US20120306677A1 - System and method to modify a metadata parameter - Google Patents
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- US20120306677A1 US20120306677A1 US13/584,619 US201213584619A US2012306677A1 US 20120306677 A1 US20120306677 A1 US 20120306677A1 US 201213584619 A US201213584619 A US 201213584619A US 2012306677 A1 US2012306677 A1 US 2012306677A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
- H03G7/007—Volume compression or expansion in amplifiers of digital or coded signals
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
- G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
- G11B27/034—Electronic editing of digitised analogue information signals, e.g. audio or video signals on discs
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3089—Control of digital or coded signals
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- 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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/233—Processing of audio elementary streams
- H04N21/2335—Processing of audio elementary streams involving reformatting operations of audio signals, e.g. by converting from one coding standard to another
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- 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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/81—Monomedia components thereof
- H04N21/8106—Monomedia components thereof involving special audio data, e.g. different tracks for different languages
Abstract
A method includes receiving digital audio data at an audio adjustment system. The method includes converting a portion of the digital audio data to an analog audio signal with a digital-to-analog converter of the audio adjustment system to form a sample analog audio signal. The method includes determining a dynamic range of the sample analog audio signal with the audio adjustment system. The method also includes modifying a metadata parameter of the digital audio data with the audio adjustment system when the dynamic range of the sample analog audio signal is below a threshold. The metadata parameter is a dialog normalization parameter.
Description
- This application is a Continuation patent application of, and claims priority from, U.S. patent application Ser. No. 12/262,742, filed on Oct. 31, 2008, and entitled “SYSTEM AND METHOD TO MODIFY A METADATA PARAMETER,” which is hereby incorporated by reference in its entirety.
- The present disclosure is generally related to modifying a metadata parameter.
- Digital audio data may include a dialog normalization (dialnorm) metadata parameter to set a standard volume level for dialog encoded by the digital audio data. The purpose of the dialnorm parameter is to prevent major changes in perceived volume level when media content changes, such as when one television program ends and another television program begins. The dialnorm parameter may be used by devices, such as set-top box devices, that decode digital audio data to maintain dialog of different content at the same perceived volume level. For example, a set-top box device may modify the dialnorm metadata parameter to maintain a −20 decibels Full Scale (dbFS) dialog level. To illustrate, when the set-top box device receives a movie having a dialnorm of −25 dbFS, the set-top box device may increase the dialnorm by 5 db and output the movie at a −20 dbFS dialog level. When the set-top box device receives a television program having a dialnorm of −18 dbFS, the set-top box device may decrease the dialnorm by 2 db to a −20 dbFS dialog level. In this way, the movie and the television program are output with the same dialnorm in an attempt to minimize any perceived difference in volume when media content received by the set-top box device transitions from the movie to the television program.
- However, advertisers may reduce the dynamic range of advertisements while keeping the dialnorm at the same value as media content, resulting in the advertisements having a greater perceived loudness than the media content. Some viewers may find the perceived fluctuation in loudness from the media content to the advertisement annoying.
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FIG. 1 is a block diagram of a first particular embodiment of a system to modify a metadata parameter; -
FIG. 2 is a block diagram of a second particular embodiment of a system to modify a metadata parameter; -
FIG. 3 is a block diagram of a third particular embodiment of a system to modify a metadata parameter; -
FIG. 4 is a flow diagram of a first particular embodiment of a method to modify a metadata parameter; -
FIG. 5 is a flow diagram of a second particular embodiment of a method to modify a metadata parameter; -
FIG. 6 is a flow diagram of a third particular embodiment of a method to modify a metadata parameter; and -
FIG. 7 is a block diagram of an illustrative embodiment of a general computer system. - In a particular embodiment, a method includes receiving digital audio data at an audio adjustment system. The method includes converting a portion of the digital audio data to an analog audio signal with a digital-to-analog converter of the audio adjustment system to form a sample analog audio signal. The method includes determining a dynamic range of the sample analog audio signal with the audio adjustment system. The method also includes modifying a metadata parameter of the digital audio data with the audio adjustment system when the dynamic range of the sample analog audio signal is below a threshold. The metadata parameter is a dialog normalization parameter.
- In a particular embodiment, a system includes a processor and a memory accessible to the processor. The memory includes an audio buffer operable to receive digital audio data. The memory includes an audio sampler operable to sample the digital audio data to obtain digital audio data samples at intervals. The memory includes a digital-to-analog (D/A) converter operable to convert the digital audio data samples to analog audio signals. The memory includes a dynamic range analyzer operable to determine a dynamic range of each of the analog audio signals. The memory also includes a metadata parameter modifier responsive to the dynamic range analyzer to modify a metadata parameter of the digital audio data when the dynamic range of a particular analog audio signal is below a threshold.
- In a particular embodiment, a computer-readable storage medium includes operational instructions that, when executed by a processor, cause the processor to receive digital audio data having a metadata parameter. The computer-readable storage medium includes operational instructions that, when executed by the processor, cause the processor to convert portions of the digital audio data to analog audio signal samples. The analog audio signal samples include a first sample from a first portion of the digital audio data that precedes a second portion of the digital audio data used to form a second sample. The computer-readable storage medium includes operational instructions that, when executed by the processor, cause the processor to determine a first dynamic range of the first sample and a second dynamic range of the second sample. The computer-readable storage medium includes operational instructions that, when executed by the processor, cause the processor to determine a difference between the first dynamic range of the first sample and the second dynamic range of the second sample. The computer-readable storage medium also includes operational instructions that, when executed by the processor, cause the processor to modify the metadata parameter of the digital audio data when the difference exceeds a threshold.
