Sony RDR-GX7 - Manual (Page 28)

High-grade audio circuit design
for high sound quality
While video performance is extremely important for quality
playback, it's essential to offer the same high level of audio
performance. The RDR-GX7 has been designed for connection
to high quality amplifiers and speakers, and therefore its design
features high-grade audio circuitry, along with new recording
circuit technology to facilitate top quality performance, both as a
CD player and as a DVD player. In the RDR-GX7, the audio
circuitry has been created to assure complete satisfaction in
home theater use.
■ Newly developed audio-grade A/D converter
(pre-processing)
Analog audio signals input into the RDR-GX7 are converted to
digital signals for recording, hence an A/D converter is
necessary. For this purpose, a newly developed 96 kHz 24-bit
capable A/D converter is incorporated. Since it has an extra
margin of performance in terms of both the sampling frequency
and the quantization bits, high sound quality is maintained during
A/D conversion. In addition, in this A/D converter, the circuitry
for all input stages has been integrated onto a single IC chip.
Selector circuitry, as well as filter and gain adjustment circuitry,
which have conventionally been constructed with many different
components along the signal path, are now integrated into an IC,
enabling direct input of the audio signal. This approach reduces
any negative effects on the audio signal caused by noise
generated in the digital and control sections, resulting in accurate
A/D conversion.
■ 192 kHz 24-bit high performance D/A converter
(post-processing)
A high performance audio output D/A converter has been
employed which offers 192 kHz, 24-bit performance. This high
quality converter ensures excellent reproduction of DVD-Video
soundtracks and audio Compact Discs.
■ High Grade Audio Circuitry for Superior Sound Quality
(post-processing)
The analog output of the audio D/A converter is handled as a
balanced signal in order to minimize the effects of external noise
on the signal, which is sent to the signal amplifier. In addition,
the signal amplifier employs a plus-minus power supply for
greater dynamic range capability.
■ Wide bandwidth optical output terminal
(post-processing)
The RDR-GX7 features two different types of digital outputs, a
conventional coaxial output and an optical output, both of which
feature extremely wide bandwidth characteristics. Since the
optical output is capable of transmission speeds of up to 13.2
Mbps, signal jitter (time axis fluctuations)
is minimized, assuring higher sound
quality compared with connections to
conventional optical outputs when
connection is made through this terminal.
■ Television Virtual Surround (TVS)
(post-processing)
Using the surround track recorded on DVD-Video software,
virtual multi-speaker reproduction is possible through connection
to existing television stereo speakers. This function makes it easy
to enjoy a soundfield with remarkable presence. Fine sound
tuning, such as increasing the level of the “virtual” center
channel to reproduce the dialog more clearly, can be easily
performed. In addition, four different sound modes (dynamic /
wide / night / standard) may be selected to optimize sound
reproduction for the software or the listening environment.
Chapter 4-4
High quality
image & sound
RDR-GX7 Technical Notes
28
Ordinary components
RDR-GX7
Audio In
NEW
Audio In
SELECTOR
FILTER/GAIN
A/D CONVERTER
A/D CONVERTER
VR VIDEO
The new A/D converter
The Newly Developed 96 kHz 24-bit Capable
A/D Converter
Coaxial and optical
digital audio outputs