KR100762649B1 - Method for setting volume automatically in digital broadcasting receiving apparatus and system thereof - Google Patents

Abstract

A method for automatically setting volume in a digital broadcasting receiver and a system therefor are provided to solve inconvenience that a user adjusts the volume by volume difference between channels. Digital broadcasting devices(101,103,105) broadcast reference volume signals which are standard for setting the volume of a digital broadcasting program. A digital broadcasting receiving terminal(109) receives the respective reference volume signals from the digital broadcasting devices(101,103,105), and sets the reference volume signal with the minimum amplitude as a representative reference volume signal. The digital broadcasting receiving terminal(109) attenuates the amplitude of a broadcasting program audio signal according to a volume attenuation ratio which is a ratio between the amplitude of the broadcasting program audio signal of a channel selected by a user and the amplitude of the representative reference volume signal, corrects the volume of the broadcasting program audio signal according to a predetermined output volume level, and outputs the corrected audio signal.

Description

METHOD FOR SETTING VOLUME AUTOMATICALLY IN DIGITAL BROADCASTING RECEIVING APPARATUS AND SYSTEM THEREOF}

1 is a digital broadcast processing system diagram according to an embodiment of the present invention;

2 is a diagram illustrating a service delivery structure of a digital multimedia broadcasting (DMB) system;

3 is a block diagram of a digital broadcast receiving terminal according to an embodiment of the present invention;

4 is a flowchart illustrating a process of setting a representative reference volume signal of a digital broadcast receiving terminal according to an embodiment of the present invention;

5 is a flowchart illustrating a volume attenuation process of a digital broadcast receiving terminal according to an embodiment of the present invention;

6 is a diagram illustrating audio signal attenuation according to a preferred embodiment of the present invention.

The present invention relates to digital broadcasting, and more particularly, to a method and system for adjusting a volume of a digital broadcasting channel by a digital broadcasting receiving terminal.

In general, digital broadcasting is to digitally transmit a broadcast signal that has been transmitted in an analog manner in order to provide a user with high quality, high sound quality, and more various services. Such digital broadcasting methods include various types such as Digital Video Broadcasting-Terrestrial (DVB-T), Digital Audio Broadcasting (DAB), Digital Multimedia Broadcasting (DMB), MediaFLO, and Digital Video Broadcasting-Handheld (DVB-H).

These various types of digital broadcasting methods generally provide one digital broadcaster by one broadcaster or a plurality of digital broadcasters by different broadcasters. For example, in the satellite DMB broadcasting system, one broadcaster (now: TU) provides digital broadcasting. In the terrestrial DMB broadcasting system, a plurality of broadcasting providers such as MBC, KBS, and SBS provide different digital broadcasting. However, in a digital broadcasting apparatus in which a plurality of broadcasters provide different digital broadcasts, broadcasters transmit audio volumes according to the standards of each broadcaster. Therefore, when the user of the digital broadcast receiving terminal moves the channel, especially when the broadcaster of the present channel and the mobile channel is different, there is a problem that the volume of audio suddenly increases. In addition, when the user moves the channel, there is a problem that the volume should be adjusted due to the volume difference between the channels.

Accordingly, the present invention provides a method and system for constantly adjusting the volume when a digital broadcasting receiver performs digital broadcasting.

The present invention also provides a method and system that eliminates the inconvenience of adjusting the user volume due to the volume difference between channels.

In order to solve the above problems, in the automatic volume setting system of a digital broadcasting receiving terminal, digital broadcasting apparatuses for broadcasting a reference volume signal which is a reference for setting the volume of a digital broadcasting program, and from the digital broadcasting apparatuses, respectively. Receives the reference volume signal of and sets the reference volume signal having the smallest amplitude as the representative reference volume signal, and adjusts the volume attenuation ratio that is the ratio of the amplitude of the broadcast program audio signal of the channel selected by the user to the amplitude of the representative reference volume signal. And the digital broadcast receiving terminal for attenuating the amplitude of the audio signal and correcting and outputting the volume of the audio signal according to a preset output volume level.

In order to solve the above problems, in the automatic volume setting method of the digital broadcasting receiving terminal, the digital broadcasting apparatus broadcasts a reference volume signal which is a reference for setting the volume of the digital broadcasting program, and the digital broadcasting receiving terminal broadcasts the digital signal. Receiving each reference volume signal from the broadcasting apparatus, the reference volume signal having the minimum amplitude is set as the representative reference volume signal, and the amplitude of the amplitude of the broadcast program audio signal of the channel selected by the user and the amplitude of the representative reference volume signal The amplitude of the audio signal is attenuated according to the non-volume attenuation ratio, and then the volume of the audio signal is corrected and output according to a preset output volume level.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

In the present invention, at least two broadcasters must provide different broadcast contents. This digital broadcasting system will be described with reference to FIG.

