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 6Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 NextLast modified: November 3, 2007