## Analysis Dialog

User's Guide > Dialog Reference > Analysis Dialog

### Parameters

Analysis Type
  The following analysis types can be chosen.
  - Spectrum: Normal amplitude spectrum (power spectrum).
  - Smoothed Spectrum: Smoothed spectrum by cepstrum liftering. Smaller value of lifter length generates smoother spectrum.
  - Phase: Phase spectrum.
  - Unwrapped Phase: Unwrapped phase spectrum. The phase spectrum is unwrapped so that the spectrum is continuous.
  - Group Delay: Group delay spectrum.
  - Cepstrum: Cepstrum.
  - Smoothed Group Delay: Smoothed group delay spectrum. The smaller lifter length makes the group delay spectrum smoother.
  - Time-Domain Group Delay: Inverse FFT of group delay spectrum.
Window Type
  The following types are supported.
  - Hamming: Hamming window.
  - Hanning: Hanning window.
  - Blackman: Blackman window.
  - Gauss: Gauss window.
Lifter Length
  Lifter length for cepstrum analysis. A small value makes the spectrum smoother. This value is valid when analysis type is ``Smoothed Spectrum'' or ``Smoothed Group Delay''.

### CQT Parameters

Settings for parameters of the CQT analysis. These settings are introduced in version 0.9.

Bins per octave for CQT
  The number of bins per octave in the CQT spectrum. The larger value makes frequency resolution of the CQT spectrum higher.
Minimum frequency for CQT
  The minimum frequency for the CQT spectrum. Although the smaller value makes frequency range for analysis wider, it makes the computation cost higher.
Use a minimum frequency based on musical note
  The internal value of the minimum frequency is determined based on the musical note which corresponds to pitch of the key of a piano. This setting is useful for analyzing music data.
Use ERB-based frequency warping
  The frequency axis of the resultant CQT spectrum is warped based on the ERB which simulates frequency resolution of he human auditory system.
Margin factor of block length
  The block length for the CQT spectrogram is determined by multiplying this value to the minimum required length of the analysis block. The lower value sometimes generates discontinuity especially for lower frequency region. Although the higher value relieves the generated discontinuity, it makes the computation cost higher. This item is only used for the CQT spectrogram.
Transition factor for block window
  In calculating the CQT spectrogram, this value determines the transition length of the window function for an analysis block whose left and right edges are multiplied by the window function with flat area in the center and transition area in the both edges. The reciprocal of this value corresponds to the propotion of the taper (transition) length to the whole window length. For example, the value of 4 makes the taper length 1/4 to the whole window length. This item is only used for the CQT spectrogram.

### Attribute

Always make a new window
  Always make a new window in analysis. The check is turned off, one window will be reused for one audio file.
Use a linear spectrum (not use decibel)
  Use a linear spectrum instead of a decibel spectrum.
Display a normalized spectrum
  Display a normalized spectrum. When the check is turned off, the spectrum will be calculated from the raw waveform value.
Normalization with a waveform's maximum
  Normalize spectrum with a waveform's maximum value.

User's Guide > Dialog Reference > Analysis Dialog

Last modified: "2025-04-12 18:52:08 hideki"