From Analog to Digital: How a Low-Pass Filter Clears the Static
- Het Gala Technology has vastly improved how we communicate, starting with the first long-distance phone call in 1877. We've moved from unreliable analog systems, which were prone to static and broken lines, to the digital communication we use today. Digital communication, which became common in the 1990s, improved call clarity and reliability by converting continuous analog sound waves into a series of ones and zeros. Our voices are recorded digitally and then converted back to an analog signal when someone listens to it. The more samples taken during this conversion, the more accurately the reconstructed sound matches the original. A key component in this process is a low-pass filter . This filter helps improve call quality by allowing the essential frequencies of human speech (300 Hz - 3,300 Hz) to pass through while blocking unwanted high-frequency noise. I have written a code in PYTHON to illustrate how the noise can be removed, though in my code I have reduced the effect of...