Lmst

(1/2)
I found a nice improvement to the Constant-Q Sliding DFT¹.

Using single precision calculation (32-bit float) generates some remanent noise because of the recursive nature of the algorithm: a running sum combined with complex rotations.

Replacing the complex multiply in eq. 3 for the twiddle factors (outer exponential) with the Martin Vicanek’s quadrature oscillator² helps a lot in the low frequencies. About 30 dB of improvement here, almost no extra CPU cost.

¹ A transform turning a PCM signal into a frequency spectrum. https://www.dafx.de/paper-archive/details.php?id=QMFQa1rIAM7mwu9tMIZAlg

² https://vicanek.de/articles/QuadOsc.pdf

#audio #DSP #SignalProcessing #CQSDFT #DFT #Spectrogram

Spectrogram obtained with a standard Constant-Q Sliding Discrete Fourier Transform.
Horizontally: time (10 s).
Vertically: frequency, logarithmically spaced, from 20 Hz at the bottom to 20 kHz at the top, for a sampling rate of 44.1 kHz.
Luminance: 0.5 dB per 8-bit step.
The CQSDFT here is the Hann window version, Q = 74 (very high).

Spectrogram obtained with the modified Constant-Q Sliding Discrete Fourier Transform (oscillator but no correction).
Horizontally: time (10 s).
Vertically: frequency, logarithmically spaced, from 20 Hz at the bottom to 20 kHz at the top, for a sampling rate of 44.1 kHz.
Luminance: 0.5 dB per 8-bit step.
The CQSDFT here is the Hann window version, Q = 74 (very high).

https://www.spectraplus.com/DT_help/overlap_percentage.htm

#overlap #FFT #Spectrogram #DSP

Concept 01.08 - Audible Images

Dartmouth, NS
December 2025

#spectrogram #experimentalart #bw #abstract #abstractphotos #photography #photos

https://tfd.sourceforge.net/

#Octave #Analysis #Spectrogram

More #AirWindowsConsolidated enthiusiasm from me. If you look closely at this #Spectrogram for a heavily distorted #808Bass you can see that the tone shaping is unique on each note (note the pattern of light and dark regions near the smeared main tones).
#FOSS #LinuxAudio

A spectrogram of a bass line where there appears to be pseudo-randomness that makes each note have unique character and tone.

#LinuxAudio explorations - in my careful delving into #AirWindowsConsolidated I am finding that I really want a #Spectrogram to refer to so I can see the spectral changes that these different plugins bring to sound.

#ToneBoosters Spectrogram plugin works pretty well - once you set it up properly. May suggest to you that the first thing you do is to head to Settings in the upper right corner (not the lower left Settings) and scroll all the way down the list of options which are shown and enable GPU acceleration. When this is off on my PC it is virtually unusable. When on, it is smooth and easy to work with.

Thanks @linuxdaw for having a solution easy to hand!
https://linuxdaw.org/?q=Spectrogram&d=Toneboosters

Visu by Tritik @tritik — FREE spectrogram plugin 📊🎧

Explore your sound visually w/ freeze, PNG export, hi-res support & FFT controls
Free version fully usable (black & white) — 40+ color maps via license
macOS & Windows (VST3, AU, AAX)
🔗 https://www.tritik.com/product/visu

#spectrogram #audiotools #freeplugin #sounddesign #LegalVST
More freeware & sales 👉 https://linktr.ee/legalvst

Visually-guided compensation of deafening-induced song deterioration https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2025.1521407/full We "trained deafened birds in a behavioral task where the #spectrogram divergence score of a target syllable was computed in real-time, triggering a contingent visual stimulus based on the score"; #crossmodal #BCI #neuroscience

Spectrogram divergence software on GitHub at https://gitlab.switch.ch/hahnloser-songbird/published-code/SpectrogramDivergence

A behavioral task to counteract deafening induced song degradation.

Pulses looking like gel electrophoresis #audio #dsp #spectrogram

I love using spectral analysis in my vocal coaching and analyzing my own progress over time really helps to stick to my own vocal development. Here you can see a student performing a twang exercise boosting frequencies in the 2-4 kHz area to boost clarity and to minimize the effort it takes to produce a more powerful sound without exhaustion.

#spectrogram #vocalcoach #Hamburg #music #singing #estillvoiceprint

spectrogram portraying a waveform and boosted frequencies in the area of 2-4 kHz

Spiral #audio #spectrogram by Oona Räisänen
youtube https://www.youtube.com/watch?v=VeC8TIu8c5M
https://www.windytan.com/2021/11/spiral-spectrograms-and-intonation.html

Available to try with mic input, or monitor of system audio playback if you select that as the input source
https://www.shadertoy.com/view/ftKGRc

Our Weekly Update #6 is live! 🎥✨

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#booze #alcohol #pubs #smarthome #simulator #spectrogram #browser #music #adventure #game #moon

there is much thankless dedication and love put into my work.

#audio #cleanup #spectrogram #composer

A screenshot showing Adobe Audition with an audio waveform spectrogram and various vertical lines representing clicking noises that need to be removed.

try #gramle and guess a #spectrogram today:

https://nascl.rc.nau.edu/gramle/

Dissonance!

Finishing my listen-through of the Tron:Legacy soundtrack and thought I had a digital hiccup... you know, you're listening to a stream and the song cuts out for a second or so... see the area indicated in the spectrogram.

Then I remembered it's on vinyl, on the turntable!

Well played #DaftPunk well played.

#NowPlaying #Vinyl #Records #Music #DaftPunk #TronLegacy #Soundtrack #AudioNerd #Spectrogram

A spectrogram displaying a gap in frequency information during the Tron: Legacy soundtrack playback.

It’s not every day you get a visual representation of “Wait, what just happened?” Now we know what digital déjà vu looks like.

Dissonance!

Finishing my listen-through of the Tron:Legacy soundtrack and thought I had a digital hiccup... you know, you're listening to a stream and the song cuts out for a second or so... see the area indicated in the spectrogram.

Then I remembered it's on vinyl, on the turntable!

Well played #DaftPunk well played.

#NowPlaying #Vinyl #Records #Music #DaftPunk #TronLegacy #Soundtrack #AudioNerd #Spectrogram

I'm running DIY spectrogram / waterfall plotter for 40m. Fun to see how the noise of sun turns into competition on CW band!

The plot is roughly from 13.00 UTC to 18.30 UTC.

#spectrogram #waterfall

Spent a few hours at the Seattle Pinball Museum today. A great time as always. I made another field recording, and noticed again this constant pair of lines on the spectrogram at around 15.5k and just under 16k. I wonder what causes it? https://soundcloud.com/matthew-m-conroy/seattle-pinball-museum-iii #fieldRecording #pinball #sound #spectrogram #spectrograph

A gray-scale spectrogram of a noisy pinball museum recording showing lines at around 15.5 khz and 16 khz.

This is another interesting piece of spectrogram I found. This is from the first track on my album, and shows a section that includes the Behringer Solina, an emulation of the string machine used so often by Jean-Michel Jarre. The slow wave of darkness across the top is the cancellation of frequencies caused by the Smallstone phaser effect.

#MusicProduction #BehindTheScenes #Spectrogram

Spectrogram in yellow on black colours, showing frequencies over time for my album track, "A Maze Of Twisty Little Passages". The top section, where the higher frequencies lie, has a slow sinusoidal pattern of darkness along it.

Here's another interesting one. You can see the kick descending in pitch on each beat, here. If you look really closely you might also be able to see gaps in the bass line either side of the kick, which is the sidechaining. Cool!

#spectrogram #MusicProduction

#spectrogram

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