Signal detector with matched filter coefficient

A signal detector for detecting a first signal having a first frequency, comprising:

• a processor adapted to receive at least a first frame of time domain input samples at a sampling frequency;
• and
• a memory device coupled to the processor and adapted to store program instructions, that when executed by the processor:
• generate at least a first frequency energy value for the first frame based on at least a first subset of the time domain input samples and a first matched filter coefficient, wherein the sampling frequency is a non-integral multiple of the first frequency, and the first matched filter coefficient depends on the first frequency;
• generate at least a second frequency energy value for the first frame based on at least a second subset of the time domain input samples and a second matched filter coefficient;
• compare the first frequency energy value to a threshold energy value to determine the presence of the first signal;
• and
• compare the second frequency energy value to the threshold energy value to determine the presence of a second signal having a second frequency, wherein the sampling frequency is a non-integral multiple of the second frequency and the second matched filter coefficient depends on the second frequency.

A signal detector for detecting a first signal having a first frequency, comprising:

• a processor adapted to receive at least a first frame of time domain input samples at a sampling frequency;
• and
• a memory device coupled to the processor and adapted to store program instructions, that when executed by the processor:
• generate at least a first frequency energy value for the first frame based on at least a first subset of the time domain input samples and a first matched filter coefficient, wherein the number of samples in the first subset is between about 95 and 115, the sampling frequency is a non-integral multiple of the first frequency, and the first matched filter coefficient depends on the first frequency;
• and
• compare the first frequency energy value to a threshold energy value to determine the presence of the first signal.

A method for detecting at least a first signal having a first frequency, comprising:

• receiving at least a first frame of time domain input samples at a sampling frequency;
• generating at least a first frequency energy value for the first frame based on at least a first subset of the time domain input samples and a first matched filter coefficient, wherein the sampling frequency is a non-integral multiple of the first frequency, and the first matched filter coefficient depends on the first frequency;
• generating at least a second frequency energy value for the first frame based on at least a second subset of the time domain input samples and a second matched filter coefficient;
• comparing the first frequency energy value to a threshold energy value to determine the presence of the first signal;
• and
• comparing the second frequency energy value to the threshold energy value to determine the presence of a second signal having a second frequency, the second matched filter coefficient depending on the second frequency and the sampling frequency being a non-integral multiple of the second frequency.

A signal detector for detecting a first signal having a first frequency, comprising:

• means for receiving at least a first frame of time domain input samples at a sampling frequency;
• means for generating at least a first frequency energy value for the first frame based on at least a first subset of the time domain input samples and a first matched filter coefficient, wherein the sampling frequency is a non-integral multiple of the first frequency, and the first matched filter coefficient depends on the first frequency;
• means for generating at least a second frequency energy value for the first frame based on at least a second subset of the time domain input samples and a second matched filter coefficient;
• means for comparing the first frequency energy value to a threshold energy value to determine the presence of the first signal;
• and
• means for comparing the second frequency energy value to the threshold energy value to determine the presence of a second signal having a second frequency, the second matched filter coefficient depending on the second frequency and the sampling frequency being a non-integral multiple of the second frequency.

A method for detecting at least a first signal having a first frequency, comprising:

• receiving at least a first frame of time domain input samples at a sampling frequency;
• generating at least a first frequency energy value for the first frame based on at least a first subset of the time domain input samples and a first matched filter coefficient, wherein the number of samples in the first subset is between about 95 and 115, the sampling frequency is a non-integral multiple of the first frequency, and the first matched filter coefficient depends on the first frequency;
• and
• comparing the first frequency energy value to a threshold energy value to determine the presence of the first signal.