High frequency signal construction method and apparatus
First Claim
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1. A method of adding high frequency content to an input signal to form an augmented signal, the method comprising the steps of:
- (a) providing an input signal having a first predetermined lower spectral range;
(b) utilizing said input signal to form synthesized high frequency components of said input signal which extend beyond said lower spectral range;
(c) filtering said input signal with a low pass filter and filtering said synthesized high frequency components with a high pass filter;
(d) combining said high and low pass filtered signals to form said augmented signal.
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Abstract
A method of adding high frequency content to an input signal to form an augmented signal, the method comprising the steps of: (a) providing an initial signal having a first predetermined lower spectral range; (b) utilizing the initial signal to form synthesized high frequency components of the initial signal; (c) filtering the initial signal with a low pass filter and filtering the synthesized high frequency components with a high pass filter (d) combining the filtered signals to form the augmented signal.
60 Citations
16 Claims
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1. A method of adding high frequency content to an input signal to form an augmented signal, the method comprising the steps of:
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(a) providing an input signal having a first predetermined lower spectral range; (b) utilizing said input signal to form synthesized high frequency components of said input signal which extend beyond said lower spectral range; (c) filtering said input signal with a low pass filter and filtering said synthesized high frequency components with a high pass filter; (d) combining said high and low pass filtered signals to form said augmented signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of adding high frequency content to an input signal to form an augmented signal, the method comprising the steps of:
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(a) providing an input signal having a first predetermined lower spectral range; (b) utilizing said input signal to form synthesized high frequency components of said initial signal which extend beyond said lower spectral range, wherein step (b) further comprises; (i) for at least one portion of the input signal, determining the spectral range of said portion; (ii) extrapolating a high frequency end portion of the spectral range to form said synthesized higher frequency components of said signal. - View Dependent Claims (9, 10, 11, 12, 13)
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14. Apparatus for adding high frequency content to an input signal to form an augmented signal, the apparatus comprising:
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(a) a synthesizing processor for synthesizing high frequency components from an input signal having a first predetermined lower spectral range, said high frequency components extending beyond said lower spectral range; (b) a low pass filter for filtering said input signal; (c) a high pass filter for filtering said synthesized high frequency components; (d) a combiner for combining said high and low pass filtered signals to form said augmented signal. - View Dependent Claims (15)
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16. An apparatus for adding high frequency content to an input signal to form an augmented signal, the apparatus comprising:
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(a) a synthesizing processor for synthesizing high frequency components from an input signal having a first predetermined lower spectral range, said high frequency components extending beyond said lower spectral range; (b) means for dividing the input signal into a plurality of overlapping portions; (c) means for determining the spectral content of each of said overlapping portions; (d) means for extrapolating the high frequency end portion of the spectral content to form said synthesized high frequency components of said signal; (e) means for summing said synthesized high frequency components in a overlap-add fashion.
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Specification