KR20070023411A - Control apparatus and method for automatic volume level of digital broadcasting system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for automatically adjusting the volume level of a digital broadcasting system, in which the audio output level that is different for each broadcast program can be constantly adjusted according to the recording level generated during the broadcasting production.

According to another aspect of the present invention, there is provided a method for automatically adjusting a volume level in a digital broadcasting system, the method comprising: encoding and transmitting a recording level of an broadcast program, an audio and a video signal; Decoding and playing the transmitted audio and video signals, and decoding and detecting a recording level of the broadcast program; And adjusting the gain of the audio output level according to the detected recording level of the broadcast program.

Digital TV, recording level, volume level

Description

Control apparatus and method for automatic volume level of digital broadcasting system

1 is a schematic structural diagram of a digital broadcast transmission system according to an embodiment of the present invention.

Figure 2 is a block diagram showing an automatic volume level control device of the digital TV according to the present invention.

3 is a flow chart illustrating a method for automatically adjusting the volume of a digital TV system according to the present invention.

4 is a flowchart illustrating an automatic volume control method of a digital TV system according to an exemplary embodiment of the present invention.

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

110 ... Video Encoder 120 ... Voice Encoder

130 ... Additional Data Encoder 140 ... Recording Level Insert

150 ... multiplexer 160 ... modulator

170 Transmitter 210 Tuner

220 Demodulator 230 Demultiplexer

240.Video decoder 250.Display unit

260 Audio decoder 270 Audio processing unit

280 ... speaker 290 ... data decoder

300 ... broadcasting information generator 310 ... recording level detector

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for automatically adjusting the volume level of a digital broadcasting system, in which the audio output level that is different for each broadcast program can be constantly adjusted according to the recording level generated during the broadcasting production.

In the digital TV broadcasting system, a digital TV broadcasting signal is compressed into a single packet by compressing audio and video data using a compression algorithm, for example, a Dolby AC-3 audio compression encoding algorithm or an MPEG-2 video compression algorithm. It is carried on a carrier in the form of a transport stream (TS) multiplexed on the extracted bit stream.

On the other hand, a receiver of a digital TV separates audio data and video data from a transport stream transmitted from a transmission side, and then provides them to corresponding audio and video decoders to restore original compressed audio and video signals. . At this time, the receiver of the digital TV is automatically tuned to the carrier including the program of the selected channel based on the control data included in the packetized transport stream, and then the program of the channel selected from the transport stream multiplexed and transmitted. By demultiplexing and reconstructing only information, program information is provided to viewers.

In the case of analog broadcasting, the channel number of the VHF band is assigned to a specific broadcasting station, so the channel number and broadcasting station name are exactly the same.However, the transmission of digital broadcasting is basically based on the MPEG-2 Transport Stream standard. It is operated according to its own detailed specification.

In addition, since the channel number in the digital broadcast means a program number, the channel in the digital TV broadcast means one program, that is, an audio / video stream or an additional data service stream. It keeps changing.

The audio level of the digital TV broadcast transmitted by the broadcasting station is set differently for each broadcasting station and for each channel. Accordingly, a digital TV receiver requires a device that allows a user to always listen at the same level with respect to audio that is set differently in a broadcast stream.

In the conventional analog audio volume level (AVL) device, the average value of the input audio level is taken, and the gain is adjusted to approximate the desired reference value.

If the conventional analog automatic volume level technique is applied to a digital TV, there is a problem that an unwanted output occurs when the level change of the input voice is large.

According to the present invention, a transmitter inserts and transmits a recording level of a broadcast signal, and a receiver detects a recording level inserted into the broadcast signal and adjusts a gain of an audio amplification level according to the recording level. An apparatus and method for automatically adjusting the volume level of a digital broadcasting system is provided.

Automatic volume level control device in the digital broadcasting system according to the present invention for achieving the above object,

Means for transmitting a recording level of a current program when broadcasting;

Means for detecting the transmitted recording level for audio processing corresponding to a program to be reproduced upon broadcast reception;

And means for adjusting the gain of the audio output level of the corresponding program according to the detected recording level.

Preferably, the recording level of the current program is inserted into the network information table (NIT) of the program related information (PSI).

Preferably, the gain adjusting means increases the gain of the audio output level if the detected recording level is lower than the reference, and lowers the gain of the audio output level if the detected recording level is higher than the reference.

On the other hand, the automatic volume level adjustment method in a digital broadcasting system according to another embodiment of the present invention,

Encoding and transmitting the recording level of the broadcast program, the audio and video signals;

Decoding and playing the transmitted audio and video signals, and decoding and detecting a recording level of the broadcast program;

And adjusting the gain of the audio output level according to the detected recording level of the broadcast program.

Preferably, the recording level is included in a network information table of program related information.

Preferably, when the detected recording level is lower than the reference, the gain of the audio output level is increased, and when the detected recording level is higher than the reference, the gain of the audio output level is lowered.

