WO2014067206A1 - Procédé de commande automatique de volume de canal et terminal de télévision numérique - Google Patents

Procédé de commande automatique de volume de canal et terminal de télévision numérique Download PDF

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Publication number
WO2014067206A1
WO2014067206A1 PCT/CN2012/086009 CN2012086009W WO2014067206A1 WO 2014067206 A1 WO2014067206 A1 WO 2014067206A1 CN 2012086009 W CN2012086009 W CN 2012086009W WO 2014067206 A1 WO2014067206 A1 WO 2014067206A1
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WIPO (PCT)
Prior art keywords
audio data
target channel
duration
gain coefficient
volume gain
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PCT/CN2012/086009
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English (en)
Chinese (zh)
Inventor
叶新民
Original Assignee
深圳创维数字技术股份有限公司
深圳市创维软件有限公司
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Publication of WO2014067206A1 publication Critical patent/WO2014067206A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/439—Processing of audio elementary streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/439—Processing of audio elementary streams
    • H04N21/4394—Processing of audio elementary streams involving operations for analysing the audio stream, e.g. detecting features or characteristics in audio streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals

Definitions

  • the present invention relates to a digital television technology, and more particularly to a method for automatically controlling a channel volume and a digital television terminal. Background technique
  • a technical problem to be solved by embodiments of the present invention is to provide a method for automatically controlling channel volume and a digital television terminal. It can solve the problem that the digital TV terminal suddenly has a small volume when switching channels or switching programs, improving user experience and reducing production costs.
  • an embodiment of the present invention provides a method for automatically controlling a channel volume, including:
  • the performing the digital sampling of the T1 duration of the original audio data of the cached target channel includes: performing, by the buffered original audio data of the target channel, a digital sampling of the T1 duration; the determining according to the acoustic sound value Calculating the volume gain factor with the user-set loudness value includes:
  • the adjusting the original audio data of the target channel according to the volume gain coefficient comprises: adjusting all original audio data of the target channel according to the volume gain coefficient.
  • the performing the digital sampling of the T1 duration of the original audio data of the buffered target channel includes: performing periodic digital sampling of the T1 duration on the buffered original audio data of the target channel according to the T1 duration;
  • the calculating the volume gain coefficient according to the acoustic sound value and the preset loudness value of the user includes:
  • the adjusting the audio data of the target channel according to the volume gain coefficient comprises:
  • the digital sampling of the T1 duration also includes:
  • the information processing obtains an acoustic sound value, and calculates a volume gain coefficient corresponding to the target channel according to the sound sound value corresponding to the digital sample information of the T1 duration and the loudness value preset by the user, and updates the database.
  • the volume gain coefficient corresponding to the target channel adjusting all original audio data of the target channel according to the volume gain coefficient, and outputting the adjusted audio data of the target channel;
  • the reading is performed The volume gain coefficient corresponding to the target channel in the database, adjusting all original audio data of the target channel according to the volume gain coefficient, and outputting the adjusted audio data of the target channel.
  • the obtaining the acoustic sound value according to the digital sampling information processing of the T1 duration comprises: calculating a difference value between the sound sound value and the preset loudness value of the user; determining whether the difference value is allowed Within the range of values;
  • the step of calculating the volume gain coefficient based on the acoustic sound value and the user-set loudness value is performed.
  • the performing the digital sampling of the T1 duration of the original audio data of the cached target channel includes: performing the audio data according to an audio frequency range that the human ear can perceive and a sensitivity of the human ear to the audio frequency. Digital sampling of the duration of T1.
  • the adjusting the original audio data according to the volume gain coefficient includes:
  • an embodiment of the present invention provides a digital television terminal, including:
  • a sampling module configured to perform digital sampling of the T1 duration of the original audio data of the buffered target channel; and calculate a loudness module, configured to obtain an acoustic sound value according to the digital sampling information processing of the T1 duration; and calculate a coefficient module, configured to perform Calculating the volume gain coefficient by the sound loudness value and the preset loudness value of the user;
  • An adjustment module configured to adjust original audio data of the target channel according to the volume gain coefficient
  • an output module configured to output the adjusted audio data of the target channel.
  • the sampling module includes:
  • a first sampling unit configured to perform one of the original audio data of the cached target channel
  • the calculation coefficient module includes:
  • a first calculating unit configured to calculate, according to the acoustic sound value corresponding to the digital sampling information of the T1 duration and the loudness value preset by the user, a volume gain coefficient corresponding to the target channel;
  • the adjustment module includes:
  • a first adjusting unit configured to adjust all originals of the target channel according to the volume gain coefficient Audio data.
