- depth of frequency modulation
- 频率调制深度
Medical Chinese dictionary (湘雅医学词典). 2013.
depth of frequency modulation
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Modulation index — The modulation index (or modulation depth) of a modulation scheme describes by how much the modulated variable of the carrier signal varies around its unmodulated level. It is defined differently in each modulation scheme. See: Amplitude… … Wikipedia
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Amplitude modulation — Passband modulation v · d · e Analog modulation AM · … Wikipedia
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Difference in the depth of modulation — The difference in the depth of modulation or DDM is used by instrument landing systems in conjunction with the associated airborne receiving equipment to define a position in airspace.[1] DDM is usually expressed in percentage but may also be… … Wikipedia
Difference in the Depth of Modulation — or DDM is a method used by the Instrument Landing System in conjunction with the associated airborne receiving equipment to define a position in airspace. [ [http://stinet.dtic.mil/oai/oai?verb=getRecord metadataPrefix=html identifier=ADA138301… … Wikipedia
Audio bit depth — In digital audio, bit depth describes the number of bits of information recorded for each sample. Bit depth directly corresponds to the resolution of each sample in a set of digital audio data. Common examples of bit depth include CD audio, which … Wikipedia
Very low frequency — or VLF refers to radio frequencies (RF) in the range of 3 kHz to 30 kHz. Since there is not much bandwidth in this band of the radio spectrum, only the very simplest signals are used, such as for radio navigation. Also known as the myriameter… … Wikipedia
Space modulation — is a radio Amplitude Modulation technique used in Instrument Landing Systems that incorporates the use of multiple antennas fed with various radio frequency powers and phases to create different depths of modulation within airspace. This… … Wikipedia
