Digital Filter - Pioneer SC-LX901 Product Reference Manual

Audio Technologies
Audio Scaler
LX901 LX801 LX701
Pioneer's Audio Scaler technology consists of Hi-bit32,
Up-Sampling, and Digital Filter. The Hi-bit32 Audio Processing
improves resolution and density, while the Up-Sampling reduces
noise. Then the Digital Filter creates soft, natural sound and
improves transient response and pre-echo effect. The three
features integrate to upscale all 2-channel audio content up to
176.4 kHz/192 kHz 32-bit playback—176.4 kHz/192 kHz 32-bit by
auto, and selectable from 176.4/192, 88.2/96, 44.1/48 kHz
frequency, 32/24-bit rate by manual setting—offering realistic
reproduction of the content. The features can be controlled on the
Sound Explorer screen of the iControlAV5 app.
Audio Scaler Upscaling
Input
2ch only
Auto Red
Manual Red + Blue
176.4 kHz/192 kHz
32-bit
176.4 kHz/192 kHz
16-bit/24-bit
88.2 kHz/96 kHz
32-bit
88.2 kHz/96 kHz
16-bit/24-bit
44.1 kHz/48 kHz
32-bit
44.1 kHz/48 kHz
16-bit/24-bit
Hi-bit32 Audio Processing
The technology works to create undistorted sound,
bringing out the best in the 32-bit DAC. The 32-bit
DAC hardware alone does not reproduce better
sound. Maximum performance is gained
by applying the Hi-bit32 processing to expand signal
resolution, creating more detailed, smooth sound,
closer to the original analogue signal. Hi-bit32 Audio
Processing also increases the sound pressure for a tactile listening
experience, and the more channels you have, the more impressive it
becomes. It is effective for multi-channel content on DVD/Blu-ray
Disc as well as CD audio, and works with any disc player.
Actual Effects
24-bit vs 32-bit signal wave form comparison
24-bit Processing
1
0
-1
0 2m 4m 6m 8m 10m 12m 14m
Time / s
Output
176.4 kHz/192 kHz
32-bit
SLOW
176.4 kHz/192 kHz
32-bit
SHARP
176.4 kHz/192 kHz
16-bit/24bit
SLOW
176.4 kHz/192 kHz
16-bit/24bit
SHARP
88.2 kHz/96 kHz
32-bit
SLOW
88.2 kHz/96 kHz
32-bit
SHARP
88.2 kHz/96 kHz
16-bit/24-bit
SLOW
88.2 kHz/96 kHz
16-bit/24-bit
SHARP
44.1 kHz/48 kHz
32-bit
SLOW
44.1 kHz/48 kHz
32-bit
SHARP
44.1 kHz/48 kHz
16-bit/24-bit
SLOW
44.1 kHz/48 kHz
16-bit/24-bit
SHARP
32-bit Extension Processing
1
0
-1
0 2m 4m 6m 8m 10m 12m 14m
Time / s
Up-Sampling (192 kHz/32-bit)
The Up-Sampling feature of the Audio Scaler upgrades the sound
with reduced noise, providing maximum quality audio playback of
up to 192 kHz/32-bit.
Effects of Bit Expansion Processing
24-bit Signals
24-bit DAC
24-bit sine wave
Close up
32-bit DAC
24-bit resolution
input signals
24-bit resolution
32-bit DAC +
Red: original analog signals (ideal)
Black: 24-bit digital signals (actual)
Bit expansion processing required to bring out the real
performance from 32-bit DAC.

Digital Filter

The digital filter lets you enjoy two types of sound
characters by switching the DAC—"Slow" for soft and
warm, and "Sharp" for solid and tight sound.
Slow
Slow
Sharp
Short
10
AV RECEIVERS REFERENCE GUIDE
24-bit resolution
Previous
32-bit resolution
DAC alone
makes no
difference
32-bit resolution
DAC + signal
processing
–> closer to
Hi-bit32
original signal
Digital Filter Slow
Sharp
Sharp
Short
Previous
(in red)