Multi-Notch Filter and Method for Multi-Notch Filtering
A system and method for multi-notch filtering for a communication device are provided. The system includes an input node to receive a signal directed to the communication device; a time delay element to delay the signal by a predetermined time delay; a summation element to sum the signal and the time-delayed signal; and a gain element to output the summed signal to the communication device.
1 . A system for multi-notch filtering for a communication device, comprising:
an input node to receive a signal directed to the communication device;
a time delay element to delay the signal by a predetermined time delay;
a summation element to sum the signal and the time-delayed signal; and
a gain element to output the summed signal to the communication device.
2 . The system according to claim 1 , further comprising:
a first buffer to buffer the signal prior to summation; and
a second buffer to buffer the time-delayed signal prior to summation.
3 . The system according to claim 1 , further comprising:
a second input node to receive the summed signal;
a second time delay element to delay the summed signal by a second predetermined time delay;
a second summation element to sum the summed signal and the time-delayed signal; and
a gain element to output the second summed signal to the communication device.
4 . The system according to claim 1 , further comprising an inverter element to invert the time-delayed signal prior to summation.
5 . The system according to claim 3 , further comprising a microcontroller circuit to control the predetermined and the second predetermined time delay.
6 . The system according to claim 5 , wherein the microcontroller controls the predetermined and the second predetermined time delays by setting a switchable capacitor bank.
7 . The system according to claim 1 , wherein the communication device is an AM receiving device.
8 . The system according to claim 1 , wherein the signal is interfered by one of at least: other broadcasts, lightning, power line noise, other car noises, or electrical motor noise.
9 . The system according to claim 1 , wherein the summation element is a low noise amplifier.
10 . A method for multi-notch filtering for a communication device, comprising:
receiving a signal directed to the communication device;
delaying the signal by a predetermined time delay;
summing the signal and the times-delayed signal; and
outputting the summed signal to the communication device.
11 . The method according to claim 10 , further comprising:
buffering the signal prior to summation; and
buffering the time-delayed signal prior to summation.
12 . The method according to claim 10 , further comprising:
receiving the summed signal;
delaying the summed signal by a second predetermined time delay;
summing the summed signal and the time-delayed signal; and
outputting the second summed signal to the communication device.
13 . The method according to claim 10 , further comprising inverting the time-delayed signal prior to summation.
14 . The method according to claim 13 , further comprising a microcontroller circuit to control the predetermined and the second predetermined time delay.
15 . The method according to claim 14 , wherein the microcontroller controls the predetermined and the second predetermined time delays by setting a switchable capacitor bank.
16 . The method according to claim 10 , wherein the communication device is an AM receiving device.
17 . The method according to claim 10 , wherein the signal is interfered by one of at least: other broadcasts, lightning, power line noise, other car noises, or electrical motor noise.
18 . The method according to claim 10 , wherein the summing is performed by a low noise amplifier.