- In a particular embodiment, a system includes an audio buffer operable to receive digital audio data. The system includes an audio sampler that is operable to sample the digital audio data to obtain first sampled digital audio data and to sample the digital audio data to obtain second sampled digital audio data. The system also includes a digital-to-analog (D/A) converter operable to convert the first sampled digital audio data to a first analog audio signal and to convert the second sampled digital audio data to a second analog audio signal. The system also includes a dynamic range analyzer operable to measure a first dynamic range of the first analog audio, to measure a second dynamic range of the second analog audio, and to measure a difference between the first dynamic range and the second dynamic range. The system also includes a metadata parameter modifier responsive to the dynamic range analyzer to modify a metadata parameter of the digital audio data.
- In another particular embodiment, a method includes receiving first and second encoded digital audio data including a metadata parameter having a first value. The first encoded digital audio data has a first dynamic range and the second encoded digital audio data has a second dynamic range. The method also includes outputting first decoded digital audio data corresponding to the first encoded digital audio data and outputting second decoded digital audio data corresponding to the second encoded digital audio data. The first decoded digital audio data includes the metadata parameter having the first value. The second decoded digital audio data includes a modified metadata parameter having a second value.
- In a particular embodiment, a computer-readable storage medium includes operational instructions, that when executed by a processor, cause the processor to receive digital audio data. The computer-readable storage medium also includes operational instructions, that when executed by the processor, further cause the processor to convert the digital audio data to an analog audio signal. The computer-readable storage medium further includes operational instructions, that when executed by the processor, cause the processor to measure a dynamic range of the analog audio signal. The processor modifies a metadata parameter of the digital audio data when the dynamic range is below a threshold.
- Referring to
FIG. 1 , a block diagram of a first particular embodiment of a system to modify a metadata parameter is depicted and generally designated 100. Thesystem 100 includes anaudio adjustment system 102. - The
audio adjustment system 102 includes aninput 130 and anoutput 132. Theaudio adjustment system 102 is operable to receive, at theinput 130, first encodeddigital audio data 104 including ametadata parameter 106 having afirst value 108. The first encodeddigital audio data 104 has a firstdynamic range 110. Theaudio adjustment system 102 is further operable to receive, at theinput 130, second encodeddigital audio data 112 including themetadata parameter 106 having thefirst value 108. The second encodeddigital audio data 112 has a seconddynamic range 114. - The
audio adjustment system 102 is operable to output, at theoutput 132, first decodeddigital audio data 116 including themetadata parameter 106 having the first value of 108. The first decodeddigital audio data 116 corresponds to the first encodeddigital audio data 104. Theaudio adjustment system 102 is further operable to output, at theoutput 132, second decodeddigital audio data 118. The second decodeddigital audio data 118 includes a modifiedmetadata parameter 120 having asecond value 122. The second decodeddigital audio data 118 corresponds to the second encodeddigital audio data 112. - In operation, the
audio adjustment system 102 receives the first encodeddigital audio data 104 and the second encodeddigital audio data 112. Theaudio adjustment system 102 determines that themetadata parameter 106 of the first and second encodeddigital audio data first value 108. Theaudio adjustment system 102 determines that the first encodeddigital audio data 104 includes the firstdynamic range 110 and the second encodeddigital audio data 112 includes the seconddynamic range 114. When theaudio adjustment system 102 determines that the seconddynamic range 114 differs from the firstdynamic range 110 by more than a threshold, theaudio adjustment system 102 outputs the modifiedmetadata parameter 120 including thesecond value 122. In a particular embodiment, when the seconddynamic range 114 is less than the firstdynamic range 110, theaudio adjustment system 102 outputs the modifiedmetadata parameter 120 including thesecond value 122 that is less than thefirst value 108 of themetadata parameter 106. In a particular embodiment, when the seconddynamic range 114 is greater than the firstdynamic range 110, theaudio adjustment system 102 outputs the modifiedmetadata parameter 120 including thesecond value 122 that is greater than thefirst value 108. - When the first and second encoded
digital audio data metadata parameter 106 including thefirst value 108, and the seconddynamic range 114 is different than the firstdynamic range 110, the second encodeddigital audio data 112 may have a different perceived loudness than the first encodeddigital audio data 104. By outputting the modifiedmetadata parameter 120 including thesecond value 122 when the seconddynamic range 114 differs from the firstdynamic range 110, theaudio adjustment system 102 enables a perceived loudness of the second decodeddigital audio data 118 to be substantially the same as a perceived loudness of the first decodeddigital audio data 116. In a particular embodiment, theaudio adjustment system 102 may modify the modifiedmetadata parameter 120 based on a difference between the firstdynamic range 110 and the seconddynamic range 114. For example, the difference between thefirst value 108 and thesecond value 120 may be determined based on the difference between the firstdynamic range 110 and the seconddynamic range 114. Thus, by modifying themetadata parameter 106 to create the modifiedmetadata parameter 120, the perceived loudness of the first and second decodeddigital audio data digital audio data 104 is media content, such as a television program or a movie, and the second encodeddigital audio data 112 is an advertisement. - In a particular embodiment, the
