Technics SL-P170
Programmable Compact Disc Player
A New generation of CD Player using the MASH PWM Digital-to-Analog Converter
Linear Motor Transport
Multi-Function FL Display with Music Matrix
MASH Multi-Stage Noise Shaping
A new generation of CD Player using the MASH PWM DAC
We're entering a new era in digital audio - the MASH era. The SL-P170 and all new Technics CD players for 1990 are equipped with the new MASH PWM digital-to-analog converter system.
Technics's MASH PWM DAC helps improve low-level signal reproduction, and not just during quiet passages. Even during loud passages ambience and timbre are reproduced more accurately by the multi-stage noise-shaped pulse width modulation digital-to-analog converter. The standard for the future of compact disc fidelity is MASH.
MASH PWM digital-to analog converter LSI (MN6474) comprises a 4-DAC configuration and a 4-times oversamplig 16-bit digital filter.
The MASH PWM DAC vs. Conventional DAC
An ordinary digital-to-analog converter or DAC uses a "ladder" of resistors. Each "rung" has a different resistance, which corresponds to one of the digital bits in the compact disc system. The rungs are used in various combinations to produce 65,536 different possible voltage outputs. Unfortunately, the resistor value tolerances are extremely tight and cannot always be met. So differential nonlinearity and zero-cross distortion can exist even with laser trimming and 18-bit or 20-bit DAC designs.
However, The MASH PWM DAC avoids these problems. By using a high-speed switching device to reconstruct the analog waveform from digital data, the resistor-ladder network is history - and so are all of its problems/
Multi-Stage Noise-Shaping (MASH) Technology
In the MASH PWM DAC system, digital signal processing is used to prepare the 16-bit data from the compact disc for application to the PWM DAC. The MASH PWM DAC, developed by Technics engineers, applies multi-stage noise-shaping to shift requantization noise components from the audible energy spectrum to high-frequency extraneous areas, which will be eliminated by the final output filtration stages. Technics new DAC system combines both the benefits of MASH and PWM technology to eliminate differential nonlinearity and zero-cross distortion. The result is a more accurate reconstruction of the analog waveform for incredible sound reproduction.
Linear Motor Transport
The SL-P170 uses a linear motor to drive the laser pickup across the traverse mechanism. The linear motor is an expensive, precise way of moving the laser pickup, which provides remarkably accurate and responsive tracking of the microscopic data imbedded in the surface of the compact disc. often found in expensive compact disc players, linear motor transports are used by technics in all of our 1990 home component CD players. technics has used them for the past several years.
More Valuable Features
Dual Aspheric Glass Lens
4-DAC Design
4-Times Oversamplig 18-Bit Digital Filter
Edit Guide with Synchro Editing
The edit guide makes CD-to Tape transfer easy. First, you select a standard cassette tape length (C-60; C-46; C-90). The CD player will then check the disc and calculate which songs will best fit on each tape side. Synchro editing adds the convenience of simultaneous, linked operation when the CD player's editing jack is connected to the editing jack of selected technics cassette decks.
Multi-Function FL Display with Music Matrix
The 2-color fluorescent display provides useful information about programming and the disc in play. Simply press the time mode key to display the remaining or elapsed time. The Music Matrix will clearly show the programmed tracks and the track in play. When you're editing, the display will show which songs are assigned for recording on tracks A and B.
More Valuable Features
The SL-P170 features a remote control terminal for connection to selected technics wireless remote-controlled receivers via a supplied connection cord. This allows you to control the SL-P170 by the receiver's remote control
Auto-Cue
Random Access Programming
Specifications
Audio Section
Number of Channels: 2 stereo
Frequency Response: 2 Hz - 20 kHz +-1 dB
Signal-to-Noise-Ratio: 96 dB
Dynamic Range: 96 dB
Harmonic Distortion: 0,003%
Total Harmonic Distortion: 0,005%
Channel Separation: 94 dB
Wow and Flutter Immeasurable
Digital Filter: 4-times oversampling
D/A Converter: MASH 4-DAC system
Error Correction
Format : technics Super Decoding Algorithm
Pickup
Lens : Dual aspheric glass lens
Beam Source : Semiconductor laser
Wavelength : 780 mm
Traversa
System : Linear Motor Transport
General Section
Power Supply: AC 120 V 60 Hz
Power Consumption: 10 W
Output Voltage: 2V rms
Output Impedance: 1 k Ω
Load Impedance: More than 10 k Ω
Dimensions (W x H x D): 430 x 88 x 284 mm (16-15/16" x 3-15/32" x 7-7/32")
Weight: 3,5 kg (7,7 lbs)
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