The difference in the depth of modulation (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 expressed in microamperes.[citation needed] The two individual audio modulation frequencies and their associated sidebands are 90 and 150 Hz. The DDM for a localizer at the outer extremity of the course sector is 15.5% or an electric current equivalent of 150 microamperes full scale deflection.
^"Difference in the depth of modulation". Answers - the Most Trusted Place for Answering Life's Questions. McGraw-Hill Dictionary of Scientific and Technical Terms. In directive systems employing overlapping lobes with modulated signals, a ratio obtained by subtracting from the percentage of modulation of the larger signal the percentage of modulation of the smaller signal and dividing by 100.
and 23 Related for: Difference in the depth of modulation information
a phased array of co-located antennas.[citation needed] Differenceinthedepthofmodulation (DDM) Final approach Radio station Radiocommunication service...
'LOC' (or 'LLZ' prior to 2007.) AN/MRN-1 Andrew Alford Differenceinthedepthofmodulation (DDM) Localizer type directional aid (LDA) Simplified directional...
across the entire beam pattern, it is their relative differenceinthedepthofmodulation (DDM) that changes dependent upon the position ofthe approaching...
In digital audio using pulse-code modulation (PCM), bit depth is the number of bits of information in each sample, and it directly corresponds to the...
Thedepthof field (DOF) is the distance between the nearest and the furthest objects that are in acceptably sharp focus in an image captured with a camera...
bit of data; for example, this is not the case for modern modulation systems used in modems and LAN equipment. For most line codes and modulation methods:...
transmission chain. A variant, themodulation transfer function (MTF), neglects phase effects, but is equivalent to the OTF in many situations. Either transfer...
metrics such as modulationdepth, flicker percentage or flicker index are being applied for specifying the stroboscopic effect performance of lighting equipment...
is themodulationdepth and f m {\displaystyle f_{m}} is the frequency ofthe modulating signal, then for amplitude modulationthe two modulation phasors...
Signal, Interference, Noise, Propagation, Frequency of Fading, Depth, Modulation, and Overall. The move to plain-language radio communications means that...
determine the ability to detect the flicker: the frequency ofthemodulation; the amplitude or depthofthemodulation (i.e., what is the maximum percent...
are undesired effects inthe visual perception of a human observer induced by temporal light modulations. Two well-known examples of such unwanted effects...
encoded in a carrier wave in order to be transmitted, this is known as modulation. Popular analog modulation techniques include amplitude modulation and frequency...
the audio components ofthe signal don't appreciably influence gain; this prevents "modulation rise" which increases the effective modulationdepth of...
depth-of-field comparisons between formats are discussed, applying the formulae derived inthe article on depthof field. The depths of field ofthe three...
leaving themodulation, which was passed on to the user's headphones as an audible signal of dots and dashes. In 1904, Ernst Alexanderson introduced the Alexanderson...
while the phase ofthe other modulation signal is not, in order to serve as a reference. The receiver will demodulate both signals, and measure the phase...
Parseval's theorem. Themodulationdepth m is a convenient experimental parameter when assessing the total harmonic distortion inthe demodulated signal...
Global Information