1 is a diagram illustrating a digital broadcast processing system according to a preferred embodiment of the present invention. A configuration of a digital broadcast system will be described with reference to FIG. 1.

The digital broadcasting system includes a first digital broadcasting apparatus 101, a second digital broadcasting apparatus 103, a third digital broadcasting apparatus 105, a broadcasting communication network 107, and a digital broadcasting receiving terminal 109.

The first digital broadcasting apparatus 101, the second digital broadcasting apparatus 103, and the third digital broadcasting apparatus 105 are broadcasting apparatuses of different broadcasting companies, respectively. The digital broadcasting apparatuses 101, 103, and 105 broadcast a transport stream for providing a digital broadcasting service, and also broadcast different reference volume signals.

The reference volume signal is a signal provided by each digital broadcasting apparatus 101 and indicates a reference volume level provided by each digital broadcasting apparatus 101. That is, the digital broadcasting apparatus 101 converts the volume in accordance with a predetermined audio volume standard when providing a broadcast. The digital broadcasting apparatus 101 analogizes the audio volume reference to generate a reference volume signal in which amplitude and frequency are repeated. For example, the reference volume signal may be a sine wave in which the same amplitude and frequency are repeated, such as the 501 waveform.

However, since the amplitude of the reference volume signal represents the reference volume, the frequencies are the same but the amplitudes are different for each of the digital broadcasting apparatuses 101, 103, and 105. For example, when the reference volume signal amplitude of the first digital broadcast apparatus 101 is '1', the reference volume signal amplitude of the second digital broadcast apparatus 103 may be '1.5', and the third digital The reference volume signal amplitude of the broadcast apparatus 105 may be '2'. As such, the digital broadcast apparatuses 101, 103, and 105 broadcast the reference volume signals having different amplitudes and the same frequency.

For example, in a terrestrial digital multimedia broadcasting (DMB) method, a first method of broadcasting a reference volume signal, the digital broadcasting apparatus 101 transmits an MPEG-2 (MPEG-2: Moving Picture Expert Group-2) transport stream ( Transport Stream) In addition to the stuffing data of the packet, the reference volume signal data may be included and broadcasted. In more detail, The data capacity of a transport stream packet is standardized to 188 bytes. In other words, when generating the transport stream packet, the digital broadcasting apparatus 101 should generate all the transport stream packets to 188 bytes. At this time, the digital broadcasting apparatus 101 inserts meaningless data called stuffing data as much as necessary to fill 188 bytes. Therefore, the reference volume signal data can be inserted in place of this stuffing data.

In a second method, the digital broadcasting apparatus 101 may broadcast reference volume signal data through one channel of the audio service 201. Referring to FIG. 2, the digital broadcast apparatus 101 may provide an audio service 201, a data service 203, and a broadcast service. The digital broadcasting apparatus 101 provides at least one channel for each service. The digital broadcasting apparatus 101 generates a transport stream packet with audio data for the audio service 201. Therefore, the digital broadcasting apparatus 101 may designate a channel for broadcasting the reference volume signal data and broadcast the reference volume signal data.

In a third method, the digital broadcasting apparatus 101 may broadcast reference volume signal data through one channel of the data service 203. The digital broadcasting apparatus 101 may designate a channel for broadcasting the reference volume signal data and broadcast the reference volume signal data.

In the present invention, the reference sound signal data is broadcast due to the above-described method. The reference sound signal data may also be broadcast by methods other than the present embodiment.

 So far, the digital broadcasting apparatus 101 has been described how to broadcast the reference volume signal. Now, the configuration and operation of the digital broadcast receiving terminal 109 for receiving the reference volume signal will be described.

3 is a block diagram of a digital broadcast receiving terminal 109 according to an embodiment of the present invention. The configuration of the digital broadcast receiving terminal 109 will be described with reference to FIGS. 1 to 3.

The digital broadcast receiver 303 performs a function of wirelessly receiving a transport stream packet broadcast from the digital broadcast apparatus 101. In particular, in the present invention, when the volume automatic adjustment is requested by the user, the digital broadcasting receiver 303 receives a transport stream packet including reference volume signal data.

The digital broadcast processor 305 analyzes the received transport stream packet to perform the service requested by the user. For example, the digital broadcast processor 305 requests a broadcast service by a user, selects a channel, extracts audio frame and video frame information from the received transport stream packets, and outputs the extracted audio frame and video frame information to the controller 301.

In particular, in the present invention, the digital broadcast processor 305 extracts the reference volume signal data by analyzing a transport stream packet including the reference volume signal data.

The sound processor 307 converts the voice signal output from the controller 301 into an audible sound, and amplifies or attenuates the output sound level according to a user input.