  • the sampling module includes:
  • a second sampling unit configured to perform periodic digital sampling of the T1 duration on the buffered original audio data in a period of the T1 duration
  • the calculation coefficient module includes:
  • a second calculating unit configured to calculate, according to the acoustic sound value corresponding to the digital sampling information of the T1 duration and the loudness value preset by the user, a volume gain coefficient corresponding to the digital sampling information of the T1 duration;
  • the adjustment module includes:
  • a second adjusting unit configured to adjust, according to the volume gain coefficient, original audio data of a T1 duration corresponding to the digital sampling information of the T1 duration of the target channel.
  • the digital television terminal further includes:
  • a first determining module configured to determine whether to read the volume gain coefficient corresponding to the target channel in the database
  • Updating the database module configured to notify the first sampling unit to perform digital sampling of the T1 duration on the original audio data of the cached target channel when it is determined not to read the volume gain coefficient corresponding to the target channel in the database
  • the notification calculation loudness value module obtains the acoustic sound value according to the digital sampling information processing of the T1 duration, and notifies the first calculating unit to calculate the sound loudness value corresponding to the digital sampling information of the T1 duration and the preset loudness value of the user.
  • a reading module configured to: when the volume gain coefficient corresponding to the target channel in the database is read, read the volume gain coefficient corresponding to the target channel in the database, and notify the first adjusting unit to The volume gain coefficient adjusts all original audio data of the target channel, and notifies the output module to output the adjusted audio data of the target channel.
  • the digital television terminal includes:
  • Calculating a difference value module configured to calculate a difference value between the sound loudness value and a preset loudness value of the user
  • a second determining module configured to determine whether the difference value is within a range of allowed difference values; When the difference value is not within the allowable difference value range, the notification calculation coefficient module calculates the volume gain coefficient according to the sound sound level value and a loudness value preset by the user.
  • the sampling module includes:
  • a frequency division unit configured to divide the audio frequency into a plurality of frequency bands according to an audio frequency range that the human ear can perceive and a sensitivity of the human ear to the audio frequency, and adopt different sampling rate pairs according to different frequency bands.
  • the original audio data is subjected to digital sampling of the T1 duration.
  • the adjustment module includes:
  • an amplitude adjustment unit configured to adjust an amplitude of the whole original audio data according to the volume gain coefficient or separately adjust an amplitude of original audio data of each of the frequency bands obtained by the dividing and to alias the adjusted audio data of each of the frequency bands .
  • the audio data buffered in the digital television terminal is digitally sampled according to the characteristics of the human ear's sensitivity to sound at different frequencies, and the volume gain coefficient is calculated, and the original audio data of the target channel is adjusted according to the volume gain coefficient.
  • the output of the actual audio data loudness is consistent with the user's preset loudness, which effectively solves the problem that the program volume suddenly becomes small when switching channels or switching programs, and the embodiment of the present invention is the existing existing digital television terminal equipment hardware.
  • the production cost of the digital television terminal having the function of the embodiment of the present invention is effectively reduced, and the embodiment of the present invention automatically
  • the program volume is adjusted to have the least impact on the human ear, which improves the user experience.
  • FIG. 1 is a schematic flow chart of a first embodiment of a method for automatically controlling channel volume according to the present invention
  • FIG. 2 is a schematic flow chart of a second embodiment of a method for automatically controlling channel volume according to the present invention
  • FIG. 3 is an automatic diagram of the present invention.
  • FIG. 4 is a schematic structural diagram of a first embodiment of a digital television terminal according to the present invention.
  • FIG. 5 is a schematic structural diagram of a second embodiment of a digital television terminal according to the present invention.
  • Figure 6 is a block diagram showing the structure of a third embodiment of a digital television terminal of the present invention. detailed description
  • the digital television terminal may be a device having a one-way or two-way digital television function, such as a digital television set top box and a digital television integrated machine.
  • a flow chart of a first embodiment of a method for automatically controlling channel volume is provided. As shown in FIG. 1 , a method for automatically controlling channel volume according to this embodiment includes the following steps:
  • S100 Perform digital sampling of the T1 duration on the original audio data of the buffered target channel.
  • the digital television terminal obtains the pre-decoded audio data of the target channel through a demultiplexer (DMUX), buffers the pre-decoded audio data in the digital television terminal, and pre-processes the audio data.
