Radio sensor for detecting wireless microphone signals and a method thereof
First Claim
1. A radio sensor (100) for detecting wireless microphone signals, comprising:
- a fast Fourier transform (FFT) module (130) for transforming an input signal into a frequency domain signal;
an accumulator (140) for accumulating the output signals of the FFT module (130); and
a decision unit (150) for comparing an output signal of the accumulator (140) to a predefined threshold and generating a message indicating a presence or an absence of a microphone signal based on the comparing result.
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Abstract
Wireless microphone signals are detected by processing an input signal to determine a number of frequency bins within a channel frequency band having an energy level above a first predefined threshold (S510); identifying locations of the frequency bins having an energy level above the first predefined threshold, when the number of bins is greater than zero (S520, S530); for each frequency bin having an energy level above the first predefined threshold, processing signals within a narrow frequency band of the frequency bin (S570); determining a number of signal peaks within the narrow frequency band that are above a second predefined threshold (S575); and generating a message indicating a presence or an absence of a microphone signal based on the number of signal peaks (S590, S595).
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Citations
15 Claims
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1. A radio sensor (100) for detecting wireless microphone signals, comprising:
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a fast Fourier transform (FFT) module (130) for transforming an input signal into a frequency domain signal; an accumulator (140) for accumulating the output signals of the FFT module (130); and a decision unit (150) for comparing an output signal of the accumulator (140) to a predefined threshold and generating a message indicating a presence or an absence of a microphone signal based on the comparing result. - View Dependent Claims (2, 3, 4)
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5. A radio sensor (300) for detecting microphone wireless signals, comprising:
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a fast Fourier transform (FFT) module (330) for transforming an input signal into a frequency domain signal; a frequency domain filter (340) for filtering an output signal of the FFT module (330); an accumulator (350) for accumulating the output signals of the frequency domain filter (340); and a decision unit (360) for comparing an output signal of the accumulator (340) to a predefined threshold and generating a message indicating a presence or an absence of a microphone signal based on the comparing result. - View Dependent Claims (6, 7, 8, 9)
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10. A method (500) for detecting wireless microphone signals, comprising:
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processing an input signal to determine a number of frequency bins within a channel frequency band having an energy level above a first predefined threshold (S510); identifying locations of the frequency bins having an energy level above the first predefined threshold, when the number of bins is greater than zero (S520, S530); for each frequency bin having an energy level above the first predefined threshold, processing signals within a narrow frequency band of the frequency bin (S570); determining a number of signal peaks within the narrow frequency band that are above a second predefined threshold (S575); and generating a message indicating a presence or an absence of a microphone signal based on the number of signal peaks (S590, S595). - View Dependent Claims (11, 12, 13, 14)
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15. A computer readable medium having stored thereof computer executable code for detecting wireless microphone signals, comprising:
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processing an input signal to determine a number of frequency bins within a channel frequency band having an energy level above a first predefined threshold (S510); identifying locations of the frequency bins having an energy level above the first predefined threshold, when the number of bins is greater than zero (S520, S530); for each frequency bin having an energy level above the first predefined threshold, processing signals within a microphone-signal frequency band of the frequency bin (S570); determining a number of signal peaks within the microphone-signal frequency band that are above a second predefined threshold (S575); and generating a message indicating a presence or an absence of a microphone signal based on the number of signal peaks (S590, S595).
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Specification