KR100663129B1 - Method and apparatus for converting digital image signal to tv signal - Google Patents

Abstract

A method and an apparatus for converting digital video signals into TV signals are provided to embody a frame memory and a synchronization signal generator with a TV encoder, thereby facilitating design and easily controlling input/output of video signals. An apparatus for converting digital video signals into TV(Television) signals comprises the followings: a frame memory(303) for storing digital video signals received from the outside; a TV time signal generator(301) for generating TV synchronization signals; a frame memory controller(305) for controlling output timing of the digital video signal stored in the frame memory(303) corresponding to the TV synchronization signal generated in the TV time signal generator(301); and a TV encoder(307) which converts the digital video signal, outputted in the frame memory(303), into TV signals corresponding to the TV synchronization signal generated in the TV time signal generator(301), and outputs the converted signal.

Description

Method and Apparatus for converting digital image signal to TV signal {Method and Apparatus for converting digital image signal to TV signal}

1 is a diagram illustrating a connection relationship between TV encoders;

2 is a block diagram showing a detailed configuration of a conventional TV encoding apparatus of FIG.

3 is a block diagram showing a configuration of a TV signal conversion apparatus for converting a digital video signal into a TV signal according to an embodiment of the present invention;

4 is a flowchart illustrating a method of converting a digital video signal into a TV signal by the TV conversion apparatus of FIG.

5 is a view showing a case in which the TV signal conversion device according to an embodiment of the present invention is used in a digital video signal output device of the CPU interface method;

6 is a block diagram showing the configuration of a TV signal conversion apparatus according to another embodiment of the present invention;

7 is a flowchart illustrating a process of converting a TV signal in the TV signal conversion apparatus of FIG. 6.

<Explanation of symbols for the main parts of the drawings>

301: TV time signal generator

303: frame memory

305: frame memory controller

307: TV Encoder

The present invention relates to a method and apparatus for converting a digital video signal into a TV signal.

In general, in order to output a digital video signal from a digital device such as a PC or a DVD device, a digital output device such as a CRT monitor or LCD capable of outputting a digital video signal is required.

A TV encoder is a device that converts a digital video signal into an analog signal so that the digital video signal can be displayed in a device that outputs an analog video signal, such as a general television receiver, instead of the digital output device.

1 is a diagram illustrating a connection relationship between such TV encoders. Referring to FIG. 1, the TV encoding apparatus 103 is coupled between a digital video signal output device 101 such as a portable multimedia player (PMP), a mobile phone, etc., and a TV receiver 105, for example. The digital video signal output from the 101 is converted into an analog video signal and output to the TV receiver 105. Here, the TV encoding apparatus 103 generally receives a digital video signal from a frame memory for storing an input digital video signal, a TV time signal generator for generating a TV synchronization signal, and a frame memory to correspond to the TV synchronization signal. And a TV encoder for converting the analog video signal.

FIG. 2 is a block diagram showing the detailed configuration of the conventional TV encoding apparatus 103 of FIG. Referring to FIG. 2, the TV encoding apparatus 103 receives a synchronization signal and a digital image signal from the digital image output apparatus 101. The received synchronization signal is converted into a TV synchronization signal by the TV time signal generator 201 existing inside the TV encoding apparatus according to the standard agreement of the TV synchronization signal, and the received digital video signal is stored in the frame memory 203. do.

The digital video signal stored in the frame memory 203 is transmitted to the TV encoder 205 corresponding to the TV synchronization signal, and the TV encoder 205 converts the received digital video signal into an analog video signal and outputs the analog video signal.

As described above, the conventional TV encoder must separately include a frame memory for storing a digital video signal input from the outside, and the timing for outputting the digital video signal to the frame memory must be determined in advance by the TV synchronization signal. In addition, there is a problem that the actual design is very difficult in that the size of the frame memory must be considered in advance for the control of the input / output timing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and by implementing a frame memory and a synchronization signal generator together with a TV encoder, the design is simple and the digital image can be easily controlled input / output of a video signal. It is an object of the present invention to provide a method and apparatus for converting a signal into a TV signal.

In order to achieve the above objects, according to an aspect of the present invention, in the TV signal conversion apparatus for converting a digital video signal into a TV signal, generating a frame memory, a TV synchronization signal for storing the digital video signal received from the outside A TV time signal generator, a frame memory controller for controlling an output timing of a digital video signal stored in the frame memory corresponding to the TV synchronization signal generated by the TV time signal generator, and a TV generated by the TV time signal generator According to an embodiment, there is provided a TV signal converting apparatus including a TV encoder for converting a digital video signal output from the frame memory into a TV signal and outputting the TV signal to the outside.

