KR100527427B1 - Moving Image Reproduction Device with High Power and Sound Quality, and The Reproduction Method - Google Patents

Abstract

The present invention provides a video playback apparatus comprising a transmitter for encoding a video analog signal into a digital signal and transmitting it through a network, and a receiver for receiving an encoded signal from the transmitter, decoding the same, and playing a video. And an audio delay controller for synchronizing audio data bypassed by an encoder of a transmitter and video data played by a receiver and outputting the audio data to a speaker of the transmitter. A device and a video playback method are provided.

The reproducing apparatus according to the present invention prevents degradation of audio sound quality that may be caused by low output and poor characteristics of a conventional speaker, which is a small device, and uses a separate line output for high output and high sound quality. Has the effect of removing the speaker wire.

Description

Moving Image Reproduction Device with High Power and Sound Quality, and The Reproduction Method

The present invention relates to a video reproducing apparatus and a video reproducing method using a network, and more particularly, to prevent degradation of audio quality that may be caused by low output and poor characteristics of a speaker of a receiver, and to secure high output and high sound quality. The present invention relates to a video player and a video playback method capable of removing a speaker connection line for a separate line output.

Recently, with the development of mobile or wireless LAN technology, a system in which a transmitter (or an encoder) and a receiver (or a decoder) that encodes a video in a home and decodes it in a mobile device or a wireless device and a TV has been released has been released.

1 is a configuration diagram of a video reproducing apparatus using a conventional network, wherein a transmitter includes a tuner 1, an ADC for video signal 2, an ADC for audio signal 3, an encoder 4, and a transmitter network 5 such as a wireless LAN. The receiver comprises a receiver network 6 such as a wireless LAN, a buffer 7, a decoder 8, an audio controller 9, a speaker 10, a display controller 11, and a display device 12 such as an LCD. It is composed of

Referring to FIG. 1, the conventional video reproducing apparatus converts analog video and audio signals received from the tuner 1 into digital signals through the respective ADCs 2 and 3, and the converted signals are converted into MPEG2 and the like. The encoder 5 is encoded by the encoder 5 and transmitted to the receiver network 6 through a transmitter network 5 such as a wireless LAN. The received video and audio signals are temporarily stored in the buffer 7 and then decoded by a decoder 8 such as MPEG2 so that the audio signals are output to the speaker 10 through the audio controller 9, and the video signals are displayed in the display controller ( 11) is output to the display device 12 such as an LCD.

In the conventional video reproducing apparatus having the above structure, the receiving unit is often small, so that the sound quality is poor by using a small speaker due to the limitation of physical space. On the other hand, when connecting a separate speaker, the inconvenience caused by the connection line or appearance problems are exposed, accompanied by a problem of generating various noise.

SUMMARY OF THE INVENTION The present invention has been made to overcome the limitations of the prior art, and its object is to reduce audio quality, which may be caused by low output and poor characteristics of a receiver speaker, which is a conventional compact device, by reproducing audio at a transmitter. To prevent, and to secure a high output and high sound quality to provide a video playback device that can remove the speaker connection line for a separate line output.

Another object of the present invention is to provide a method of playing a video, in which audio is reproduced by a transmitter in order to prevent degradation of audio quality which may be caused by low output and poor characteristics of a receiver speaker, which is a conventional small device.

In order to achieve the above object, the present invention includes a transmitter for encoding a video analog signal into a digital signal and transmitting the same through a network, and a receiver for receiving the encoded signal from the transmitter, decoding the same, and playing the video. In the apparatus,

The transmitter includes a speaker for outputting audio, and a video reproducing apparatus including an audio delay controller for synchronizing audio data bypassed by the encoder of the transmitter and video data played by the receiver and outputting the audio data to the speaker of the transmitter. Provide the device.

The video reproducing apparatus according to the present invention preferably uses SCR or PCR as timing information used for synchronization.

The video reproducing apparatus according to the present invention preferably includes a timer for checking in real time the delay time T _T between the audio timing information bypassed by the encoder of the transmitter and the timing information of the audio transmitted from the decoder of the receiver. And an audio delay controller for delaying the playback time of the bypassed audio data by the delay time obtained from the timer.

