Howtosignalprocessing
- How do you interpret negative frequencies?
- Why negative frequencies are needed in the spectrum?
- Can we hear negative frequencies?
- Is IQ data in frequency domain?
How do you interpret negative frequencies?
Physical Meaning of Negative Frequency
Remembering that physically, sinusoids are waves, the sign of the frequency represents the direction of wave propagation. Simply put, negative frequencies represent forward traveling waves, while positive frequencies represent backward traveling waves.
Why negative frequencies are needed in the spectrum?
In real world, the negative frequency does not exists and the spectral content on negative frequencies must be added to the spectral content at the positive frequencies, to save energy. The concept of negative frequencies is used broad wide namely in this sense, in the connection with complex numbers.
Can we hear negative frequencies?
No. The frequency of a sound is the number of cycles per second. This can be so low as to beyond human hearing.
Is IQ data in frequency domain?
The IQ data can be in the time domain (time vs amplitude+phase) or, usually post processing with a transform be, in the frequency domain (frequency vs amplitude+phase).
