BelaSigna R262 Analog Demonstrator User's Guide

AND9111/D
BELASIGNA[ R262 Analog
Demonstrator User's Guide
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APPLICATION NOTE
• The 30−ball WLCSP version of BelaSigna R262
The BelaSigna R262 Analog Demonstrator
The BelaSigna R262 Analog Demonstrator is a
self−contained, battery−powered unit that can be used to
demonstrate and evaluate the performance of BelaSigna
R262.
(BR262W30A103E1G)
• Two MEMS microphones spaced 10 mm apart
(Knowles part number SPU0410HR5H−PB)
• An onboard 2.048 MHz oscillator
• A stereo (line−level) output jack
• Onboard, dual AAA batteries for extended battery life
Key Features
The Analog Demonstrator is shown in Figure 1 and
features:
• Compact form factor of only 51 mm x 24.5 mm x
20 mm
and portable use
• Onboard SPI EEPROM
Power Switch (SW1)
BelaSigna R262
Stereo Output
Jack (OUT)
Algorithm Select
(ALGO)
Dual MEMS
Microphones
Figure 1. BelaSigna R262 Analog Demonstrator
Connecting the Analog Demonstrator
to disconnect the AO1 signal from the ring terminal of the
3.5 mm stereo output jack.
Note: The analog output impedance is 3 kW and is
intended to drive a high−impedance (line−level) input, not
speakers nor headphones directly. Refer to the BelaSigna
R262 datasheet for information on output stage
characteristics.
The analog output signals AO0 and AO1 are available on
the stereo output jack labeled OUT. AO0 is connected to the
jack tip, AO1 is connected to the ring, and the sleeve is
connected to analog ground as shown in Figure 2.
If you are interested in using the analog demonstrator with
a mono recording device, simply remove the RING jumper
© Semiconductor Components Industries, LLC, 2012
November, 2012 − Rev. 0
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Publication Order Number:
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Figure 2. Analog Demonstrator Output Jack Pinout
Jumper Configuration
and a component placement diagram for the analog
demonstrator are provided in Appendix A.
There are three jumpers on the analog demonstrator: EE,
GND, and RING.
By default, all three jumpers should be shorted. Their
behavior is summarized in Table 1. Complete schematics
Table 1. ANALOG DEMONSTRATOR JUMPER CONFIGURATION
Default
Position
Jumper
Shorted
Open
EE
Boot the custom application contained in EEPROM
Boots the DSP to “I2C host boot” mode,
expecting an application to be downloaded
via I2C
Shorted
GND
Connects the ground pin of the CAA (I2C) connector to
ground
Lifts the ground pin of the CAA (I2C)
connector, avoiding a potential ground loop
when the output jack of the demonstrator is
connected to the same computer as the
CAA. If powering the demonstrator from the
CAA, ensure the output jack is connected
prior to removing the GND jumper.
Shorted
RING
Connects the second analog output of BelaSigna R262
(AO1) to the ring terminal of the 3.5 mm stereo (OUT) jack
Disconnects the ring terminal of the 3.5 mm
stereo (OUT) jack, which can be useful
when connecting to mono recording
equipment, or devices that bias the ring
terminal
Shorted
Visual Indicators
reduction performance in this mode is 10 to 20 dB SNR−I,
depending on the type of noise.
There are two LEDs on the analog demonstrator. The
green LED (D1) indicates that power is on. The blue LED
(D2) indicates when the analog demonstrator is in Active
Mode and is outputting processed audio. When the analog
demonstrator is in Bypass Mode D2 is off.
Close−Talk Mode
Close−talk mode aggressively filters noise and manages
gain to pick up speech within 5 to 10 cm from the
microphone array, effectively attenuating both speech and
noise that is farther away. This mode is suitable for mobile
handsets and radios where the speech source is very close to
the microphones and the noise level can be quite high; up to
90 dB SPL. Noise reduction performance in this mode
ranges from 20 to 30 dB SNR improvement (SNR−I),
depending on the type of noise.
Refer to the AND9109/D − BelaSigna R262 Getting
Started Guide for details on the different algorithm modes
and performance metrics.
Default Configuration
The analog demonstrator boots to a custom application
stored in an onboard SPI EEPROM. This custom application
is pre−configured to simultaneously output two different
noise reduction algorithm modes: near−talk on AO0 and
close−talk on AO1. The processed outputs from these two
modes are available as single−ended analog outputs on the
stereo output jack (OUT).
Near−Talk Mode
Near−talk mode features excellent noise reduction in
applications where the speech source is located slightly
further away from the microphones; typically 50 to 100 cm.
