Jump to content

File:CQT-piano-chord.png

Page contents not supported in other languages.
This is a file from the Wikimedia Commons
From Wikipedia, the free encyclopedia

CQT-piano-chord.png (784 × 556 pixels, file size: 78 KB, MIME type: image/png)

Summary

Description
English: The result of a constant-Q transform applied to the waveform of a C major chord played on a piano. The x axis corresponds to frequency mapped to the standard pitch names (increasing from lower pitches on the left to higher frequencies on the right). The y axis is time, with the start of the piano chord happening at the bottom and the release happening at the top (approximately 8 seconds later)

The darker areas correspond to higher values of the constant Q transform. The peak values are vibrating frequencies of the strings. The leftmost 3 strongest peaks are at the fundamental frequencies of the notes of the C major chord (C, E, G). The the remaining peaks to the right of the fundamental frequencies are overtones.

Note that Brown-Puckette algorithm on the showcqt uses kernels derived directly from frequency domain, the bandwidth calculation is actually variable-Q, and showcqt uses linear/nth root amplitude scaling rather than logarithmic.
Date
Source Own work
Author Em3rgent0rdr

Licensing

I, the copyright holder of this work, hereby publish it under the following license:
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

Captions

Constant-Q transform of a C major chord played on a piano. Generated using ffmpeg filter: ffplay -f lavfi 'amovie=piano-C-major-chord.ogg, asplit [a][out1]; [a] showcqt=timeclamp=1.0,fcount=10 [out0]'

Items portrayed in this file

depicts

19 March 2022

image/png

7c07cf5c936be26505f28a40e01249568e741b9d

79,908 byte

556 pixel

784 pixel

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current04:48, 19 March 2022Thumbnail for version as of 04:48, 19 March 2022784 × 556 (78 KB)Em3rgent0rdrCross-wiki upload from en.wikipedia.org

The following 3 pages use this file:

Global file usage

The following other wikis use this file:

Metadata