Frequency scanning receiver
AssigneeGeneral Research of Electronics, Inc.
InventorsSadanori Shitara, Kiyoshi Wakui, Nobuaki Yokoyama
Life of this patent
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Abstract
A frequency scanning receiver not requiring the time for setting the frequency of the PLL of the first local oscillator and using a method capable of setting the receiving frequency in a simple circuit configuration, wherein the frequency scanning receiver is configured so that in the case where the reference frequency of the PLL of the first local oscillator has been set at a high frequency, when the frequency error is less than the second IF, it is configured so that the frequency error is controlled to be zero by the control circuit switching the frequency of the second local oscillator or the third local oscillator to an appropriate frequency using an output of the frequency discriminator.
Claims2
A frequency scanning receiver having a first local oscillator using a Phase Locked Loop (PLL), a second local oscillator, a Nth local oscillator (N denotes a positive integer), a frequency discriminator and so forth, wherein
- the frequency scanning receiver comprises control means for determining an error frequency corresponding to an output of the frequency discriminator at a time of channel selection and controlling the output to be zero by switching frequencies of local carrier waves outputted by the second or Nth local oscillator.
Dependencies are inferred from the claim text.