基本信息:
- 专利标题:
- 申请号:DE2935104 申请日:1979-08-30
- 公开(公告)号:DE2935104A1 公开(公告)日:1980-03-13
- 发明人: HAGIWARA YOSHIMUNE , SAWASE TERUMI , TAKAI ATSUSHI , KITA YUZO , HONDA AKIRA
- 申请人: HITACHI LTD
- 专利权人: HITACHI LTD
- 当前专利权人: HITACHI LTD
- 优先权: JP10621278 1978-09-01
- 主分类号: H03J5/02
- IPC分类号: H03J5/02 ; H03J5/00
摘要:
A television receiver of electronic tuning type employing a variable capacitance diode in a local oscillator of its tuning circuit, which comprises a memory storing a plurality of digital data indicative of tuning voltages corresponding to a plurality of channels respectively so that a tuning voltage corresponding to a selected channel can be applied to the variable capacitance diode in the tuning circuit, a D/A converter converting a digital data corresponding to a selected channel into an analog voltage to be supplied to the variable capacitance diode, and a tuning voltage control circuit which functions to sequentially modify, at a predetermined rate, the digital data of the selected channel read out from the memory until the tuning point is reached in the tuning circuit, and which applies sequentially such a signal to the D/A converter, whereby the tuning circuit can be tuned to the selected channel regardless of secular and other variations in the operating characteristic of the variable capacitance diode.
信息查询:
EspacenetIPC结构图谱:
H | 电学 |
--H03 | 基本电子电路 |
----H03J | 谐振电路的调谐;谐振电路的选择 |
------H03J5/00 | 不连续调谐;选择预定的频率;在一个或一个以上频带内有或无连续调谐的频带的选择,例如按钮调谐、回转调谐器 |
--------H03J5/02 | .带有许多预定位置并可调到任何一个需要位置的可变调谐元件 |