a practical dsp solution for mobile phone stereo sound recording
TRANSCRIPT
A practical DSP solution for mobile phone stereo sound recording
Alango Stereo Solution With 2 mic
Scheme of Microphones PositionIn Mobile Phone
1 Microphone from the Right Side1 Microphone from the Left Side
Left Field Right Field
Stereo Sensitivity Fields
2
Stereo Technology Diagram 2 mic recording
Right
Left
Left
ADM1Right Channel
Left Channel ADM2
Right
3
Right
Left
Alango processing
Alango 2 microphone system for stereo audio recordingsprovides following benefits:
• True stereo, high quality sound recording• Wind reduction
Alango Stereo Solution With 4 mic
Front side Rear Side
2 front microphones 2 rear microphones
Alango 4 microphone system for stereo audio recordingsprovides following benefits:
• True stereo, high quality sound recording• Attenuation of sounds outside the camera view• Attenuation of user’s voice from the recording• Wind reduction
Scheme of Alango4 microphone system
4
Event Recording
Left Channel Right Channel
Stereo Sensitivity Area
Illustration of Stereo Recording with 4 mic
Sounds from Rear & Side directionsSounds from Rear & Side directions
Right SideLeft Side
Rear Side 5
Stereo Technology Diagram With 4 mic
6
ADM1
ADM2
Right Channel
Left Channel
Right
Left
• Adaptive Directional Microphones (ADM) technology use signals from four omnidirectional microphones and according to phase difference, and programmed parameters system enhances sounds coming from left (left channel) or right (right channel) angular directions.
• Sounds coming from side and rear directions (including user’s voice) are attenuated.
Mobile phone sketch
Our system provides naturalstereo sensation of
incoming sounds
Sounds from Rear& Side directions
Sounds from Rear& Side directions
Recording Environment
Alango processing
Sony stereo microphone
Alango technology with 4 mic
Comparison of Stereo Sound Recordings
Stereo sound recordings from:
Enjoy the listening and feel the difference by pressing the buttons below
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2 phone mic (left, right), unprocessed
Alango technology with 2 mic
1 song 2 song
Test Setup