2. A practical DSP solution for mobile phone stereo sound recording

3. Alango Stereo Solution With 2 mic Scheme of Microphones Position In Mobile Phone 1 Microphone from the Right Side1 Microphone from the Left Side Left FieldRight Field Stereo Sensitivity Fields 2

4. Stereo Technology Diagram 2 mic recording Right Left ADM1 Right Channel Left Channel ADM2 Right 3 Left Alango processing Alango 2 microphone system for stereo audio recordings provides following benefits: True stereo, high quality sound recording Wind reduction

5. Alango Stereo Solution With 4 mic Front side Rear Side 2 front microphones2 rear microphones Alango 4 microphone system for stereo audio recordings provides 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 Alango 4 microphone system 4

6. Event Recording Left Channel Right Channel Stereo Sensitivity Area Illustration of Stereo Recording with 4 mic Sounds from Rear & Side directions Right Side Left Side Rear Side 5

7. 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 natural stereo sensation of incoming sounds Sounds from Rear& Side directions Recording Environment Alango processing

8. 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 7 2 phone mic (left, right), unprocessed Alango technology with 2 mic 1 song2 song Test Setup