How does bone conduction work?

Bone conduction headphones (commonly referred to as ‘Bonephones’) are actually really clever. In order to best explain how they work, I’ll need to take you on a journey into the Human ear…

No, not literally. That would be disgusting.

OK, so you know how sound travels through the air? Surely you must have done that science experiment at school where you hear sound disappearing into an airless vacuum? Yup, it’s just like that. Continue reading

Inform, Entertain and Educate, Two-Way Radios in Broadcasting

The disparity between how easy it is to watch a television program and how difficult it is to make one is truly staggering.

Outdoor shoots are often rushed, always difficult and dependent on a number of factors completely outside of any Human control (principally: the weather). Managing a live broadcast outdoors is a difficult job that only highly trained professionals are properly equipped to deal with.

Mistakes can cost huge sums of money and even jobs to be lost in an instant. As a result, it is of absolutely paramount importance that an outdoor shoot runs as smoothly as possible. It is not possible to control all the variables in this equation, therefore the factors that are controllable need to be handled with a great deal of care and attention. Continue reading

Games pioneer John Carmack joins virtual reality headset firm

Latest news – The Band at Oculus are re-inventing the Virtual Reality Headset with their crowd funded Oculus Rift headset. John Carmack of half life, call of duty and Quake fame and a guru in 1st person shooters, has joined the Oculus company to progress a game, presumably a 1st person shooter, for the headset. Watch how this develops because the future of games may be in this appointment. Continue reading

Games pioneer John Carmack joins virtual reality headset firm

Latest news – The Band at Oculus are re-inventing the Virtual Reality Headset with their crowd funded Oculus Rift headset. John Carmack of half life, call of duty and Quake fame and a guru in 1st person shooters, has joined the Oculus company to progress a game, presumably a 1st person shooter, for the headset. Watch how this develops because the future of games may be in this appointment. Continue reading

Gupta: Cell phones, brain tumors and a wired earpiece

So to continue my run of content on this blog, I have decided to share one of our favourite posts this week. I used to be hesitant to add it to the blog because I actually didn’t wish to offend the initial writer, but I trust he/she is glad that I enjoyed reading their work and planned to share it with my readers.

By Dr. Sanjay Gupta, Chief Medical Correspondent

Just about every time I use a cell phone, I plug in my wired earpiece first. Having discussed the use of earpieces on several news shows, people expect to see me using one. If I am walking around the CNN studios, my colleagues often comment on it. In airports, people will stop me in the rare cases I forget to use the earpiece, and remind me about it. Perhaps, they are intrigued because I am a neurosurgeon who openly shows some concern about cell phones. Continue reading

Hotel Radio Communication

The tourism industry is a big one, with various holiday seasons bringing in huge revenues around the world, year in, year out. In some cases, tourism profits are actually vital to the survival of small towns and resort areas, as well as major factors in the host country’s GDP.

Approximately 30 Million people visit the UK from all over the world each year (and we don’t even get nice weather!). Drawn to our many sites of cultural interest, even more of historical interest, or just a slice on English country life, these tourists are actually a considerable part of our economy. Continue reading

Who Needs Spy Earpiece?

This piece is posted by the strict consent of radio accessory.com, that is the original site. please get consent from that blog before reposting this piece of writing.

 

Businessman. What is a successful businessman? It is a successful man who feels confident in front of a large audience. Successful businessman can exhibit his ideas in a convincing manner. And now the question? Do you think he has all these abilities given to him by nature? Of course, they aren’t! You can also feel persuasive and confident if you use spy gsm gadget. You can receive necessary information in real time by this gadget while carrying on negotiations. Continue reading

Innovative or Simply Post-Modern? New Paradigms in the Study of “Radio”

Radio is the wireless transmission of signals through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. These waves are called radio waves. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space.
Information, such as sound, is carried by systematically changing some property of the radiated waves, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.
Etymology
The etymology of “radio” or “radiotelegraphy” reveals that it was called “wireless telegraphy”, which was shortened to “wireless” in Britain. The prefix radio- in the sense of wireless transmission, was first recorded in the word radioconductor, a description provided by the French physicist Édouard Branly in 1897. It is based on the verb to radiate .
The word “radio” also appears in a 1907 article by Lee De Forest. It was adopted by the United States Navy in 1912, to distinguish radio from several other wireless communication technologies, such as the photophone. The term became common by the time of the first commercial broadcasts in the United States in the 1920s. The term was adopted by other languages in Europe and Asia. British Commonwealth countries continued to commonly use the term “wireless” until the mid-20th century, though the magazine of the BBC in the UK has been called Radio Times ever since it was first published in the early 1920s.
In recent years the more general term “wireless” has gained renewed popularity through the rapid growth of short-range computer networking, e.g., Wireless Local Area Network, Wi-Fi, and Bluetooth, as well as mobile telephony, e.g., GSM and UMTS. Today, the term “radio” specifies the actual type of transceiver device or chip, whereas “wireless” refers to the lack of physical connections; one talks about radio transceivers, but another talks about wireless devices and wireless sensor networks.
Processes
Radio systems used for communications will have the following elements. With more than 100 years of development, each process is implemented by a wide range of methods, specialized for different communications purposes.
Transmitter and modulation
Each system contains a transmitter. This consists of a source of electrical energy, producing alternating current of a desired frequency of oscillation. The transmitter contains a system to modulate some property of the energy produced to impress a signal on it. This modulation might be as simple as turning the energy on and off, or altering more subtle properties such as amplitude, frequency, phase, or combinations of these properties. The transmitter sends the modulated electrical energy to a tuned resonant antenna; this structure converts the rapidly changing alternating current into an electromagnetic wave that can move through free space.
Amplitude modulation of a carrier wave works by varying the strength of the transmitted signal in proportion to the information being sent. For example, changes in the signal strength can be used to reflect the sounds to be reproduced by a speaker, or to specify the light intensity of television pixels. It
was the method used for the first audio radio transmissions, and remains in use today. “AM” is often used to refer to the mediumwave broadcast band .
Frequency modulation varies the frequency of the carrier. The instantaneous frequency of the carrier is directly proportional to the instantaneous value of the input signal. Digital data can be sent by shifting the carrier’s frequency among a set of discrete values, a technique known as frequency-shift keying.
FM is commonly used at VHF radio frequencies for high-fidelity broadcasts of music and speech . Normal TV sound is also broadcast using FM.
Angle modulation alters the instantaneous phase of the carrier wave to transmit a signal. It is another term for Phase modulation.

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What police earpieces are available to civilians

There are quite a few police earpieces on the market right now, Renée, so the high likelihood is that whatever you need, someone, somewhere will be selling it. If it helps, I’ll give you a bit of an overview…

If you’re in the market for an overt earpiece, or even if you fancy something a bit more discreet (like, um, a covert earpiece), you’ll certainly be able to find it on the World Wide Web. Police organizations across the world employ a wide variety of communications equipment, from ‘listen only’ devices to PTT (Push To Talk) earpieces and, as I said, a significant portion of that equipment is available for consumer purchase. Continue reading