SONY CDP-770
¥ 39,800 (released in 1988)
Commentary
A CD player with an 8fs18-bit digital filter.
The digital filter is equipped with an 8fs18-bit noise-shaping digital filter.
This circuit expands the distance between the audio signal and the unwanted high-frequency component by resampling the signal at 352.8 kHz, which is eight times the sampling frequency of 44.1 kHz for CD. It enables the use of a low-order low-pass filter with a gentle cut-off characteristic in the analog part after D/A conversion. This greatly improves the group delay characteristics.
In the CDP 770, the digital filter performs 18-bit arithmetic and noise shaping, and achieves four times the resolution of 16-bit D/A conversion.
The D/A converter is equipped with a high-speed dual D/A converter.
In addition, the audio circuit after D/A conversion is also a twin-mono configuration that follows the signal flow, eliminating phase shift and mutual interference between channels.
The servo circuit is equipped with S Servo III.
The SS Servo III, noise components that cause adverse effects are removed through a low-pass filter, and the influence on the audio circuit is reduced by sending a smooth servo current to the servo circuit. Moreover, unnecessary vibration of the optical system mechanism is also suppressed.
The chassis uses an integrated monocoque chassis for increased rigidity.
Equipped with an optical digital output.
Equipped with digital de-emphasis function.
In digital de-emphasis, the de-emphasis process conventionally composed of analog circuits is digitally processed inside the digital filter, eliminating sound quality degradation caused by parts and circuits, and achieving ideal gain and phase characteristics.
It is equipped with a custom edit function that combines three functions : time edit, program edit, and time fade.
With Time Edit, you enter the time for one side of the tape and press the Edit button to program the music to be played in order from the first song. When you encounter a time-over song, the program automatically selects the longest song within the time range. Press the Edit button once to continue the program for the A side, and press the Edit button again to continue the program for the B side. The pause is automatically inserted between the A side and the B side.
In program edit, you program the songs you want to put on the A side of the tape in the order you like, then press the pause button and continue to program the B side.
With the Time Fade function, if you set the time beforehand, the FOMA terminal automatically fades out approximately five seconds before the time and enters a pause state.
It has a manual fader function.
It is equipped with functions such as the program performance function of up to 20 songs, 5-mode repeat of 1 song / whole song / part (remote control only) / program / shuffle, and auto space which adjusts the interval between songs to 3 seconds.
Equipped with 2-speed music search. Slow mode can only be operated from remote control.
The display section has a 20-track music calendar.
Equipped with a headphone jack with a lineout linked volume whose LED blinks when remote control is operated.
Equipped with delete shuffle function.
Comes with a wireless remote control with volume control.
Model Rating
| Type | CD Player |
| Reading system | Non-contact optical reading (using semiconductor laser) |
| Laser | GaAlAs double hetero diode |
| Number of revolutions | 200 ~ 500 rpm (CLV) |
| Playing speed | 1.2m/s ~ 1.4m/s (constant) |
| Error correction method | Sony Super Strategy Cross Interleaved Read-Solomon Code |
| Number of channels | 2 Channel |
| Frequency characteristic | 2 Hz to 20 kHz ± 0.3 dB |
| Total harmonic distortion factor | 0.003% or less (EIAJ) |
| Signal-to-noise ratio | 102 dB or more (EIAJ) |
| Dynamic range | 95 dB or more (EIAJ) |
| Channel separation | 98 dB or More (EIAJ) |
| Wow and flutter | Below the measurement limit (± 0.001% W. peak) (EIAJ) |
| Output level | 0 V ~ 2 Vrms (Variable) |
| Digital output | Optical : -18dBm (emission wavelength 660 nm) |
| Headphone output level | 15 mw (32 Ω) |
| Power consumption | 9W |
| External dimensions | Width 430x Height 100x Depth 275 mm |
| Weight | 3.6kg |
| Attachment | Wireless Remote Control RM-D470 |