.~ Line doublers type (e.g., interlace to progressive IDTV type) {3}
449
.~.~ Including nonstandard signal detection
DEFINITION
Classification: 348/449
Including nonstandard signal detection:
(under subclass 448) Subject matter including a means for determining whether the signal has a fixed line period (broadcast) or a variable line period (tape machine).
(1) Note. These systems normally switch operating modes using the previous field for standard signal and line interpolation for nonstandard signals.