  • DMUX demultiplexer
  • the human ear has different sensitivity to the sound at each frequency, in order to adjust the volume of the program to the lowest impact on the human ear, different processing can be performed according to the audio data of different frequencies to reduce the volume of the program to the human ear. influences. Therefore, the digital sampling of the T1 duration can divide the audio frequency into multiple frequency bands according to the audio frequency range that the human ear can perceive and the sensitivity of the human ear to the audio frequency, and use different sampling rates according to different frequency bands to the T1 duration.
  • the audio data is digitally sampled.
  • the digital sampling for performing the T1 duration will employ two sampling methods in the present invention.
  • the first method is to perform digital sampling of a T1 duration
  • the second method is to periodically sample digital samples of a period of T1 duration
  • the method corresponds to two embodiments, and will be described in the following second embodiment and third embodiment.
  • the T1 duration can be referenced between the range of 20MS and 1S, and the duration of the T1 may be different for different applications.
  • the division of the audio frequency and the corresponding sampling frequency can be referred to the following table: Frequency (Hz) ⁇ 31.5 ⁇ 63 ⁇ 125 ⁇ 250 ⁇ 500 ⁇ 1000 ⁇ 2000 ⁇ 4000 4000 The minimum sampling rate above 63 125 250 500 1000 2000 4000 8000 16000
  • S101 Obtain an acoustic sound value according to the digital sampling information processing of the T1 duration.
  • the sound pressure data of each frequency band is obtained by integrating the sampled data of each frequency band sampled in step S100.
  • the obtained sound pressure data of each frequency band may be directly accumulated by the attenuation weighting process according to the difference of the frequency as the original loudness data of the audio data, and the attenuated data may be adjusted by the technician according to the actual situation.
  • S102 Calculate a volume gain coefficient according to the acoustic sound value and a loudness value preset by a user.
  • the preset loudness value of the user is used by the laboratory to test the standard loudness data corresponding to different volume levels through the standard audio signal and pre-stored in the database of the digital television terminal, for example: the volume 23 sound corresponds to a standard loudness data, and the volume 24 sounds correspond to another standard data. Different volume levels correspond to different standard loudness data. Different users choose different loudness to choose their own loudness.
  • the volume gain coefficient may be a quotient of the sound loudness value and a preset loudness value of the user.
  • adjusting the original audio data is adjusted audio data formed by adjusting the amplitude of the entire original audio data according to the volume gain coefficient or separately adjusting the amplitude of the audio data of each frequency band obtained by dividing and dividing the audio data of each frequency band.
  • the adjusted audio data amplitude may be a quotient of the original audio data amplitude and the volume gain coefficient.
  • the audio data of the adjusted target channel is output to the D/A module or the data of the adjusted target channel is transmitted to the peripheral through the digital channel, and then the peripheral is further D/A converted, and then the actual output is performed.
  • Program audio is further D/A converted
  • the digital audio signal is D/A converted, there are one or more stages. Zoom in and play out, because the frequency characteristics of the amplifier circuit are different, so the frequency characteristics can be taken into account when calculating the sound level, and the different weighted attenuation coefficients corresponding to different frequencies can be corrected.
  • the specific method can be the audio amplifier circuit. The digital audio amplitude-frequency characteristic curve before the input and the amplified digital audio amplitude-frequency characteristic curve are sampled and tested, and the difference is obtained, and the linear difference ratio of the sampling points is obtained to correct the weighted attenuation coefficient.
  • FIG. 2 is a schematic flow chart of a second embodiment of a method for automatically controlling channel volume according to the present invention. As shown in FIG. 2, a method for automatically controlling channel volume according to this embodiment includes the following steps:
  • step S201 Determine whether to read the volume gain coefficient corresponding to the target channel in the database. If the determination result is no, step S201 is performed. If the determination result is yes, step S207 is performed.
  • the step may be performed when the target channel is switched, and the digital television terminal system may pop the pop-up window or other manner to allow the user to select whether to read the volume gain coefficient corresponding to the target channel in the database, or further optional, the number
  • the television terminal system automatically determines whether the volume gain coefficient corresponding to the target channel is stored in the database. If the volume gain coefficient corresponding to the target channel is not stored, step S201 is performed, and if the volume gain coefficient corresponding to the target channel is stored, step S207 is performed.
  • S201 Perform a digital sampling of the T1 duration on the buffered original audio data of the target channel.
  • the digital sampling of the T1 duration can divide the audio frequency into multiple frequency bands according to the audio frequency range that the human ear can perceive and the sensitivity of the human ear to the audio frequency, and use different sampling rates according to different frequency bands to the T1 duration.
  • the audio data is digitally sampled.