The video reproducing apparatus according to the present invention preferably includes a timer for checking in real time the delay time T _T between the audio timing information bypassed by the encoder of the transmitter and the timing information of the audio transmitted from the decoder of the receiver. And an audio delay controller which obtains a correction delay time T _c according to the following equation from a delay time T _T obtained in real time by the timer and delays the reproduction of the audio data bypassed by the correction delay time. .

T _c = (B / (1 + B)) T _T + A / (1 + B)

Where B = (time it takes the encoder to send the packet to the decoder) / (time it takes the decoder to send the timing information to the encoder),

A is the sum of the times the packet stays in the receiver's buffer and decoder,

T _T is a delay time between the audio timing information bypassed by the encoder of the transmitter and the timing information of audio transmitted from the decoder of the receiver.

The present invention also provides a method for encoding a moving picture analog signal into a digital signal at a transmitter and transmitting it to a receiver through a network, wherein the receiver receives the encoded signal from the transmitter and decodes the encoded signal.

Bypassing audio data at an encoder of a transmitter;

Delaying reproduction of the bypassed audio data by a predetermined time and synchronizing with reproduction of video data at a receiving unit; And

And outputting the bypassed audio data through a speaker provided in the transmitter after the predetermined delay time has elapsed.

In the video reproducing method according to the present invention, the synchronizing step preferably obtains in real time a delay time T _T between the audio timing information bypassed by the encoder of the transmitter and the timing information of the audio transmitted from the decoder of the receiver. Doing; And delaying reproduction of the audio data bypassed by the delay time T _T.

In the moving picture reproduction method according to the present invention, the timing information is preferably SCR or PCR.

In the video playback method according to the present invention, the synchronizing step preferably obtains in real time a delay time T _T between the audio timing information bypassed by the encoder of the transmitter and the timing information of the audio transmitted from the decoder of the receiver. Doing; Obtaining a correction delay time T _c according to the following equation from the delay time T _T obtained in real time; And delaying reproduction of the audio data bypassed by the delay time T _C.

T _c = (B / (1 + B)) T _T + A / (1 + B)

Where B = (time it takes the encoder to send the packet to the decoder) / (time it takes the decoder to send the timing information to the encoder),

A is the sum of the times the packet stays in the receiver's buffer and decoder,

T _T is a delay time between the audio timing information bypassed by the encoder of the transmitter and the timing information of audio transmitted from the decoder of the receiver.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

2 is a block diagram of a video reproducing apparatus according to the present invention, and a device for reproducing audio at a transmitter and a video at a receiver is disclosed. In the above scheme, the reproduction of the audio signal must be delayed for a certain time in order to synchronize the video reproduced at the receiver with the audio reproduced at the transmitter.

Referring to Fig. 2, the transmitter is configured of an audio delay controller 16 in the configuration of a transmitter network 15 such as a tuner 11, an ADC for video signals 12, an ADC 13 for audio signals, an encoder 14, and a wireless LAN. And a speaker 17, and the receiver includes a receiver network 18, such as a wireless LAN, a buffer 19, a decoder 20, a display controller 21, and a display device 22 such as an LCD.

Referring to FIG. 2, the video reproducing apparatus according to the present invention converts analog video and audio signals received from the tuner 11 into digital signals through respective ADCs 12 and 13, and converts them. The received signal is encoded through an encoder 14 such as MPEG2 and transmitted to the receiver network 18 through a transmitter network 15 such as a wireless LAN. At this time, the received video and audio signals are temporarily stored in the buffer 19 and then decoded by the decoder 20 such as MPEG2 so that the video signals are output to the display apparatus 12 such as LCD through the video controller 21. The audio signal is reproduced through the transmitter speaker 17, not the receiver.

