Patent application number | Description | Published |
20090063159 | Audio Metadata Verification - A digital bitstream, comprising data bits representing audio, metadata intended to be correct for the audio, and metadata verification information, wherein all or part of the metadata may not be correct for the audio. The metadata verification information is usable to detect whether or not metadata is correct for the audio and, if not correct, to change it so that it is correct. The metadata verification information usable to detect and change metadata may include a copy, or a data-compressed copy, of a correct version of the metadata. | 03-05-2009 |
20090067644 | Economical Loudness Measurement of Coded Audio - Measuring the loudness of audio encoded in a bitstream that includes data from which an approximation of the power spectrum of the audio can be derived without fully decoding the audio is performed by deriving the approximation of the power spectrum of the audio from said bitstream without fully decoding the audio, and determining an approximate loudness of the audio in response to the approximation of the power spectrum of the audio. The data may include coarse representations of the audio and associated finer representations of the audio, the approximation of the power spectrum of the audio being derived from the coarse representations of the audio. In the case of subband encoded audio, the coarse representations of the audio may comprise scale factors and the associated finer representations of the audio may comprise sample data associated with each scale factor. | 03-12-2009 |
20090271185 | AUDIO-PEAK LIMITING IN SLOW AND FAST STAGES - A method and apparatus for limiting the absolute magnitude of an audio signal. The method may include firstly variable-gain reducing the gain of an audio signal, and then secondly variable-gain reducing the gain of the audio signal faster than the first variable-gain reduction, thereby limiting the absolute magnitude of the audio signal to a threshold. The first variable-gain reduction may include variable-gain reducing the gain of the audio signal in a first stage, and the second variable-gain reduction may include variable-gain reducing the gain of the audio signal in a second stage that reduces the gain faster than the first stage. The second variable-gain reduction may include delaying the audio signal, finding a peak among the delayed audio signal, calculating a fast gain from a found peak, and modifying the delayed audio signal with the calculated fast gain. | 10-29-2009 |
20090304190 | Audio Signal Loudness Measurement and Modification in the MDCT Domain - Processing an audio signal represented by the Modified Discrete Cosine Transform (MDCT) of a time-sampled real signal is disclosed in which the loudness of the transformed audio signal is measured, and at least in part in response to the measuring, the loudness of the transformed audio signal is modified. When gain modifying more than one frequency band, the variation or variations in gain from frequency band to frequency band, is smooth. The loudness measurement employs a smoothing time constant commensurate with the integration time of human loudness perception or slower. | 12-10-2009 |
20100042407 | HIGH QUALITY TIME-SCALING AND PITCH-SCALING OF AUDIO SIGNALS - In one alternative, an audio signal is analyzed using multiple psychoacoustic criteria to identify a region of the signal in which time scaling and/or pitch shifting processing would be inaudible or minimally audible, and the signal is time scaled and/or pitch shifted within that region. In another alternative, the signal is divided into auditory events, and the signal is time scaled and/or pitch shifted within an auditory event. In a further alternative, the signal is divided into auditory events, and the auditory events are analyzed using a psychoacoustic criterion to identify those auditory events in which the time scaling and/or pitch shifting processing of the signal would be inaudible or minimally audible. Further alternatives provide for multiple channels of audio. | 02-18-2010 |
20100250258 | Method for Correcting Metadata Affecting the Playback Loudness of Audio Information - A coded signal conveys encoded audio information and metadata that may be used to control the loudness of the audio information during its playback. If the values for these metadata parameters are set incorrectly, annoying fluctuations in loudness during playback can result. The present invention overcomes this problem by detecting incorrect metadata parameter values in the signal and replacing the incorrect values with corrected values. | 09-30-2010 |
20110219097 | Techniques For Client Device Dependent Filtering Of Metadata - Methods and apparatuses for media data communication for improved bandwidth utilization are provided. A client device communicates profile information to a server. The server maintains media content data and first metadata category information associated with the media content data. Based upon the profile information, a determination is made as to whether the client device is to utilize the first metadata category information. If to be utilized, media content data as well as the first metadata category information is provided to the client device. If a non-utilization determination is made, media content data is provided without the first metadata category information. In exemplary embodiments, first metadata category information can relate to any of the following: closed captioning, speaker virtualization, three dimensional rendering, global positioning, audio and/or video codecs, volume control, and the like. | 09-08-2011 |
20120063615 | EQUALIZATION PROFILES FOR DYNAMIC EQUALIZATION OF AUDIO DATA - Apparatuses for and methods of carrying out dynamic equalization processing of an audio signal, and apparatuses for and methods of controlling such equalization processing of the audio signal to dynamically adjust the time-varying spectrum of an audio signal to more closely match a user specified target time-invariant perceived audio signal spectrum while preserving the original dynamic range of the audio signal. The dynamic equalization is carried out according to a user-defined spectral profile specified by a control interface that allows a user to define, create, modify and/or apply the user-defined spectral profile. | 03-15-2012 |
20140270721 | UPSTREAM QUALITY ENHANCEMENT SIGNAL PROCESSING FOR RESOURCE CONSTRAINED CLIENT DEVICES - Methods, apparatuses and program logic in non-transitory media to process video data for quality enhancement. Information is accepted from a resource constrained device, e.g., a wireless portable device related to the quality enhancement and/or environmental quantities such as ambient lighting for the device. The video data is processed to achieve quality enhancement using at least some of the accepted information to generate processed output. The processing of the video data includes processing when or where one or more resources sufficient for the processing are available. | 09-18-2014 |