  • the sampling method used in the present embodiment to perform digital sampling of the T1 duration is to perform digital sampling of a T1 duration.
  • the T1 duration can be referenced between the range of 20MS and 1S, and the duration of the T1 may be different for different applications.
  • the division of the audio frequency and the corresponding sampling frequency can be referred to the following table.
  • Frequency (Hz) ⁇ 31.5 ⁇ 63 ⁇ 125 ⁇ 250 ⁇ 500 ⁇ 1000 ⁇ 2000 ⁇ 4000 4000
  • S203 Calculate a difference value between the acoustic sound value and the preset loudness value of the user.
  • the difference value is an absolute value of the difference between the acoustic loudness value and the user-set loudness value.
  • step S204 Determine whether the difference value is within a range of allowed difference values. If the determination result is no, step S205 is performed.
  • all the audio data of the target channel is output without pre-processing, that is, all the original audio data of the target channel is output.
  • the allowed difference value range is greater than or equal to Odb and less than or equal to 2db.
  • S205 Calculate a volume gain coefficient corresponding to the target channel according to an acoustic sound value corresponding to the digital sampling information of the T1 duration and a loudness value preset by the user.
  • the preset loudness value of the user is used by the laboratory to test the standard loudness data corresponding to different volume levels through the standard audio signal and pre-stored in the database of the digital television terminal, for example: the volume 23 sound corresponds to a standard loudness data, and the volume 24 sounds correspond to another standard data. Different volume levels correspond to different standard loudness data. Different users choose different loudness to choose their own loudness.
  • the volume gain coefficient may be a quotient of the sound loudness value and a preset loudness value of the user.
  • the calculated volume gain coefficient corresponding to the target channel is a volume gain coefficient corresponding to the audio data of the entire target channel.
  • the digital television terminal if the digital television terminal switches to play the Shenzhen Wei video channel, the digital television terminal replaces the volume gain coefficient corresponding to the Shenzhen Wei video channel calculated in step S205 with the existing volume gain coefficient corresponding to the Shenzhen Wei video channel in the database or The volume gain coefficient corresponding to the Shenzhen Wei video channel is saved in the database, and the volume gain coefficient of the channel calculated this time can be configured to adjust the volume of the program when the next time the switch to the Shenzhen Satellite TV information is received.
  • S207 Read the volume gain coefficient corresponding to the target channel in the database.
  • the step S208 is performed after the step of reading the volume gain coefficient corresponding to the target channel in the database is performed.
  • Adjust all original audio data of the target channel according to the volume gain coefficient is to adjust the amplitude of the entire original audio data according to the volume gain coefficient or separately adjust the amplitude of the original audio data of each of the frequency bands obtained by the dividing and aliasing
  • the adjusted audio data formed by the audio data of each frequency band, wherein the adjusted audio data amplitude may be a quotient of the original audio data amplitude and the volume gain coefficient.
  • all the original audio data of the target channel is adjusted according to the volume gain coefficient corresponding to the target channel in the database updated in step S206 or by reading a volume gain coefficient corresponding to the target channel in the database according to step S207.
  • the volume gain coefficient corresponding to Shenzhen Satellite TV is obtained according to step S206 or step S207, and all audio data of the Shenzhen Wei video channel is adjusted according to the volume gain coefficient.
  • step S202 and S209 reference may be made to the detailed description of step S101 and step S104 of the embodiment shown in FIG. 1, which is not described herein.
  • a flow chart of a third embodiment of a method for automatically controlling channel volume is provided. As shown in FIG. 3, a method for automatically controlling channel volume according to this embodiment includes the following steps:
  • S300 Perform periodic digital sampling of the T1 duration on the buffered original audio data of the target channel in a period of the T1 duration.
  • the digital sampling of the T1 duration can divide the audio frequency into multiple frequency bands according to the audio frequency range that the human ear can perceive and the sensitivity of the human ear to the audio frequency, and use different sampling rates according to different frequency bands to the T1 duration.
  • the audio data is digitally sampled.
  • the sampling method used for the digital sampling of the T1 duration in the present embodiment is a periodic digital sampling with a period of T1 duration.
  • the original audio data of the cached target channel is continuously updated according to user needs.
  • the original audio data is buffered until the user switches channels or shuts down.
  • the periodic digital samples of the T1 duration sample the buffered original audio data including the updated original audio data until the user switches channels or shuts down, and the sampling is stopped.
  • the sampled T1 duration raw audio data is not completely resampled.
  • the T1 duration can be referenced between the range of 20MS and 1S, and the duration of the T1 may be different for different applications.
