©copyright Raimo Olavi Toivonen 1985-2021. All rights reserved. Last updated on Feb 3, 2021.

Home   Signal displays 1985-   FFT displays 1985-   Cepstrum displays 1983-   LPC displays 1992-   Auditory displays 1983-  Loudness displays 1995-   Loudness curves 1998-  Timbre spectrum 1983-  LTAS displays 1982-  Harmonic FFT displays 1989-  Waterfall displays 1983-  F0 displays 1983-  F0 histograms in semitone scale 1989-  Jitter/shimmer 1990-  Computer Voice Fields 1983-   FFT spectrogram displays 1985-  LPC spectrogram displays 1998-  Auditory spectrogram displays 1985-  Formant charts in Bark, ERB, mel, semitone and Hz scales 1988-   Synte 2 demo video speech on 8.8.1977 analyzed 2018-   Other links   Formant charts of world languages in Bark scale 2018-

Works   Works before ISA

ISA software


Amplitude envelope curve displays in dB scale

Signal x(n) = xa(nT), n=0...N-1, T is the sample period, xa = analog signal, amplitude envelope = 10log10(x(n)2), n=0...N-1. If xa is the voltage signal of the microphone, then xa(nT) = kPa(nT), where Pa is the pressure and k is the constant factor. SPLdb = 10log10((Σx(n)2)/N), n=0...N-1.

Over the years, I have coded as a DSP man speech analysis methods of the Intelligent Speech Analyser™ (ISA) program
(1) for the Texas 16-bit TMS320 signal processor family in machine language,
(2) for Motorola's 16 and 32-bit M68000 microprocessor families in machine language and C language,
(3) for IBM 600 Series 32-bit PowerPC Microprocessor Family in machine language and C language,
(4) for Intel 32-bit and 64-bit microprocessor families in C++ language.

Analysis pictures I have coded from the very beginning in Neon object-oriented programming language.

SYNTE2 said 43 years ago 1977, "Tämä on ohjelma, joka käsittelee tulevaisuutta" (This is a program about the future). The loudness values ​​for the named segments on the sone scale are "Tämä" 31, 48, 33, 46, "on" 53, 32, "ohjelma" 46, 28, 40, 55, 56, 34, 49, "joka" 34, 54, 20, 58, "käsittelee" 44, 62, 60, 55, 16, 56, 61, 57, "tulevaisuutta" 20, 44, 47, 52, 27, 57, 54, 60, 13, 62.

Signal display with multi-envelope display

Signal and multi-envelope display.

Signal display with multi-envelope display

Signal and multi-envelope display.