Head Phone By Yash jain ECE

Contents Introduction History Types of head phones Technology Advantages and disadvantages Applications

Introduction Headphones are a pair of small loud speakers, or less commonly a single speaker, with a way of holding them close to a user‘s ears and a means of connecting them to a signal source such as an audio amplifier radio or cd player. They are also known as stereo phones,head set or, colloquially cans. The in-ear versions are known as ear phone or ear bud. In the context of telecommunication, the term headset is used to describe a combination of headphone and micro phone used for two way communication for example with a telephone.

history headphones developed from the earpiece Brandes radio headphones, circa 1920 headphones used in telegraph and telephone work Headphone were part of vacuum plate

Types of head phone Circumaural: Circumaural headphones have large pads that surround the outer ear Supra-aural : They were commonly bundled with personal stereo during the 1980s. This type of headphone

ear bud canal phones: headphones of a much smaller size that are placed directly outside of the ear canal, but without fully enveloping it. canal phones: Provide one or more stock sleeve size to Fit various ear canals, which are Commonly made out of silicone rubber, elastomer or foam, for noise isolation.

Head set A headset is a headphone combined with a microphone. Headsets provide the equivalent functionality of a telephone handset with hands free operatheadsets are in console or PC gaming, Call centre and other telephone-intensive jobs and also for personal use at the computer to facilitate comfortable simultaneous conversation and typing.

Technology

Advantages and disadvantages prevent other people from hearing the sound either for privacy or to prevent disturbance They can also provide a level of sound. High quality headphones can have an extreme flat low frequency response down to 20 Hz within 3dB. Headphones are also useful for video games that use 3D positional audio processing algorithms, as they allow players to better judge the position of an off- screen sound source.

When the sounds from two speakers mix, they create the phase difference the brain t combine in this manner, the illusion of the phantom center can be perceived as lost. Using headphones at a sufficiently high volume level may cause temporary or permanent hearing impairment or deafness due to an effect called "masking." The government of France has imposed a limit on all music players sold in the country, they must not be capable of producing more than 100dBA the threshold of hearing damage during extended listening is 80dB, and the threshold of pain, or theoretically of immediate hearing loss, is 130dB.

applications Headphones can be used both with fixed equipment such as CD or DVD players, home theater personal computers and with portable devices like mp3 player . In the professional sector headphones are used in live situations by disc jockeys with a DJ mixer and sound engineering for monitoring signal sources. In radio studios, DJ’s use a pair of headphones when talking to the microphone while the speakers are turned off, to eliminate acoustic feedback and monitor their own voice.

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