signals to improve the S/ N ratio for a substantially richer dynamic range. Since the DVD-5000 is equipped with an HDCD decoder, the
Peak Extension and Low-level Extension features are accessed and combined with Denon’s own 96 kHz, 24-bit 4-DAC system to fulfill the maximum potential of HDCD's remarkable sound quality.
The DVD-5000 also automatically senses the type of disc that has been loaded (ordinary CD, DVD disc, or HDCD), then processes the signals based on the type of disc detected.
■Independent D/A Converter
The DVD-5000 can also be used as a D/A converter. The front panel Source switch directs the digital input signals coming in
through one of the two digital input terminals (optical or coaxial) so that it passes through the unit’s AL24 Processor and D/A converter for output as a clean, highly accurate analog signal.
■Color Component Video Output
The DVD-5000 is equipped with a color component signal video output capability that faithfully outputs the analog signals resulting from direct and high-precision D /A conversion of the Y, Cb and Cr signals recorded on DVD. “S” and composite video outputs are also provided (2 of each).
■Vibration-resistant Construction
The DVD-5000 protects the DVD and the transport mechanism from unwanted vibrations using a centrally located holder with low center of gravity firmly secured with mechanism brackets to the unit’s highly rigid, copper-plated chassis. This mechanism is further isolated from the digital, video and audio circuits which have each
been mounted on their own copper-plated board so that the circuits can be thoroughly protected from mutual interference and vibrations. The overall chassis of the DVD-5000 is constructed of a 15mm thick aluminum front panel, a double-layered top cover and a quadruple-layered bottom chassis assembly. All these parts have been secured with vibration-absorbent sintered alloy insula- tors to produce a construction that is totally protected from both internal and external vibrations.
■Easy-to-use Graphical User Interface (GUI)
■Parts Strictly Selected for Sound Quality
Three sepa- rate transform- ers have been employed for the
audio, video, and
control sections. Transformers specially constructed with vibration- resistant materials are used in the audio and video sections. In addition, the same strictly-selected parts whose performance has proven to be reliable
during the development of Denon’s S1 series of audio components -- such as the removable ultra-thick AC power cord; very low ESR electrolytic capacitors, film capacitors and carbon resistors designed for high sound quality; and the high speed
operational amplifiers selected for highest sound quality -- have gone into the DVD-5000.
■High-performance Pickup and Digital Servo Technology
In order to read the maximum 8.5 gigabytes of data that can be record- ed on one side of a DVD, the DVD-5000 uses a self-excited oscillator type red laser with a wavelength of 650nm to ensure stable, low-noise perfor- mance. In addition, the pickup lens used with this laser employs an integral molding hologram that enables DVD and CD program sources to be read by the same pickup. As a result, the DVD-5000 features the shortest possible signal paths, a simplified construction and superior reliability.
■Gold-plated Audio and Video Terminals
■Digital Theater Systems (DTS) Compatible Digital Output
■Easy-to-use Remote Control with Backlit Keys
A L P H A P r o c e s s i n g a n d A L 2 4 P r o c e s s i n g
■Expanding to Input Signal Bit Length of 24 Bits
While the original ALPHA Processing system generated four lower bits of data for the 16-bit input data to obtain data of 20-bit quality, the new AL24 Processing uses two calculating circuits in its lower data generation section to generate eight bits, to which the upper 16 bits of data is then added, producing an output signal of 24-bit quality (Figure 1).
First of all, the data reproduced from a CD is input “as is” in its 16-bit staircase form to the ALPHA processor, as shown in waveform (A) of Fig. 2. The processor then extrudes the rate of change in 1 LSB, whether positive or negative, from the portions of waveform (A) where a change in the data has occurred and produces waveform (B).
Next, the ALPHA processor uses its lower-
order bit data generator to produce data for | Impulse Response |
the four lower-order bits, 17-24, that should | | | | |
normally exist below the 16 bits as shown in | | | | |
waveform (C). The result is waveform (D), | | | | |
where lower-order bit data for each 1/16 LSB | Conventional | | | AL24 Processing |
point of change is generated. | | Square Wave |
Finally, the higher-order bits of waveform | | | | |
| | | |
(A)are added to waveform (D), producing the synthesized waveform shown in wave-
form (E). This waveform reflects the smooth | Conventional | | AL24 Processing |
24-bit oversampled data that is reproduced | | | |
with superb audio clarity. | | | |
