YAMAHA CD-450
¥ 54,800 (released in 1985)
Commentary
CD player with high sound quality by using quality parts.
A power supply circuit using a high-voltage capacitor and high-voltage diode is mounted, and an electrolytic capacitor for audio equipment is used around the D/A converter.
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.
The optical head uses a 3-beam system, in which three beam lines are applied to the track direction, the signal is read with the middle beam, and the track shift is detected in real time with two beams.
A high-precision trace of ± 0.2 micron has been realized by a three beam system and a high-speed servo mechanism.
A highly reliable shaft slide type actuator is used to control the focus direction and tracking direction.
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.
In addition, the analog low-pass filter is composed of a third order active filter, which suppresses sharp changes in phase characteristics and acquires simple characteristics.
It is equipped with monitoring functions such as 2-speed search, track search, 9-track random program, repeat playback function between all tracks / program / A and B, and index search.
It has a headphone port.
Wireless remote control is included.
Model Rating
| Type | CD Player |
| Optical head | 3 Beam Laser / Axis Slide Type |
| Filter | Digital filter Third order analog active filter |
| Frequency characteristic | 5 hz ~ 20 khz + 0.5 -1.0 db |
| Harmonic distortion factor | 0.004% (1 kHz, EIAJ) |
| Signal-to-noise ratio | 98dB(EIAJ) |
| Dynamic range | 95dB(EIAJ) |
| Channel separation | 90dB(1kHz) |
| Wow flutter | Below the measurement limit |
| Output voltage | 2Vrms |
| External dimensions | Width 435x Height 94x Depth 290 mm |
| Weight | 4.2kg |
| Attachment | Wireless Remote Control |