error rate. Laser pickup with integrated RF amplifier for error-free operation The pickup used in the DP-75V employs an RF amplifier which is so compact that it can be directly integrated in the photo detector pickup assembly. This assures that the high- level output signal remains free from noise interference, which in turn reduces the error rate.Balanced drive circuitry for CD actuators The motors and actuators that move the disc tray, spindle, sled, and the focusing and tracking assembly are driven by two amplifiers arranged in a balanced configuration. Because there is no current flowing in the ground line, the operation of other circuits in the player remains entirely unaffected. Tray lock prevents resonance Power-on play and frame display capability (1 frame = 1/75 second) nSupplied remote commander RC-25 Serves for input selection, direct play, repeat and program play, level adjustment and other functions.