System and method for filtering and detecting faint signals in noise
First Claim
1. A system for filtering differential signals, said system comprising:
- a signal receiver for receiving a differential signal;
a prefiltering network connected to said receiver for filtering said differential signal prior to amplification to reduce noise, said prefiltering network comprising;
a high-pass, low-pass, band-pass or band-reject filter; and
an amplifier connected to said filtering network for receiving and amplifying said filtered signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method for filtering and detecting faint signals in noise by placing a filter prior to an amplifier. In particular, a system for filtering differential signals includes: a signal receiver for receiving a differential signal; a prefiltering network connected to the receiver for filtering the differential signal prior to amplification, the prefiltering network including a high-pass filter and/or a low-pass filter; and an amplifier connected to the filtering network. In contrast with the conventional approach of connecting the filter to the amplifier'"'"'s inputs, the filtering network in a preferred embodiment of the invention is connected to the amplifier through the amplifier'"'"'s gain resistor such that the input impedance and common mode rejection ratio of the amplifier is not adversely affected by the filtering. Band-pass filtering prior to amplification reduces the noise in the signal and allows higher gain to provide a clearer signal following amplification.
-
Citations
20 Claims
-
1. A system for filtering differential signals, said system comprising:
-
a signal receiver for receiving a differential signal;
a prefiltering network connected to said receiver for filtering said differential signal prior to amplification to reduce noise, said prefiltering network comprising;
a high-pass, low-pass, band-pass or band-reject filter; and
an amplifier connected to said filtering network for receiving and amplifying said filtered signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A system for detecting EP signals, said system comprising:
-
at least two active electrodes;
a ground electrode connected to said at least two active electrodes for detecting said EP signal;
a prefiltering network provided in proximity to said ground electrode for receiving said EP signal and filtering noise from said EP signal; and
an amplifier also provided in proximity to said ground electrode and connected to said prefiltering network to receive and amplify said EP signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
-
18. A method for filtering differential evoked potential signals, said method comprising:
-
receiving a differential evoked potential signal; and
filtering said signal to reduce noise using a prefiltering network prior to amplification, said prefiltering network comprising a band-pass filter. - View Dependent Claims (19, 20)
-
Specification