Headphone audio enhancement system
First Claim
1. A method of enhancing audio for headphones, the method comprising:
- under control of a hardware processor;
receiving a left input audio signal;
receiving a right input audio signal;
applying a first notch filter to the left input audio signal to produce a left spatially-enhanced signal;
applying a first gain to the left input audio signal to produce an adjusted left input audio signal;
mixing at least a portion of the adjusted left input audio signal with the left spatially-enhanced signal to produce a left filtered signal;
applying a second notch filter to the right input audio signal to produce a right spatially-enhanced signal;
applying a second gain to the right input audio signal to produce an adjusted right input audio signal;
mixing at least a portion of the adjusted right input audio signal with the right spatially-enhanced signal to produce a right filtered signal;
obtaining a filtered difference signal from the left filtered signal and the right filtered signal; and
providing output signals to headphones based on the filtered difference signal.
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Accused Products
Abstract
An audio enhancement system can provide spatial enhancement, low frequency enhancement, and/or high frequency enhancement for headphone audio. The spatial enhancement can increase the sense of spaciousness or stereo separation between left and right headphone channels. The low frequency enhancement can enhance bass frequencies that are unreproducible or attenuated in headphone speakers by emphasizing harmonics of the low bass frequencies. The high frequency enhancement can emphasize higher frequencies that may be less reproducible or poorly tuned for headphone speakers. In some implementations, the audio enhancement system provides a user interface that enables a user to control the amount (e.g., gains) of each enhancement applied to headphone input signals. The audio enhancement system may also be designed to provide one or more of these enhancements more effectively when headphones with good coupling to the ear are used.
255 Citations
20 Claims
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1. A method of enhancing audio for headphones, the method comprising:
under control of a hardware processor; receiving a left input audio signal; receiving a right input audio signal; applying a first notch filter to the left input audio signal to produce a left spatially-enhanced signal; applying a first gain to the left input audio signal to produce an adjusted left input audio signal; mixing at least a portion of the adjusted left input audio signal with the left spatially-enhanced signal to produce a left filtered signal; applying a second notch filter to the right input audio signal to produce a right spatially-enhanced signal; applying a second gain to the right input audio signal to produce an adjusted right input audio signal; mixing at least a portion of the adjusted right input audio signal with the right spatially-enhanced signal to produce a right filtered signal; obtaining a filtered difference signal from the left filtered signal and the right filtered signal; and providing output signals to headphones based on the filtered difference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for enhancing audio for headphones, the system comprising:
a spatial enhancer comprising a hardware processor configured to; apply a first notch filter to a left input channel of audio to produce a left spatially-enhanced channel of audio; apply a first gain to the left input channel of audio to produce an adjusted left input channel of audio; mix at least a portion of the adjusted left input audio signal with the left spatially-enhanced signal to produce a left filtered channel of audio; apply a second notch filter to a right input channel of audio to produce a right spatially-enhanced channel of audio; apply a second gain to the right input channel of audio to produce an adjusted right input channel of audio; mix at least a portion of the adjusted right input audio signal with the right spatially-enhanced signal to produce a right filtered channel of audio; obtain a filtered difference signal from the left filtered channel of audio and the right filtered channel of audio; and output left and right output signals to headphones based on the filtered difference signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system for enhancing audio for headphones, the system comprising:
a hardware processor configured to; receive left and right audio inputs; obtain a difference signal from the left and right audio inputs; apply a notch filter to the difference signal to produce a spatially-enhanced audio signal; apply a gain to the difference signal to produce an adjusted audio signal; mix at least a portion of the spatially-enhanced audio signal and the adjusted audio signal to produce a filtered signal; obtain a sum signal by combining the left and right audio inputs; mix the sum signal with the filtered signal to produce left and right output signals; and output the left and right output signals to headphones. - View Dependent Claims (16, 17, 18)
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19. A method of enhancing audio for headphones, the method comprising:
under control of a hardware processor; receiving a left input audio signal; receiving a right input audio signal; applying a first notch filter to the left input audio signal to produce a left spatially-enhanced signal; applying a second notch filter to the right input audio signal to produce a right spatially-enhanced signal; obtaining a filtered difference signal from the left spatially-enhanced signal and the right spatially-enhanced signal; providing output signals to headphones based on the filtered difference signal; filtering the left and right input audio signals with at least two band pass filters to produce bass-enhanced audio signals; filtering the left and right input audio signals with a high pass filter to produce high-frequency enhanced audio signals; and mixing the filtered difference signal, the bass-enhanced audio signals, and the high-frequency enhanced audio signals to produce the output signals. - View Dependent Claims (20)
Specification