  • the division of the audio frequency and the corresponding sampling frequency can be referred to the following table:
  • step S304 Determine whether the difference value is within a range of allowed difference values. If the determination result is no, step S304 is performed.
  • the original audio data of the T1 duration corresponding to the digital sample information of the T1 duration is output without pre-processing. That is, the original audio data of the T1 duration corresponding to the digital sample information of the T1 duration is output.
  • S304 Calculate, according to the acoustic sound value corresponding to the digital sample information of the T1 duration and the loudness value preset by the user, a volume gain coefficient corresponding to the digital sample information of the T1 duration.
  • the preset loudness value of the user is used by the laboratory to test standard loudness data corresponding to different volume levels through a standard audio signal and stored in a database of the digital television terminal in advance, for example, the volume 23 sound corresponds to a standard loudness data, and the volume 24 sounds correspond to another standard data. Different volume levels correspond to different standard loudness data. Different users choose different loudness to choose their own loudness.
  • the volume gain coefficient may be a quotient of the sound loudness value and a loudness value preset by the user.
  • the calculated volume gain coefficient corresponding to the digital sampling information of the T1 duration is a volume gain coefficient of the original audio data of the T1 duration corresponding to the digital sampling information of the target channel T1 duration.
  • S305 Adjust original audio data of the T1 duration corresponding to the data sampling information of the T1 duration of the target channel according to the volume gain coefficient.
  • the original audio data of the T1 duration corresponding to the data sampling information of the T1 duration of the adjustment target channel is obtained by dividing the amplitude of the whole original audio data of the T1 duration according to the volume gain coefficient or separately adjusting the original audio data of the T1 duration.
  • the adjusted T1 duration audio data formed by the amplitude of the audio data of each frequency band and the audio data of each frequency band is formed, wherein the adjusted audio data amplitude can be the quotient of the original audio data amplitude and the volume gain coefficient.
  • the original audio data of the T1 duration corresponding to the digital sampling information of the T1 duration of the target channel is adjusted according to a volume gain coefficient corresponding to the digital sampling information of the T1 duration calculated in step S304.
  • a volume gain coefficient corresponding to the digital sampling information of the T1 duration calculated in step S304.
  • the next volume gain coefficient corresponding to the digital sampling information of the next T1 duration adjusts the original audio data of the T1 duration corresponding to the digital sampling information of the next T1 duration of the Shenzhen TV channel, and thus adjusts the T1 duration as the adjustment period until the user Switch to other channels or shut down to stop the adjustment, this adjustment method can effectively solve the difference in the volume of different programs on the same channel, for example: the difference in volume between TV dramas and interstitial ads.
  • Step S301 and step S306 can be referred to step S101 and step S104 of the embodiment shown in FIG. 1.
  • Step S302 can be referred to step S202 of the embodiment shown in FIG. 2, and details are not described herein.
  • FIG. 4 is a schematic structural diagram of a first embodiment of a digital television terminal according to the present invention.
  • a digital television terminal according to this embodiment includes:
  • the sampling module 100 is configured to perform a T1 duration number on the original audio data of the cached target channel. Sampling.
  • the digital television terminal obtains the pre-decoded audio data of the target channel through a demultiplexer (DMUX), buffers the pre-decoded audio data in the digital television terminal, and pre-processes the audio data.
  • DMUX demultiplexer
  • the digital sampling of the T1 duration may be based on the audio frequency range perceived by the human ear and the sensitivity of the human ear to the audio frequency, and the audio frequency is divided into multiple frequency bands, and different sampling rates are used according to different frequency bands.
  • the duration of the audio data is digitally sampled.
  • the digital sampling for performing the T1 duration will use two sampling units in the embodiment, the first sampling unit is performing digital sampling of a T1 duration, and the second sampling unit is a periodic number with a period of T1 duration. Sampling, two units correspond to two embodiments, which will be described in the following second embodiment and third embodiment.
  • the T1 duration cocoa reference is between 20MS and 1S, and the T1 duration may be different for different applications.
  • the division of the audio frequency and the corresponding sampling frequency can be referred to the following table:
  • the loudness module 200 is configured to obtain an acoustic sound value according to the digital sampling information processing of the T1 duration.
  • the calculated loudness module 200 is the sound pressure data of each frequency band obtained by integrating the sampling data of the respective frequency bands sampled by the sampling module 100.
  • the obtained sound pressure data of each frequency band may be directly accumulated by the attenuation weighting process according to the difference of the frequency as the original loudness data of the audio data, and the attenuated data may be adjusted by the technician according to the actual situation.
