11. Digital filters rely less on analog circuitry, potentially allowing for a better signal-to-noise ratio.12. Similar effects can also be achieved with digital filter effects. 13. There are two categories of digital filter : the recursive filter and the nonrecursive filter. 14. Many digital filters are designed to give low-pass characteristics. 15. There is an important difference between the design of 1-D and 2-D digital filter problems. 16. Like his codes, Hamming's digital filters became indispensable parts of the digital engineer's tool kit. 17. Analog signals can also be processed through digital filters by using Analog to Digital converters. 18. This can be accomplished using reference lines, envelope methods, digital filters , fractals or other techniques. 19. In addition to error correction, Hamming did pioneering work in digital filters while at Bell Labs. 20. Signal communication USB, RS232 and digital filters implementation
