User guide

DS1057F1 2
CS48LV13 Block Diagram
SoundClear Voice™ Features
• Flexible and tunable enabling freedom in product ID,
transducer placement and selection
• Robust proprietary algorithms assure consistent
performance across diverse sound environments and
off-axis
• Ambient-aware technologies constantly compensate for
changing noise types and level and varying product
positioning
• HD voice/wideband and narrowband support
• Supports handset, tablet, laptop, and speakerphone
single and multiple microphone configurations
• Conference room–grade AEC plus nonlinear residual
echo suppressor for superior full-duplex speakerphone
operation without echo
• Tx and Rx noise elimination
• Automatic volume control for both Tx and Rx
compensates variations in talker level, proximity, and
orientation
• Ambient-aware volume control compensates for variation
in Rx voice level and near-end noise level
• Tx and Rx comfort noise generators provide natural,
smooth transitions between single-talk Rx, single-talk Tx,
double-talk, and silent states
• Tx spectrally matched comfort-noise generator samples
and synthesizes ambient noise for more transparent talk
state transitions
• Tx and Rx parametric EQ simplifies carrier and industry
compliance, achieving natural sound and compensating
for transducer limitations
—Up to four concurrent Tx and four concurrent Rx filters
—Eight different filter types can be combined to achieve
exact requirements
—Each filter has tunable frequency, gain, and Q or
bandwidth
• Ambient-aware dynamic parametric EQ for Tx or Rx
enables automatic real time tuning for improved
intelligibility and to compensate for transducer
characteristics; responds to
—Tx or Rx stream amplitude
—Near-end ambient noise level
—User controls
• Rx compander for optimal speaker output level
• Mixed and mismatched microphone compensation
• Automatic calibration for up to ±6-dB sensitivity variation
• Compensation for microphone phase differences
Codec
Ho st
PGA
Noise
Reduction
Acoustic Echo Canceller
Residual Echo Suppressor
NLP
Spectrally Matched
Comfort Noise
Dynamic
FlexEQ
ALC
PGA
Codec Port
Host Port
Full-Duplex Control + Voice Activity Detection + Double-Talk Detection
PGA
Comfort
Noise
Automatic Volume
Control
Automatic Level
Control
Dynamic
FlexEQ
Noise
Reduction
PGA
GND V
D
V
L
BUSY PLL/ClkMgr
I
2
S
Raw
PCM
I
2
S
Clean
PCM
I
2
S
Clean
PCM
I
2
S
Raw
PCM
Near
End
Far
End
Advanced Media Processor
SoundClear ASR Enhance™
SPI/I
2
C
RESET
Optional Voice Processing Features
Optional Postprocessing Features
Voice Activity
Detector
SoundClear
ASR Enhance™
Sensory Inc.
TrulyHandsfree™ Voice Control
Dolby Laboratories, Inc. Audio Postprocessing Algorithms
DTS, Inc. Audio Postprocessing Algorithms