The key input unit 309 is composed of keys for receiving digital broadcasting and function keys for various functions. The key input unit 309 generates a key signal corresponding to a key pressed by the user and outputs the key signal to the controller 301.

The memory unit 311 stores data necessary for controlling the mobile terminal. In particular, the present invention stores the volume reduction ratio calculated by the controller 301.

The display unit 313 displays the current state of the digital broadcast receiver terminal and the operating state of the digital broadcast receiver terminal under the control of the controller 301, and also displays an image. Generally, it can be composed of Liquid Crystal Display (LCD) and Organic Light Emitting Diodes (OLED).

The controller 301 controls each part of the terrestrial DMB receiving terminal to perform a digital multimedia broadcasting service. Particularly, in the present invention, when the volume control is automatically requested by the user, the controller 301 receives the reference volume signal data from each of the digital broadcasting apparatuses 101, 103, and 105, and among them, the representative reference volume having the smallest amplitude. Detect signal data. The controller 301 calculates volume reduction ratios of all digital broadcasting channels based on the representative reference volume signal and stores them in correspondence with each digital broadcasting channel.

Subsequently, when the digital broadcast is requested by the user and the channel is selected, the volume signal data of the corresponding channel is attenuated by applying the stored volume reduction ratio.

 The configuration of the digital receiving terminal has been described with reference to FIG. 3. 4 and 5, the operation of the digital broadcast receiving terminal will now be described.

4 is a flowchart illustrating a representative reference volume signal setting of a digital broadcast receiving terminal according to an exemplary embodiment of the present invention. A process of selecting a representative reference volume signal and designating a representative reference volume signal by the digital broadcast receiving terminal will be described with reference to FIGS. 1 to 4.

If the volume control is requested by the user in step 401, the control unit 301 proceeds to step 403. In step 403, the controller 301 receives reference volume signal data from the digital broadcasting apparatuses 101, 103, and 105. There are various ways in which the digital broadcasting apparatus 101 broadcasts the reference volume signal data. In the present invention, a method of inserting and broadcasting the reference volume signal data in place of the stuffing data of the transport stream packet and broadcasting the audio signal. As an example, a method of broadcasting reference volume signal data on one channel of a service or data service is given. Therefore, the controller 301 of the digital broadcast receiving terminal may receive the reference volume signal data broadcast by the digital broadcast apparatus 101. In step 405, the controller 301 detects the reference volume signal data having the smallest amplitude among the received reference volume signal data of each digital broadcasting apparatus, and sets and stores the detected reference volume signal data as the representative reference volume signal data. Since the reference volume signal data is digital, the controller 301 analogizes the reference volume signal data. The controller 301 calculates amplitudes of the analogized reference volume signals, detects the reference volume signal having the minimum amplitude, and sets the representative reference volume signal. When the amplitude of the reference volume signals is calculated, the controller 301 may calculate the amplitude of the reference volume signal data using a Fast Fourier Transform (FFT).

A process of setting the representative reference volume signal of the present invention has been described with reference to FIG. 4. Now, the volume attenuation flow of the digital broadcast receiving terminal will be described with reference to FIG. 5.

When the digital broadcast is requested by the user and the channel is selected in step 501, the controller 301 receives a transport stream packet for providing the digital broadcast service. In step 503, the controller 301 generates audio signal data from the transport stream packets. The controller 301 analogizes the audio signal data and calculates an amplitude of the audio signal using a fast Fourier transform (FFT). The controller 301 calculates a ratio of the amplitude of the audio signal and the amplitude of the representative reference volume signal, that is, the volume attenuation ratio.

The process of obtaining the volume reduction ratio will be described further with reference to FIG. 6, and assume that the 601 waveform is an example of the representative reference volume signal. The amplitude is '1' and the frequency is 1 kHz. The 603 waveform is an embodiment of the audio signal of the channel selected by the user. For the purpose of understanding the present invention, the amplitude is arbitrarily changed and the frequency is assumed to be 1 kHz. Although the amplitude varies arbitrarily, it is assumed that the amplitude of the first sine wave is '2' as shown in the 603 waveform. The 605 waveform calculates the volume attenuation ratio of the above two waveforms. The first amplitude of the 603 waveform is '2' and the amplitude attenuation ratio is '2' since the amplitude of the 601 waveform is '1'.

