YAMAHA CD-550
¥ 69,800 (released in 1985)
Commentary
A CD player equipped with an LSI exclusively for CD developed by Yamaha.
We have adopted a newly designed LSI that is finer than before and has increased the circuit integration by adopting the 2 μ m rule.
The signal processing LSI with built-in digital filter is an N-MOS type, and has a structure that integrates various digital signal processing including interleave demodulation, error detection and error correction.
The servocontrol LSI is a C-MOS type that enables high-speed processing and low power consumption. It performs signal processing such as demodulation of EFM signals and sub-codes as well as various servocontrol including optical heads, and eliminates the influence of disturbance and provides highly reliable disk control.
A 3-beam system is used for the pickup section. In the 3-beam system, three beam lines are applied to the track direction, the signal is read by the middle beam, and the track shift is detected in real time by the two beams.
A high-precision trace of ± 0.2 micron has been realized by a three beam system and a high-speed servo mechanism.
The optical head employs an axis slide type actuator, which realizes high tracing capability by combining it with a high-precision high-speed servo system combined with a CD LSI.
The aspherical objective lens realizes a simple head part.
Equipped with a digital filter with 2 x oversampling, the CD signal sampled at 44.1 kHz is doubled to 88.2 kHz, reducing the load on the analog low-pass filter.
The analog low-pass filter is composed of a 5th-order Butterworth type active filter, which suppresses abrupt changes in phase characteristics and acquires simple characteristics. The analog low-pass filter is also made with carefully selected high-quality capacitors.
You can repeat all songs or program songs, or repeat playback between A and B to repeat playback of any specified section.
Equipped with 2-speed search capable of monitoring.
Equipped with 4-digit LED display.
Equipped with a headphone port with volume.
Wireless remote control is included.
Model Rating
| Type | CD Player |
| Optical head | 3 Beam Laser / Axis Slide Type |
| Filter | Digital filter Fifth order analog Butterworth type active filter |
| Frequency characteristic | 4 hz ~ 20 khz + 0.5 -1.0 db |
| Harmonic distortion factor | 0.004% (1 kHz, EIAJ) |
| Signal-to-noise ratio | 100dB(EIAJ) |
| Dynamic range | 96dB(EIAJ) |
| Channel separation | 92dB(1kHz) |
| Wow flutter | Below the measurement limit |
| Output voltage | 2Vrms |
| Feature | Nine track random program Index search Repeat (all songs / program songs / between A and B) |
| External dimensions | Width 435x Height 94x Depth 290 mm |
| Weight | 4.5kg |
| Attachment | Wireless Remote Control |