Digital Audio Player
Digital Audio Player Produce Great Sound
Digital audio players are constantly improving.The three main types of digital audio players are MP3 CD players that can play both data CDs and audio CDs with MP3 format files. Examples of digital audio players include mp3 digital audio player, mp4 digital audio player,and iPods.
According to testimony presented to Congress in 2005 regarding Medicare coverage of hearing aids and devices, preliminary observations about digital audio players revealed that the music reaching the eardrum topped 115 decibels. Hearing specialists say that exposure to noise that loud for more than 28 seconds per day, over time, can cause permanent hearing damage.
While many hearing specialists disagree, applying OSHA’s guidelines for the workplace indicates a little bit more flexibility about how long you can safely listen to your digital audio player before damaging your ability to hear. For every 5 dB increase in volume, the maximum exposure time is cut in half. 95 dB – 4 hours
100 dB – 2 hours
110 dB – 30 minutes
120 dB – 7.5 minutes
Using OSHA’s standards and the observable level of 115 dB listened to by many portable digital audio player users, the maximum time you should be listening to your audio player is about 15 minutes a day. Enjoy the great sound produced by your digital audio player today – but at safe levels that won’t jeopardize your enjoyment of life in the years to come.
What’s In An iPod – And Why Is It So Popular?
Unlike the iPod nano and the iPod shuffle which use flash memory, the iPod is designed around a central scroll wheel, with the full-sized models storing media on their internal hard-drive. Apple had decided to focus on technical capability, wanting the iPod to focus on the development on the iPod’s simple user interface, along with its ease of use. The iPod’s software for the iPod development was not developed in-house for this, but contracted PortalPlayer, who already had the reference design based on 2 ARM cores. The iPod can play several different formats: MP3, M4A/AAC, Protected AAC, AIFF, WAV, Audible audiobook, and Apple Lossless audio file formats. MIDI files cannot be played, but can be converted to audio files using the iTunes Advanced menu.
If the iPod is formatted on a Mac OS X computer, it uses the HFS Plus file system format; if it is formatted on Windows, the FAT32 is used because Windows cannot access HFS file systems. As of now there are four basic iPod models that you can find on major shopping websites: the iPod shuffle, iPod nano, iPod photo, and the brand new iPod video. Battery life is usually strong in the iPod with anywhere between 12-15 hour battery life (15 hours on the iPod Photo). Various hard drives are available for different versions of the iPod Photo, but a basic rule of thumb to remember with MP3 players is 2,500 songs per 10 GB.
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