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Selected sentences created with the
Pattern Playback

(Click on sentences for additional information.)

These days a chicken leg is a rare dish.

Chicken

in AIFF format (22Hz,88K) or in AU format (8kHz,33K)

It's easy to tell the depth of a well.

Well

in AIFF format (22Hz,88K) or in AU format (8kHz,33K)

Four hours of steady work faced us.

FourHours

in AIFF format (22Hz,88K) or in AU format (8kHz,33K)

A large size in stockings is hard to sell.

Stockings

in AIFF format (22Hz,88K) or in AU format (8kHz,33K)

Never kill a snake.

Snake

in AIFF format (22Hz,88K) or in AU format (8kHz,33K)


The sample sound file for Never kill a snake (from Aug. 1958) contains three versions.
(a) by transmission
(b) by reflection (a hand copy with fine structure preserved)
(c) by reflection (a hand copy which has been simplified and schematized).

By Transmission
The Pattern Playback can convert spectrograms into sound. In one form of operation (transmission), a negative is made from a sound spectrogram so that regions occupied by sound are now transparent. Modulated light passed through these regions is picked up by the light collector and amplified.

By Reflection
To hand-copy a spectrogram, a clear sheet of plastic is placed over the spectrogram. Those regions that contain sound in the original are copied over with white paint. The light collector on the Pattern Playback now picks up only those frequencies that are reflected by the white paint.