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.