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Sonogram ± An Acoustic Signal Analyzer / Editor by Hiroshi Momose Release note for Ver. 0.90 (beta) Jun 3, 1991 Caution!! This is a beta version and might not give accurate results. This is an acoustic signal analyzer program that let you do time±frequency analysis on sound signals. This program is based on EdSnd 1.4 by James Pritchett and Steven M. Boker, which, in turn, is based on SoundEditor by Lee Boynton. · Features that were originally planned but were not ready in this release · Zero-crossing analysis option. · Calculation of FFT by DSP. · Known limitations · Analysis can only be done on 16bit linear monaural sound. I'm somewhat sorry about this. Therefore, I include a couple of small utilities to convert sound files to the format which Sonogram can understand. A program named convs2m can be used to convert stereo sound file to a mono. file. Another program named convh2l can be used to convert the sound format to 22kHz 16bit linear (this is based on converttest.c found in /NextDeveloper/Examples/Sound). Just type convs2m or convh2l and hit return in the shell to see how to use them. · You can't double click on .snd file to run this program. · Known bugs · If you change the sampling frequency, the program will give incorrect time measurement results ( it still uses info. from .snd file itself ). · If you choose a fractional frequency value as the lower frequency range limit, the frequency label on the sonogram will be incorrect. ( Cursor measurement will still give a correct result ) · Cursor measurement gives a correct reading only immediately after the sonogram is drawn ( and before another sound file is opened ). · If you select new sound file and paste some sound from PasteBoard, you can't save it immediately. ( walkaround ± select another opened sound window, select the new one again ) · If you select the very beginning / end of the sound file as a start point of selection, the beginning/end of the sonogram display will be corrupted. · Plans for future additions · Pre-emphasis of the signal using digital filter. · Dragging in the sonogram view will measure mean frequency and rms values. · Sonogram window will be scrollable, and pixel size (in time axis) will be user selectable. · More analysis methods such as Cepstrum, LPC(max entropy method), Wavelet transform, etc. ( If someone has already figured out the algorithm for Wavelet, please teach me how.) · Saving / printing of sonograms. · 3-D waterfall display of sound energy distribution. · DSP (if I can figure out how to make it work fast). · Support for some A/D devices and real-time sonogram display. · Copyright notice You can use this beta version for free, but please don't sell it, and don't modify or remove this document when you re-distribute the program. The author retains all the copyright to this software ( some of the codes were written by other people, who retain their copyright to these specific portions of the program ± these authors' names are mentioned in the online help panel ( use the menu info / help ) and also in the file named Sonogram_Help.rtf, which is the same document as the one found in online help panel ). Please report bugs, comments and suggestions to : Dr. Hiroshi Momose Zoology, UC-Davis Davis CA 95616 hmomose@ucdavis.edu
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