audio adjustment system 102 is incorporated into a set-top box device, as will be described with respect toFIG. 2 . In another particular embodiment, theaudio adjustment system 102 is a standalone digital audio decoder, as will be described with respect toFIG. 3 . - Referring to
FIG. 2 , a block diagram of a second particular embodiment of a system to modify a metadata parameter is depicted and generally designated 200. Thesystem 200 includes a set-top box device 202 operable to receive encodedmedia content 240 from amedia content server 204 via anetwork 206. - The set-
top box device 202 is operable to receive encodedmedia content 240 and to outputdigital video data 272 anddigital audio data 248. The set-top box device 202 includes an audio andvideo separator 210, anaudio adjustment system 212, avideo decoder 214, and avideo buffer 216. The audio andvideo separator 210 is operable to receive the encodedmedia content 240, to output encodeddigital video data 242, and to output encoded digital audio data 244. Thevideo decoder 214 is operable to receive the encodeddigital video data 242, to decode the encodeddigital video data 242, and to placedigital video data 276 at avideo buffer 216. - The
audio adjustment system 212 includes aprocessor 218, anaudio decoder 220, and amemory 222. Theaudio adjustment system 212 is operable to receive the encoded digital audio data 244 that includes ametadata parameter 246 and to output thedigital audio data 248 including a modifiedmetadata parameter 270. In a particular embodiment, theaudio adjustment system 212 is theaudio adjustment system 102 shown inFIG. 1 . - The
audio decoder 220 is operable to receive the encoded digital audio data 244 and to decode the encoded digital audio data 244 to create thedigital audio data 248 at theaudio buffer 224. Thememory 222 includes anaudio buffer 224, anaudio sampler 226, a digital-to-analog (D/A)converter 228, adynamic range analyzer 230, and ametadata parameter modifier 232. Theaudio sampler 226 is operable to obtain a sample ofdigital audio data 252 of thedigital audio data 248 at theaudio buffer 224. The digital-to-analog (D/A)converter 228 is operable to receive the sample ofdigital audio data 252 and convert it to ananalog audio signal 254 having asignal level 256 and anoise level 258. Thedynamic range analyzer 230 is operable to determine adynamic range 260 of theanalog audio signal 254 and to compare thedynamic range 260 to athreshold 262. For example, thethreshold 262 may be a predetermined decibel level that has a perceived loudness level that is greater than a decibel level of movies and television programs. To illustrate, when movies and television programs received at the set-top box device 202 have a dynamic range of sixty decibels, thethreshold 262 may be set at fifty-seven decibels. Thethreshold 262 may have a default value, a user-selectable value, a value received from themedia content server 204, or any combination thereof. - In a particular embodiment, the
dynamic range analyzer 230 determines thedynamic range 260 by measuring thesignal level 256 and thenoise level 258 of theanalog audio signal 254 and measuring thedynamic range 260 based on thesignal level 256 and thenoise level 258. Thedynamic range analyzer 230 is further operable to instruct themetadata parameter modifier 232 to modify themetadata parameter 250 of thedigital audio data 248 when thedynamic range 260 differs from thethreshold 262 by more than a pre-determined amount. In a particular embodiment, the metadata parameter is a dialog normalization (dialnorm) parameter used to prevent major changes in perceived volume level when media content changes, such as when one television program ends and another television program begins. For example, when themetadata parameter 250 is a dialog normalization parameter, themetadata parameter modifier 232 may reduce themetadata parameter 250 by three decibels. In another particular embodiment, themetadata parameter 250 is modified concurrently with thevideo decoder 214 performing a decode operation of the encodeddigital video data 242 at thevideo decoder 214. - The set-
top box device 202 is operable to output thedigital video data 272 and thedigital audio data 248. In a particular embodiment, thedigital video data 272 is synchronized for playback with thedigital audio data 248. In another particular embodiment, thedigital video data 272 is motion picture experts group (MPEG) compliant video. - In operation, the set-
top box device 202 receives the encodedmedia content 240 from themedia content server 204 via thenetwork 206. In a particular embodiment, the encoded digital audio data 244 includes Dolby® digital compliant encoded digital audio data. The audio andvideo separator 210 receives the encodedmedia content 240 and outputs the encoded digital audio data 244 and the encodeddigital video data 242. Theaudio adjustment system 212 receives the encoded digital audio data 244 including themetadata parameter 246. Theaudio sampler 226 samples thedigital audio data 248 to create the sample ofdigital audio data 252. The digital-to-analog (D/A)converter 228 converts the sample ofdigital audio data 252 to theanalog audio signal 254. Thedynamic range analyzer 230 determines thedynamic range 260 of the sample of theanalog audio signal 254. Thedynamic range analyzer 230 instructs themetadata parameter modifier 232 to modify themetadata parameter 250 when thedynamic range 260 is below thethreshold 262. In a particular embodiment, themetadata parameter 250 is a dialog normalization (dialnorm) parameter. - By modifying the