In a preferred embodiment, the frame memory includes at least two or more memory means, and the frame memory controller stores the input digital video signal in one of the memory means for each frame, and the digital video signal is stored in the frame order. The memory means may be controlled to be output. The TV synchronization signal generated by the TV time signal generator may include at least one of a horizontal synchronization signal HSYNC and a vertical synchronization signal VSYNC. In addition, the TV synchronization signal generated by the TV time generator may be characterized in accordance with the ITU-R BT.601 and ITU-R BT.656 protocol.

In another aspect of the present invention, a TV signal conversion apparatus for converting a digital video signal into a TV signal, the frame memory for storing the digital video signal for a specific frame received from the outside, the TV generating a TV synchronization signal A time signal generator and a digital video signal of a specific frame stored in the frame memory corresponding to the TV synchronization signal generated by the TV time signal generator are divided into two fields and a digital video signal for any one of the divided fields. Converts a digital image signal of any one of the divided fields output from the frame memory into a TV signal corresponding to the TV synchronization signal generated by the frame memory control unit and the TV time signal generator TV outputting to the external and the frame memory at a predetermined first time point And an encoder, wherein the frame memory further stores a TV signal output from the TV encoder under the control of the frame memory controller and outputs the stored TV signal to the outside at a predetermined second time point. A TV signal conversion device can be provided.

In a preferred embodiment, the two distinct fields may be fields for odd and even rows in the vertical direction. The frame memory may include at least two memory means, and the frame memory controller stores the input digital video signal in one of the memory means for each frame and outputs the digital video signal in the frame order. It may be characterized by controlling the means.

In another aspect of the present invention, in a method of converting a digital video signal into a TV signal in a TV signal encoding apparatus including a frame memory, a TV time signal generator, a frame memory controller, and a TV encoder, the digital video signal Receiving and storing the digital video signal stored in the frame memory to a TV encoder by a control signal of a frame memory controller; and converting the digital video signal output from the frame memory from the TV encoder to a TV time. The method may include converting a TV signal into an TV signal and outputting the signal to an external device according to the TV synchronization signal generated by the signal generator.

In another aspect of the present invention, in a method of converting a digital video signal into a TV signal in a TV signal encoding apparatus including a frame memory, a TV time signal generator, a frame memory controller, and a TV encoder, Receiving a digital video signal and storing the digital video signal in one of the divided fields by dividing the digital video signal of the specific frame stored in the frame memory into two fields. Outputting to the TV encoder, converting the digital video signal for any one field output from the frame memory in the TV encoder into a TV signal corresponding to the TV synchronization signal generated by the TV time signal generator; Output TV signals to the external and frame memory at a predetermined first time point And storing the TV signal output to the frame memory and outputting the stored TV signal to the outside at a predetermined second time point.

Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing the configuration of a TV signal conversion apparatus for converting a digital video signal into a TV signal according to an embodiment of the present invention.

Referring to FIG. 3, the TV signal conversion apparatus of the present embodiment includes a TV time signal generator 301, a frame memory 303, a frame memory controller 305, and a TV encoder 307.

The TV time signal generator 301 generates a TV synchronization signal, and the frame memory 303 receives and stores a digital video signal from an external device such as a digital video signal output device (see FIG. 1) that outputs a digital video signal. do. Here, the TV synchronization signal is a synchronization signal according to a standard protocol such as ITU-R 601 or ITU-R 656, and preferably includes at least one of a horizontal synchronization signal HSYNC and a vertical synchronization signal VSYNC. Do.

The frame memory controller 305 controls an output timing of outputting a digital video signal stored in the frame memory 303 to the TV encoder 307 corresponding to the TV synchronization signal generated by the TV time signal generator 301. do.

The TV encoder 307 converts a digital video signal output from the frame memory 303 into a TV signal, which is an analog video signal, in response to the TV synchronization signal generated by the TV time signal generator 301. Output to the same analog output device.

Here, the TV signal conversion apparatus of the present embodiment, the TV time signal generator 301 and the TV time signal generator 301 of the digital image signal stored in the frame memory 303 corresponding to the TV synchronization signal generated by Since it includes a frame memory control unit 305 for controlling the output, unlike the conventional TV encoding apparatus, it is not necessary to receive the synchronization signal from the digital video signal output apparatus.