The audio signal includes audio data and audio timing information. At this time, the audio timing information may vary depending on the video encoding method. However, assuming that the video method is MPEG2, the stream encoded by the encoder is usually a PS (Program Stream) or a TS (Transport Stream). Each of these streams has 42 bytes of timing information (Time Stamp) for timing adjustment called SCR (System Clock Reference) and PCR (Program Clock Reference). In the present invention, the above-described PCR or SCR is preferably used as timing information, and these information are decoded by the decoder 20 of the receiver and then transmitted to the transmitter through the network 18, and the audio delay is transmitted through the transmitter network 15. It is input to the controller 16.

In addition, the transmitter bypasses the digital signal converted by the audio ADC 13 as an undecoded signal by the decoder 14 and inputs the same to the audio delay controller 16.

The audio delay controller 16 compares the bypassed audio timing information with the audio timing information decoded and transmitted by the decoder 20 of the receiver, and synchronizes the video signal at the receiver and the audio signal at the transmitter to transmit audio. Playback is performed on the speaker 17. This synchronization process in the audio delay controller 16 requires some algorithm, which will be described in more detail below with reference to FIG. The data input / output function performed in relation to other devices of the audio delay controller 16 as described above, and the implementation of the internal algorithm for the synchronization process to be described below are simple for those skilled in the art through software or / and hardware combination. It can be implemented.

Figure 3 shows a video and audio data path diagram of the video playback apparatus according to the present invention. In order to synchronize the audio signal with the video signal, the playback time of the bypassed audio data must be delayed for a predetermined time. Hereinafter, the delay time of the audio signal will be described with reference to FIG. 3.

The reproduction of the bypassed audio signal needs to be delayed by the arrival time of the timing information (PCR or SCR) to be decoded and transmitted from the receiver. When the signal encoded and transmitted to the receiver is decoded, and the total delay time for the decoded timing information to reach the audio delay controller 16 of the transmitter is defined as T _T , T _T is used to reproduce the encoded audio and video. T _N1 , which is the time required in the transmitter network 15, T _N2 , which is the time required in the receiver network 18, T _B , which is the time required in the receiver buffer 19, and the receiver decoder 20, Duration of the may be represented as the sum of sum T _{D T N1 + T N2 + T B} + T D , and the travel time to an audio delay controller 16 of the decoded timing information T _N3 + _N4 of T.

That is, the total delay time is T _T = T _N1 + T _N2 + T _B + T _D + T _N3 + T _N4 (1)

Can be represented as Here, the total delay time T _T is a time that can be measured by SCR or PCR, which is timing information using a real time timer, and T _N1 , T _N2 , T _N3 , T _N4 is a system dependent element, It can be assumed as a variable that can vary with state. If T _N3 + T _N4 , which is the time taken by the decoder 20 to transmit timing information to the encoder 14, is extremely small, the reproduction of the bypassed audio signal is delayed by the total delay time T _T. In addition, there is no big problem in reproducing and synchronizing the video signal.

However, when the T _N3 + T _N4 has a significant scalar amount of time depending on the system or network condition, the delay time correction is required. At this time, if the correction time for the total delay time is defined as T _C , T _C is the time taken to transmit timing information from the decoder 20 to the encoder 14 at the total delay time T _T (T _N3 + T _N4). ) Should be reduced.

Therefore, the corrected delay time is T _C = T _T- (T _N3 + T _N4 ) (2)

It becomes

If T _B + T _D is defined as a constant A in the formula (1), the formula (1) is modified as follows.

T _N1 + T _N2 + T _N3 + T _N4 = T _T -A (3)

In this equation, T _N1 + T _N2 is the time taken by the encoder 14 to transmit the audio signal packet to the decoder 20, and T _N3 + T _N4 transmits the timing signal from the decoder 20. As the time taken, if the ratio of the two is defined as B, the following equation (4) can be defined.

T _N1 + T _N2 = B (T _N3 + T _N4 ) (4)

The following formula (5) can be obtained by the above formulas (3) and (4).

T _N3 + T _N4 = (T _T -A) / (1 + B) (5)

Therefore, the corrected delay time T _C is expressed by the following formula (6) by the formulas (2) and (5).

