Method and system for signal synthesis
AssigneeSavant Technologies LLC
InventorDavid Gabbay
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Abstract
The invention describes methods and systems for digital synthesis of electric signals. According to the invention, one or more bit-patterns are provided, each indicative of a rectangular waveform having a characteristic frequency. Further to determining a selected signal frequency to be synthesized, a selected bit-pattern associated therewith is obtained. Bits of the selected bit-pattern are cyclically serialized to generate a substantially rectangular waveform signal comprising the characteristic frequency. Then, the signal is filtered to suppress spurious frequencies outside a certain unfiltered frequency band which corresponds to the selected bit-pattern to thereby obtain a filtered signal with prominent frequency component corresponding to the selected signal frequency.
Claims14
A method for digital synthesis of electric signals, the method comprising:
- a. providing one or more bit-patterns, each indicative of a rectangular waveform having a characteristic frequency;
- b. determining a selected signal frequency to be synthesized and obtaining a selected bit-pattern associated therewith;
- c. cyclically serializing bits of said selected bit-pattern to generate a substantially rectangular waveform signal comprising said characteristic frequency;
- and
- d. filtering said signal to suppress spurious frequencies outside a certain unfiltered frequency band which corresponds to said selected bit-pattern to thereby obtain a filtered signal with prominent frequency component corresponding to said selected signal frequency,
- wherein a Fourier spectrum of said rectangular waveform is characterized in that a ratio between a spectral power of said characteristic frequency and spectral powers of other frequencies within said unfiltered frequency band is higher than a certain Spurious free range (SFR) to be obtained in said filtered signal.
A method for digital synthesis of electric signals, the method comprising:
- a. providing one or more bit-patterns, each indicative of a rectangular waveform having a characteristic frequency;
- b. determining a selected signal frequency to be synthesized and obtaining a selected bit-pattern associated therewith;
- c. cyclically serializing bits of said selected bit-pattern to generate a substantially rectangular waveform signal comprising said characteristic frequency;
- and
- d. filtering said signal to suppress spurious frequencies outside a certain unfiltered frequency band which corresponds to said selected bit-pattern to thereby obtain a filtered signal with prominent frequency component corresponding to said selected signal frequency,
- wherein said cyclic serialization of bits from said selected bit-pattern is performed by repeatedly determining a cyclic phase value and serializing a corresponding bit of said selected bit pattern.
A method for digital synthesis of electric signals, the method comprising:
- providing one or more bit-patterns, each indicative of a rectangular waveform having a characteristic frequency;
- b. determining a selected signal frequency to be synthesized and obtaining a selected bit-pattern associated therewith;
- c. cyclically serializing bits of said selected bit-pattern to generate a substantially rectangular waveform signal comprising said characteristic frequency;
- and
- d filtering said signal to suppress spurious frequencies outside a certain unfiltered frequency band which corresponds to said selected bit-pattern to thereby obtain a filtered signal with prominent frequency component corresponding to said selected signal frequency,
- wherein said one or more bit patterns have an identical hit-length (M) and wherein at least one bit-pattern, indicative of a rectangular waveform having a characteristic frequency, is in a form of a modified series of M single-bit samples, sampled at fixed-intervals from a repeating waveform containing said characteristic frequency and said series is modified to suppress spurious frequencies within a certain unfiltered frequency band surrounding said characteristic frequency.
A method for digital synthesis of electric signals, the method comprising:
- a. providing, one or more bit-patterns, each indicative of a rectangular waveform having a characteristic frequency;
- b. determining a selected signal frequency to be synthesized and obtaining a selected bit-pattern associated therewith;
- c. cyclically serializing bits of said selected bit-pattern to generate a substantially rectangular waveform signal comprising said characteristic frequency;
- and
- d. filtering said signal to suppress spurious frequencies outside a certain unfiltered frequency band which corresponds to said selected bit-pattern to thereby obtain a filtered signal with a prominent frequency component corresponding to Said selected signal frequency,
- wherein said characteristic frequency and said prominent frequency are substantially equal to said selected signal frequency.
A method for digital synthesis of electric signals, the method comprising:
- a. providing one or more bit-patterns, each indicative of a rectangular waveform having a characteristic frequency;
- b. determining a selected signal frequency to be synthesized and obtaining a selected bit-pattern associated therewith;
- c. cyclically serializing bits of said selected bit-pattern to generate a substantially rectangular waveform signal comprising said characteristic frequency;
- d. filtering said signal to suppress spurious frequencies outside a certain unfiltered frequency band which corresponds to said selected bit-pattern to thereby obtain a filtered signal with a prominent frequency component corresponding to said selected signal frequency;
- and
- e. applying frequency up-conversion to said filtered signal to obtain a signal with said selected signal frequency.
A method for digital synthesis of electric signals, the method comprising:
- a. providing one or more bit-patterns, each indicative of a rectangular waveform having a characteristic frequency;
- b. determining a selected signal frequency to be synthesized and obtaining a selected bit-pattern associated therewith;
- c. cyclically serializing bits of said selected bit-pattern to generate a substantially rectangular waveform signal comprising said characteristic frequency;
- and
- d. filtering said signal to suppress spurious frequencies outside a certain unfiltered frequency band which corresponds to said selected bit-pattern to thereby obtain a filtered signal with a prominent frequency component corresponding to said selected signal frequency,
- wherein a signal obtained from said selected bit-pattern is filtered utilizing a band pass filter selected according to the frequency associated with said bit-pattern.
A method for designing a frequency pattern including a sequence of bits, the frequency pattern represents sequential samples in time of a repeating waveform whose discrete Fourier transform defines a frequency spectrum, the frequency pattern waveform is filtered by a filter to produce a sine-wave signal having a characteristic frequency, the method comprising:
- a. determining a number of bits included in said sequence of bits;
- b. computing an initial frequency pattern including computing initial values for bits included in said sequence of bits;
- c. evaluating the effect of bit flips in the initial frequency pattern, thereby creating a modified frequency pattern, applying discrete Fourier transform to the waveform represented by the modified frequency pattern and determining the amplitudes of frequencies in a resulting frequency spectrum;
- and
- d. selecting a frequency pattern that corresponds to a frequency spectrum having substantially high amplitude of the characteristic frequency while signal frequencies near the characteristic frequency have acceptably low amplitude levels.
Dependencies are inferred from the claim text.