American Audio HD88CC5 Spezifikationen Seite 12

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1. Automatic Gain Control (AGC):
A Xantech IR receiver constantly studies the ambient light level in the environment, and automatically (and
rapidly) re-calibrates its own sensitivity so it can more accurately select between the wanted remote IR signals
and unwanted noise from sources such as TV’s, interior lighting, and even the sun. The effect is
similar to putting-on quality sunglasses to be able to see detail and contrast even in bright sunlight.
2. Adaptive Filtering circuitry:
Xantech has extensively analyzed the IR characteristics of the vast majority of consumer electronics product
types, which shows that nearly all of them operate using a carrier frequency between the 25 kHz and 60 kHz
range. Frequencies above 60 kHz consist mostly of random noise generated by CFL lighting as well as LCD
and plasma displays. Through this exhaustive and on-going research, Xantech is able to build-in an intel-
ligent, accurate, and effective filtering mechanism which enables a Xantech receiver to more electively “look”
at an IR source while rejecting those frequencies without any useful information.
Original Signal
From Remote
Signal Degraded
Over Distance, and
by Noise From
Ambient Lighting
Signal Restored
by Error
Correction
ERROR CORRECTION
Normal Ambient
Lighting & Remote
Control Signal
External Lens
(First Stage Optical
Filter) Removes
Sunlight and Powerful
Interference
Most Visible
Light
Removed
IR Sensor Lens
(Second Stage
Internal Optical Filter)
Ensures IR Receiver
Only “Sees” Infra-red
Radiation
Mostly Infrared
Light to Photo
Diode
IR Receiver
Element
Ultraviolet
Light Spectrum
Infrared
DUAL LENS OPTICAL FILTER
NATIVE CARRIER
Original IR Signal
From Remote
(Carrier Frequency)
IR Sensor Strips
Out Carrier
Frequency
Final Output:
Reconstructed IR
Signal Not the Same
as Original
Signal with Carrier
Stripped Out
DIGITAL IR REPEATER
Simple Digital
Mixing Circuit
Attempts to
Reconstruct Original
Signal Manually
Simple
Digital
Mixer
Original IR Signal
From Remote
(Carrier Frequency)
Xantech IR Sensor
Signal Degrades Due To Ambient
Light and Distance
XANTECH IR REPEATER
IR Signal in Original
Form is Restored
Signal Degrades from Ambient
Light and Distance
Simple Analog
Amplifier Circuit
Boosts Noise Along
with Signal
Simple
Analog
Amplifier
Original IR Signal
From Remote
(Carrier Frequency)
IR Sensor Passes
Noise Along with
the Signal and
Carrier Frequency
Final Output:
Degraded Signal
with Noise
ANALOG IR REPEATER
ADAPTIVE FILTERING
AUTOMATIC GAIN CONTROL
Xantech
Advanced
Signal
Processor
Plasma TV
LCD TV
CFL Family
Incandescent Bulb
Sunlight
Plasma TV
LCD TV
CFL Family
Incandescent Bulb
Sunlight
0Hz 25kHz
Adaptive Filtering Range
60kHz
100kHz and Higher
IR Signal In Bright Ambient Lighting
Conditions and Interference
IR Signal In Bright Ambient Lighting
Conditions and Interference Adjusted
for Gain (Done Automatically
by AGC + Adaptive Filtering)
Xantech Digital
Error Correction
Circuit
36kHz 40kHz 56kHz 58kHz
CE Carrier Frequencies
3
6k
Hz
40
0k
Hz
C
CE C
Car
arrie
ier
r Fr
req
56
que
6kH
uenc
Hz
5
ncie
58
es
kH
z
Original Signal
From Remote
Signal Degraded
Over Distance, and
by Noise From
Ambient Lighting
Signal Restored
by Error
Correction
ERROR CORRECTION
Normal Ambient
Lighting & Remote
Control Signal
External Lens
(First Stage Optical
Filter) Removes
Sunlight and Powerful
Interference
Most Visible
Light
Removed
IR Sensor Lens
(Second Stage
Internal Optical Filter)
Ensures IR Receiver
Only “Sees” Infra-red
Radiation
Mostly Infrared
Light to Photo
Diode
IR Receiver
Element
Ultraviolet
Light Spectrum
Infrared
DUAL LENS OPTICAL FILTER
NATIVE CARRIER
Original IR Signal
From Remote
(Carrier Frequency)
IR Sensor Strips
Out Carrier
Frequency
Final Output:
Reconstructed IR
Signal Not the Same
as Original
Signal with Carrier
Stripped Out
DIGITAL IR REPEATER
Simple Digital
Mixing Circuit
Attempts to
Reconstruct Original
Signal Manually
Simple
Digital
Mixer
Original IR Signal
From Remote
(Carrier Frequency)
Xantech IR Sensor
Signal Degrades Due To Ambient
Light and Distance
XANTECH IR REPEATER
IR Signal in Original
Form is Restored
Signal Degrades from Ambient
Light and Distance
Simple Analog
Amplifier Circuit
Boosts Noise Along
with Signal
Simple
Analog
Amplifier
Original IR Signal
From Remote
(Carrier Frequency)
IR Sensor Passes
Noise Along with
the Signal and
Carrier Frequency
Final Output:
Degraded Signal
with Noise
ANALOG IR REPEATER
ADAPTIVE FILTERING
AUTOMATIC GAIN CONTROL
Xantech
Advanced
Signal
Processor
Plasma TV
LCD TV
CFL Family
Incandescent Bulb
Sunlight
Plasma TV
LCD TV
CFL Family
Incandescent Bulb
Sunlight
0Hz 25kHz
Adaptive Filtering Range
60kHz
100kHz and Higher
IR Signal In Bright Ambient Lighting
Conditions and Interference
IR Signal In Bright Ambient Lighting
Conditions and Interference Adjusted
for Gain (Done Automatically
by AGC + Adaptive Filtering)
Xantech Digital
Error Correction
Circuit
36kHz 40kHz 56kHz 58kHz
CE Carrier Frequencies
3
6k
Hz
40
0k
Hz
C
CE C
Car
arrie
ier
r Fr
req
56
que
6kH
uenc
Hz
5
ncie
58
es
kH
z
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