
4
AV RECEIVERS REFERENCE GUIDE
Audio Technologies Video Technologies Audio Formats & Licenses
Sophisticated Surround System
Connectivity Network Features Advanced Control
Advanced Sound Retriever
Pioneer’s AV receivers feature the Advanced
Sound Retriever, which restores the output of
compressed audio — such as WMA, MPEG-4 AAC,
and MP3 — to the level of CD sound. The Advanced Sound
Retriever creates new signals to restore the minor details left
out during the compression process.
Multi-Channel Advanced Sound Retriever
Advanced Sound Retriever for multi-surround sound is
compatible with DVD soundtracks featuring Dolby Digital or
DTS.
Auto Sound Retriever
Since the Advanced Sound Retriever is designed
with an algorithm optimized to process 128 kbps
signal, it did not work well with 8-15 kHz high
frequencies in 64 kbps signal, which is the bit rate for quite a few
internet stations. The newly developed Auto Sound Retriever
automatically determines the audio signal’s bit rate, and
interpolates the data lost during compression. It is especially
effective for improving the sound quality of low bit-rate content
— an ideal feature when switching between internet radio
stations with different bit-rates.
Auto Sound Retriever for ARC
With digital broadcast, although images are displayed in high-
definition, the audio quality is not as high since they are
compressed with various bit rates. By applying Pioneer’s Auto
Sound Retriever feature to TV broadcast signals, it adjusts the
effects according to the bit rate transferred via HDMI’s ARC
(Audio Return Channel), letting you enjoy digital TV broadcast in
high-definition sound via Pioneer AV receiver.
Sound Retriever Link
Through HDMI connection, Sound Retriever Link
detects the original audio file information such as
source type, codec, and bit rate played on a
compatible Pioneer Blu-ray Disc player, and automatically
switches to the most suitable Sound Retriever. So there is no
need to switch on/off according to the source. Advanced Sound
Retriever is selected for Blu-ray Disc and DVD sources, and Auto
Sound Retriever is selected for other sources.
* Advanced Sound Retriever is selected for all sources when connected with
a non-compatible Blu-ray Disc player.
Sound Retriever AIR
When streaming music via Bluetooth, the sound
quality often suffers due to the compression
process. Pioneer’s Sound Retriever AIR is the
world’s first technology for improving the quality of Bluetooth
transmitted sound. It restores the music cadence lost through
compression, and also reduces the noise generated by
Bluetooth transmission for a better S/N ratio.
* Bluetooth connection by AS-BT100 or AS-BT200 adapter required
Time
Sound density
Sound density
Sound density
Sound pressure
Sound pressure
Sound pressure
Restoration of lost music cadence
Restoration of lost music cadence
CD sound
CD sound
Compressed
sound
Compressed
sound
Restored
sound
Restored
sound
Sound Retriever ON
Sound Retriever ON
FrequencyMiddleLow High FrequencyMiddleLow High FrequencyMiddleLow High
Time Time
Advanced Sound Retriever
Restoration Image
Advanced Sound Retriever ON
Advanced Sound Retriever OFF
Original Sound
Hz0 5k 10k 15k 20k
-140
dBrA
-120
-100
-80
-60
-40
-20
+0
Advanced Sound Retriever
Compensation Effect
MP3
64
5
10
15
20
25
96 128 160
Bit rate (kbps)
Upper frequency (khz)
192 256 320
WMA
AAC
Current Sound Retriever
unable to play 8-15 kHz
range for MP3's 64 kbps
Upper limit for
playback differs
by frequency
Current Sound Retriever
optimized for
128 kbps bit rate
Playback Upper Limit Frequency by Bit Rate
Auto Sound Retriever
Compressed Sound Restored Sound
Sound Retriever AIR OFF Sound Retriever AIR ON
-80
-100
db
-120
1k 20k
14.5dB
: OFF
: ON
Hz
Improvement for S/N Ratio
1122 922
1122 922
1122 922
1122 922
1122 922 827 822
1122 922 827 822 522 322