发明名称 |
DIGITALT AGC-ARRANGEMANG. |
摘要 |
An automatic gain control arrangement is provided for an analog to digital (A/D) converter in a television signal processing system. A gain-controlled source of analog signals applies a video information signal to the input of an A/D converter. The A/D converter produces digitized video signal samples at an output which is coupled to a digital peak detector. The digital peak detector detects the level of the digital samples of the synchronizing signal components. The detected sync signal level is compared with a desired value or range of values. If the detected sync signal level is not at the desired level or is outside the desired range, the count of a counter is incremented or decremented accordingly. The count of the counter is converted to an analog voltage which is applied to the gain-controlled signal source to control the level of the analog signal applied to the A/D converter. The analog voltage may also be combined with a control voltage produced by an analog peak detector, which detects the level of the input signal to the A/D converter, to produce a composite gain control signal. |
申请公布号 |
FI75963(B) |
申请公布日期 |
1988.04.29 |
申请号 |
FI19830000511 |
申请日期 |
1983.02.15 |
申请人 |
RCA CORPORATION |
发明人 |
STECKLER, STEVEN ALAN;BALABAN, ALVIN REUBEN |
分类号 |
H04N5/20;H03G3/20;H04B3/06;H04N5/52 |
主分类号 |
H04N5/20 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|