  • Calculating a coefficient module 300 configured to calculate, according to the acoustic sound value and a preset loudness value of the user The volume gain factor is output.
  • the preset loudness value of the user is used by the laboratory to test the standard loudness data corresponding to different volume levels through the standard audio signal and pre-stored in the database of the digital television terminal, for example: the volume 23 sound corresponds to a standard loudness data, and the volume 24 sounds correspond to another standard data. Different volume levels correspond to different standard loudness data. Different users choose different loudness to choose their own loudness.
  • the volume gain coefficient is a quotient of the sound loudness value and a preset loudness value of the user.
  • the adjustment module 400 is configured to adjust the original audio data according to the volume gain coefficient.
  • the adjustment module 400 is an adjusted audio data formed by adjusting the amplitude of the whole original audio data according to the volume gain coefficient or separately adjusting the amplitude of the audio data of each frequency band obtained by dividing and dividing the audio data of each frequency band.
  • the adjusted audio data amplitude is a quotient of the original audio data amplitude and the volume gain coefficient.
  • the output module 500 is configured to output the adjusted audio data of the target channel.
  • the audio data of the target channel adjusted by the adjustment module 400 is output to the D/A module or the data of the adjusted target channel is transmitted to the peripheral through the digital channel, and then the peripheral is further D/A converted. , then output the actual program audio.
  • the digital audio signal is subjected to D/A conversion, it is further amplified by one or more stages, because the frequency characteristics of the amplification circuit of different audios are also different, so when calculating the sound level Taking the frequency characteristics into consideration, correcting the different weighted attenuation coefficients corresponding to different frequencies.
  • the specific method can sample and test the digital audio amplitude-frequency characteristic curve and the amplified digital audio amplitude-frequency characteristic curve before the input of the audio amplification circuit, and compare the differences. , the linear difference ratio of the sampling points is obtained to correct the weighted attenuation coefficient.
  • FIG. 5 is a schematic structural diagram of a second embodiment of a digital television terminal according to the present invention.
  • a digital television terminal according to this embodiment includes:
  • the sampling module 100 the calculation loudness module 200, the calculation coefficient module 300, the adjustment module 400, and the output module 500.
  • the digital television terminal may further include:
  • the first determining module 101 is configured to determine whether to read the volume gain coefficient corresponding to the target channel in the database, and if the determination result is no, notify the first sampling unit 10 of the original sound of the cached target channel.
  • the frequency data is subjected to digital sampling of the T1 duration. If the determination result is yes, the notification reading module 201 reads the volume gain coefficient corresponding to the target channel in the database.
  • the first determining module 101 can start executing when the target channel is switched, and the digital television terminal system can use a pop-up window or other manner to allow the user to select whether to read the volume gain coefficient corresponding to the target channel in the database, or further Optionally, the digital television terminal system automatically determines whether the volume gain coefficient corresponding to the target channel is stored in the database, and if not, notifying the first sampling unit 10 to perform a digital sampling of the T1 duration of the original audio data of the buffered target channel, if If yes, the notification reading module 201 reads the volume gain coefficient corresponding to the target channel in the database.
  • the reading module 201 is configured to read the volume gain coefficient corresponding to the target channel in the database. After the reading module 201 reads the volume gain coefficient corresponding to the target channel in the database, the first adjusting unit 50 is notified to adjust all the original audio data of the target channel according to the volume gain coefficient.
  • the difference calculation module 301 is configured to calculate a difference value between the sound loudness value and a loudness value preset by the user.
  • the difference value is an absolute value of the difference between the acoustic loudness value and the user-set loudness value.
  • the second determining module 401 is configured to determine whether the difference value is within the allowed difference value range. If the second determining unit 401 determines that the result is no, the first calculating unit 30 is notified to correspond to the digital sampling information of the T1 duration. The sound loudness value and the preset loudness value of the user calculate a volume gain coefficient corresponding to the target channel.
  • the second judging module 401 determines YES, the original audio data of the target channel does not need to be pre-processed.
  • the allowed difference value range is greater than or equal to Odb and less than or equal to 2db.
  • the update database module 501 is configured to update the volume gain coefficient corresponding to the target channel in the database.
  • the digital television terminal if the digital television terminal switches to play the Shenzhen Wei video channel, the digital television terminal replaces the volume gain coefficient corresponding to the Shenzhen Wei video channel calculated by the first calculating unit 30 with the existing volume corresponding to the Shenzhen Wei video channel in the database.
