发明名称 |
Digital circuit for providing a binary signal on the occurrence of a predetermined frequency ratio of two signals |
摘要 |
The invention provides a digital circuit for generating a binary signal output when a predetermined frequency ratio, v=f1/f2, of two signals F1 and F2 occurs during a selected measuring period. The circuit is particularly adapted for use in a color television receiver to determine the ratio between the chrominance-subcarrier frequency and the horizontal frequency, which ratio is fixed at the transmitting end, both in the PAL system and the NTSC system.
|
申请公布号 |
US4509072(A) |
申请公布日期 |
1985.04.02 |
申请号 |
US19840592900 |
申请日期 |
1984.03.23 |
申请人 |
ITT INDUSTRIES, INC. |
发明人 |
ELMIS, HERBERT;KLAR, ADRIAN |
分类号 |
H04N9/44;(IPC1-7):H04N9/44 |
主分类号 |
H04N9/44 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|