Appeal No. 96-4011
Application No. 07/996,525
difference signal. The luminance signal Y inputs low-pass filter
103 and band-pass filter 109. The output from the low-pass
filter 103 inputs both a subtracter 105 and a high-pass filter
104. The high-band luminance signal YH is subtracted from the
luminous signal Y to yield a low-band luminous signal YL. The
low-band luminous signal YL is frequency modulated by frequency
modulator 106 into a frequency modulated, low-band luminance
signal FM-YL. The high-band luminous signal output YH from high-
pass filter 104 is also supplied to multiplier 107 where it is
multiplied by a carrier signal from pulse generator 127 to yield
a carrier high-band luminous signal YH . The carrier high-band’
luminous signal YH is then sent through low-pass filter 108.’
The input signal to low-pass filter 103 also passes through band-
pass filter 109, demodulation circuit 110, and line concurrency
circuit 111 where two difference signals are produced as inputs
to the two low-pass filters 112 and 113. After the process of
band limiting in the low-pass filters, the two difference signals
are converted into a carrier chrominance signal C by the
quadrature two-phase modulation circuit 115. The band of the
carrier chrominance signal C is then limited by the low-pass
filter 114. Prior to entering the mixer 121, the spectrum of the
carrier chrominance signal C and that of the carrier high-band
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Last modified: November 3, 2007