  • the sampling module 100 may further include:
  • the first sampling unit 10 is configured to perform digital sampling of the original audio data of the buffered target channel by a T1 duration.
  • the simple sound can be used to measure the current sound according to the sound intensity of the audio.
  • the size for example, is processed differently according to audio data of different frequencies to reduce the influence of the program volume on the human ear. Therefore, the digital sampling of the T1 duration can divide the audio frequency into multiple frequency bands according to the audio frequency range that the human ear can perceive and the sensitivity of the human ear to the audio frequency, and use different sampling rates according to different frequency bands to the T1 duration.
  • the audio data is digitally sampled.
  • the sampling method used in the present embodiment to perform digital sampling of the T1 duration is to perform digital sampling of a T1 duration.
  • the T1 duration can be referenced between 20MS and 1S, and is selected for different applications.
  • the duration of T1 may not be the same.
  • the division of the audio frequency and the corresponding sampling frequency can be referred to the following table:
  • the frequency division unit 20 is configured to divide the audio frequency into multiple frequency bands according to the audio frequency range that the human ear can perceive and the sensitivity of the human ear to the audio frequency, and use the different sampling rates according to different frequency bands to the original audio data. Digital sampling of the T1 duration is performed.
  • the calculation coefficient module 300 may further include:
  • the first calculating unit 30 is configured to calculate a volume gain coefficient corresponding to the target channel according to an acoustic sound value corresponding to the digital sampling information of the T1 duration and a loudness value preset by the user.
  • the first calculating unit 30 calculates the volume gain coefficient corresponding to the target channel according to the acoustic sound value corresponding to the digital sampling information of the T1 duration calculated by the loudness module 200 and the loudness value preset by the user.
  • the preset loudness value of the user is used by the laboratory to test standard loudness data corresponding to different volume levels through a standard audio signal and stored in a database of the digital television terminal in advance, for example: volume 23 sound corresponds to a standard loudness data, volume 24 sounds correspond to another standard data, others are not Different volume levels correspond to different standard loudness data, and different users choose to adapt to their loudness by selecting different volume.
  • the volume gain coefficient may be a quotient of the sound loudness value and a preset loudness value of the user.
  • the calculated volume gain coefficient corresponding to the target channel is a volume gain coefficient corresponding to the audio data of the entire target channel.
  • the adjusting unit 400 may further include:
  • the amplitude adjustment unit 40 is configured to adjust an amplitude of the whole original audio data according to the volume gain coefficient or separately adjust an amplitude of the original audio data of each of the frequency bands obtained by the division, and alias the adjustment of each of the frequency bands Audio data.
  • the adjusted audio data amplitude can be a quotient of the original audio data amplitude and the volume gain coefficient.
  • the first adjusting unit 50 is configured to adjust all the original audio data of the target channel according to the volume gain coefficient.
  • the first adjustment unit 50 adjusts all of the original audio data of the target channel in accordance with the amplitude adjustment unit 40.
  • all the original audio data of the target channel is adjusted according to the reading module 201 reading a volume gain coefficient corresponding to the target channel in the database or updating the volume gain coefficient corresponding to the target channel in the database updated by the database module 501.
  • the volume gain coefficient corresponding to Shenzhen Satellite TV is obtained according to the update database module 501 or the reading module 201, and all the Shenzhen Wei video channels are adjusted according to the volume gain coefficient. Audio data.
  • FIG. 6 is a schematic structural diagram of a third embodiment of a digital television terminal according to the present invention.
  • a digital television terminal according to this embodiment includes:
  • the sampling module 100 may further include:
  • the second sampling unit 60 is configured to perform periodic digital sampling of the T1 duration on the original audio data of the buffered target channel in a period of the T1 duration.
  • the digital sampling of the T1 duration can divide the audio frequency into multiple frequency bands according to the audio frequency range that the human ear can perceive and the sensitivity of the human ear to the audio frequency, and use different sampling rates according to different frequency bands to the T1 duration.
  • the audio data is digitally sampled.
  • the sampling method used for the digital sampling of the T1 duration in the present embodiment is a periodic digital sampling with a period of T1 duration.
  • the original audio data of the cached target channel is updated according to the user's needs to continuously update the buffered original audio data until the user switches channels or shuts down, and the periodic digital sample of the T1 duration buffers the original audio data of the cache including the updated original audio data. Sampling is performed until the user switches channels or shuts down to stop sampling, wherein the periodic sampling of the T1 duration does not completely resample the sampled T1 duration raw audio data.
  • the T1 duration can be referenced between the range of 20MS and 1S, and the duration of the T1 may be different for different applications.
