Title:
【発明の名称】文字発生器
Document Type and Number:
Japanese Patent JP3081255
Kind Code:
B2
Abstract:
A character generator comprises a phase-coupled clock signal generator which is implemented as a start-stop oscillator (1) to which a line signal is applied. The clock frequency is dependent on an adjusting value (F). For adjusting and monitoring the clock frequency, the clock signal generator is provided with a counter (2). This counter counts the number of clock pulses occurring during a predetermined period and thus supplies a counting value (C). A control circuit (3) compares the counting value (C) with a reference value and adapts the adjusting value (F) in such a way that the oscillator frequency is within a predetermined range. Such a character generator is suitable for On Screen Display applications in a television receiver.
Inventors:
Josephus Adrianis Aufstinus Den Oden
Application Number:
JP41110890A
Publication Date:
August 28, 2000
Filing Date:
December 17, 1990
Export Citation:
Assignee:
Konin Krekka Philips Electronics NV
International Classes:
G09G5/12; G09G5/18; G09G5/22; H03K3/0231; H03K4/502; H03L7/181; H04N5/278; (IPC1-7): G09G5/18; G09G5/12; H04N5/278
Attorney, Agent or Firm:
Akihide Sugimura (5 outside)