Read Sharp SM-SX1 (serv.man2) Service Manual online
SM-SX1H
– 4 –
OPERA
TION MANUAL
7
Digital Output T
erminal (OPTICAL)
Connect equipment using a square type
optical digital cable.
(OPTICAL)
78
9
LINE 1
LINE 2
SACD
LINE OUT
(COAXIAL)
DIGITAL 1
DIGITAL 2
DIGITAL OUT
(OPTICAL)
(OPTICAL)
RIGHT
+
-
RATED IMPEDANCE : 8
SPEAKERS
LEFT
+
-
6
5
5
Digital 1 Input T
erminal
(COAXIAL) *
Connect equipment using RCA coaxial
cable.
6
Digital 2 Input T
erminal
(OPTICAL) *
Connect equipment using the square type
optical digital cable.
This terminal send signals of the external
equipment connected to the DIGIT
AL
1 or 2
terminal.
*
For digital input to this product, use
equipment which adapts to the digital
audio interface.
(32kHz, 44.1kHz, 48kHz)
8
Speaker Output T
erminals
Plug the speaker cord in firmly and be care-
ful that the end of the cord does not touch
the next terminal or speaker cord, as this
could cause damage to the amplifier
.
Use a speaker system which has 50 W or
more rated power input and 8 ohms im-
pedance.
If
the volume is turned up too high with the
speakers of less than 8 ohms impedance con-
nected, the protection circuit of the amplifier
activates. Nothing is heard temporarily
.
9
AC Input Jack
Connect the power cord to the
AC INPUT
jack.
Speaker cord
Speakers
7th-order
(delta-sigma)
modulator
1-bit coding LSI
Fixed-voltage
high-speed
switching circuit
Low-pass
filter network
1-bit
control signals
Power amplifier switching
signal
Out- put
Fixed voltage
Analog signal
Multi-bit
digital signal
(32kHz, 44.1kHz, 48kHz)
1-bit signal
Over-
sampling
Direct input
(delta-sigma) dynamic feedback
This product uses 1-bit signals as control signals.
As a result, amplification which maintains a
1-bit signal performance is realized by switching the fixed-voltage power with precise quartz-
crystal accuracy
.
Adopting the concept of “
(delta-sigma) Dynamic Feedback”, this product enables stable am-
plification faithful to the original sound by sending back the power voltage fluctuations (which
af
fects the audio signal) to the “7th-order
(delta-sigma) modulator 1-bit coding LSI” which
corrects the 1-bit control signal in real time.
Sampling the input signal at a high-frequency approx. 2.8 MHz (64 fs), the
(delta-sigma)
modulation circuit yields a 1-bit signal stream which faithfully reproduces the original sound.
In this 7th-order
(delta-sigma) modulation block, the quantization noise is shifted to a
higher band to generate 1-bit signals which secure high signal to noise ratio in the playback
band.
Using these 1-bit signals as control signals, the fixed-voltage high-speed switching circuit is con-
trolled.
The signals abstracted from the switching circuit are sent to the low-pass filter network and
used to drive speakers.
This amplifier has no analog amplifier elements and can obtain speaker driving power by “creating
1-bit control signals through high-speed sampling” and “synchronized high-speed switching to the
sampling frequency”. In consequence, amplification with excellent movement and transient char-
acteristics is fulfilled.
1-bit amplification process
Click on the first or last page to see other SM-SX1 (serv.man2) service manuals if exist.