modulation index

(redirected from Modulation Depth)
Also found in: Acronyms.

modulation index

[‚mäj·ə′lā·shən ‚in‚deks]
(communications)
The ratio of the frequency deviation to the frequency of the modulating wave in a frequency-modulation system when using a sinusoidal modulating wave. Also known as ratio deviation.
References in periodicals archive ?
Though it can be considered as an extension of the IBM patchwork technique, it has a great advantage over the latter in that the watermark modulation depth can be selected to be less under the same imperceptibility requirement.
As the modulation frequency increases, the switching response becomes quicker, but the modulation depth becomes less.
Due to its long read-range and its high modulation depth, the HITAG S IC developed by Philips Semiconductors is well suited for use in animal identification because it overcomes the large amounts of electronic noise and interference typically found in animal processing plants.
It is ideal for use with the resonant phase and amplitude modulators, providing up to 30 dBm of output power for high modulation depths (up to three radians) up to a frequency of 2.

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