metadata parameter 250 to create the modifiedmetadata parameter 270, theaudio adjustment system 212 modifies a perceived playback loudness of thedigital audio data 248 when thedynamic range 260 is below thethreshold 262. For example, when television programs have a dynamic range of sixty decibels and advertisements have a dynamic range of less than fifty decibels, the ten decibel difference in dynamic range may result in certain listeners perceiving the advertisements as louder than the television programs. By reducing themetadata parameter 250 of the advertisements by three decibels, the advertisements and the television programs may be output at approximately the same perceived loudness. Reducing fluctuations of the loudness of thedigital audio data 248 may result in an improved listening experience. -
FIG. 3 is a block diagram of a third particular embodiment of a system to modify a metadata parameter and is generally designated 300. Thesystem 300 includes anaudio adjustment system 302. In a particular embodiment, theaudio adjustment system 302 is theaudio adjustment system 102 ofFIG. 1 . - The
audio adjustment system 302 is operable to receive encoded digital audio data (DAD) 320 including ametadata parameter 322 and tooutput DAD 324 including a modifiedmetadata parameter 354. Theaudio adjustment system 302 includes aprocessor 304, anaudio decoder 306 and amemory 308. Thememory 308 includes anaudio sampler 312, anaudio buffer 310, a digital-to-analog (D/A)converter 314, adynamic range analyzer 316, and ametadata parameter modifier 318. - The
audio decoder 306 is operable to decode the encodedDAD 320 to generate theDAD 324 having themetadata parameter 322. Theaudio buffer 310 is operable to receive theDAD 324 from theaudio decoder 306. TheDAD 324 is also referred to as decoded digital audio data. Theaudio sampler 312 is operable to sample theDAD 324 to obtain a first sampledDAD 328 and a second sampledDAD 329. The digital-to-analog (D/A)converter 314 is operable to convert a sampled DAD to an analog audio signal. For example, the digital-to-analog (D/A)converter 314 may convert the first sampledDAD 328 to a firstanalog audio signal 336 and to convert the second sampledDAD 329 to a secondanalog audio signal 338. - The
dynamic range analyzer 316 is operable to measure a firstdynamic range 340 of the firstanalog audio signal 336 and to measure a seconddynamic range 342 of the secondanalog audio signal 338. Thedynamic range analyzer 316 is further operable to measure afirst difference 344 between the firstdynamic range 340 and the seconddynamic range 342. For example, when the firstdynamic range 340 is sixty decibels and the seconddynamic range 342 is fifty decibels, thefirst difference 344 is ten decibels. Themetadata parameter modifier 318 is responsive to thedynamic range analyzer 316 to modify themetadata parameter 322 of theDAD 324 when thefirst difference 344 is greater than athreshold 345. For example, when the firstdynamic range 340 is sixty decibels and the seconddynamic range 342 is fifty decibels, thedynamic range analyzer 316 may reduce themetadata parameter 322 by three decibels when thethreshold 345 is nine decibels. - The
audio sampler 312 may be configured to sample thedigital audio data 324 at predetermined intervals. For example, theaudio sample 312 may be operable to generate sampled digital audio data, such as the first sampledDAD 328, second sampledDAD 329, third sampledDAD 330, and fourth sampledDAD 331, at intervals of less than six hundred milliseconds. For example, theaudio sampler 312 may sample the second sampledDAD 329 approximately five hundred milliseconds after sampling thefirst DAD 329. In a particular embodiment, the first sampledDAD 328 includes a media content program, such as a television program or a movie, and the second sampledDAD 329 includes anadvertisement 334. Thedynamic range analyzer 316 is further operable to measure asecond difference 350 by measuring a thirddynamic range 346 of a third sampledDAD 330 and measuring a fourthdynamic range 348 of a fourth sampledDAD 331. Themetadata parameter modifier 318 is further operable to modify themetadata parameter 322 when thesecond difference 350 is less than thethreshold 345. In a particular embodiment, thedynamic range analyzer 316 is operable to compare thesecond difference 350 to thethreshold 345 and to instruct themetadata parameter modifier 318 to modify themetadata parameter 322. - In operation, the
audio decoder 306 receives and decodes the encodedDAD 320 including themetadata parameter 322. In a particular embodiment, themetadata parameter 322 is a dialog normalization (dialnorm) parameter that is used to prevent major changes in perceived volume level when media content changes, such as when one television program ends and another television program begins. The decodedDAD 324 is stored at theaudio buffer 310. Theaudio sampler 312 obtains the first sampledDAD 328 and the second sampledDAD 329 of theDAD 324 from theaudio buffer 310. The D/A converter 314 converts the first sampledDAD 328 to a firstanalog audio signal 336 and converts the second sampledDAD 329 to a secondanalog audio signal 338. Thedynamic range analyzer 316 determines a firstdynamic range 340 of the firstanalog audio signal 336 and a seconddynamic range 342 of the secondanalog audio signal 338. For example, the firstdynamic range 340 may be determined by determining a signal-to-noise (S/N) ratio of the firstanalog audio signal 336. Thedynamic range analyzer 316 determines afirst difference 344 between the firstdynamic range 340 and the seconddynamic range 342. When thefirst difference 344 differs from athreshold 345 by more than a pre-determined amount, thedynamic range analyzer 316 instructs themetadata parameter modifier 318 to modify themetadata parameter 322 to create the modifiedmetadata parameter 354 of theDAD 324. For example, when the firstdynamic range 340 is sixty decibels and the seconddynamic range 342 is fifty decibels, thefirst difference 344 is ten decibels. When thefirst difference 344 exceeds thethreshold 345, thedynamic range analyzer 316 instructs themetadata parameter modifier 318 to reduce themetadata parameter 322, such as a dialog normalization parameter, by three decibels. In a particular embodiment, thethreshold 345 is determined based on a default threshold. For example, thethreshold 345 may have a default value, such as three decibels, or a user-selectable value. - In a particular embodiment, the
