Design and Development of a Graphics System for Display of Sound Spectrograms

摘要

A graphics system for display of sound spectrograms was designed and implemented on a Data General NOVA computer which is interconnected with a S-100 bus system. The system allows the user to interactively select a section of the spectrogram for further analysis through the use of a set of cursors. The computer systems used in the development of this project are described. The theory involved in the generation of digital sound spectrograms is detailed along with the display methodology used. The user is provided the choice of four spectral windows and the relative merits of each window are described and compared. The six major classifications of spectrogram patterns -- called sound-pattern groups -- are described. Spectrograms that show the characteristic pattern for each sound-pattern group are presented along with spectrograms that show the differences between narrow and wide-band spectral analysis. The computer programs developed on both the NOVA and the S-100 system are described. (Author)