Receiver

A method of operating a receiver comprising a first oscillator, a second oscillator, a controller operable to control frequencies to which the first and second oscillators are tuned, and a discrimination circuit operable to receive and monitor transmitted signals, the method comprising:

• receiving, by the discrimination circuit, a signal at a first transmission frequency determined based on a first tuned frequency to which the first oscillator is tuned;
• determining, by the discrimination circuit in a capture time period of the first oscillator, whether data is being transmitted at the first transmission frequency;
• tuning, by the controller in a tuning time period, the second oscillator to a second tuned frequency;
• receiving, by the discrimination circuit, a signal at a second transmission frequency based on the second tuned frequency and determining, in a capture time period of the second oscillator, whether data is being transmitted at the second transmission frequency, the second tuned frequency being different to the first tuned frequency;
• and
• tuning, by the controller, in a further tuning time period, the first oscillator to a third tuned frequency being different to the second tuned frequency;
• the first and second oscillators being tuned in turn to one another, the second oscillator being tuned to the second tuned frequency during the capture time period of the first oscillator, the first oscillator being subsequently tuned to the third tuned frequency during the capture time period of the second oscillator, and
• wherein each tuning time period is shorter than each capture time period.

A computer program product for operating a receiver comprising a first oscillator, a second oscillator, a controller operable to control frequencies to which the first and second oscillators are tuned, and a discrimination circuit operatable to receive and monitor transmitted signals, the computer program product embodied in one or more non-transitory computer readable media having program instructions embodied therein, the program instructions executable by at least one processor to cause the at least one processor to:

• receive, by the discrimination circuit, a signal at a first transmission frequency determined based on a first turned frequency to which the first oscillator is tuned;
• determine, by the discrimination circuit in a capture time period of the first oscillator, whether data is being transmitted at the first transmission frequency;
• tune, by the controller in a tuning time period, the second oscillator to a second tuned frequency;
• receive, by the discrimination circuit, a signal at a second transmission frequency based on the second tuned frequency and determining, in a capture time period of the second oscillator, whether data is being transmitted at the second transmission frequency, the second tuned frequency being different to the first tuned frequency;
• and
• tune, by the controller, in a further tuning time period, the first oscillator to a third tuned frequency being different to the second tuned frequency;
• the first and second oscillator being tuned in turn to one another, the second oscillator being tuned to the second tuned french during the capture time period of the first oscillator, the first oscillator being subsequently tuned to the third tuned frequency during the capture time period of the second oscillator, and wherein each tuning time period is shorter than each capture time period.