Hereinafter, with reference to the accompanying drawings as follows.

1 is a block diagram schematically illustrating a transmission system of a digital TV according to the present invention, and FIG. 2 is a block diagram illustrating an automatic volume level control apparatus in a digital TV reception system.

Referring to FIG. 1, a transmission system includes a video encoder 110 for encoding video data, a voice encoder 120 for encoding audio data, a data encoder 130 for encoding additional data corresponding to broadcast information, A recording level insertion unit 140 for outputting the recording level of the voice data to the data encoder 130, a multiplexer 150 for multiplexing the encoded data, and a modulator 160 for modulating the multiplexed broadcast data. ) And a transmitter 170 for transmitting the modulated data.

The reception system includes one or more tuners 210 for receiving broadcast data, a demodulator 220 for demodulating the received broadcast data, and a demultiplexer 230 for demultiplexing the demodulated broadcast data into video, audio, and additional data. ), An image decoder 240 for decoding the demultiplexed image data and outputting the demultiplexed image data to the display unit 250, a voice decoder 260 for decoding and outputting the demultiplexed audio data, and the demultiplexed addition. A data decoder 270 for decoding data, a broadcast information generator 300 for generating and outputting electronic program information (EPG) using the decoded additional data, and a recording level for extracting a recording level from the additional data. The audio unit outputs the speaker 280 by adjusting the output level of the voice data according to the detector 310 and the recording level detected by the recording level detector 310. A configuration including a portion (270).

The automatic volume level adjusting device in the digital broadcasting system according to the present invention configured as described above will be described with reference to the accompanying drawings.

Referring to FIG. 1, in a digital broadcasting system, a transmission system encodes image data with an image encoder 110, encodes audio data with a voice encoder 120, and outputs the video and audio packets as video and audio transport packets (TPs). Done.

In addition, the data encoder 130 encodes additional service data necessary for broadcasting, that is, program designation information and additional information. Additional service data includes channel number, current time, program grade, mono / stereo, caption, voice multiplex, program name, program start / end time, program progress direction information, and the like. The supplementary service data is composed of program related tables, such as PMT, PAT, CAT, and NIT. The PMT is a program map table, the PAT is a program association table (PAT), the CAT is a conditional access table, and the NIT is a network information table. Here, a private stream may be transmitted to the network information table, and the recording level of the corresponding program is transmitted to the table. The recording level is transmitted in 8 bits, for example.

The program specific information (PSI) includes information required to perform a basic operation of the receiver, and includes a program association table (PAT), a conditional access table (CAT), a program management table (PMT), and the like. Is composed of practical information for program guidance, and this includes a network information table (NIT), a service description table (SDT), a time date table (TDT), and an event information table (EIT).

Here, the recording level inserting unit 140 outputs the recording level inserted when the camera is photographed by the broadcasting station to the data encoder 130 to be inserted into the network information table NIT. Accordingly, the actual recording level of the currently broadcast program is inserted into the network information table NIT.

As such, the audio, video, and additional service data are encoded in an MPEG scheme, multiplexed by the multiplexer 150, modulated by the modulator 160, and then transmitted through the transmitter 170. Here, the modulator 160 is modulated according to the terrestrial wave, cable, and satellite broadcasting method and then transmitted from the RF terminal of the transmitter 170.

Meanwhile, the reception system includes one or more tuners 210 to tune the channel selected by the user among the received broadcast signals. The demodulator 220 demodulates the tuned broadcast data according to a modulation method of a transmission system. That is, the demodulated data is modulated according to the modulation method of the terrestrial, cable, and satellite broadcasting methods. The demodulator 220 may be configured in a tuner.

The demultiplexer 230 demultiplexes the multiplexed data in the transmission system and outputs the image, audio, and additional service data.

The demultiplexed image data is decoded by the image decoder 240 and output to the display unit 250. The audio data is decoded by the audio decoder 260 and level-adjusted through the audio processor 270. 280). The additional service data is decoded by the data decoder 290 and output as PSI information and broadcast guide information. The PSI information and the broadcast guide information include information such as PMT, PAT, CAT, NIT, etc., which are processed into broadcast information by the broadcast information (EPG) generator 300 and then, if desired by the user, to the display unit 250. Is output.

Meanwhile, the recording level recorded in the network information table NIT decoded by the data decoder 290 is detected by the recording level detector 310, and the recording level detector 310 is connected to the recording level detector 310. The recording level of the current program detected by the output is output to the audio processor 270. Here, the recording level detection unit 310 is detectable by extracting the recording level (for example, 8 bits) of the corresponding program inserted into the network information table NIT in the transmission system.

At this time, the audio processor 270 adjusts and outputs a gain of the audio output level of the currently broadcast program set by the user according to the recording level detected by the recording level detector 310. That is, if the recording level is low, the gain of the audio output level is increased, and if the recording level is high, the gain of the audio output level is decreased. Here, the gain increase or decrease according to the recording level is determined by the recording level reference value, the recording level reference value may be a value set by the system or a value defined by the user. For example, the recording level reference value may take level 5, which is an intermediate value when the total recording level size is 10.

