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The band of frequencies occupied by all transmitted signals used to modulate the radio wave.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


A transmission medium through which digital signals are sent without frequency shifting. In general, only one communication channel is available at any given time.

Ethernet is an example of a baseband network.

See also broadband.
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Electronic data in their original form. Baseband refers to analog or digital data before being intermixed with other data. See multiplexing and modulation.

For Example
The output of an analog microphone is baseband. When an FM station's carrier frequency is stripped away in the radio (demodulated), the original audio signal that you hear is the baseband signal. See frequency modulation.

Ethernet transmission is considered baseband, because signals are not intermixed and occupy the full bandwidth of the line. In fact, "base" is part of the Ethernet version name (see 10Base-T and 100Base-T).

When a compressed digital audio signal such as MP3 is transcoded to another format, it is decompressed back to the original bit rate (the baseband signal) before it is compressed into the new format (for a specific example, see aptX). See baseband processor.

Baseband Video
In this cable TV set-top box manual, "baseband video" refers to the composite video signal from an analog VCR or camcorder, which comprises only video frames not intermixed with the audio. See composite video and carrier frequency.
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References in periodicals archive ?
Caption: Figure 12: Baseband signal eye diagram of 20GHz mm-wave after fiber transmission over (a) 10 km, (b) 20 km, (c) 30 km, (d) 40 km, and (e) BER versus transmission distance.
After frequency shift, the baseband signal is processed by down sampling with an integer factor D.
If the threshold condition is satisfied, the input selector block selects the input with the minimum PAPR and inputs the selected vector x(k) to the vector to serial converter that outputs the OFDM complex baseband signal. If the threshold condition is not satisfied, the process is repeated with a different selection of the dummy symbols.
The complex baseband signal [a.sub.RF](t) is frequency upconverted to a desired carrier frequency [f.sub.c] in the transmitter using a complex mixer.
The High Power Amplifier block applies memoryless nonlinearity to complex baseband signal and provides five different methods for modelling the nonlinearity.
In the "Satellite Transponder" the Satellite Receiver System Temperature block simulates the effects of thermal noise on a complex, baseband signal. Modelling was provided for two values of effective noise temperatures of 20 K (very low noise level) and 290 K (typical noise level) of satellite and ground station receiver systems.
In the above equation, [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is the discrete range profile; [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is the additive noise in the echo data; [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is the discrete convolution matrix constructed based on the complex baseband signal of transmitted subpulse s(t).
The OHPBNN model utilizes the baseband signal's in-phase and quadrature components as its inputs and outputs.
The relationship between the transmitted baseband signal s(n) and the lowpass equivalent front end signal [y.sub.l](n) shown in Figure 1 models the IQ imbalances and PA distortions.
For a certain baseband signal with normalized envelope range of 0.15-1.0, with [f.sub.C] less than 100 MHz, the [p.sub.min] and [DELTA]p of the CF-PWM mode are 0.75 ns and 0.04 ns, respectively, which could be recognized by the present PA.
Direct access to a built-in FFT analyzer mode allows baseband signal and (LF) noise analysis.