The students should not show their aliens to one another. Each group should have one of each of the five types of aliens. At each table, give each student a different analog alien page.(Five is the number of aliens provided in the set, and also provides optimum opportunities for students to draw the assigned aliens.)Īrrange students in groups of five. Organize into groups of five in a circle around a table.One copy of each of the 5 digital and 5 analog aliens per table (one alien type per human) from the Communication Signal Simulation Drawing Pages Teacher Set Up Communication Signal Simulation Drawing Pages. A black pen or fine tip marker (students should not be allowed multiple attempts to recreate the image) Students will perform two simulations: one simulating multiple transmissions of an analog signal, and one simulating multiple transmissions of a digital signal.Īnalog images are composed of rounded lines to represent that analog waves can have infinite values.ĭigital images are composed of straight lines that follow the grids on the handout representing how digital signals are composed of quantized values. This activity models the key differences between digital and analog signals in their resolution and signal fidelity. In this activity, students will simulate sending analog and digital signals, similar to the child’s game of “telephone,” but in the form of copying a series of drawings. Activity 1: Communication Signal Simulation Interior of StorageTek tape library at NERSC. Learn more about the features of data storage in the Science Friday series, File Not Found. Individuals also use data storage for personal use, like storing files, photos, games scores, and much more. Data storage is used by large companies like banks to store records. They also can be used to store information and data. These two signal types are used to communicate and send information in many different forms, like radio transmission, text messages, phone calls, streaming videos, and playing video games. The signal leaps from one value to another. Sound signals can vary smoothly in volume and pitch. Signals are composed of only two possible values: 0 or 1. Signals are composed of infinite possible values. Digital signals are a more reliable form of transmitting information because an error in the amplitude or frequency value would have to be very large in order to cause a jump to a different value. Digital waves have a step-like appearance.Īnalog signals are prone to distortion because even slight errors in amplitude or frequency of the wave will change the original signal. Digital signals, on the other hand, are composed of precise values of 1s and 0s. Analog signals are composed of continuous waves that can have any values for frequency and amplitude. Changes in frequency and amplitude create the music you listen to or images that you see on a screen. Digital Signalsĭigital and analog signals are transmitted through electromagnetic waves. In the following activities, we will learn more about the features of digital and analog signals by simulating how these two types of signals are transmitted and used to store information. If you’re listening to satellite radio, the signal is digital, but if you’re listening to broadcast or “over the air” radio the signal is analog. Radio, whether satellite or over the air, is transmitted as a signal that is interpreted by your device. If you’re listening to a local radio station, the music will turn to static, but if you’re listening to satellite radio, the music will completely go silent. You drive through a tunnel, and the music stops. You have the radio cranked up, and you’re all singing along to your favorite song. It’s finally summer! You and your family are on a cross-country road trip. A car driving out of the Zion-Mount Carmel tunnel located in Zion National Park, Utah.
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