Microphone & Cymatics
Use the microphone or a recording to excite a simulated circular plate and observe frequency-dependent nodal patterns. The excitation position can be moved across the plate.
PICALLW · ANDROID · SOUND RESEARCH
PICALLW Voice Studio
Cymatics, voice analysis and acoustic experimentation in one Android environment.
Voice Studio combines a physically inspired vibrating-plate model, frequency generation, recordings and measurable acoustic voice features. It is designed as an experimental tool for observing sound — not as a medical diagnostic system.
Public APK releases are published only on the official PICALLW Downloads page.
ONE APP · FOUR WORK AREAS
From a sound source to a measurable signal and a visual model.
The four main tabs separate live sound, generated signals, recordings and deeper acoustic analysis. The cymatics view is a model of a vibrating plate; the voice measurements come from the recorded audio signal.
Frequency Generator
Generate tones, explore calculated resonances, save favourite frequencies and compare the model response with the actual audible signal.
Recordings
Record, import, replay, loop, rename and manage audio samples. The same recording can be reused for visualisation and acoustic analysis.
Voice Lab
Analyse pitch and stability, spectrum, approximate formants and MFCC features, with research-oriented estimates such as HNR, jitter, shimmer and CPP.
CYMATICS MODEL
Visualising resonance without pretending the simulation is the physical plate.
The plate model uses geometry, material-related settings, physical size, thickness, damping, excitation position and a finite set of resonant modes. Sand-like particles are then moved by a simplified simulation to make nodal structures visible.
This distinction matters: the displayed pattern is a model response. It is useful for experimentation and education, but it is not a direct measurement of a real Chladni plate.
Plate geometrycircular / model settingsExcitationgenerator, microphone or recordingResonancecalculated modesParticlesvisual simulation
VOICE ANALYSIS
Measure features of the recording — then interpret cautiously.
Voice Studio can calculate signal level, fundamental frequency, pitch variability, spectral descriptors, approximate LPC formants and MFCC statistics. Several voice-quality measures are also included as research estimates.
F0median · mean · range · stabilityHNRharmonic/noise estimateJitter / shimmerframe-to-frame estimatesCPPresearch estimateSpectrumcentroid · rolloff · flatness · entropyMFCC13 coefficient summaries
Important: these measurements describe an audio signal. They do not by themselves diagnose disease, psychological state or a person's “energy”. Recording conditions and protocol strongly affect comparability.
MODEL SETTINGS
Change the plate before changing the story.
Diameter, thickness, damping, particle count and mobility affect the simulated response. Keeping these settings visible helps separate a model parameter from an observed property of the audio.
For repeatable voice work, the same principle applies: use the same microphone, distance, room, task and recording level whenever possible.
MEASUREMENT DISCIPLINEMEASURED CALCULATED MODELLED RESEARCH HYPOTHESIS
Measured, calculated, modelled and hypothesised are not the same thing.
Audio waveform
The microphone or imported file provides the actual sampled signal.
Acoustic features
F0, spectrum, MFCC and other metrics are derived mathematically from that signal.
Cymatics pattern
The plate response is simulated from selected geometry and physics parameters.
Relationships over time
Possible links with HRV, GDV or other measurements require a controlled protocol and independent validation.
PICALLW VOICE STUDIO
Android releases will be published on PICALLW Downloads.
Use the official download page for public builds and release files. The project page and technical article will be updated as the application evolves.