matched filter


Also found in: Acronyms, Wikipedia.

matched filter

[′macht ′fil·tər]
(computer science)
In character recognition, a method employed in character property detection in which a vertical projection of the input character produces an analog waveform which is then compared to a set of stored waveforms for the purpose of determining the character's identity.
(electronics)
A filter with the property that, when the input consists of noise in addition to a specified desired signal, the signal-to-noise ratio is the maximum which can be obtained in any linear filter.
References in periodicals archive ?
An exception to the matched filter hypothesis: A mismatch of male call frequency and female best hearing frequency in a torrent frog.
The PAP simulation results obtained using simulation parameters highlighted in Table 1were plotted for the PAP technique Zero Forcing (ZF) and Matched Filter (MF) linear detectors.
As shown in Figure 5(b), we adopted the matched filter method to analyze the signal channel echo data using a forward model.
When the signal to be detected only has AWGN noise in it, the optimum filter for its detection is the Matched Filter. It is called a matched filter because it is the time-reversed and time-shifted version of the transmitted signal, hence the pre-requisite information required to build a matched filter is a sample or a template of the signal which is to be detected.
In this case, [B.sub.r] is the data rate, BW is the bandwidth, and [C.sub.m] and [G.sub.m], respectively, are the correlation coefficients and the gain of matched filter:
In this section, we introduce the basic concepts of bilateral filter (BLF) [7] and matched filter (MF) [11] for convenience of describing our method in Section 4.
As in the matched filter detection, this method is more robust to noise uncertainty than the energy detection.
For the input s(t), the matched filter output is given by equation (2):
In order to prevent such issues, matched filter reconstruction can be used [19], in which an estimate of f can be obtained from
We hypothesized, based on the matched filter hypothesis, river crayfish will be more successful and have more direct paths to the odor source when orienting under lotic conditions compared to lake crayfish.
* an inductance of the matched filter (matching filter).
Another common problem is pattern identification in multiple frames or images in order to perform alignment or merge operations [4][5][6].This problem is very similar to the identification of a specific digital signal in the processing signals field, by using, for example, a "matched filter".