1
J P Fricke, Ulrich R Muller: System for reproducing sound information. Flynn & Frishauf, December 6, 1977: US04061874 (39 worldwide citation)

In an environment of acoustic noise, such as a car radio playing in traffic or engine noise, both the volume (AGC) and dynamic range (Compression) of the audio amplifier are controlled by a local ambient acoustic noise sensor, such that gain is increased and dynamic range decreased simultaneously wi ...


2
John Usher, Steven Goldstein: Method and device to maintain audio content level reproduction. Personics Holdings, Pablo Meles, October 7, 2014: US08855343 (3 worldwide citation)

An earpiece and method to control a level of audio reproduction within an occluded ear canal are provided. The method includes the steps of measuring an ambient sound level from an Ambient Sound Microphone (ASM) at an entrance to an occluded ear canal, measuring a residual background noise level wit ...


3
BONGIOVI ANTHONY: SYSTEME ET PROCEDE DE TRAITEMENT DE SIGNAL NUMERIQUE, SYSTEM AND METHOD FOR DIGITAL SIGNAL PROCESSING. BONGIOVI ACOUSTICS, BONGIOVI ACOUSTICS, FETHERSTONHAUGH & CO, September 5, 2017: CA2785743 (2 worldwide citation)

The present invention provides for methods and systems for digitally processing an audio signal. In various embodiments, a method comprises receiving a profile comprising a plurality of filter equalizing coefficients, configuring a plurality of filters of a graphic equalizer with the plurality of fi ...


4
Ryotaro Aoki, Hideyuki Tokuhisa: Audio signal processing device with enhancement of low-pitch register of audio signal. Yamaha Corporation, Rossi Kimms & McDowell, October 21, 2014: US08868414 (2 worldwide citation)

An audio signal processing device is designed to enhance the low-pitch register of an audio signal by generating harmonics causing a missing fundamental effect with a light load of processing but without damaging an audio waveform. The audio signal processing device includes a filtering part (e.g. a ...


5
Larry V Craig, Michael T Burk: Audio system including multiband audio dynamics processor. Panasonic Automotive Systems Company of America Division of Panasonic Corporation of North America, Laurence S Roach Esq, October 6, 2015: US09154097 (1 worldwide citation)

An audio system includes a level controller receiving an input audio signal from an audio medium. The level controller includes a gain adjust module producing an output audio signal based on the input audio signal. A filter arrangement is communicatively coupled to the level controller. The filter a ...


6
Guillaume Potard: Method and system for controlling distortion in a critical frequency band of an audio signal. Dolby Laboratories Licensing Corporation, September 8, 2015: US09130527 (1 worldwide citation)

In some embodiments, a method and system for controlling distortion of the output of a miniature speaker by attenuating critical frequency band of the input signal to be reproduced, using tuning parameters that have been predetermined where the critical frequency band is a frequency range of the spe ...


7
Alan J Seefeldt: Techniques for distortion reducing multi-band compressor with timbre preservation. Dolby Laboratories Licensing Corporation, July 14, 2015: US09083298 (1 worldwide citation)

Distortion reducing multi-band compressor with timbre preservation is provided. Timbre preservation is achieved by determining a time-varying threshold in each of a plurality frequency bands as a function of a respective fixed threshold for the frequency band and, at least in part, an audio signal l ...


8
POTARD Guillaume: Procédé et système pour réguler une distorsion dans une bande de fréquence critique de signal audio, Method and system for controlling distortion in a critical frequency band of an audio signal. Dolby Laboratories Licensing Corporation, POTARD Guillaume, Dolby Laboratories, February 23, 2012: WO/2012/024144 (1 worldwide citation)

In some embodiments, a method and system for controlling distortion of the output of a miniature speaker by attenuating critical frequency band of the input signal to be reproduced, using tuning parameters that have been predetermined where the critical frequency band is a frequency range of the spe ...


9
Chih Chiang Cheng, Chun Min Lee, Hann Shi Tong, Lei Chen, Che Yi Hsiao, Chin Kuo Huang: Handheld electronic apparatus, sound producing system and control method of sound producing thereof. HTC Corporation, JCIPRNET, February 5, 2019: US10200000

A handheld electronic, a sound produce system and control method of sound producing thereof are provided. The sound produce system includes a speaker, a feedback unit, a gain unit and a compensation unit. The speaker generates audible sound according to an output audio signal. The feedback unit gene ...


10
Mark Robert Every: Automatically tuning an audio compressor to prevent distortion. 2236008 Ontario, Rowand, December 11, 2018: US10153744

A system and method automates the tuning of one or more multiband compressors or multiband limiters to minimize loudspeaker distortion. The system and method render one or more test loudspeaker signals that vary in frequency and in amplitude out of a loudspeaker and records the responses of the loud ...