heterodyne frequency การใช้

The observer then uses a heterodyne frequency converter, as used in many bat detectors, to listen to a band around 40 kHz.
These unwanted frequencies, along with the unwanted heterodyne frequency, must be filtered out of the mixer output by an electronic filter to leave the desired heterodyne.
Instead 8mm recorded a sequence of four sine waves on each video track such that adjacent tracks would produce one of two heterodyne frequencies if the head mistracked.
The input signal for the analog tract is at the intermediate frequency or in the L-band, in the second case it must be firstly converted to IF . Then the signal is either I, Q " ) through multiplying it by the heterodyne frequency.
A heterodyne bat detector will only handle a small range of bat frequencies, so it is necessary to keep retuning the heterodyne frequency to find the point of maximum loudness or, in the case of bats with a hockey stick call, the frequency which gives the lowest sound.