©copyright Raimo Olavi Toivonen 1982-2021. All rights reserved. Last updated on Jan 30, 2021.
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Works   Works before ISA


ISA software

Auditory timbre  spectra in lin/Bark scale

Google Scholar "Timbre Spectrum"  until 1983, 17 results.

Google Scholar "Timbre Spectrum"  982 results.

Google Images "Timbre spectrum"  many results.

Psychoacoustic links to "en.wikipedia.org/wiki":  Psychoacoustics   Auditory   Auditive   Auditory phonetics   Auditory system anatomy   Sone scale   Phon scale   Loudness   Equal-loudness contours   Fletcher-Munson curves   Bark scale   Critical bands   Auditory Filters   ERB scale (Equivalent rectangular bandwidth)   Mel scale   Semitone scale   Hertz scale   Sound pressure   SPL (Sound pressure level)   Stevens's power law   Stanley Smith Stevens   Harvey Fletcher   Karl Eberhard Zwicker

The terms "auditory" and "auditive" are different concepts. ISA expressly uses the term "auditory".

I am already 38 years used routinely Bark scale and the auritory filter bank model since my Otaniemi year 1983. I developed our own auditory filter bank model together with professor Matti Karjalainen.

Over the years, I have coded as a DSP man auditory filter bank model completely from zero
(1) for "PDP-11/34  Floating Point Systems  FPS 100 Vector Processor" in Fortran,
(2) for the Texas 16-bit TMS320 signal processor family in machine language,
(3) for Motorola's 16 and 32-bit M68000 microprocessor families in machine language and C language,
(4) for IBM 600 Series 32-bit PowerPC Microprocessor Family in machine language and C language,
(5) 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.

Loudness  formula is N=2(L-40)/10. Unit of loudness is Sone. L is sound volume level dBSPL of sine sound.

Hz is converted to Bark by the formula x/Bark=7ln[f/650+√(1+(f/650)2)] and Barks are converted to Hz by the formula f/Hz=650sinh(x/7).

I have used the above Bark conversion formulas since 1983.



SYNTE2 said 42 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.

Calculations of Toivonen's and Karjalainen's auditory timbre spectra 1983 in the Acoustics Laboratory in the Academy of Finland's "Modeling Speech Hearing" project 1983-87. At the top, the timbre  spectrum is generated when a cepstrum is calculated from the signal of each Bark channel in the auditory filter bank and the cepstrum peak is selected as the Bark channel sound value. Lower, the cepstrums calculated from the signals of the auditory filter bank channels. Since these experiments, a lot of scientific publications have been made in the Acoustics Laboratory concerning the detection of several simultaneous fundamental frequencies by means of an auditory filter bank.

Sharp peaks observed in the averaged cepstrum.




Calculations of Toivonen's and Karjalainen's auditory timbre spectra 1983 in the Acoustics Laboratory in the Academy of Finland's "Modeling Speech Hearing" project 1983-87. Since these experiments, a lot of scientific publications have been made in the Acoustics Laboratory concerning the detection of several simultaneous fundamental frequencies by means of an auditory filter bank.

 

Final report of the basic 4 years research project "Auditory modelling of speech perception" 1983-86 at Acoustics Laboratory May 1987. 110 pages. ISBN 951-754-154-6.