A valve amplifier, or amp, is also called a tube amplifier due to the use of vacuum tubes to power it. The vacuum tube was originally produced in the 1930s and powered early telephone systems, computers and radar systems in World War II. The powerful tube was first used in a musical application when 1950s … Read more
Histogram matching converts the histogram, the profile of light and dark elements, in a target image to that of a reference image. It is used in image processing to adjust one or more images for better clarity, quality, or other traits. Computer programs can perform this procedure automatically when directed to do so by the … Read more
An LCD TV is a flat panel digital television that uses Liquid Crystal Display (LCD) technology verses the competing plasma technology or the older cathode ray tube (CRT) technology. LCD is also used in computer displays, and an LCD TV is simply a larger monitor with a built-in TV tuner, or with the ability to … Read more
A portable projection screen allows people to set up a projector at any location, for events like outdoor film screenings or classroom presentations. The screen breaks down into compact components for easy transport between sites. It comes with a support system to hold it up and anchor it in place. Many designs are available through … Read more
Technology offers many tools that can help make life easier. Keeping in touch with family members is just one of the many issues we face, and using Family Radio System (FRS) walkie talkies makes it easier in many ways. These devices are ideal for outings and trips as well as simple communication from upstairs to … Read more
Choose the best outdoor amplifier for your needs by determining the other equipment that it will be hooked up to, deciding how much power you need, and finding one in your price range. Since the amplifier will be outdoors, you also need to establish how much weatherproofing it needs to have, which depends on the … Read more
A general mobile radio service (GMRS) is a short distance, two way radio system used in the United States. GMRS radios are able to transmit and receive audio signals over a longer distance with less static interference than standard walkie-talkies. A GMRS radio is typically a hand held device that has a speaker, microphone and … Read more
PC headsets are simple devices that make it possible to initiate and receive audio communications through the personal computer. A basic PC headset will contain an earpiece that makes it easy for the operator to listen to inbound audio signals, and a microphone that allows the operator to verbally respond. Headsets of this type can … Read more
Freeview digital TV is Australia’s free digital television service that launched in October 2002. The general goal is for all Australian analog TV signals to convert to digital TV reception. Consumers with cable TV and digital satellite TV will still be able to view their favorite stations, but consumers who use an antenna for analog … Read more
A wireless home alarm system is a home alarm system in which the various components of the system are connected without the use of wires and do not require hard-wiring to function. Both hard-wired and wireless home alarm systems generally work in the same way and consist of similar components. There is a main console … Read more
Much like the game hide-and-seek, geocaching is a game in which people search for something hidden. Participants usually hide a small, waterproof container that contains a few small trinkets and a log with a pencil in a remote location. They then record its coordinates with a Global Positioning System (GPS) device. This code is then … Read more
A public address amplifier raises the volume of speech so people can be heard clearly in a large area or throughout a building. Inputs feed from one or more microphones through the device, which increases the power of the signal. The amplifier pushes the signal to outputs which relay the speech through speakers or horns, … Read more
A cable surge protector is a device intended for use between electrical and cable outlets and the devices plugged into them. One end of the device plugs into a wall outlet, often with a coaxial cable running from a wall outlet to the surge protector, and then other devices can plug into the surge protector. … Read more
There still exists much confusion about the way to buy digital TV since this may mean a few different things. Digital TV can refer to type of television set, the way it receives pictures, and the picture quality on the television. Alternately, people may want to know how they can receive digital TV broadcasting signals … Read more
Adaptive Multi-Rate (AMR) audio codec and Waveform (WAV) audio file format are two types of audio files that are used by different applications and devices. AMR audio files are commonly used by mobile phone handsets for recording and encoding speech, as well as for encoding ringtones. It is a patented audio format, and licenses to … Read more
A dual Subscriber Identity Module (SIM) Global System for Mobile communications (GSM) phone is a wireless phone that allows its owner to simultaneously use two SIM cards. This type of phone allows users to associate two separate numbers with a single device. Dual SIM GSM phones can be considered standby dual SIM phones or active … Read more
A triband world phone is a mobile phone that is able to work internationally because it has the technology to support phone calls on multiple frequencies. This term is used to refer to phones that use the global system for mobile communications (GSM) standard. GSM is used in most countries, with the notable exceptions of … Read more
As more radio stations across the world begin playing music in the HD Radio™ format, the demand for quality HD Radio™ tuners will continue to grow. Choosing the right HD Radio™ tuner is important to ensure that you get the best possible quality from your listening experience. To begin your search for the perfect HD … Read more
Television is a key element in many homes. While a great number of people subscribe to cable or satellite TV, many still watch local signals using an antenna on the roof or a smaller version that is connected directly to the television set. A two-pronged set antenna is often referred to as “rabbit ears” and … Read more
A solar LED light is a device that uses energy from the sun to power a lamp containing light-emitting diode (LED) bulbs. These lights collect solar energy through a photovoltaic panel, then store this energy until it is needed to power the lights. Solar lights are available in a wide variety of styles and finishes, … Read more