https://github.com/hansemannn/ios-coremotion-fft

Calculate FFT values based on iOS CoreMotion accelerometer data
https://github.com/hansemannn/ios-coremotion-fft

accelerate-framework coremotion fft ios

Last synced: about 2 months ago
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Calculate FFT values based on iOS CoreMotion accelerometer data

• Host: GitHub
• URL: https://github.com/hansemannn/ios-coremotion-fft
• Owner: hansemannn
• License: mit
• Created: 2017-08-15T13:08:10.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2017-08-22T08:44:20.000Z (over 7 years ago)
• Last Synced: 2025-01-27T07:11:41.574Z (4 months ago)
• Topics: accelerate-framework, coremotion, fft, ios
• Language: Objective-C
• Size: 49.8 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# iOS CoreMotion FFT

Calculate FFT values based on iOS CoreMotion accelerometer data.

## Credits

Huge shout-out to [this StackOverflow](https://stackoverflow.com/questions/32840282/how-to-get-correct-mean-values-after-applying-fourier-transform-on-accelerometer/32843293) which provided the core-algorithm used to calculate FFT values.

## Usage

This is an example project containing the `FFTCalculator` library I wrote to wrap the FFT-functionality.

Here is an example usage (Obj-C):

```objc

#import "FFTCalculator.h"

- (void)viewDidLoad {

  [super viewDidLoad];

  // Initialize calculator with frame size

  FFTCalculator *fftCalculator = [[FFTCalculator alloc] initWithFrameSize:256];

  

  // Check if the CoreMotion sensor is available (= FFTCalculator is supported)

  if (![fftCalculator isSupported]) {

    NSLog(@"Error: FFTCalculator not supported due to device restrictions");

    NSLog("@Please run this project on the device to use the CoreMotion sensor.");

    return;

  }

  

  // Start updates

  [fftCalculator startUpdatesWithCalculationHandler:^(NSArray * _Nullable values, float mean, NSError * _Nullable error) {

    NSLog(@"\nFourier values: %@", values);

    NSLog(@"Fourier mean-value: %f", mean);

  }];

  // Stop updates

  [fftCalculator stopUpdates];

}

```

## Copyright

MIT

## Author

Hans Knöchel