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2. Frequency mixer - Wikipedia

   en.wikipedia.org/wiki/Frequency_mixer

   Frequency mixer. In electronics, a mixer, or frequency mixer, is an electrical circuit that creates new frequencies from two signals applied to it. In its most common application, two signals are applied to a mixer, and it produces new signals at the sum and difference of the original frequencies. Other frequency components may also be produced ...

3. Software-defined radio - Wikipedia

   en.wikipedia.org/wiki/Software-defined_radio

   Software-defined radio ( SDR) is a radio communication system where components that conventionally have been implemented in analog hardware (e.g. mixers, filters, amplifiers, modulators / demodulators, detectors, etc.) are instead implemented by means of software on a computer or embedded system. [ 1] While the concept of SDR is not new, the ...

4. Direct digital synthesis - Wikipedia

   en.wikipedia.org/wiki/Direct_digital_synthesis

   Direct digital synthesis ( DDS) is a method employed by frequency synthesizers used for creating arbitrary waveforms from a single, fixed-frequency reference clock. DDS is used in applications such as signal generation, local oscillators in communication systems, function generators, mixers, modulators, [ 1] sound synthesizers and as part of a ...

5. Frequency synthesizer - Wikipedia

   en.wikipedia.org/wiki/Frequency_synthesizer

   Frequency synthesizer. A frequency synthesizer is an electronic circuit that generates a range of frequencies from a single reference frequency. Frequency synthesizers are used in devices such as radio receivers, televisions, mobile telephones, radiotelephones, walkie-talkies, CB radios, cable television converter boxes, satellite receivers ...

6. Digital down converter - Wikipedia

   en.wikipedia.org/wiki/Digital_down_converter

   In digital signal processing, a digital down-converter ( DDC) converts a digitized, band-limited signal to a lower frequency signal at a lower sampling rate in order to simplify the subsequent radio stages. The process can preserve all the information in the frequency band of interest of the original signal. The input and output signals can be ...

7. Intermediate frequency - Wikipedia

   en.wikipedia.org/wiki/Intermediate_frequency

   Intermediate frequency. In communications and electronic engineering, an intermediate frequency ( IF) is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception. [ 1] The intermediate frequency is created by mixing the carrier signal with a local oscillator signal in a process called heterodyning ...

8. Local oscillator - Wikipedia

   en.wikipedia.org/wiki/Local_oscillator

   Local oscillator. In electronics, a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal. This frequency conversion process, also called heterodyning, produces the sum and difference frequencies from the frequency of the local oscillator and frequency of the input signal.

9. Harmonic mixer - Wikipedia

   en.wikipedia.org/wiki/Harmonic_mixer

   Harmonic mixer. The harmonic mixer and subharmonic mixer are a type of frequency mixer, which is a circuit that changes one signal frequency to another. The ordinary mixer has two input signals and one output signal. If the two input signals are sinewaves at frequencies f1 and f2, then the output signal consists of frequency components at the ...