This mode is suitable for handsfree devices and performs
well in noise levels up to 70 dB SPL. Expected noise
Operating the Analog Demonstrator
There is a pushbutton on the demonstrator labeled ALGO
that provides the ability to switch between the two processed
algorithm outputs, and stereo bypass. Pressing and releasing
the button will toggle between Bypass Mode, and Active
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AND9111/D
RESET button. Either method will swap the channel routing
in Active mode, giving you access to the close−talk
processed output on the tip terminal of the stereo output jack.
To restore the analog demonstrator to its default channel
routing, ensure you are not holding down the ALGO button
and cycle the power to the device or press the RESET button.
(algorithms on) Mode. When the analog demonstrator is in
Active Mode and is outputting processed audio, the blue
LED (D2) will be on. When the analog demonstrator is in
Bypass Mode, D2 is off.
It is also possible to swap the stereo assignment of the two
processed channels in Active mode, using the ALGO button.
This is useful if you are interested in using the analog
demonstrator with a mono recording device, but would
prefer to record the processed signal on AO1 (close−talk),
which is normally routed to the ring terminal of the stereo
output jack. To swap the tip and ring of the stereo output
jack, power on or reset the device while holding down the
ALGO button. This can be accomplished by turning the
power off and on again using SW1 while holding the ALGO
button. Alternatively, this can also be achieved by holding
the ALGO button down while momentarily pressing the
Demonstrator Positioning
The speech source can come from any direction (normally
in front of the microphones), as long as it is within the
“working sphere” of the current algorithm mode. For
close−talk mode, the MRP should be located between 5 and
10 cm from the microphones.
For near−talk, the mouth reference point (MRP) should be
located between 50 and 100 cm from the microphones.
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AND9111/D
APPENDIX A
R3
10K
SW1
2
SCL
SDA
VCC
VCC
R6
560K
C13
56nF
L1
22uH
2
3
5
U3
LBI
LBO
SHDN
OUT
8
FB 1
NCP1410
C18
100nF
VBAT
4
1
Y1
VCC
EN
R8
390K
OUTPUT
GND
3
2
VBAT
2.048MHz
C15
150pF
CLK
C16
33uF
EXT_CLK
C17
100nF
R10
820
D1
Power Indicator
Figure 3. Schematic Sheet 1 of 2 − Power Supply and Clocking
VBAT
R4
10K
1
3
C12
33uF
R5
DNI
R7
330K
R9
220K
4
CAA
D3
+
GND1
C14
150nF
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1
2
3
4
GND
1
2
J1
3V
−
7
LX
REF
4
ref
GND
6
AND9111/D
EE
1
2
VBAT
6
SCK
1
CS
5
SI
SO 2
VBAT
R2
100
D2
GND2
VREG
ALGO
VREG
C6
1uF
VSSA
C1
1uF
C5
C7
C9
B8
A9
A7
G3
G1
E5
VBAT
DGND
U1
GPIO5
GPIO4
GPIO3
GPIO2
GPIO1
GPIO0
VREG
AI0
VDDA
C2
1uF
VDDD
VDDD
C3
1uF
DGND
BelaSigna R262
VSSA
VDDA
VBAT
AI1_LOUT
AI2
VDDA
C4
4.7uF
VSSA
VBAT
C5
1uF
DGND
C1
I2C_SCL
C3
I2C_SDA
F2
D4
E7
D6
A3
B2
DEBUG_TX
A1
DEBUG_RX
EXT_CLK
RCVR0P_AO0
RCVR0M_AO1
NRESET
EN_TEST
DGND
SCL
SDA
RING
1
2
EXT_CLK
C8
2.2uF
C10
2.2uF
RESET
2
3
1
OUT
Figure 4. Schematic Sheet 2 of 2 − BelaSigna R262
B4
VDDO
VREG
R1
10K
TP1
C7
10nF
VSSA
E1
C11
VBATRCVR
G9
100nF
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U2
3
WP
7
HOLD
VMIC
mic0
TP2
C9
VMIC
AI3_VMIC
DGND
5
CAT25640
VSSD
VSSA
mic1
10nF
E3
VSSA
DGND
CAP1
F8
B6
VDDD
CAP0
G7
MIC0
1
4
2
3
MIC1
1
4
2
3
VSSA
VSSA
VSSD
A5
G5
VDDA
VSSRCVR
E9
F6
VBAT
VSSA
F4
8
VCC
VSS
4
AND9111/D
Figure 5. BelaSigna R262 Component Placement
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