T _C = T _T- (T _N3 + T _N4 ) = T _T- (T _T -A) / (1 + B) = (B / (1 + B)) T _T + A / (1 + B) ( 6)

In Equation (6), A and B are constants calculated in advance by experiment or setting, and since T _T is a value measured every time of reproduction, the correction delay time T _C can be determined by Equation (6). .

As described above, the video apparatus and the method of playing a video according to the present invention have been described as an example in which a tuner is mounted. It will be easy to understand.

In addition, according to the method of playing a video according to the present invention, it can be easily understood that the same applies to the case of playing a file of a general video.

According to the present invention, by reproducing the audio in the transmitting unit, the audio output may be deteriorated, which may be caused by low output and poor characteristics of the receiver speaker, which is a conventional small device, and a separate line output may be used to secure high output and high sound quality. The effect is that the speaker wires can be removed.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that it can be changed.

1 is a block diagram of a conventional video playback apparatus using a network

2 is a block diagram of a video player according to the present invention

3 is a video and audio data path diagram of a video player according to the present invention;

Claims (8)

A video player comprising: a transmitter for encoding a video analog signal into a digital signal and transmitting the same through a network; and a receiver for receiving an encoded signal from the transmitter, decoding the same, and playing a video. The transmitting unit includes a speaker for outputting audio, and an audio delay controller for outputting the audio data to the speaker provided in the transmitting unit by synchronizing audio data bypassed by the encoder of the transmitting unit and video data reproduced in the receiving unit. Video player The apparatus of claim 1, wherein the timing information used for synchronization is SCR or PCR. The timer according to claim 1 or 2, further comprising a timer for checking in real time a delay time (T _T ) between audio timing information bypassed by an encoder of a transmitter and timing information of audio transmitted from a decoder of a receiver. And an audio delay controller for delaying a playback time of the bypassed audio data by a delay time obtained from a timer. The timer of claim 1, wherein the audio delay controller checks in real time a delay time T _T between audio timing information bypassed by an encoder of a transmitter and timing information of audio transmitted from a decoder of a receiver. And an audio delay delaying the reproduction of the audio data bypassed by the correction delay time by obtaining a correction delay time T _c according to the following equation from a delay time T _T obtained in real time by the timer. Video playback device comprising a controller T _c = (B / (1 + B)) T _T + A / (1 + B) Where B = (time it takes the encoder to send the packet to the decoder) / (time it takes the decoder to send the timing information to the encoder), A is the sum of the times the packet stays in the receiver's buffer and decoder, T _T is a delay time between the audio timing information bypassed by the encoder of the transmitter and the timing information of audio transmitted from the decoder of the receiver. In the transmitting unit encodes a video analog signal into a digital signal and transmits it to a receiving unit through a network, and the receiving unit receives the encoded signal from the transmitting unit and decodes it and then reproduces the video. Bypassing audio data at an encoder of a transmitter; Delaying reproduction of the bypassed audio data by a predetermined time and synchronizing with reproduction of video data at a receiving unit; And And outputting the bypassed audio data through a speaker provided in the transmitter after the predetermined delay time has elapsed. 6. The method of claim 5, wherein the synchronizing step comprises: obtaining a delay time T _T between audio timing information bypassed by an encoder of a transmitter and timing information of audio transmitted from a decoder of a receiver; Delaying playback of the audio data bypassed by the delay time (T _T ). The method of claim 6, wherein the timing information is SCR or PCR. 6. The method of claim 5, wherein the synchronizing step comprises: obtaining a delay time T _T between audio timing information bypassed by an encoder of a transmitter and timing information of audio transmitted from a decoder of a receiver; Obtaining a correction delay time T _c according to the following equation from the delay time T _T obtained in real time; And delaying reproduction of the audio data bypassed by the delay time T _C. T _c = (B / (1 + B)) T _T + A / (1 + B) Where B = (time it takes the encoder to send the packet to the decoder) / (time it takes the decoder to send the timing information to the encoder), A is the sum of the times the packet stays in the receiver's buffer and decoder, T _T is a delay time between the audio timing information bypassed by the encoder of the transmitter and the timing information of audio transmitted from the decoder of the receiver.