BL-21994-000 Knowles Acoustics, BL-21994-000 Datasheet - Page 25

• Manufacturer Part Number: BL-21994-000
• Description: MIC ASSY PIEZO INSTR W/38" CABLE
• Manufacturer: Knowles Acoustics
• Series: BLr
• Type: Piezo Condenserr

Specifications of BL-21994-000

• Sensitivity: -69dB ±3dB
• Voltage - Rated: 3V
• Current: 160µA
• Size / Dimension: Circular - 12.7mm Dia x 25.4mm H
• Impedance: 4K Ohm
• Frequency: 20Hz ~ 10kHz
• Termination: Wire Leads
• Direction: Omnidirectional
• Port Location: Top
• Diameter: 12.7 mm
• Transducer Function: Microphone
• Device Type: Microphone
• Directivity: Omni
• External Diameter: 12.7mm
• Output Impedance: 4000ohm
• Length: 25.4mm
• Outer Diameter: 12.7mm
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Filter Type: -
• S/n Ratio: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 423-1002; BL-1994; BL-21994; BL1994

FEATURES
INTELLISONIC
The intelligibility and use of mobile communications
are often impeded by the impact of noise from the
immediate environment. IntelliSonic is a software-based
speech enhancement technology that when coupled
with Knowles’ microphones, reduces the effects of
reverberation, directionally interfering speech,
background noise and annoying acoustic echo.
COMPLETE SOLUTION
When you consider the interdependency of microphone design, acoustic porting, and sound signal conditioning, it's easy to see why Knowles
Acoustics has taken an integrated approach to your acoustic system needs.
• Noise suppression 16 dB
• Interference cancellation via beam-forming array 30dB
• Acoustic echo cancellation 27dB
• Speech bandwidth 8kHz
APPLICATIONS
Platforms such as tablets, laptops, ultra-mobile personal computers (UPCs), and other mobile computing devices have a number of applications that
would benefit from IntelliSonic to enhance the user experience and final product perception.
• VoIP Telephony
• Command and Control
• Voice recognition
• Dictation
PRODUCT MATRIX
LICENSING
A license per end user copy is recommended. This allows access to continued improvements and new releases. The license fee is dependent upon
volumes and product platforms.
SUPPORTED PLATFORMS
• Operating System: Windows
Product Code
DX01
DX02
DXEC01
DXEC02
# of Microphones
™
®
1
2
1
2
XP/2000 (supports AC’97 and HDAudio), Windows CE
– Integrated Systems
MICROPHONES TECHNOLOGY
• Language Translation
• Voice Annotation
• Audio Note Taking
Noise Reduction
✓
✓
✓
✓
• Adjustable acceptance and look angles
• Fully adaptive system adapts to changing
• Upper filter driver adherent to Microsoft’s windows
acoustic environment
driver model (WDM)
Acoustic Array
www.knowles.com
✓
✓
–
–
ACOUSTIC PORTING
Echo Cancellation
✓
✓
–
–
INTELLISONIC SOFTWARE
Unprocessed
IntelliSonic
• Rich application programming interface (API) set
• Real-time processing
• Low speech distortion
Signal
ACOUSTIC SOFTWARE
Using
™
(Visual output of recordings using same microphone)
IntelliSonic
Note: All performance curves are typical
™
Attenuates Unwanted Sounds
25