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Music and Computers - Columbia University
http://sites.music.columbia.edu/cmc/MusicAndComputers/chapter2/02_08.php#:~:text=Perceptually%20based%20sound%20compression%20algorithms%20usually%20work%20by,and%20important%20perception-based%20compression%20technique%20for%20sound%20data.
Perceptual Audio Compression - Stanford University
https://ccrma.stanford.edu/~jos/sasp/Perceptual_Audio_Compression.html
Perceptual Audio Compression It often happens that the model which is most natural from a conceptual (and manipulation) point of view is also the most effective from a compression point of view. This is because, in the ``right'' signal model for a natural sound, the model's parameters tend to vary quite slowly compared with the audio rate.
A Perceptually Based Audio Signal Model with Application ...
https://ccrma.stanford.edu/~jos/mus423h/Perceptually_Based_Audio_Signal.html
A Perceptually Based Audio Signal Model with Application to Scalable Compression Abstract (which is a bit long...) Audio delivery in network environments such as the Internet where bandwidth is not guaranteed, packet loss is common and where users connect to the network at various data rates demands scalable
Music and Computers - Columbia University
http://sites.music.columbia.edu/cmc/MusicAndComputers/chapter2/02_08.php
Perceptually based sound compression algorithms usually work by eliminating numerical information that is not perceptually significant and just keeping what’s important. µ-law ("mu-law") encoding is a simple, common, and important perception-based compression technique for sound data. It’s an older technique, but it’s far easier to explain here than a more sophisticated …
Data compression - CodeDocs
https://codedocs.org/what-is/data-compression
Perceptual coding is used by modern audio compression formats such as MP3 and AAC. Discrete cosine transform (DCT), developed by Nasir Ahmed, T. Natarajan and K. R. Rao in 1974, provided the basis for the modified discrete cosine transform (MDCT) used by modern audio compression formats such as MP3 and AAC.
Audio Compression - an overview | ScienceDirect Topics
https://www.sciencedirect.com/topics/computer-science/audio-compression
The incoming bit stream has been encoded using a Huffman-style code, which must be decoded. The audio data itself are applied to a reconstruction filter, along with a few other parameters. MP3 decoding can, for example, be executed using only 10% of an ARM7 CPU. Audio compression is a lossy process that relies on perceptual coding. The coder eliminates …
Lecture 7: Audio Compression & Coding - Columbia University
https://www.ee.columbia.edu/~dpwe/e6820/lectures/E6820-L07-coding-2up.pdf
Irrelevant data in audio coding • For coding of audio signals, irrelevant means perceptually insignificant - an empirical property • Compact Disc standard is adequate: - 44 kHz sampling for 20 kHz bandwidth - 16 bit linear samples for ~ 96 dB peak SNR •Reflect limits of human sensitivity: - 20 kHz bandwidth, 100 dB intensity
Data compression - Wikipedia
https://en.wikipedia.org/wiki/Data_compression
Perceptual coding is used by modern audio compression formats such as MP3 and AAC. Discrete cosine transform (DCT), developed by Nasir Ahmed, T. Natarajan and K. R. Rao in 1974, provided the basis for the modified discrete cosine transform (MDCT) used by modern audio compression formats such as MP3, Dolby Digital, and AAC.
Understanding Audio Data Compression - Universal Audio
https://www.uaudio.com/blog/understanding-audio-data-compression/
The higher the bitrate, the more data per second of music. As you’d expect, a higher bitrate creates better quality audio, along with a larger file. Generally speaking, 128 kbps (kilobits per second) is considered the bitrate at which an MP3 begins …
Perceptually Transparent Attachment Of Content-Based …
https://www.researchgate.net/publication/2526390_Perceptually_Transparent_Attachment_Of_Content-Based_Data_To_Audio-Visual_Documents
We present an audio codec for multiple, i.e., cascaded, lossy compression without degeneration of perceptual quality. Our coding scheme is based …
A Tutorial on MPEG/Audio Compression - MIT Media …
https://web.media.mit.edu/~tristan/Classes/MAS.945/Papers/Technical/pan96tutorial.pdf
audio. The MPEG/audio compression standard is one part of a multiple part standard that addresses the compression of video (11172-2), the compression of audio (11172-3), and the synchronization of the audio, video, and related data streams (11172-1) to an aggregate bit rate of about 1.5 Mbits/sec.
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