metadata parameter modifier 318 is further operable to reduce themetadata parameter 322, such as a dialog normalization parameter, of theDAD 324 by approximately one-third of the dynamic range difference when thefirst difference 344 is greater than thethreshold 345. For example, when thefirst difference 344 is ten decibels, themetadata parameter modifier 318 may reduce themetadata parameter 322 by three decibels. In another example, when thefirst difference 344 is six decibels, themetadata parameter modifier 318 may reduce themetadata parameter 322 by two decibels. In a particular embodiment, themetadata parameter modifier 318 is further operable to reduce themetadata parameter 322 of theDAD 324 by three decibels when thedifference 344 is greater than thethreshold 345. - By determining when the first
dynamic range 340 differs from the seconddynamic range 342 by more than thethreshold 345, theaudio adjustment system 302 is able to modify themetadata parameter 322 to minimize any perceived difference in loudness levels of themedia content program 335 and theadvertisement 334. By reducing perceived differences in loudness levels, listeners can enjoy a listening volume that does not fluctuate significantly when the encodedDAD 320 changes from themedia content program 332 to theadvertisement 333 and back again. For example, when theadvertisement 333 has the firstdynamic range 340 that is less than the seconddynamic range 342 of the of themedia content program 335 but both have the same dialnorm value as themetadata parameter 322, theadvertisement 334 is perceived by a listener as louder than themedia content program 335. By outputting theDAD 324 having the modifiedmetadata parameter 354, the difference in perceived loudness between theadvertisement 334 and themedia content program 335 may be minimized. - Although various embodiments in
FIG. 2 andFIG. 3 are illustrated having components that include computer readable instructions stored in memory that are executable by a processor, such as theaudio buffer 224, theaudio sampler 226, the D/A converter 228, thedynamic range analyzer 230, and themetadata parameter modifier 232 ofFIG. 2 and theaudio buffer 310, theaudio sampler 312, the D/A converter 314, thedynamic range analyzer 316, and themetadata parameter modifier 318 ofFIG. 3 , in other embodiments one or more of the components ofFIG. 2 andFIG. 3 may be implemented in the form of firmware, hardware, software executed by a processor, or any combination thereof. -
FIG. 4 is a flow diagram of a first particular embodiment of a method of modifying a metadata parameter. The method may be performed by theaudio adjustment system 102 ofFIG. 1 , theaudio adjustment system 212 ofFIG. 2 , or theaudio adjustment system 302 ofFIG. 3 . - Digital audio data is received, at 402. For example, in
FIG. 2 , encoded digital audio data 244 is received by theaudio adjustment system 212. Continuing to 404, the digital audio data is converted to an analog audio signal. For example, inFIG. 2 , theaudio sampler 226 converts thedigital audio data 248 to create the sample ofdigital audio data 252. Proceeding to 406, a dynamic range of the analog audio signal is measured. For example, inFIG. 2 , thedynamic range analyzer 230 measures thedynamic range 260 of theanalog audio signal 254. Moving to 408, a signal level of the analog audio signal may be measured. For example, inFIG. 2 , the D/A converter 228 measures thesignal level 256 of theanalog audio signal 254. Moving to 410, a noise level of the analog audio signal may be measured. For example, inFIG. 2 , the D/A converter 228 measures thenoise level 258 of theanalog audio signal 254. Moving to 412, the dynamic range may be measured based on the signal level and the noise level. For example, inFIG. 2 , thedynamic range analyzer 230 measures thedynamic range 260 based on thesignal level 256 and thenoise level 258 of theanalog audio signal 254. Proceeding to 414, a metadata parameter of the digital audio is modified when the dynamic range is below a threshold. For example, inFIG. 2 , themetadata parameter 250 is modified to create the modifiedmetadata parameter 270 when thedynamic range 260 is below thethreshold 262. The method ends at 416. By modifying the metadata parameter when the dynamic range is below a threshold, fluctuations between a perceived loudness of different media content may be reduced. -
FIG. 5 is a flow diagram of a second particular embodiment of a method to modify a metadata parameter. The method may be performed by an audio adjustment system, such as theaudio adjustment system 102 ofFIG. 1 , theaudio adjustment system 212 ofFIG. 2 , or theaudio adjustment system 302 ofFIG. 3 . - Digital audio data is received at 502. For example, in
FIG. 3 , digital audio data (DAD) 324 is received at theaudio buffer 310. Continuing to 504, the digital audio data is sampled to obtain a first sample of digital audio data. For example, inFIG. 3 , theDAD 324 is sampled by theaudio sampler 312 to obtain the first sampledDAD 328. Moving to 506, the digital audio data is sampled to obtain a second sample of digital audio data. For example, inFIG. 3 , theDAD 324 is sampled by theaudio sampler 312 to obtain the second sampledDAD 329. - Proceeding to 508, the first sampled digital audio data is converted to a first analog audio signal. For example, in
FIG. 3 , the D/A converter 314 converts the first sampledDAD 328 to the firstanalog audio signal 336. Advancing to 510, the second sampled digital audio data is converted to a second analog audio signal. For example, inFIG. 3 , the D/A converter 314 converts the second sampledDAD 329 to the secondanalog audio signal 338. Moving to 512, a first dynamic range of the analog audio signal is measured. For example, inFIG. 3 , thedynamic range analyzer 316 measures the firstdynamic range 340 of the firstanalog audio signal 336. Advancing to 514, a second dynamic range of the second analog audio signal is measured. For example, inFIG. 3 , thedynamic range analyzer 316 measures the seconddynamic range 342 of the secondanalog audio signal 338. - Proceeding to 516, a difference between the first dynamic range and the second dynamic range is measured. For example, in
