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heterodyning    
n. 外差

外差


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  • software defined radio - Understanding how quadrature heterodyning . . .
    A less mathematical answer, this sentence: "Then, if there is a modulated (say AM modulated with voice) frequency of interest, we can tune the LO to the carrier frequency, and because of heterodyning principles we are now only having to deal with the baseband frequencies, which is much easier cheaper to digitize "
  • software defined radio - Heterodyning complex values in gnuradio . . .
    In order to demonstrate heterodyning, I set up a flow-graph consisting of 2 signal generators, a Multiply block, and QT GUI Frequency Sink The generators are connected to the Multiply block inputs, and the Multiply block output is connect to the Freq Sink, in order to heterodyne the two generator signals
  • software defined radio - SDR: How are I and Q determined from the . . .
    The slice is taken by quadrature heterodyning mixing (with a quadrature local oscillator (LO) near the frequency slice of interest), thus producing two signals This pair of mixer results is typically low pass filtered, then sampled by 2 ADCs, usually at a much lower rate than the LO frequency, to produce sampled IQ data suitable for software
  • What is a direct sampling superheterodyne receiver?
    This is because a direct sampling receiver can have such a wide bandwidth, that a (usually complex) heterodyning mixer (or two or more!, often inside an FPGA) might be required to pre-process the data so that an affordable DSP or CPU can finish the SDR processing
  • LSB modulation and demodulation - Amateur Radio Stack Exchange
    A USB signal is basically a baseband signal shifted up in frequency This is not accurate @ScottEarle points out that SSB can be produced by filtering out the carrier and undesired sideband from an AM signal, but that AM signal was generated at an intermediate frequency (IF), not at baseband; the baseband signal was used to modulate an IF carrier to produce the AM which was filtered to
  • software defined radio - How is the Hackrf able to achieve 20MHz of . . .
    Thus the rate of information gathered is double from a just scalar sampling at 22 MHz The 90 degree offset between the 2 IQ sample components allows capturing phase information that can help a complex FFT (et al ) differentiate between what would have been aliasing between spectrum above and below the heterodyning LO frequency
  • How much of its receive spectrum is an IC-7300 or similar radio . . .
    The IC-7300 receive section works in stages; the first stage is all-analogue, and consists of the attenuator, followed by a set of analogue filters to remove power outside the band of interest, followed by the pre-amp
  • Explanation of VFO as one part of the the tuning variables in mixers
    An RTL-SDR, as typically used by many SDR applications, is actually a double or triple conversion superhet, with one VFO (actually variable) digitally synthesized in the tuner chip for heterodyning down to an IF, another digitally synthesized fixed frequency quadrature oscillator for heterodyning IF samples down to baseband IQ for transfer over
  • superheterodyne - How is the IF for a superhet selected? - Amateur . . .
    There seem to be almost as many choices for the intermediate frequency (IF) as there are superheterodyne receivers and transceivers out there The ones I have come across are 455 kHz, 452 kHz, 1 6
  • Why do we use LSB below 10 MHz and USB above 10 MHz when operating SSB . . .
    Unfortunately, this is an incorrect answer, but one which I believed as legend until I recently simulated the heterodyning of an SSB signal up and down in frequency The "sense" of the sideband does not change, regardless of the "direction" of the frequency conversion





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