Credit: ccarlstead CC-BY 2.0. Playing cards developed their four-suit design in the 1480s in France. By the late 1800s, factories mass-produced standard English playing cards that featured diamonds, hearts, clubs and spades, a design that prevails as of September 2014. Older cards were based on Latin suits of cups, swords, coins and rods.
Definition - What does Spread Spectrum mean? Spread spectrum is a technique used for transmitting radio or telecommunications signals. The term refers to the practice of spreading the transmitted signal to occupy the frequency spectrum available for transmission.
Understanding Radios. I've been thinking about making my own radio. I understand fixed-frequency radios are the simplest and easiest, but a colleague is recommending a spread-spectrum radio instead.Now I hear that there are two flavors of spread spectrum: frequency hopping and direct sequence.s the name implies, the carrier frequency is fixed. With these, the sensor information is placed onto the carrier signal using amplitude modulation (AM), frequency modulation (FM), or phase modulation (PM) techniques, or some combination thereof.