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US6201873B1 - Loudspeaker-dependent audio compression ...
https://patents.google.com/patent/US6201873B1/en#:~:text=-%20Google%20Patents%20The%20invention%20is%20an%20audio,dependent%20upon%20the%20frequency%20content%20of%20the%20signal.
Frequency Dependent Compression - Effects Forum - KVR Audio
https://www.kvraudio.com/forum/viewtopic.php?t=565469
I think that a properly designed frequency dependent compressor should work this way. So we don't need the second stage (deemphasis or reemphasis). Sidechain is needed to fire attenuator on the main audio stream only. But this is my assumption. And nothing prevents us from doing this as with this video. P. S.
US6201873B1 - Loudspeaker-dependent audio …
https://patents.google.com/patent/US6201873B1/en
An audio compression system for connection to a loudspeaker exhibiting a frequency-dependent excursion response for signals having a constant amplitude, the system comprising: a …
US20110243343A1 - Frequency-dependent anr reference …
https://patents.google.com/patent/US20110243343A1/en
Apparatus and method of controlling provision of ANR, possibly of a personal ANR device, in which amplitudes of a piece of audio employed in the provision of …
Audio compression and noise | TV Tech
https://www.tvtechnology.com/miscellaneous/audio-compression-and-noise
Consider a digital audio data stream with an 18-bit resolution and a sampling frequency of 48kHz. The essential bit rate is equal to: 18 bits per sample × 48kHz = 864kb/s Six 5.1 audio channels and 18 bits per sample, as in ATSC, would result in a bit rate of 5.184Mb/s. It is obvious that compression is necessary for transmission purposes.
AUDIO AND VOICE COMPRESSION - NCSU
http://reeves.csc.ncsu.edu/Classes/csc557/2001-fall/lectures/audio-compression.pdf
• MPEG-I audio compression heavily exploits the properties of human hearing • Property #1: the threshold of hearing is frequency dependent — Established an “Absolute Threshold”, or “Quiet Threshold” • Property #2: masking of frequencies by other frequencies • Properties #1 + #2 Æ“Masking Threshold”
What is Audio Compression - A Comprehensive Guide - …
https://liemasf.com/news/what-is-compression
Interestingly, these compressors are also frequency-dependent, meaning the ratio of compression applied can vary across the frequency spectrum of your signal, applying more compression as the amplitude of one frequency range increases over another. The release function is also pretty slow; this has to do with the physics of the photocell attenuator.
US Patent for Loudspeaker-dependent audio compression ...
https://patents.justia.com/patent/6201873
An audio compression system for connection to a loudspeaker exhibiting a frequency-dependent excursion response for signals having a constant amplitude, the system comprising: a variable gain device for controllably varying an input audio signal in accordance with a control signal, thereby to produce an output audio signal for driving the loudspeaker;
A Tutorial on MPEG/Audio Compression - MIT Media …
https://web.media.mit.edu/~tristan/Classes/MAS.945/Papers/Technical/pan96tutorial.pdf
Although MPEG/audio compression is perfectly suitable for audio-only applications, it is actually one part of a three part compression standard. Combined with the other two parts, video and systems, the MPEG standard addresses the compression of synchronized video and audio at a total bit rate of about 1.5 Megabits/sec.
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