Kenwood DM-SG7 User Manual

DM-SG7(EN)
10
MD system
The Mini Disc system has the features as summarized in the following.
1 Like CD (Compact Disc), playback can be started from any position. (Random access)
2 It uses a disc with a diameter of 64 mm that is accommodated in a cartridge.
3 Two types of discs can be used. (playback only discs, recordable / playable discs).
4 Up to 80 minutes of recording or playback is possible using high-efficiency coding technology.
5 Countermeasure against vibration is taken using semiconductor memory chip.
Playback-only Mini Disc
This type of MD can be used only for playback, and is used by the commercially-available music MD software packages.
The playback-only MD is an optical disc like the Compact Disc (CD). The signals are recorded as the presence or absence
of small pits and read out by an optical, non-contact pickup.
Recordable Mini Disc
This MD is a magneto-optical disc which can be recorded by magnetic field modulation. To record signals, laser light is
irradiated from the bottom side of the magneto-optical disc and magnetic field is applied from the upper side of it.

Kenwood DM-SG7 Specifications

System and Audio

system	Minidisc digital audio system
laser	Semiconductor laser
recording method	Field modulation overwrite method
audio compression	ATRAC (Adaptive TRansform Acoustic Coding)
playing rotation	Approx. 400 rpm ~ 900 rpm (CLV)
D/A conversion	1 Bit
oversampling	128 fs (5644.8 kHz)
A/D conversion method	Sigma-delta method
sampling frequency	44.1 kHz

Digital Audio Performance

frequency response (playback mode)	8 Hz ~ 20 kHz, ± 1 dB
signal to noise ratio (playback mode)	More than 92 dB
dynamic range (playback mode)	More than 90 dB
total harmonic distortion (1 kHz, playback mode)	Less than 0.007 %
channel separation (1 kHz, playback mode)	More than 85 dB
wow & flutter	Less than unmeasurable limit

Inputs and Outputs

analog input sensitivity / input impedance	300 mV / 70 kΩ
analog output level / load impedance	1.2 V / 3.2 kΩ
digital input, optical (wave length 660 nm)	- 15 dBm ~ - 21 dBm

General Specifications

power consumption	14 W
dimensions (width)	200 mm (7 - 7 / 8")
dimensions (height)	77 mm (3 - 1 / 16")
dimensions (depth)	247 mm (9 - 3 / 4")
weight (net)	2.1 kg (4.6 lb)