The frame memory 303 may use a double buffer structure. Herein, the dual memory means alternating use of a read memory and a write memory, for example, having at least two physically separated memory means, and any one of the memory means. This is a configuration to output data from other memory while receiving data from.

In this case, since the digital video signal input or output from the outside is usually input in units of frames, the frame memory controller 305 is configured to record the digital image signal data in units of frames input to any one memory unit in units of frames. When the digital image signal data is output from the frame memory 303 to the TV encoder 307, the control is performed in the order of frames. When the frame memory 303 is implemented as a dual memory structure, the tearing effect of the screen can be effectively improved.

4 is a flowchart illustrating a method of converting a digital video signal into a TV signal by the TV conversion apparatus of FIG. 3.

Referring to FIG. 4, first, when a digital video signal is input from an external digital video signal output device (step 401), the input digital video signal is stored in the frame memory 303 (step 403). In this case, the input digital video signal may be input in units of frames as described above. In this case, when the frame memory is implemented as a dual memory, the digital image signal is stored in any one of a plurality of memory means constituting the frame memory.

Meanwhile, the TV time signal generator 301 generates a TV synchronization signal as described above (step 407), and the frame memory controller 305 outputs the digital video signal stored in the frame memory 303 in correspondence with the TV synchronization signal. Output to TV encoder 307 (step 405).

The TV encoder 307 receives the digital video signal from the frame memory 303 and converts it into a TV signal which is an analog video signal corresponding to the TV synchronization signal generated by the TV time signal generator 301 (step 409). Output to an analog video signal output device such as a receiver.

FIG. 5 is a diagram illustrating a case where a TV signal conversion device according to an embodiment of the present invention is used in a digital video signal output device using a CPU interface.

The CPU interface method refers to a method of transmitting only a digital video signal without having to consider an update timing of a screen of an output device when outputting a digital video signal. For example, when an image signal is output to a digital image output device such as an LCD display, it refers to a method of transmitting and outputting only an image signal without transmitting a signal for update timing of the LCD display screen.

Referring to FIG. 5, the digital video signal generator 501 transmits only the digital video signal to the LCD display 503. As described above, the apparatus for converting a TV signal 505 may be generated by itself without receiving a synchronization signal, and thus may be directly connected to the digital image signal generator 501. In this case, when the digital video signal generator 501 is a small device such as a PMP or a mobile phone, the output terminal of the digital video signal generator 501 is not provided separately for an analog output device such as a TV receiver. Can be shared with a digital video signal output device such as an LCD display 503, thereby miniaturizing the device and increasing the utilization of space.

6 is a block diagram showing the configuration of a TV signal conversion apparatus according to another embodiment of the present invention.

Conventional TV encoders use a method of converting and outputting a digital video signal in units of frames, dividing it into two fields, and then converting and outputting them in units of fields. That is, each row constituting one frame is divided into two fields of an odd field, which is a combination of odd rows, and an even field, which is a combination of even rows, and the odd fields are first encoded and transmitted. A method of encoding and transmitting a field may be used. This is based on an experimental example or psychological theory that human vision is insensitive to changes in the vertical direction, in which only one field is encoded and stored without the need to encode both odd and even fields, and the other fields are previously encoded. Even if the stored signal is transmitted again, the visual quality cannot be noticed.

The embodiment of FIG. 6 may be applied to such a case. In the frame memory 303, the video signal data of any one of the video signal data divided into at least two fields, such as an odd field or an even field, may be selected from the TV encoder. When inputted to 307, the TV encoder 307 is configured not to output it immediately after converting it into a TV signal, but to temporarily store it in the frame memory 303 (601) and output it externally at the next output timing ( 603). Other configurations are the same as those described in FIG. 3, and thus detailed descriptions thereof will be omitted.

7 is a flowchart illustrating a process of converting a TV signal in the TV signal conversion apparatus of FIG. 6.

Referring to FIG. 7, the digital video signal is input to the TV signal conversion apparatus (step 701), and the input digital video signal is stored in the frame memory 303 (step 703).

The frame memory controller 305 transmits a digital video signal to the TV encoder 307 corresponding to the TV synchronization signal generated by the TV time signal generator 301. At this time, the digital video signal transmitted is an output of an odd field. (Step 705).

In the case of the output of the odd field, the TV encoder 307 encodes the video signal for the odd field (step 707) and outputs the TV signal to the outside (step 909). At the same time, the TV signal output to the outside is stored in the frame memory 303 again (step 711).

