Both analog and digital signals are used to transfer information. The table compares the features of each. Analog Digital Wave Type Signal continuous, or "curvy", changes with time individually separate, or "box-like", also known as binary Uses cassette tapes, videotapes, record players, older cameras compact disks (CDs), digital video disks (DVDs), digital photos, cell phones Power Requirement higher, because of wide range of amplitudes and frequencies lower, because only two signals (the "one" and the "zero") are transmitted Storage degrades in quality with age and re-recordings quality remains the same over time Security lower, because tapping into an analog circuit can detect signals in their original form higher, since binary systems are easier to change to a secret code—known as encryption Images courtesy of NASA 4 Select the correct answer from each drop-down menu. Based on the information in the table, what type of signal is being transmitted and received in the image below? graph of transmitted signal in red and received signal in blue; the amplitude of the received signal is higher in some places and lower in others than the amplitude of the transmitted signal The image shows transmission of signal because there is of the transmitted signal. Transferring information using this type of signal requires .