Method for detecting a tone signal through digital signal processing
AssigneeConwise Technology Corporation Ltd.
InventorChau-Kai Hsieh
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Abstract
A method for detecting a tone signal having a predetermined tone frequency includes receiving an analog communication signal, using a sampling frequency to convert the analog communication signal into a digital communication signal, selecting a plurality of signal sectors corresponding to a predetermined frequency range of the digital communication signal where the predetermined tone frequency agrees with the predetermined frequency range, and using the number of samples of each signal sector to determine whether the analog communication signal contains the tone signal.
Claims12
A method for detecting a tone signal corresponding to a tone frequency with a radio communication device, the method comprising:
- receiving an analog communication signal, and using a sampling frequency for converting the analog communication signal to a digital speech signal comprising a plurality of signal sectors, wherein each signal sector corresponds to a period;
- selecting a plurality of first signal sectors corresponding to a predetermined frequency range from the digital speech signal in a frame time;
- and
- according to a selected first number of samples in each first signal sector, determining whether or not the analog communication signal comprises the tone signal corresponding to the tone frequency, wherein the tone frequency is located in the predetermined frequency range.
Dependencies are inferred from the claim text.