fm

type Demodulator struct {
	// contains filtered or unexported fields
}

type DemodulatorConfig struct {
	// Center frequency of the signal in the IQ data.
	CenterFrequency rf.Hz

	// Deviation is the maximum difference between modulated and carrier
	// frequencies. This is half of the total bandwidth.
	Deviation rf.Hz

	// Downsample will define rate to downsample the samples to bring it to
	// a sensible audio sample rate.
	Downsample uint

	// Planner will be used to perform the FFTs used to filter the FM signal.
	Planner fft.Planner
}

type Modulator struct {
	// Config
	Config ModulatorConfig
	// contains filtered or unexported fields
}

type ModulatorConfig struct {
	// AudioSampleRate is the number of audio samples per second.
	AudioSampleRate uint

	// IqBufferLength is the amount of data to allocate to process incoming
	// Audio data.
	IqBufferLength uint

	// IqSamplesPerAudioSample controls how many Iq samples need to be generated
	// for each Audio sample that comes in.
	//
	// If the input AudioSampleRate is 44,100, and the IqSamplesPerAudioSample is
	// 10, the output SampleRate of the sdr.Reader will be 441,000.
	IqSamplesPerAudioSample uint

	// CarrierFrequency controls the frequency of the carrier that will be
	// modulated by incoming data.
	CarrierFrequency rf.Hz

	// Beta controls the deviation from the carrier based on the modulating
	// frequency.
	//
	// This value can get weird. If you want to estimate one, pick some values,
	// plug it into EstimateBeta, and go with it.
	Beta float64

	// Dest is where to send IQ samples to as audio data is written to the
	// Modulator.
	Dest sdr.Writer
}

type Reader interface {
	Read([]float32) (int, error)
}