Features

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Spectrograms

The primary output of the SpeechStation2 is the spectrogram, a three-dimensional plot of frequency and spectral magnitude as a function of time.

In the SpeechStation2, spectrograms are displayed with 256 gray scale levels (or colors). On a typical monitor, the default spectrogram showing two seconds of speech will contain about a thousand spectra at 2-millisecond intervals. If the spectrogram is displayed on a typical 17-inch, 768x1024-pixel monitor, the spectrogram will be 7.5 cm (3 inches) high and about 32 cm (12 inches) long. Spectral lines will be separated by about 0.75 mm, so that spectrogram and monitor screen are efficiently matched, and visual resolution is nearly photographic.

A selection of data window types is provided, including Hamming, Hanning, Blackman and Rectangular, each at various lengths. The horizontal scale can be changed extremely easily, allowing a selection (as shown by the reversed segment at the bottom of the illustration) to be displayed as a spectrogram immediately.

Printed spectrograms made with SpeechStation2 are exceptionally clear and detailed. All of the screen displays provided by the SpeechStation2 can be printed with any Windows^®-compatible printer, directly or via a local network, in black-and-white or color.

Multiple spectrograms from different files can be displayed simultaneously, in full scale, for precise comparison. Spectrograms from different files can be printed separately or on the same sheet of paper.