FIG. 3 , thedynamic range analyzer 316 measures thefirst difference 344 between the firstdynamic range 340 and the seconddynamic range 342. Advancing to 518, a metadata parameter of the digital audio data is modified when the difference is greater than a threshold. For example, inFIG. 3 , thedynamic range analyzer 316 instructs themetadata parameter modifier 318 to modify themetadata parameter 322 when thefirst difference 344 is greater than thethreshold 345. The method ends at 520. Thus, when an advertisement and a television program have a same metadata parameter, such as a dialog normalization parameter, and the advertisement has a first dynamic range that is less than a second dynamic range of the television program, a listener listening to playback of the advertisement and television program may perceive the advertisement as louder than the television program. By reducing the dialog normalization parameter when the difference between the first dynamic range and the second dynamic range is more than a perceivable threshold, fluctuations between a perceived loudness of the television program and the advertisement may be reduced. -
FIG. 6 is a flow diagram of a third particular embodiment of a method to modify a metadata parameter. The method may be performed by an audio adjustment system, such as theaudio adjustment system 102 depicted inFIG. 1 , theaudio adjustment system 212 depicted inFIG. 2 , or theaudio adjustment system 302 depicted inFIG. 3 . - First encoded digital audio data including a metadata parameter having a first value is received, at 602. The first encoded digital audio data has a first dynamic range. For example, in
FIG. 1 , the first encodeddigital audio data 104 includes themetadata parameter 106 with thefirst value 108 and the firstdynamic range 110. Moving to 604, the second encoded digital audio data including the metadata parameter with the first value is received. The second encoded digital audio data has a second dynamic range. For example, inFIG. 1 , the second encodeddigital audio data 112 includes themetadata parameter 106 with thefirst value 108 and the seconddynamic range 114. - Continuing to 606, the method includes outputting first decoded audio data including the metadata parameter having the first value. The first decoded digital audio data corresponds to the first encoded digital audio data. For example, in
FIG. 1 , the first decodeddigital audio data 116, corresponding to the first encodeddigital audio data 104, is output by theaudio adjustment system 102 at theoutput 132. The first decodeddigital audio data 116 includes themetadata parameter 106 having thefirst value 108. Advancing to 608, the second decoded digital audio data including the metadata parameter having a second value is output. The second decoded digital audio data corresponds to the second encoded digital audio data. For example, inFIG. 1 , the second decodeddigital audio data 118 including themetadata parameter 106 having thesecond value 120 is output by theaudio adjustment system 102. The second decodeddigital audio data 118 corresponds to the second encodeddigital audio data 112. The method ends at 610. - Referring to
FIG. 7 , an illustrative embodiment of a general computer system is shown and is designated 700. Thecomputer system 700 can include a set of instructions that can be executed to cause thecomputer system 700 to perform any one or more of the methods or computer based functions disclosed herein. Thecomputer system 700, or any portion thereof, may operate as a standalone device or may be connected, e.g., using a network, to other computer systems or peripheral devices, including a media content server or a set-top box device, as shown inFIG. 2 . - In a networked deployment, the computer system may operate in the capacity of a server, such as a video server or application server, or a set-top box device. The
computer system 700 can also be implemented as or incorporated into various devices, such as a personal computer (PC), a tablet PC, a set-top box (STB) device, a personal digital assistant (PDA), a mobile device, a palmtop computer, a laptop computer, a desktop computer, a communications device, a wireless telephone, a land-line telephone, a control system, a camera, a scanner, a facsimile machine, a printer, a pager, a personal trusted device, a web appliance, a network router, switch or bridge, or any other machine capable of executing a set of instructions (sequential or otherwise) that specify actions to be taken by that machine. In a particular embodiment, thecomputer system 700 can be implemented using electronic devices that provide voice, video or data communication. Further, while asingle computer system 700 is illustrated, the term “system” shall also be taken to include any collection of systems or sub-systems that individually or jointly execute a set, or multiple sets, of instructions to perform one or more computer functions. - As illustrated in
FIG. 7 , thecomputer system 700 may include aprocessor 702, e.g., a central processing unit (CPU), a graphics-processing unit (GPU), or both. Moreover, thecomputer system 700 can include amain memory 704 and astatic memory 706 that can communicate with each other via abus 708. As shown, thecomputer system 700 may further include avideo display unit 710, such as a liquid crystal display (LCD), an organic light emitting diode (OLED), a flat panel display, a solid-state display, or a cathode ray tube (CRT). Additionally, thecomputer system 700 may include aninput device 712, such as a keyboard, and acursor control device 714, such as a mouse. Thecomputer system 700 can also include adisk drive unit 716, asignal generation device 718, such as a speaker or remote control, and anetwork interface device 720. - In a particular embodiment, as depicted in
