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microSoundRecorder (microSR)

Description

The microSoundRecorder is aimed to provide a small system for environmental sound monitoring and for bio-acoustic sound recording to be used with Teensy 3.6 from PJRC

The microSoundRecorder supports

different audio interfaces that are build in into the Teensy

• ADC, ADC_Stereo
• I2S, I2S_32, I2S_QUAD, I2S_32_MONO
• I2S_TYMPAN
• I2S_TDM

The I2S_32 mode allows acquisition of two 24 bit MEMS microphones

The I2S_32_MONO mode allows acquisition of one 24 bit MEMS microphone, reducing also used disk space

The I2S_TYMPAN mode allows the high quality TYMPAN audio board https://tympan.org/ to be used as audio recorder

The I2S_TDM mode allows multiple digital(e.g. ICS43434 ) microphones be used in TDM mode.

All other interfaces are based on the standard PJRC Audio Library

The microSoundRecorder implements

• variable sampling frequency
• scheduled acquisition
• audio-triggered archiving
• single file / event archiving
• variable pre-trigger
• startup menu on demand
• logging of environmental data (temperature, pressure, humidity, lux)

The microSoundRecorder uses

• Audio Library from PJRC
• SdFat-V2 which is part of Teensyduino
• modified queue object from the Audio library
• modified I2S input object from the Audio library for 24 bit I2S acquisition

The sampling frequency of all supported devices can be modified. The modification is carried out during setup.