Kenwood DM-SG7 User Manual

DM-SG7(EN)
28
Recording (digital input)
Digital recording on a Mini disc is not possible under the following conditions.
1 In case the source contains the copy prohibit code (SCMS – Serial Copy Management System).
— “SCMS ON” is displayed and the unit enters the record-pause mode.
2 Locking to the reference clock is not possible. — “UNLOCK” is displayed and Pause status is engaged.
Sampling frequency
Three types of digital signals are usually used according to the sampling frequencies. The sampling
frequencies vary depending on the types of digital equipment as shown below.
32 kHz : Standard and long-hour modes of DAT, A mode broadcasting of BS tuner, etc.
44.1 kHz : Standard mode of DAT, CD, MD, etc.
48 kHz : Standard mode of DAT, B mode broadcasting of BS tuner, etc.
(DAT : Digital Audio Tape deck)
In general, high-quality recording based on digital signal transmission is not possible unless the source
and recorder components use the same sampling frequency. As this unit has a built-in sampling rate
converter, digital signals with 32 kHz and 48 kHz can be recorded by conversion to the MD sampling
frequency (44.1 kHz).
Digital recording and SCMS
SCMS (Serial Copy Management System)
Designed for copyright protection, the SCMS is a prescription that copying of digital signals as they are in the
digital form between digital audio equipment is allowable only for one generation.
Copy using
digital input
Copy using
digital input
Copy using
analog input
Digital copy cannot
be repeated.
Copy using
analog input
Copy using
analog input
Copy using
digital input
Copy using
digital input

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)