westrex system การใช้

• In the Westrex system, each channel drives the cutting head at a 45-degree angle to the vertical.
• The Westrex system, briefly renamed Photophone, is still in use, with more than 100 systems currently in active service, world-wide.
• The Westrex system provided for the polarity of one channel to be inverted : this way large groove displacement would occur in the horizontal plane and not in the vertical one.
• The Westrex system was renamed Photophone after the Western Electric and Westrex registered trademarks were sold by AT & T and Litton Industries, respectively, to others, for uses other than cinema sound systems.
• Renaming the Westrex system to Photophone was facilitated by the demise of RCA's cinema sound business unit, by the hand of General Electric, RCA's acquirer, and by its failure to protect the Photophone trademark.
• The Westrex system also has the capability of producing a DTS time-code track along with its native stereo variable-area tracks, or DTS time-code alone for use with 70mm and " special venue " prints.