With today s level of technology, this information can be displayed in a variety of graphic forms. This tool has been in use since the 1940 s and the analysis techniques have become more and more sophisticated through generations of development. The spectrogram has been one of the most indispensable tools in the hands of the great voice researchers. But, until recently, this technology has been too expensive and therefore not available to anyone except those working in well-equipped laboratories. Some teachers, such as Richard Miller at Oberlin, have had the luxury of budgets permitting the purchase of spectrographic equipment and have employed such tools in practical voice studio application. .
Time runs from left to right.
Each horizontal line on the graphic represents a harmonic in the signal and their relative strengths can be read by changes in color and brightness. The wavy pattern in the partial lines is a representation of the singers vibrato.