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PDF SA3286 Data sheet ( Hoja de datos )
| Número de pieza | SA3286 | |
| Descripción | Pre-configured DSP System | |
| Fabricantes | ON Semiconductor | |
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INSPIRIA SA3286
Pre-configured DSP System
for Hearing Aids
INSPIRIA SA3286 features iSceneDetect t environmental
classification, 128−bands of noise reduction, superior feedback
cancellation and built−in feedback path measurement capabilities.
The iSceneDetect Environment Classification algorithm automatically
senses the hearing aid wearer’s environment and dynamically adjusts
hearing enhancement algorithms (such as Feedback cancellation, noise
reduction, compression, etc.) without user involvement.
Environment classification on Inspiria SA3286 enables programming
of hearing aid to a single program setting which can be employed by the
hearing−aid wearer in all environments instead of manually changing to
a different memory with a change in the acoustic environment.
The Inspiria SA3286 comes with EVOKEt advanced acoustic
indicators. EVOKE allows manufacturers to provide more complex,
multi−frequency tones which can simulate musical notes or chords.
The Inspiria SA3286 iLogt 2.0 Datalogging feature records various
parameters every 4 seconds to 60 minutes (programmable) during use of
the device. Once these parameter values are read from the device, they
can be used to counsel the hearing aid wearer and fine tune the fitting.
The Inspiria SA3286’s Adaptive Noise Reduction monitors noise
levels independently in 128 individual bands and employs advanced
psychoacoustic models to provide user comfort.
Based on a phase cancellation method, Inspiria SA3286’s adaptive
feedback reduction algorithm provides an increase in added stable
gain. It features rapid adjustment for dynamic feedback situations and
resistance to tonal inputs.
Automatic Adaptive Directional Microphone (ADM) algorithm
from ON Semiconductor automatically reduces the level of sound
sources that originate from behind or the side of the hearing−aid
wearer without affecting sounds from the front by adjusting the null in
the microphone polar pattern to minimize the noise level at the output
of the ADM. To reduce current consumption, the algorithm can switch
automatically between 1 mic omni and ADM depending on the
acoustic environment.
The Inspiria SA3286 is equipped with a noise source that can be
used in treating tinnitus. The Tinnitus Treatment noise can be shaped
and attenuated and then summed into the audio path either before or
after the volume control.
The Narrow−band Noise Stimulus feature allows the user to generate
stimuli from the device that can be used for in situ audiometry.
In addition to these adaptive algorithms, the Inspiria SA3286 also
supports the following features: up to 8 channel WDRC,
FRONTWAVE® directional processing, cross fading between audio
paths for click−free memory changes, 16−band graphic equalizer, 8
generic biquad filters (configurable as parametric or other filter types),
programming speed enhancements, optional peak clipping, flexible
compression adjustments, volume control, rocker switch, and
industry−leading security features to avoid cloning and software piracy.
www.onsemi.com
16 PAD
HYBRID
CASE TBD
FMIC
RMIC
VC
SDA
GND
PGND
PAD CONNECTION
MGND
15 16
1
14 2
13 3
12
4
11
5
10
6
VREG
TIN
DAI
MS
MS2
VB
98
7
OUT+ OUT−
(Bottom View)
VBP
MARKING DIAGRAM
SA3286−E1
XXXXXX
SA3286 = Specific Device Code
E1 = RoHS Compliant Hybrid
XXXXXX = Work Order Number
ORDERING INFORMATION
See detailed ordering and shipping information on page 14 of
this data sheet.
© Semiconductor Components Industries, LLC, 2015
July, 2015 − Rev. 2
1
Publication Order Number:
SA3286/D
1 page  
INSPIRIA SA3286
TYPICAL APPLICATIONS
VB
1
Voltage
Regulator
15 A/D
3k9
3k9
1k
1k
14
2
3
16
M
U
X
A/D
MIC/
TCOIL
Comp
Programming
12 Interface
Clock
Generator
54
6
Memory
Select
Adaptive
Directional
Microphone
or
FrontWave
*
**
Post
Biquad
Filters
Feedback
Canceller
AGCO
Acoustic
Indicators
POR
Circuitry
Σ Cross
Peak
D/A
Fader
Clipper
HBridge
Noise Generator
and Shaper
Volume
Control
Σ
Wide−
band
Gain
Control
A/D
Pre
Biquad
Filters
Environmental
Classification
Post
Biquad
Filters
7
8
9
10
13
Frequency
Band
Analysis
128 bands
Frequency
Band
Synthesis
Data
Logging
OUT
LP
Filter
200 k
WDRC (1,2,4,6 or 8 channels)
Noise Reduction (128 bands)
Graphic EQ (16 bands)
EEPROM
* If Input Mode = 1 mic omni, mic + telecoil, mic + DAI
** If Input Mode = 2 mic omni, rear only, directional
11
Figure 2. Test Circuit
VB
1
Voltage
Regulator
15
14
M
2U
X
3
A/D
A/D
MIC/
TCOIL
Comp
16
12
Programming
Interface
Clock
Generator
54
6
Memory
Select
Adaptive
Directional
Microphone
or
FrontWave
*
**
Post
Biquad
Filters
Feedback
Canceller
AGCO
Acoustic
Indicators
S Cross
Fader
POR
Circuitry
Peak
Clipper
D/A
HBridge
Noise Generator
and Shaper
Volume
Control
S
Wide−
band
Gain
Control
A/D
Pre
Biquad
Filters
Environmental
Classification
Post
Biquad
Filters
Knowles or
Microtronic
7 zero−bias
receiver
8
9
10
13
Frequency
Band
Analysis
128 bands
Frequency
Band
Synthesis
Data
Logging
WDRC (1,2,4,6 or 8 channels)
Noise Reduction (128 bands)
Graphic EQ (16 bands)
EEPROM
* If Input Mode = 1 mic omni, mic + telecoil, mic + DAI
** If Input Mode = 2 mic omni, rear only, directional
11
Figure 3. Typical Application Circuit
www.onsemi.com
5
5 Page 
INSPIRIA SA3286
Biquad Filters
Additional frequency shaping can be achieved by
configuring generic biquad filters. The transfer function for
each of the biquad filters is as follows:
H(z)
+
b0 ) b1
1 ) a1
z−1 ) b2
z−1 ) a2
z−2
z−2
Note that the a0 coefficient is hard−wired to always be ‘1’.
