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Apparatus and method of converting image signal

  • US 9,826,193 B2
  • Filed: 07/24/2015
  • Issued: 11/21/2017
  • Est. Priority Date: 03/25/2015
  • Status: Active Grant
First Claim
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1. A method of converting a digital image signal into an analog image signal, the method comprising:

  • receiving a digital image signal that is obtained through an image sensor;

    determining one of a national television system committee (NTSC) standard and a phase-alternating line (PAL) standard as a target standard;

    changing a number of horizontal scan lines of the digital image signal to comply with a vertical resolution of the target standard;

    generating a sample frequency by dividing a number of horizontal pixels of the digital image signal by a horizontal scan period that complies with the target standard;

    converting the digital image signal having the changed number of horizontal scan lines into an analog image signal according to the sample frequency; and

    transmitting the analog image to a video amplifier and a low-pass filter,wherein the video amplifier is configured to amplify the analog image signal, andwherein the low-pass filter is configured to pass through the amplified analog image signal, have a cutoff frequency of 11.25 MHz, and include a capacitor for preventing a surge.

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