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Discovered Good article on VIR in RADIO-TELEVISION. It states VIR was designed for pro application, and only later was it extended to consumers (much the same way as DTMF routing was used behind the scenes by telcos, and only later extended to consumers.)
The article describes the use of the Tektronix 1440, a very precision instrument with no tweaking controls on front panel (unlike the consumer VIR) and how the 1440 (in a closed loop) would correct a transmitter for instance.
By providing subjective fine tuning on the home TV version, they were either admitting that they had lost the control VIR promised, or that the built-to-a-price GE circuit board lacked the precision of the pro 1440.
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06-26-2018, 12:58 AM
Hybrid Mode