  • the division of the audio frequency and the corresponding sampling frequency can be referred to the following table:
  • the calculation coefficient module 300 may further include:
  • the second calculating unit 70 is configured to calculate a volume gain coefficient corresponding to the digital sampling information of the T1 duration according to the acoustic sound value corresponding to the digital sampling information of the T1 duration and the loudness value preset by the user.
  • the preset loudness value of the user is used by the laboratory to test standard loudness data corresponding to different volume levels through a standard audio signal and stored in a database of the digital television terminal in advance, for example, the volume 23 sound corresponds to a standard loudness data, and the volume 24 sounds correspond to another standard data, and other different volume levels correspond to different standard loudness data. Different users select different volume levels. Choose to adapt to your own loudness.
  • the volume gain coefficient may be a quotient of the sound loudness value and a preset loudness value of the user.
  • the calculated volume gain coefficient corresponding to the digital sampling information of the T1 duration is a volume gain coefficient of the original audio data of the T1 duration corresponding to the digital sampling information of the target channel T1 duration.
  • the adjustment module 400 can further include:
  • the second adjusting unit 80 is configured to adjust the T1 duration raw audio data corresponding to the data sampling information of the T1 duration of the target channel according to the volume gain coefficient.
  • the second adjusting unit 80 adjusts the original audio data of the T1 duration corresponding to the data sampling information of the T1 duration of the target channel according to the amplitude adjusting unit 40.
  • the second adjusting unit 80 adjusts the T1 duration raw audio data corresponding to the T1 duration data sampling information of the target channel according to a volume gain coefficient corresponding to the T1 duration data sampling information calculated by the second calculating unit 70. For example, in a practical application, if the digital television terminal switches to play the Shenzhen Wei video channel, the second calculating unit 70 calculates the volume gain coefficient corresponding to the original audio data of the Shenzhen Satellite TV T1 duration, and adjusts the Shenzhen Wei video channel according to the volume gain coefficient.
  • the digital sampling information of the T1 duration corresponds to the original audio data of the T1 duration, and then the digital television terminal obtains another volume gain coefficient corresponding to the digital sampling information of another T1 duration of the Shenzhen Satellite TV according to the second calculating unit 70, according to the other Another volume gain coefficient corresponding to the digital sampling information of the T1 duration adjusts the original sampling data of the T1 duration of the digital sampling information of another T1 duration of the Shenzhen Wei video channel, so that the T1 duration is adjusted for the adjustment period until the user switches to Other channels or shutdown to stop adjusting this adjustment method can effectively solve the problem of different program volume differences of the same channel, for example: the difference in volume between TV dramas and interstitial advertisements.
  • the present invention has the following advantages:
  • the audio data buffered in the digital television terminal is digitally sampled according to the characteristics of the human ear's sensitivity to sound at different frequencies, and the volume gain coefficient is calculated, and the original audio data of the target channel is adjusted according to the volume gain coefficient.
  • the output of the actual audio data loudness is consistent with the user's preset loudness, which effectively solves the problem that the program volume suddenly becomes small when switching channels or switching programs, and the embodiment of the present invention is the existing existing digital television terminal equipment hardware.
  • the volume of the program is pre-processed to automatically adjust the volume of different programs to the standard volume, effectively reducing the production cost of the digital television terminal having the function of the embodiment of the present invention, and the embodiment of the present invention automatically adjusts the volume of the program to It has the least impact on the human ear and improves the user experience.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

Abstract

La présente invention concerne un procédé de commande automatique du volume de canal, faisant appel : à l'application d'un échantillonnage numérique à des données audio d'origine mises en tampon d'un canal cible pendant une durée T1; au traitement d'une valeur de sonie sonore obtenue conformément aux informations d'échantillonnage numérique obtenues après l'échantillonnage de durée T1; au calcul d'un coefficient de gain de volume conformément à la valeur de sonie sonore et à une valeur de sonie prédéfinie par l'utilisateur; au réglage des données audio d'origine du canal cible conformément au coefficient de gain de volume; et à la sortie des données audio réglées du canal cible. La présente invention concerne également un terminal de télévision numérique. La présente invention résout le problème de l'augmentation ou de la diminution soudaine du volume de programme lorsque le canal de programme est commuté au cours de la lecture du programme, ce qui améliore l'expérience d'utilisateur et réduit le coût de production.
PCT/CN2012/086009 2012-10-30 2012-12-06 Procédé de commande automatique de volume de canal et terminal de télévision numérique WO2014067206A1 (fr)

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