JPS6046686A - Color video camera - Google Patents

Abstract

PURPOSE:To easily display a color title in an SECAM system color video camera by gating color difference signals with character pulses and altering only a character part. CONSTITUTION:Color difference signals (Y-R and B-Y) applied to input terminals 1 and 2 and character pulses 3 are applied to gates 4 and 5, whose outputs are supplied to mixing circuits 10 and 11. Color difference pulse circuits 8 and 9, on the other hand, convert the character pulses into color difference pulses having an amplitude of desired color on the basis of a color selection input, and the outputs are supplied to the mixing circuit 10 and 11 respectively. The outputs of those circuits 10 and 11 are supplied to a color difference sequencing circuit 12 and FM-modulated by an FM-modulating circuit 13, whose output is mixed by a mixing circuit 15 with a luminance signal to obtain a SECAM color signal.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a SECAM color video camera.

Conventional configuration and its problems Conventional NTSC color video cameras have adopted a color title display, but in the case of the SECAM system, which is different from the amplitude modulation method like the NTSC method, it uses an FM modulation method. It is not possible to display color titles using the NTSC method.

OBJECTS OF THE INVENTION The present invention provides a SECAM type color video camera capable of displaying color titles.

Structure of the Invention In order to achieve the above object, the present invention gates a color difference signal with a character pulse, and then minxes the color difference signal with a color signal made from a color selection input to generate Y-R, B.
- Y desired color difference signals are obtained, and based on the desired color difference signals, color difference sequential signals are created and FM modulated.

DESCRIPTION OF THE EMBODIMENTS The following is a description of an embodiment shown in one drawing. In Figure 1, 1
, 2 are terminals to which Y-R, B-Y color difference signals are applied, 3 is a terminal to which character pulses are applied, 4.5 is a character gate, 6 and 7 are selected using a resistor bleeder, volume or step voltage, etc. Terminals 8 and 9 to which the color selection input is added input character pulses and color selection input, and circuits 10 and 11 for generating the title color signal (color difference) of Y-RB-Y are connected to the gates 4 and 5. 12 is a color difference sequential circuit; 13 is an FM modulation circuit; 14 is a character mixing circuit;
is a chroma/luminance mixing circuit.

The operation of the above configuration will be explained below. First, input terminal 1,
The color difference signals (Y-R, B-Y) added to 2 and the character pulses are added to gates 4 and 5 to form the left signal as shown in the figure. On the other hand, the color difference pulse circuit 8.9 converts the character pulse into a color difference pulse having the amplitude of the desired color based on the color selection input.

In this state, the mixing circuits 10 and 11 control the gate 4.
, 5 and the outputs of the color difference nox circuits 8 and 9 are mixed and added to the color difference sequential circuit 12, the output becomes as shown in the figure. Thereafter, the output of the color difference sequential circuit 12 is FM.
The signal is FM modulated by the modulator 13 and mixed with the luminance signal by the mixing circuit 15 to become a second color signal.

In this case, the 8,90 color difference pulse circuit is as shown in FIG. , Dl, and D2 may be a digital configuration in which the three bits are used for title color control. In Fig. 2, 21 is a line switch polarity switching circuit, 24-2
6 is a Y-R, B-Y signal separation circuit, 22 is a polarity switching circuit, 23 is an in-phase/anti-phase switching circuit, 27 is a terminal to which a line switch input is added, 28.29 is a pulse with the amplitude of the desired color. This is a circuit that converts

In the above configuration, inputs to Do, Dl, and D2 (
The relationship between the outputs of circuits 28 and 29 for low (L) is as shown in FIG. , Dl, and outputs corresponding to the inputs to D2 are applied to the mixing circuit 10.11,
Thereafter, a color title signal is obtained by the same operation as explained in FIG.

In addition, in the case of Fig. 2, the outputs of circuits 28 and 29 are
However, as shown in FIG. 4, the outputs of the circuits 28 and 29 may be added to the color sequentialization circuit 30 for color sequentialization, and then mixed by the mixing circuit 31.

Effects of the Invention As described above with reference to the embodiments, the present invention allows color tiles to be displayed, and is also easy to configure because it uses a method in which only the character portion of the color difference signal is changed. Further, the signals D0 to D2 can be generated using a microcomputer built into the camera.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the main parts of a color video camera according to an embodiment of the present invention, FIG. 2 is a detailed block diagram of a part of FIG. 1, and FIG. 3 is an input diagram of the circuit of FIG. FIG. 4, a diagram showing the relationship of outputs, is a block diagram of main parts of another embodiment of the present invention. 45...Character pulse, 8,9...
Color difference pulse circuit, 10, 11...Mixing circuit, 12.30 -...Color difference sequential circuit, 13...
FM modulation circuit.

Claims (2)

[Claims] (1) A color video camera equipped with a means for controlling a title color signal using a multi-bit digital input and mixing the controlled output into a color difference signal. (2) The color video camera according to claim 1, wherein the mixing means mixes the color-sequential title color signal into the color-sequential color difference signal.