Dolby Laboratories has patented a method for generating a modified bitstream in MPEG-4 audio format. The process involves embedding additional uncompressed PCM audio data into the bitstream using an MPEG-4 audio bitstream extension mechanism. This innovation enhances audio quality during transmission from source to sink devices. GlobalData’s report on Dolby Laboratories gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Dolby Laboratories, Cloud gaming was a key innovation area identified from patents. Dolby Laboratories's grant share as of April 2024 was 67%. Grant share is based on the ratio of number of grants to total number of patents.
Method for generating modified mpeg-4 audio bitstream
A recently granted patent (Publication Number: US11967330B2) discloses a method for generating a modified bitstream in MPEG-4 audio format by a source device. The method involves receiving a bitstream containing coded media data, generating payload of additional uncompressed PCM audio data, and embedding this payload in the bitstream using an MPEG-4 audio bitstream extension mechanism. The modified bitstream, including both the coded media data and the additional audio data, is then outputted to a sink device. The patent also covers methods for processing the modified bitstream at the sink device, which includes parsing the bitstream, core decoding the media data, mixing the core decoded media data with the additional audio data, and outputting the final signal.
Furthermore, the patent includes detailed claims related to generating information on the additional audio data, relative gain between the coded media data and the additional audio data, and processing the additional audio data through resampling, delay adaption, and loudness processing. The sink device is equipped with components such as a bitstream parser, core decoder, mixer, and control unit to effectively process the modified bitstream. Additionally, the patent covers the structure of the source device, which includes a receiver, embedder, and control unit, and the sink device, which includes a receiver, bitstream parser, core decoder, mixer, and control unit. The devices are designed to handle the modified bitstream efficiently, ensuring seamless integration of additional uncompressed PCM audio data into the MPEG-4 audio format.
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