FIG. 7 , thedisk drive unit 716 may include a computer-readable medium 722 in which one or more sets ofinstructions 724, e.g. software, can be embedded. Further, theinstructions 724 may embody one or more of the methods or logic as described herein. In a particular embodiment, theinstructions 724 may reside completely, or at least partially, within themain memory 704, thestatic memory 706, and/or within theprocessor 702 during execution by thecomputer system 700. Themain memory 704 and theprocessor 702 also may include computer-readable media. - In an alternative embodiment, dedicated hardware implementations, such as application specific integrated circuits, programmable logic arrays and other hardware devices, can be constructed to implement one or more of the methods described herein. Applications that may include the apparatus and systems of various embodiments can broadly include a variety of electronic and computer systems. One or more embodiments described herein may implement functions using two or more specific interconnected hardware modules or devices with related control and data signals that can be communicated between and through the modules, or as portions of an application-specific integrated circuit. Accordingly, the present system encompasses software, firmware, and hardware implementations.
- In accordance with various embodiments of the present disclosure, the methods described herein may be implemented by software programs executable by a computer system. Further, in an exemplary, non-limited embodiment, implementations can include distributed processing, component/object distributed processing, and parallel processing. Alternatively, virtual computer system processing can be constructed to implement one or more of the methods or functionality as described herein.
- The present disclosure contemplates a computer-readable medium that includes
instructions 724 or receives and executesinstructions 724 responsive to a propagated signal, so that a device connected to anetwork 726 can communicate voice, video or data over thenetwork 726. Further, theinstructions 724 may be transmitted or received over thenetwork 726 via thenetwork interface device 720. - While the computer-readable medium is shown to be a single medium, the term “computer-readable medium” includes a single medium or multiple media, such as a centralized or distributed database, and/or associated caches and servers that store one or more sets of instructions. The term “computer-readable medium” shall also include any medium that is capable of storing, encoding or carrying a set of instructions for execution by a processor or that cause a computer system to perform any one or more of the methods or operations disclosed herein.
- In a particular non-limiting, exemplary embodiment, the computer-readable medium can include a solid-state memory such as a memory card or other package that houses one or more non-volatile read-only memories. Further, the computer-readable medium can be a random access memory or other volatile re-writable memory. Additionally, the computer-readable medium can include a magneto-optical or optical medium, such as a disk or tapes or other storage device to capture carrier wave signals such as a signal communicated over a transmission medium. A digital file attachment to an email or other self-contained information archive or set of archives may be considered a distribution medium that is equivalent to a tangible storage medium. Accordingly, the disclosure is considered to include any one or more of a computer-readable medium or a distribution medium and other equivalents and successor media, in which data or instructions may be stored.
- In accordance with various embodiments, the methods described herein may be implemented as one or more software programs running on a computer processor. Dedicated hardware implementations including, but not limited to, application specific integrated circuits, programmable logic arrays and other hardware devices can likewise be constructed to implement the methods described herein. Furthermore, alternative software implementations including, but not limited to, distributed processing or component/object distributed processing, parallel processing, or virtual machine processing can also be constructed to implement the methods described herein.
- It should also be noted that software that implements the disclosed methods may optionally be stored on a tangible storage medium, such as: a magnetic medium, such as a disk or tape; a magneto-optical or optical medium, such as a disk; or a solid state medium, such as a memory card or other package that houses one or more read-only (non-volatile) memories, random access memories, or other re-writable (volatile) memories. The software may also utilize a signal including computer instructions. A digital file attachment to e-mail or other self-contained information archive or set of archives is considered a distribution medium equivalent to a tangible storage medium. Accordingly, the disclosure is considered to include a tangible storage medium or distribution medium as listed herein, and other equivalents and successor media, in which the software implementations herein may be stored.
- Although the present specification describes components and functions that may be implemented in particular embodiments with reference to particular standards and protocols, the disclosure is not limited to such standards and protocols. For example, standards for Internet and other packet switched network transmission (e.g., TCP/IP, UDP/IP, HTML, HTTP) represent examples of the state of the art. Such standards are periodically superseded by faster or more efficient equivalents having essentially the same functions. Accordingly, replacement standards and protocols having the same or similar functions as those disclosed herein are considered equivalents thereof.
