The patent's assignee for patent number 8527267 is
News editors obtained the following quote from the background information supplied by the inventors: "This patent application describes a novel invention related to data compression. The invention described herein relates to the insertion of data into a previously encoded bit stream and to the extraction of such data. The data may be related or unrelated to the content of the previously encoded bit stream.
"The subject matter disclosed here may find particular application in the fields of broadcast and consumer audio. Modern distribution of audio signals to consumers involves the use of data rate reduction or audio compression techniques to lower the required amount of data required to deliver audio signals to consumers while causing minimal impact to the original audio quality. The reduction in the size of the data translates into savings of transmission and storage bandwidth, thereby allowing cost savings and/or carriage of more programs in a given space.
"Systems including AC-3, DTS, MPEG-2, AAC and AAC-HE are examples of common audio data reduction techniques. For the purposes of this application, the AC-3 system will be used as an example, but the invention may be applicable to any codec system, audio or video.
"Audio data compression lowers the amount of data required for transmission and/or storage of a given audio quality target. The resulting data produced by the compression process depends on the input audio and the audio quality target and, as such, it's data rate varies over time. Unused null, stuffing, or dummy bits may be inserted to maintain a constant output rate.
"This unused data space may be used to carry additional data. This technique is described in U.S. Pat. No. 6,807,528 ('Adding Data to a Compressed Data Frame') . A drawback of this approach is that continuous extra data may not always be available."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventor's summary information for this patent: "Data of any type may be inserted into an already encoded bit stream. Structure may be provided that: (i) accepts an incoming compressed data stream and inserts additional data that may be related to the compressed data stream; and/or (ii) accepts an incoming compressed data stream and inserts data that may not be related to the compressed data stream; and/or (iii) accepts an incoming compressed data stream and inserts null data for the purpose of smoothing or rate shaping the output bit rate or data frame length to a fixed value; and/or (iv) accepts an incoming data stream and modifies existing information present in the original bit stream indicating data rate to show a new data rate equal to the original data rate plus the inserted data rate; and/or (v) a structure that can be implemented in any encoded bit stream including an AC-3 encoded bit stream.
"In the case of AC-3, the data insertion process may be compatible with all professional and consumer decoders, and is transparent to all devices that transmit or otherwise carry AC-3 data from one point to another. Such devices may include so-called transport stream multiplexers which may be hardware or software based, DVD systems including both recorders and players, gaming devices, or any device capable of storing or replaying AC-3 data. Data can be inserted into bit streams with no need for decoding and re-encoding, and the data can be extracted without the need for decoding thereby preserving audio quality. Any data that is inserted can also be removed without decoding or re-encoding, thereby restoring the data rate to the original value. A constant data rate output may be created from bit stream inputs that may vary in data rate."
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