Returning to FIG. 5 again, in step 505, the controller 301 proceeds to step 507 when the volume reduction ratio is greater than '1', and proceeds to step 509 when the volume reduction ratio is '1' or less. In step 507, the controller 301 attenuates the amplitude of the audio signal by the volume reduction ratio and outputs the same to the sound processor. For example, when the amplitude of the audio signal is equal to the 603 waveform of FIG. 6 and the volume reduction ratio is calculated as '2', the controller 301 attenuates the amplitude of the 603 waveform by 1/2 to generate a 607 waveform. In step 509, the controller 301 outputs the audio signal to the sound processor 307 as it is. The sound processor 307 amplifies or attenuates the input audio signal according to a preset output volume level and outputs the amplified audio signal to the speaker. The preset output volume level is an output volume level set in the digital broadcasting reception terminal itself, and is a value adjusted according to user selection. If a channel other than the current channel is selected by the user in step 511, the controller 301 proceeds to step 503 to readjust the volume. If no other channel is selected by the user, the controller 301 proceeds to step 513. In step 513, if the digital broadcast is requested to be terminated by the user, the controller 301 proceeds to step 515 to terminate the digital broadcast. If the digital broadcast is not requested by the user, the controller 301 proceeds to step 517 to perform a function requested by the user, and proceeds to step 511 to check whether another channel is requested by the user.

Due to this process, the audio signal of the channel for which digital broadcasting is requested by the user can be adjusted to a predetermined size or less, thereby preventing a sudden increase in volume when the channel is changed.

In the foregoing description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. For example, in the embodiment of the present invention, the volume may be adjusted when the digital broadcasting service is selected, but the volume may also be adjusted when the various audio services are selected. Thus, the scope of the present invention is not defined by the described embodiments, but the claims In addition, it should be determined by the claims and their equivalents.

As described above, according to the present invention, a digital broadcasting receiver terminal can provide a method and system for constantly adjusting the volume when performing digital broadcasting, and eliminates the trouble of adjusting the user volume due to the volume difference between channels. Methods and systems can be provided.

Claims (8)

In the volume automatic setting system of the digital broadcast receiving terminal, Digital broadcasting apparatuses for broadcasting a reference volume signal which is a standard for setting a volume of a digital broadcasting program; Receiving each reference volume signal from the digital broadcasting apparatuses, the reference volume signal having the minimum amplitude is set as the representative reference volume signal, and the amplitude of the broadcast program audio signal of the channel selected by the user and the representative reference volume signal And a digital broadcasting receiver terminal which attenuates the amplitude of the audio signal according to a volume attenuation ratio which is a ratio of amplitude and then corrects and outputs the volume of the audio signal according to a preset output volume level. . The method of claim 1, When the volume reduction ratio exceeds 1, the digital broadcast receiving terminal attenuates and outputs the amplitude of the audio signal with reference to the volume reduction ratio, and when the volume reduction ratio is 1 or less, the amplitude of the audio signal remains unchanged. Volume automatic setting system characterized by the output bin. In the automatic volume setting method of the digital broadcast receiving terminal, The digital broadcasting apparatus includes a broadcasting step of broadcasting a reference volume signal which is a reference for setting the volume of the digital broadcasting program; A setting step of receiving, by the digital broadcasting receiver terminal, each reference volume signal from the digital broadcasting apparatuses, and setting a reference volume signal having a minimum amplitude as a representative reference volume signal; The amplitude of the audio signal is attenuated according to a volume attenuation ratio which is a ratio of the amplitude of the broadcast program audio signal of the channel selected by the user and the amplitude of the representative reference volume signal, and then the volume of the audio signal is adjusted according to a preset output volume level. Automatic volume setting method characterized in that it comprises an output step of correcting and outputting. The method of claim 3, The output step may include: a first output step of attenuating and outputting an amplitude of the audio signal with reference to the volume reduction ratio when the volume reduction ratio exceeds 1; And a second output step of outputting the amplitude of the audio signal as it is when the volume attenuation ratio is 1 or less. In the automatic volume setting method of the digital broadcast receiving terminal, A setting step of receiving reference volume signals, the reference volume signals for setting the volume of a digital broadcasting program, from the digital broadcasting apparatuses, detecting a reference volume signal with a minimum amplitude, and setting the detected reference volume signal as a representative reference volume signal; A calculation step of calculating the amplitude of the broadcast program audio signal of the channel selected by the user and the amplitude of the representative reference volume signal; And attenuating the amplitude of the audio signal according to a volume attenuation ratio that is an amplitude ratio of the amplitude of the audio signal and the representative reference volume signal, and then correcting and outputting the volume of the audio signal according to a preset output volume level. Volume automatic setting method characterized in that. The method of claim 5, The output step may include: a first output step of attenuating and outputting an amplitude of the audio signal with reference to the volume reduction ratio when the volume reduction ratio exceeds 1; And a second output step of outputting the amplitude of the audio signal as it is when the volume attenuation ratio is 1 or less. The method of claim 5, And in the setting step, when the reference sound signals are received to detect the reference sound signal having the smallest amplitude, the amplitude is calculated using a Fast Fourier Transform (FFT). The method of claim 5, And in the calculating step, calculates the amplitude of the audio signal and the amplitude of a representative reference volume signal by fast Fourier transform.

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