Real-time MPEG audio layer 3 encoding

• Main Authors: Caparas, Joseph B., Pambid, Gerard Nicoli S., Gregorio, Jose Narciso S., Dyoco, Alvin John M.
• Format: text
• Language: English
• Published: Animo Repository 1999
• Subjects: MPEG (Video coding standard); Digital video > Standards; Sound > Recording and reproducing > Digital techniques; Video compression; Electrical and Electronics; Engineering
• Online Access: https://animorepository.dlsu.edu.ph/etd_bachelors/11355
• Institution: De La Salle University

Since the beginning of digital multimedia technology, efforts have been made to develop computer hardware and software that can replace analog audio/video recording and playback, the goal of which is to eliminate noise and degradation due to magnetic analog media. But with these advantages, converting analog audio/video signals to digital form has always required a lot of processing power and a lot of digital storage space, due to the large amount of digital data that is output from the conversion of a short analog sample. The more identical the converted digital sample to the analog sample is desired, the more processing and storage space is required. Recent developments in digital audio technology has been the birth of a new audio compression format that can shrink a 1 minute digital audio sampled at 44.1 KHz, 16 bit stereo, Pulse Coded Modulation (PCM) format or commonly known as WAVE file, from about 10 megabytes to about 1 megabyte of digital storage space, without audible degradation or loss. The MPEG Audio Layer 3 format, commonly known as MP3, has been developed by the Motion Pictures Experts Group (MPEG) of the International Standards Organization (ISO) and is currently the closest competitor for Compact Disc (CD) digital audio and other CD quality digital audio formats. Current software technology permits the compression of a WAVE file to this format as a separate step after converting the audio sample, usually from a CD or any other input to a WAVE file and stored to disk. As a result, this process takes a longer time than with single step conversion, in addition to the processing power required to finish a conversion. With an external co-processor, conversion from a WAVE file format straight to compressed MP3 format in a single step can be achieved, through software development. Available Digital Signal Processing (DSP) equipment can be used as the co-processors to accomplish this task.