A circle was used in this picture to ensure that the recipients use the correct ratio of horizontal to vertical height in picture reconstruction. Immediately below this is a replica of the first picture on the record to permit the recipients to verify that they are decoding the signals correctly. Immediately below this is a drawing of an entire picture raster, showing that there are 512 (2 9) vertical lines in a complete picture. The drawing immediately below shows how these lines are to be drawn vertically, with staggered "interlace" to give the correct picture rendition. Picture lines 1, 2 and 3 are noted in binary numbers, and the duration of one of the "picture lines," about 8 milliseconds, is noted.
#VOYAGER DISK MAP SERIES#
The picture is made from this signal, which traces the picture as a series of vertical lines, similar to analog television (in which the picture is a series of horizontal lines). The top drawing shows the typical signal that occurs at the start of a picture. The information in the upper right-hand portion of the cover is designed to show how pictures are to be constructed from the recorded signals. Below this drawing is a side view of the record and stylus, with a binary number giving the time to play one side of the record-about an hour (more precisely, between 53 and 54 minutes). The drawing indicates that the record should be played from the outside in.
Written around it in binary arithmetic is the correct time of one rotation of the record, 3.6 seconds, expressed in time units of 0.70 billionths of a second, the time period associated with a fundamental transition of the hydrogen atom. The stylus is in the correct position to play the record from the beginning. In the upper left-hand corner is a drawing of the phonograph record and the stylus carried with it. Be a Voyager, exploring of the universe, while wearing this 1.25" version of the plaque on the Voyager spacecrafts.
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