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Colour signal processing apparatus

A color signal and processing device technology, applied in color signal processing circuits, TV transmission systems characterized by the combination of various color image signal components, automatic power control, etc., can solve problems such as clamping level loss

Inactive Publication Date: 2004-04-21
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the no-signal period (such as the BGP period) is used as the keying period, it is generally easy to generate noise during this period
Also, the problem is that if noise is mixed in, the clamping level is lost in response to the noise

Method used

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  • Colour signal processing apparatus
  • Colour signal processing apparatus
  • Colour signal processing apparatus

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Embodiment Construction

[0016] figure 1 is the color signal processing device of the present invention. 10 is a PAL color signal processing circuit for processing PAL color signals; 11 is a SECAM color signal processing circuit, including figure 1 The block diagram other than the PAL color signal processing circuit 10; 12 is to include VCO13, phase comparator 14, LPF15, V / I converter between the carrier frequency of the B-Y signal of SECAM mode and the R-Y signal carrier frequency that center frequency is set 16, current adder 17, and makes the SECAM color signal do FM demodulation PLL type detection circuit; 18 is the switch that selectively outputs the frequency signal of 4.43MHZ and 4.0MHZ in the PAL color signal processing circuit 10; 19 is in the PLL type On the detection circuit 12, a switch is selectively added from the SECAM color signal or the signal of the switch 18; 20 is to keep the first holding part of the output signal of the PLL type detection circuit when the 4.0MHZ signal is sele...

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Abstract

The invention relates to colour signal processing apparatus, including a PLL type detection circuit for FM demodulation of a SECAM chroma signal, selection means which selectively applies first and second reference frequency signals in a SECAM chroma signal or PAL chroma signal processing circuit to the PLL type detection circuit, a first holding means which holds the output signal of the PLL type detection circuit at the time of selection of the first reference frequency signal, a second holding means which holds the output signal or the PLL type detection circuit at the time of selection of the second reference frequency signal, and a voltage generation circuit which takes out a voltage placed on the line connecting two output voltages of first and second holding means are provided.

Description

technical field [0001] The present invention relates to a color signal processing device equipped with a SECAM color signal circuit for processing SECAM color signals and a PAL color signal processing circuit for processing PAL color signals; in particular, it relates to color signal processing for automatically adjusting the VCO center frequency in the SECAM color signal processing circuit device. Background technique [0002] The B-Y signal and R-Y signal of the SECAM color signal are modulated and transmitted in row order, and the different carrier frequencies are 4.25MHZ (B-Y) and 4.406MHZ (R-Y). Therefore, in the past, color signal detection was implemented by manually adjusting the center frequency of the VCO of the PLL type detector to 4.33MHZ (between 4.25MHZ and 4.406MHZ). [0003] figure 2 It is a block diagram of the SECAM color signal processing circuit. The SECAM color signal extracted from the bell filter 1 is limited by the working amplitude of the limiting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/64H04N9/66H04N11/06
CPCH03L7/08H04N9/66H04N11/16H04N11/18
Inventor 植木敬次郎大泽郁郎畑隆司
Owner SANYO ELECTRIC CO LTD
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