33 results about "Audio coding format" patented technology

Storing audio data encoded in any of a plurality of different audio encoding formats is enabled by parametrically defining the underlying format in which the audio data is encoded, in audio format and packet table chunks. A flag can be used to manage storage of the size of the audio data portion of the file, such that premature termination of an audio recording session does not result in an unreadable corrupted file. This capability can be enabled by initially setting the flag to a value that does not correspond to a valid audio data size and that indicates that the last chunk in the file contains the audio data. State information for the audio data, to effectively denote a version of the file, and a dependency indicator for dependent metadata, may be maintained, where the dependency indicator indicates the state of the audio data on which the metadata is dependent.

The present invention provides method and device for transcoding between audio coding formats with different time-frequency analysis domains, as used for example by MPEG-AAC and mp3, particularly for facilitated and faster transcoding between such audio signals. A method for transcoding a framed audio signal from a first parameter domain (PDA) into a second parameter domain (PDB) comprises linearly transforming (TT) two or more parameters of the first parameter domain (PDA) to at least one parameter of the second parameter domain (PDB), wherein the two or more parameters of the first parameter domain come from different frames of the audio signal in the first parameter domain. The linear transformation (TT) can be described as a matrix and implemented as a look-up table.

The present application provides a processing method for playing video files, the method comprising: storing the file encapsulation format, video encoding format, and audio encoding format of the target video file together with the file name as a file identifier; when receiving the target video When a file is requested to be played, the file identifier corresponding to the file name is read, so that the player performs initialization operations of demultiplexing, video decoding, and audio decoding for the target video file based on the file identifier. It can save the time of video files parsing video and audio encoding formats by traversing and parsing file encapsulation formats, directly hit all the information required for player initialization, increase the playback speed of video files, and improve user experience.

The invention discloses a method for guaranteeing subjective perception of VoLTE users. The method includes: obtaining the user's real objective perception service index and the voice media flow objective perception service index of each dial test task; obtaining each dial test task and the result of the dial test task Combining the objective perception service indicators of the voice media stream of the dialing test task, calculating the impairment parameters of each audio coding format; according to the real objective perception service indicators of the user, combined with the corresponding impairment parameters of the audio encoding format, obtaining And save the user's subjective perception damage reduction value; according to the user's complaint information, add a complaint label to the user's subjective perception damage reduction value, count the number of different complaints, and obtain the relationship between the number of complaints and the corresponding subjective perception damage reduction value Curve; set the tolerance value of user complaints, obtain the threshold of subjective perception damage reduction value corresponding to the tolerance value of user complaints according to the relationship curve, if the user’s subjective perception damage reduction value is greater than the threshold, generate user subjective Perceived impairment warning. The invention also discloses a VoLTE user subjective perception protection device.