| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic system discriminating circuit that has effects of few malfunctions and quick discrimination, in the case of discriminating a chroma system. SOLUTION: This automatic system discrimination circuit is provided with multiplier circuits 101, 102, 103, a 1st low-pass filter circuit 104, a 2nd low-pass filter circuit 105, a burst level detection circuit 106, a changeover circuit 107, a SECAM ID detection circuit 108, a PAL ID detection circuit 109, an NTSC ID detection circuit 110, a chroma demodulating circuit 111, a discrimination logic circuit 112, a phase error accumulating circuit 113, a data conversion circuit 114, a VCO(voltage controlled oscillator) circuit 115, an adder circuit 116, and changeover circuits 117 and 118.
|