- The illustrations of the embodiments described herein are intended to provide a general understanding of the structure of the various embodiments. The illustrations are not intended to serve as a complete description of all of the elements and features of apparatus and systems that utilize the structures or methods described herein. Many other embodiments may be apparent to those of skill in the art upon reviewing the disclosure. Other embodiments may be utilized and derived from the disclosure, such that structural and logical substitutions and changes may be made without departing from the scope of the disclosure. Additionally, the illustrations are merely representational and may not be drawn to scale. Certain proportions within the illustrations may be exaggerated, while other proportions may be minimized. Accordingly, the disclosure and the figures are to be regarded as illustrative rather than restrictive.
- One or more embodiments of the disclosure may be referred to herein, individually and/or collectively, by the term “invention” merely for convenience and without intending to voluntarily limit the scope of this application to any particular invention or inventive concept. Moreover, although specific embodiments have been illustrated and described herein, it should be appreciated that any subsequent arrangement designed to achieve the same or similar purpose may be substituted for the specific embodiments shown. This disclosure is intended to cover any and all subsequent adaptations or variations of various embodiments. Combinations of the above embodiments, and other embodiments not specifically described herein, will be apparent to those of skill in the art upon reviewing the description.
- The Abstract of the Disclosure is provided with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. In addition, in the foregoing Detailed Description, various features may be grouped together or described in a single embodiment for the purpose of streamlining the disclosure. This disclosure is not to be interpreted as reflecting an intention that the claimed embodiments require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter may be directed to less than all of the features of any of the disclosed embodiments. Thus, the following claims are incorporated into the Detailed Description, with each claim standing on its own as defining separately claimed subject matter.
- The above-disclosed subject matter is to be considered illustrative, and not restrictive, and the appended claims are intended to cover all such modifications, enhancements, and other embodiments, which fall within the scope of the present disclosure. Thus, to the maximum extent allowed by law, the scope of the present invention is to be determined by the broadest permissible interpretation of the following claims and their equivalents, and shall not be restricted or limited by the foregoing detailed description.
Claims (21)
1-20. (canceled)
21. A method, comprising:
determining, by a computing device, a dynamic range of an analog sample of a digital audio signal; and
modifying, by the computing device, a parameter of the digital audio data when the determined dynamic range is below a threshold, wherein the parameter is usable to adjust a volume level of the digital audio signal.
22. The method of claim 21 , wherein the computing device is a set-top box device.
23. The method of claim 21 , wherein the computing device is a stand-alone digital audio decoder.
24. The method of claim 21 , wherein the determining is based on a signal level of the analog sample and a noise level of the analog sample.
25. The method of claim 24 , wherein the determining is based on a signal-to-noise ratio of the analog sample.
26. The method of claim 21 , wherein the parameter is a metadata parameter.
27. The method of claim 21 , wherein the parameter is a dialnorm parameter.
28. The method of claim 21 , further comprising:
determining, by the computing device, a dynamic range of a second analog sample of the digital audio signal; and
computing, by the computing device, a difference between the dynamic range of the analog sample and the dynamic range of the second analog sample;
wherein the modifying is performed based at least in part on the computed difference.
29. The method of claim 28 , wherein the second analog sample corresponds to an advertisement.
30. A non-transitory computer-readable medium having instructions stored thereon that, in response to execution by a computer-based system, cause the computer-based system to perform operations comprising:
receiving a signal including digital video and digital audio;
determining a dynamic range of an analog sample of the digital audio; and
modifying a parameter of the digital audio when the determined dynamic range is below a threshold, wherein the parameter is usable to adjust a volume level of the digital audio.
31. The non-transitory computer-readable medium of claim 30 , wherein the operations further comprise outputting a modified signal including the digital video and the digital audio having the modified parameter.
32. The non-transitory computer-readable medium of claim 31 , wherein the operations further comprise synchronizing the digital video with the digital audio having the modified parameter.
33. The non-transitory computer-readable medium of claim 30 , wherein the threshold is a user-selectable threshold.
34. The non-transitory computer-readable medium of claim 30 , wherein the parameter is a dialnorm parameter.
35. An apparatus, comprising:
at least one processor;
a computer-readable memory having instructions executable by the at least one processor to:
determine a first dynamic range of a first analog sample of a digital audio signal;
determine a second dynamic range of a second analog sample of the digital audio signal; and
modify a parameter of the digital audio data when a difference between the first dynamic range and the second dynamic range exceeds a threshold difference, wherein the parameter is usable to adjust a volume level of the digital audio signal.
36. The apparatus of claim 35 , wherein the instructions are further executable by the at least one processor to:
receive media content;
separate the received media content into encoded digital video data and encoded digital audio data; and
decode the encoded digital audio data to produce the digital audio data.
37. The apparatus of claim 35 , wherein the parameter is a dialnorm parameter.
38. The apparatus of claim 35 , wherein the first dynamic range is determined based on a signal-to-noise ratio of the first analog sample.
39. The apparatus of claim 38 , wherein the second dynamic range is determined based on a signal-to-noise ratio of the second analog sample.
40. The apparatus of claim 35 , wherein the first digital audio signal corresponds to desired media content, and wherein the second digital audio signal corresponds to an advertisement.
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US20100241258A1 (en) | 2010-09-23 |
US20100109926A1 (en) | 2010-05-06 |
US7755526B2 (en) | 2010-07-13 |
US8242942B2 (en) | 2012-08-14 |
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