PatentDOI
System and method for varying low audio frequencies inversely with audio signal level
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TLDR
In this paper, the authors proposed an auto loudness circuit for performing loudness compensation automatically depending on the signal level, which utilizes a filter circuit with the characteristic of a first order bass boost.Abstract:
The present invention relates to an auto loudness circuit for performing loudness compensation automatically depending on the signal level. When the signal level decreases, loudness compensation is slowly introduced and as the signal level increases, loudness compensation is quickly removed. To do so, the auto loudness circuit utilizes a filter circuit with the characteristic of a first order bass boost. The filter circuit maintains a corner frequency which is proportional to the inverse of audio level in order to mimic the Fletcher-Munson curves. Because the circuit employs a capacitance-multiplier with a first order resistance capacitance filter, the bass boost is inversely proportional to the signal level. Thus, bass boost is achieved automatically as the program content changes so that the listener is unaware of significant changes in program material as signal levels change either through increase or decrease in volume, crescendo or new material.read more
Citations
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Systems and methods for transducer calibration and tuning
James W. Wihardja,Mouna Elkhatib +1 more
TL;DR: In this article, the authors propose to use a digital signal processor (DSP) to compensate for audio transducers (headphones, speakers, microphones) that do not accurately reproduce the signal presented to them at the input.
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Dynamic bass boost apparatus and method
TL;DR: In this paper, a low-pass band select filter and a detector are used to detect a signal level representative of input signal level in a selected band and to generate the control signal in response to the detected signal level.
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Apparatus for processing an audio signal and method thereof
TL;DR: In this article, an apparatus for processing an audio signal and method thereof is described, which includes receiving a downmix signal and side information, extracting control restriction information from the side information; receiving control information for controlling gain or panning at least one object signal; generating at least the first multi-channel information and first downmix processing information based on the control information and object information.
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Level dependent bass management
TL;DR: The level dependent bass management system as mentioned in this paper utilizes audio input signal level information to apply at least one of multiple, available bass management solutions to generate one or more output signals from the input signal.
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Dynamic bass boost filter
TL;DR: In this article, a linear combination of an input audio signal and output of a high-pass filter is used to boost the bass frequencies of audio, which can be applied separately or in combination.
References
More filters
PatentDOI
Automatic dynamic equalizing
TL;DR: In this article, the output of a 2:1 compressor is coupled to inputs of the left and right output adders, respectively, by a bandpass filter having a transmission in the low bass frequency region centered at a frequency of about 60 Hz.
Patent
Loudness control circuit for an audio device
TL;DR: In this article, a loudness control circuit for an audio device used in a reproduction circuit for reproducing a music signal recorded on a recording medium comprises one or plural level detection circuits for detecting levels of signal components of low and high frequency regions of a reproduced signal and control circuits for controlling the levels of the signal components.
Patent
Multiband signal processor
TL;DR: In this article, a multiband analog audio processor is described which provides low peak-to-r.m.s. ratios and a distributed crossover configuration which employs bandpass filters with embedded clippers for high frequency processing.
PatentDOI
Loudness contour compensated hearing aid having ganged volume, bandpass filter, and compressor control
TL;DR: A hearing aid apparatus employs a network which varies the frequency response of the aid according to the listening level or the intensity of the audio signal propagating in the environment to enable the user to receive a processed signal which is compensated according to his particular loudness contours.
PatentDOI
Audio bass frequency enhancement
TL;DR: In this article, a low pass filter is used to pass only the bass components of the input signal and imparts a frequency dependent phase shift to the bass component, which is the result of a dynamically changing frequency response and increased duration of the bass frequencies.