On the other hand, if the digital video signal output from the frame memory is not the output of the odd field, that is, the output of the even field, the frame memory control unit 305 stores the output of the even field earlier without transmitting to the TV encoder 307. The encoded signal for the odd numbered field is output directly to the outside of the device (step 713).

According to the embodiments of FIG. 6 and FIG. 7, the video signal data constituting one frame may be divided into at least two fields and converted to only one field, thereby greatly reducing power consumed in the TV encoder device. .

According to the present invention, a method and apparatus for converting a digital video signal to a TV signal by implementing a frame memory and a synchronization signal generator together with a TV encoder, which enables simple design and more easily control the input / output of the video signal. Can be provided. In addition, since the output terminal of the output device using the CPU interface method can be shared, the device can be miniaturized and the space can be used efficiently.

Further, according to the present invention, since the video signal input to the TV encoder can be divided into at least two fields to perform only video signal conversion for any one field, power consumption can be reduced.

Claims (9)

In the TV signal conversion device for converting a digital video signal into a TV signal, A frame memory for storing a digital video signal received from an external device; A TV time signal generator for generating a TV synchronization signal; A frame memory controller configured to control an output timing of a digital video signal stored in the frame memory corresponding to the TV synchronization signal generated by the TV time signal generator; And A TV encoder for converting a digital video signal output from the frame memory into a TV signal and outputting the signal externally corresponding to the TV synchronization signal generated by the TV time signal generator; TV signal conversion device comprising a. The method of claim 1, The frame memory comprises at least two memory means, The frame memory control unit stores the input digital video signal in each one of the memory means for each frame and controls the memory means such that the digital video signal is output in the frame order. TV signal conversion device characterized in that. The method of claim 1, The TV synchronization signal generated by the TV time signal generator includes at least one of a horizontal synchronization signal HSYNC and a vertical synchronization signal VSYNC. TV signal conversion device characterized in that. The method of claim 1, The TV synchronization signal generated by the TV time generator is in accordance with ITU-R BT.601 and ITU-R BT.656 protocol. TV signal conversion device characterized in that. In the TV signal conversion device for converting a digital video signal into a TV signal, A frame memory for storing a digital video signal for a specific frame received from the outside; A TV time signal generator for generating a TV synchronization signal; The digital video signal of a specific frame stored in the frame memory is divided into two fields corresponding to the TV synchronization signal generated by the TV time signal generator, and outputs a digital video signal for any one of the divided fields. A frame memory control unit for controlling; And In response to the TV synchronization signal generated by the TV time signal generator, the digital image signal of any one of the divided fields output from the frame memory is converted into a TV signal to be converted into a TV signal. TV encoder outputs to frame memory Including but not limited to: The frame memory further stores a TV signal output from the TV encoder under the control of the frame memory controller and outputs the stored TV signal to the outside at a predetermined second time point. Characterized in that the TV signal conversion device. The method of claim 5, And said two distinct fields are fields of odd rows and fields of even rows in a vertical direction. The method of claim 5, The frame memory comprises at least two memory means, The frame memory control unit stores the input digital video signal in any one of the memory means for each frame and controls the memory means such that the digital video signal is output in the frame order. TV signal conversion device characterized in that. A method for converting a digital video signal into a TV signal in a TV signal encoding apparatus including a frame memory, a TV time signal generator, a frame memory controller, and a TV encoder, Receiving a digital video signal and storing the digital video signal in a frame memory; Outputting a digital video signal stored in the frame memory to a TV encoder by a control signal of a frame memory controller; And Converting the digital video signal output from the frame memory by the TV encoder into a TV signal corresponding to the TV synchronization signal generated by the TV time signal generator and outputting the TV signal to the outside; TV signal conversion method comprising a. A method for converting a digital video signal into a TV signal in a TV signal encoding apparatus including a frame memory, a TV time signal generator, a frame memory controller, and a TV encoder, Receiving a digital image signal for a specific frame and storing the received digital image signal in the frame memory; Dividing the digital video signal for the specific frame stored in the frame memory into two fields and outputting the digital video signal for any one of the divided fields to the TV encoder; The TV encoder converts a digital video signal of one field output from the frame memory into a TV signal corresponding to the TV synchronization signal generated by the TV time signal generator, and converts the converted TV signal into a predetermined first viewpoint. Outputting to an external and the frame memory; And Storing the TV signal output to the frame memory and outputting the stored TV signal to the outside at a predetermined second time point; TV signal conversion method comprising a.

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