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Ultrasonic Audio Recorder

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Description

This microphone system records more than just ordinary sound. It also records extremely high frequencies that your ear could never hear.

When the recordings are played back at a very slow speed, these ultrasonic frequencies become audible - revealing sounds you never knew existed!

Most sound recorders have a sample rate of 44.1kHz. This one has a sample rate of 1MHz (over 20 times higher).


Applications 

  • Combined with high-speed (slow-motion) video cameras: Add incredibly detailed sound. A drop of water might sound like a tidal wave. A glass breaking might sound like a building crumbling. Lots to be discovered.
  • Biologists could learn more about the communication sounds made by insects, rodents, and birds.
  • When used with real-time digital signal processing, could give new possibilities to sensor technology.

Short-term goals

- Find suitable components:
    - 1MHz 16-bit analog-to-digital converter
    - microphone that can respond to high ultrasonic freqencies
    - flash memory, several hundred megabytes at least
    - USB or some other connection

- Assemble a prototype

- Write a simple program to make it easier to locate sounds (based on amplitude level) in a long recording.

- Potential additional features
   - built-in lossy audio data compression
   - automatic start and stop of recording based on audio levels

Long-term goals

- Develop a compact stereo version
    - two microphones spaced a certain distance apart

Milestones

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Participants

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Incentives

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See SENSORICA Business Model and Contribution Accounting System.

Tools, activities, and processes

The basic design of the electronic information flow is: microphone -> anti-aliasing filter -> analog-to-digital converter -> FIFO circular buffer -> flash memory

The flash memory could be a memory card or a USB stick. The data must be able to be retrieved later by a computer.




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Skills and resources needed

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Contact us if you want to contribute!

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Contribution accounting:
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Database: 
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Status

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