The Spectrum CHOP calculates the frequency spectrum of the input channels, or a portion of the channels. The spectrum can be manipulated and then converted back to get a filtered audio signal.
When converting a signal to its spectrum, two channels are created from the one containing the signal. One channel contains the magnitude of the frequency components, and the other contains the phase. The channels are named <channel name><suffix>, where <suffix> is the magnitude or phase suffix.
To determine the frequency that a given sample represents, use the formula:
- Freq = 2 x (sample#) x (Sample Rate) / (Channel Length)
Where 'Sample Rate' and 'Channel Length' both refer to the Spectrum CHOP's rate and length.
In order to convert back to a signal, both channels are required. The suffixes should be the same as those used in the previous Spectrum CHOP.
- To Frequency Spectrum - Calculate the frequency spectrum assuming input is a signal.
- From Frequency Spectrum - Reconstructs a signal assuming input is a a frequency spectrum.
Analyze Segment - If on, only a small segment of the channel is analyzed. If off, the spectrum is computed from the entire channel.
Unit Values -
- Relative to Start/End
- Relative to Current Frame
- Current Time Slice
Start / End - Determines the start and end points of the segment to be analyzed.
Magnitude Suffix - The string appended to the channel name when converting to a spectrum that identifies the channel as containing magnitudes.
Phase Suffix - Similar to Magnitude Suffix, but for phase channels.
Standard Options and Local Variables