3 is a flowchart illustrating an automatic recording level adjusting method according to the present invention.

Referring to FIG. 3, when recording a camera set by a transmission system, a recording level corresponding to the program and a voice volume level set by the user are detected respectively (S101).

Then, the detected recording level is compared with a preset reference value (S103). In this case, when the recording level is larger than the reference value, since the recording level is relatively large, the gain of the voice output volume level is lowered using a gain attenuation coefficient (S105). Here, lowering the gain can be solved by multiplying the gain attenuation coefficient and the voice output volume level by a previously set gain value.

When the recording level is smaller than the reference value, the recording level is relatively small, so that the gain of the voice output volume level is increased by using a gain amplification factor (S107). Here, increasing the gain can be solved by multiplying the gain amplification coefficient by the previously set gain value by the voice output volume level.

The gain attenuation coefficient and the gain amplification coefficient are preset constant values, and preferably have a value inversely proportional to the recording volume level relative to the reference value.

Then, the voice to which the gain of the adjusted voice output volume level is applied is output (S109). That is, the voice output volume is increased or decreased according to the increase or decrease of the gain value.

Here, when the recording level is equal to the reference value, the voice is output with the gain of the previous voice output volume level.

By automatically adjusting the audio output volume level of the receiver using the recording level in the camera photographing program as described above, the volume level desired by the user can be constantly output.

4 is a flowchart illustrating a method of automatically adjusting a volume level in a digital broadcasting system according to the present invention in more detail.

Referring to FIG. 4, when the recording level I and the input volume level vol are input to the receiving system (S111), the difference between the recording levels Diff subtracted from the preset reference value ref by the recording level I is Diff. = I-ref) is obtained (S113).

When the value of the recording level difference is compared with 0 (S115), if the value is greater than 0, the recording level is set to the first selection state (sel = 0) and the first gain value Gain0 is obtained. Here, the first gain value is obtained by multiplying the value obtained by dividing the gain attenuation coefficient x by the difference of the recording level Diff by the reference gain (ref_gain) (S117). Accordingly, the first total gain Total_Gain0 is obtained by multiplying the first gain Gain0 by the input volume vol (S119). That is, Gain0 = ref_gain * (x / Diff) is obtained, and Total_Gain0 = Gain0 * vo1.

However, as a result of the comparison of S115, if the difference Diff of the recording level is less than or equal to 0, the second selection state sel = 1 is set and the second gain value Gain1 is obtained (S121). Here, the second gain Gain1 is obtained by multiplying the gain amplification coefficient y by the difference in the recording level Diff by the reference gain value ref_gain. Here, the second gain value is obtained by multiplying the reference gain value by a value obtained by dividing the gain amplification coefficient y by the difference of the recording levels. Accordingly, the second total gain value is calculated by multiplying the second gain value by the input volume vol (S123). That is, Gain1 = ref_gain * (y / Diff), and Total_Gain1 = Gain1 * vo1.

In this way, when the first or second total gain value is obtained, the gain value becomes the total gain value, and by adjusting the audio output volume with this gain value (S125), the audio output level does not change according to the recording level and is constant. Can be output.

So far, the present invention has been described with reference to the preferred embodiments, and those skilled in the art to which the present invention pertains to the detailed description of the present invention and other forms of embodiments within the essential technical scope of the present invention. Could be implemented. Here, the essential technical scope of the present invention is shown in the claims, and all differences within the equivalent range will be construed as being included in the present invention.

According to the apparatus and method for automatically adjusting the volume level in the digital broadcasting system according to the present invention, after detecting the recording level of the broadcast program transmitted from the transmission system, the volume of the audio output volume level is automatically adjusted so that the volume is always constant. It is effective to maintain the level.

Claims (6)

Means for transmitting a recording level of a current program when broadcasting; Means for detecting the transmitted recording level for audio processing corresponding to a program to be reproduced upon broadcast reception; And a means for adjusting a gain for a sound output level of a corresponding program according to the detected recording level. The method of claim 1, And a recording level of the current program is included in a network information table (NIT) of program-related information (PSI). The method of claim 1, The gain adjusting means automatically increases the gain of the audio output level if the detected recording level is lower than the reference, and lowers the gain of the audio output level if the detected recording level is higher than the reference. Volume level control. Encoding and transmitting the recording level of the broadcast program, the audio and video signals; Decoding and playing the transmitted audio and video signals, and decoding and detecting a recording level of the broadcast program; And adjusting the gain of the audio output level according to the detected recording level of the broadcast program. The method of claim 4, wherein And the recording level is included in a network information table of program related information. The method of claim 4, wherein And if the detected recording level is lower than the reference, the gain of the audio output level is increased, and if the detected recording level is higher than the reference, the gain of the audio output level is lowered.

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