Pioneer ELITE Blu-ray Disc BDP-85FD Reference Manual page 7

Audio Features
Zero Signal Terminal
88FD 85FD
The Zero Signal Terminal is a Pioneer-original feature for the
specific use of audio and video quality tuning. The terminal only
connects to the Blu-ray Disc player's GND, and transmits neither
audio nor video signals, and just works as the reference (GND)
for tuning. By connecting the Zero Signal Terminal with an
unused audio/video input terminal of an input device such as an
AV receiver, the reference level (GND) of the audio/video signals
can be matched between the two devices, allowing a precise
and high-quality signal transmission.
Sending Side Receiving Side
Standard
Level
Precision Audio
88FD
Jitter which negatively affects sound quality occurs when
transmitting or processing digital signals. Precision Audio
drastically eliminates jitter in the analog audio output. At the
SABRE Reference DAC's input stage, by referring to the highly-
32
precise clock generated by the dedicated clock IC, the input
signal's phase between Lch and Rch is matched, generating
signals with ultra-low jitter. Then, with the high-precision
master clock for DAC, the SABRE
even more precise D/A conversion.
High-Precision Clock IC for Audio
PQLS Bit-stream
88FD 85FD
With the precision quartz controller on a compatible
AV receiver, Pioneer's Precision Quartz Lock System
(PQLS) eliminates distortion caused by timing errors.
It controls the amount of audio signals from the AV
receiver to the Blu-ray Disc player, giving the best
possible digital-to-analog conversion.
For PQLS to be effective, Control with HDMI needs to be on.
With "Zero Signal"
Compensates for gap in Compensates for gap in
standard level and noise standard level and noise
Reference DAC performs an
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ELITE BLU-RAY DISC PLAYERS REFERENCE GUIDE
Audio or video cable
(commercially available)
To unused audio or video input terminals
AV receiver etc.
Jitter Reduction by High-Precision Master Clock
Jitterless Transmission (PQLS)
Blu-ray Disc Player
Control Data
Transfer
Servo
HDMI
Circuit
Data
IN/OUT
Transfer
AUDIO DATA
A/V decoder
AUDIO CLOCK
CONTROL DATA
Audio signal with jitter
7
AV Receiver
PLL
HDMI Clocking
IN/OUT Crystal
DATA
DAC
MEMORY
Jitterless signal via PQLS