Frequency normalization of audio signals
First Claim
1. ) A method for manipulating a frequency response of an audio source, comprising:
- characterizing said frequency response of said audio source from an input signal;
storing said frequency response in a memory;
restoring missing frequency information to said input signal; and
producing an output signal having full range frequency information.
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Accused Products
Abstract
A system and method is provided to produce a flatter frequency response from an audio source that has a non-flat frequency response and, as such, has missing spectral content. The system and method achieves a flatter frequency response by characterizing the frequency response of the audio source based upon a reference input signal. This reference input signal is used to establish a reference frequency response, which is stored in a memory and used to select equalizer settings. The system restores missing spectral content by way of summing multiple input signals from the audio source. The system then normalizes the frequency response based on characterizations of the signal by utilizing equalizer settings from memory.
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Citations
19 Claims
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1. ) A method for manipulating a frequency response of an audio source, comprising:
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characterizing said frequency response of said audio source from an input signal;
storing said frequency response in a memory;
restoring missing frequency information to said input signal; and
producing an output signal having full range frequency information. - View Dependent Claims (2, 3, 4, 5)
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6. ) A method for processing an audio signal comprising:
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applying an analog input signal carried on multiple inputs to a differential input;
converting said analog input signal to a digital signal;
characterizing a frequency response of said digital signal;
determining if said digital signal possesses full frequency range information;
summing said multiple inputs to recover lost frequency information when said digital signal does not possess full frequency range information; and
producing an analog output signal possessing full range frequency information. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. ) A frequency normalization unit coupled between a head unit and an amplifier, comprising:
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a input section that receives an analog signal from said head unit that is carried multiple input channels;
an analog to digital converter that converts said analog signal to a digital signal;
a digital signal processor coupled to said analog to digital converter that characterizes a frequency response of said digital signal;
a microcontroller coupled to said digital signal processor, said microcontroller directs said digital signal processor to sum said multiple input channels to recover lost frequency information, thereby producing an audio signal with a full range frequency response; and
a digital to analog converter coupled to said digital signal processor that converts said audio signal to an audio analog signal. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification