SONY CDP-M57
¥ 29,800 (released in 1988)
Commentary
A compass and size CD player that can be combined with a mini component.
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.
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 digital filter is equipped with a 4 x oversampling digital filter.
The D/A converter is equipped with an L/Rch independent 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 chassis uses an integrated monocoque chassis for increased rigidity.
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 functions such as program performance of up to 20 songs, 5-mode repeat of one song / whole song / part (remote control only) / program / shuffle, music search for fast forward / fast backward while listening to a song, auto space for aligning between songs in 3 seconds, and so on.
A 16-track music calendar is installed on the display.
Equipped with a headphone port with volume.
Wireless remote control is included.
You can manually fade in and fade out with this remote control, as well as one touch direct selection with 16 keys, program selection, and delete shuffle function with the remote 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 ± 1 dB |
| Total harmonic distortion factor | 0.05% or less (EIAJ) |
| Signal-to-noise ratio | 100 dB or more (EIAJ) |
| Dynamic range | 90 dB or more (EIAJ) |
| Channel separation | 95 dB or more (EIAJ) |
| Wow and flutter | Below the measurement limit (± 0.001% W. peak) (EIAJ) |
| Output level | 2Vrms(Fixed) |
| Headphone output level | 10 mW (32 Ω) |
| Power consumption | 7.5W |
| External dimensions | Width 355x Height 80x Depth 275 mm |
| Weight | 3.0kg |
| Attachment | Wireless Remote Control RM-D170 |