The coefficients are each 16 bits in length and include one
sign bit, one bit to the left of the decimal point, and 14 bits
to the right of the decimal point. Thus, before quantization,
the floating−point coefficients must be in the range −2.0 ≤ x
< 2.0 and quantized with the function:
round ǒx 214Ǔ
After designing a filter, the quantized coefficients can be
entered into the PreBiquads or PostBiquads tab in the
Interactive Data Sheet. The coefficients b0, b1, b2, a1, and
a2 are as defined in the transfer function above. The
parameters meta0 and meta1 do not have any effect on the
signal processing, but can be used to store additional
information related to the associated biquad.
The underlying code in the product components
automatically checks all of the filters in the system for
stability (i.e., the poles have to be within the unit circle)
before updating the graphs on the screen or programming
the coefficients into the hybrid. If the Interactive Data Sheet
receives an exception from the underlying stability checking
code, it automatically disables the biquad being modified
and display a warning message. When the filter is made
stable again, it can be re−enabled.
Also note that in some configurations, some of these
filters may be used by the product component for
microphone/telecoil compensation, low−frequency EQ, etc.
If this is the case, the coefficients entered by the user into
IDS are ignored and the filter designed by the software is
programmed instead. For more information on filter design
refer to the Biquad Filters In PARAGON Digital Hybrid
information note.
Rocker Switch
The Inspiria SA3286 is equipped with a rocker switch
feature that can perform both volume control (VC)
adjustments or an audio memory switch.
There are 3 modes of operation:
• Digital VC
• Momentary Memory Select
• Mixed Mode
In Mixed Mode, the switches behaviour is configurable to
be set to that a short or long press of the switch will invoke
either a memory or VC change (i.e., a short press is a
memory select, a long press is a VC change).
There is a programmable threshold that can be used to set
the timing behaviour.
Volume Control
The Volume Control (VC) can be either external or
programmable. If external VC operation is selected, a
further decision is required as to whether a variable resistor
(analog VC) or a Digital Volume Control (DVC) will be
connected to the 9−bit A/D converter.
Analog Volume Control
The external VC can be configured to work with either a
two−terminal 200 kW variable resistor or a three−terminal
0.1 MW − 1 MW variable resistor. In two−terminal
configuration, the VC is connected between GND and the
VC input. In three−terminal configuration, it is connected
between GND, Vreg and the VC input.
If using a two−terminal VC, it must be calibrated before
use. Calibration is not necessary with a three−terminal
connection. Hysteresis is built into the VC circuitry to
prevent unintentional volume level toggling. A log taper
potentiometer is recommended so that gain in dB would be
linear with potentiometer rotation. The range of VC is
adjustable and can be set between 1 dB (min) and 42 dB
(max).
Digital Volume Control
If using a Digital Volume Control with the Inspiria
SA3286, a resistor must be connected between the VC input
and Vreg, and another resistor of the same value must be
connected between the VC input and GND. The values of
both resistors can be between 50 kW and 0.5 MW.
A toggle switch can be used as a DVC, momentarily
connecting the VC to either Vreg or GND. By connecting the
VC to Vreg, the volume will be increased one step, and by
connecting the VC to GND, the volume will be decreased
one step.
The following parameters can be programmed into the
hybrid to specify the DVC functionality:
• DVC enable or disable
• Volume up/down step size of 1 dB, 2 dB, 3 dB or 4 dB
• Volume up/down beep frequency and volume
• DVC range between 6 dB and 42 dB in 6 dB steps
• Default DVC value when the hybrid is powered up
• Volume up/down beep enable
• Max/Min beep enable
• Max/Min beep frequency & volume
If the Max/Min beep is enabled then when the volume has
been incremented to the maximum value of the specified
DVC range the device will play two beeps to indicate that it
cannot increase the volume any more. The same is true for
decrementing the volume and reaching the minimum value
of the DVC range.
www.onsemi.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet SA3286.PDF ] | |
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