FDM

(communications)

FDM

(1) (Fused Deposition Modeling) See 3D printing.

(2) (Frequency Division Multiplexing) Transmitting multiple data signals simultaneously over a single channel. Each data stream (text, voice, video, etc.) is modulated onto a carrier with a unique center frequency by the multiplexor and demodulated at the receving end (see modulation and carrier). FDM works in both wired and wireless applications (see FDMA).

It Started in the 1930s
In the 1930s, the telephone companies began to use FDM to combine multiple analog voice signals over one line to maximize efficiency of their long distance trunks. During the 1960s, FDM was replaced with TDM, its digital counterpart (see TDM and channel bank).

Cable TV companies use FDM to transmit hundreds of channels of analog and digital TV as well as Internet over a single coaxial cable. The set-top box or TV tuner locks onto a particular frequency (channel) and demodulates the carrier to derive the data for the TV screen. The cable modem both modulates and demodulates the appropriate carriers to provide bi-directional operation for Internet access. See FDMA, OFDM, circuit switching and WDM.

Analog FDM vs. Digital TDM
FDM separates signals by using different carrier frequencies, whereas TDM (time division multiplexing) interleaves signals as in the following illustrations.

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References in periodicals archive

These results were similar to those of other researchers in the study of FDM processing parameters.

Study of Processing Parameters in Fused Deposition Modeling Based on Mechanical Properties of Acrylonitrile-Butadiene-Styrene Filament

Based on results given in Tables 3-12, it can be concluded that in the case of the posed problem the highest accuracy was achieved by applying the DQM, also in most cases the accuracy of the results obtained by the HWM is higher than that obtained by the FDM (there fundamental frequencies in Tables 3 and 7 are exceptions).

Free vibration analysis of a functionally graded material beam: evaluation of the Haar wavelet method

Reconstruction and Development of a 3D Printer Using FDM Technology.

Determination of FDM Printer Settings with Regard to Geometrical Accuracy

Like many companies, Flowserve first used FDM and FFF for development of its parts made via the investment casting process.

Jump starting 3-D printing with FDM, FFF: fused deposition modeling and fused filament fabrication technology offers a low-cost entry point to 3-D printed patterns

Print process simulation provides further insights into the residual stresses and performance of the 3D printed FDM part.

Stratasys to boost its 3D printing capabilities using Dassault Systemes' design and simulation

As an application to the FEM and FDM, we consider the following test case with the values M = 1, m = 1, K = 0.1, [P.sub.0] = 1, T = 0.25 fixed, and Y [member of] [-1,1].

Finite Element Solution of an Unsteady MHD Flow through Porous Medium between Two Parallel Flat Plates

Like FDM, SLS theoretically can work with any thermoplastic, as well as metal and ceramic powders, although polyamide and TPU are the most widely used plastic materials.

3D printing makes material advances: companies are stepping up their efforts to expand the limited palette of resins suitable for additive manufacturing

The RENUA Ireland President and his other half Mary shared [euro]559,068 from their financial services firm FDM in 2014 and [euro]652,144 in 2013.

EDDIE'S READIES; Consumer guru and wife earn [euro]1.2m in two years from firm

Joe Castro, a 69th Aerial Port Squadron air transportation specialist, attended a senior program management course offered by the FDM Group at its headquarters in London, England.

On the fast track: 459th ARW Reservist studies abroad to jumpstart his IT career

The US Patent Trial and Appeal Board of the United States Patent and Trademark Office (USPTO) has denied US-based 3-D printer manufacturer Afinia's requests for inter partes review of three FDM technology patents held by US-based 3-D Printing company Stratasys Ltd.

US Patent Office Board Denies Afinia Challenge to Stratasys 3-D Printing Patents