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me of the more advanced units are now starting to allow syncing through a wireless connection such as via wi fi or bluetooth 74 content can also be obtained and placed on some daps such as the ipod touch or zune hd by allowing access to a store or marketplace most notably the itunes store or zune marketplace from which content such as music and video and even games can be purchased and downloaded directly to the device digital signal processing edit a growing number of portable media players are including audio processing chips that allow digital effects like 3d audio effects dynamic range compression and equalisation of the frequency response 75 76 77 78 some devices adjust loudness based on fletcher munson curves some media players are used with noise cancelling headphones that use active noise reduction to remove background noise de noise mode edit de noise mode is an alternative to active noise reduction it provides for relatively noise free listening to audio in a noisy environment in this mode audio intelligibility is improved due to selective gain reduction of the ambient noise this method splits external signals into frequency components by filterbank according to the peculiarities of human perception of specific frequencies and processing them using adaptive audio compressors operation thresholds in adaptive audio compressors in contrast to ordinary compressors are regulated depending on ambient noise levels for each specific bandwidth reshaping of the processed signal from adaptive compressor outputs is realised in a synthesis filterbank this method improves the intelligibility of speech signals and music the best effect is obtained while listening to audio in the environment with constant noise in trains automobiles planes or in environments with fluctuating noise level e g in a metro improvement of signal intelligibility in condition of ambient noise allows users to hear audio well and preserve hearing ability in contrast to regular volume amplification natural mode edit natural mode is characterised by subjective effect of balance of different frequency sounds regardless of level of distortion appearing in the reproduction device it is also regardless of personal user s ability to perceive specific sound frequencies excluding obvious hearing loss the natural effect is obtained due to special sound processing algorithm i e formula of subjective equalisation of frequency response function its principle is to assess frequency response function frf of mediaplayer or any other sound reproduction device in accordance with audibility threshold in silence subjective for each person 79 and to apply gain modifying factor the factor is determined with the help of integrated function to test audibility threshold the program generates tone signals with divergent oscillations from minimum volume 30 45 hz to maximum volume appr 16 khz 80 and user assess their subjective audibility the principle is similar to in situ audiometry used in medicine to prescribe a hearing aid however the results of test may be used to a limited extent as far as frf of sound devices depends on reproduction volume it means correction coefficient should be determined several times for various signal strengths which is not a particular problem from a practical standpoint sound around mode edit sound around mode allows for real time overlapping of music and the sounds surrounding the listener in their environment which are captured by a microphone and mixed into the audio signal as a result the user may hear playing music and external sounds of the environment at the same time this can increase user safety especially in big cities and busy streets as a user can hear a mugger following them or hear an oncoming car controversy edit further information itunes store the consumer council of norway eula challenge and digital rights management although these issues are not usually controversial within digital audio players they are matters of continuing controversy and litigation including but not limited to content distribution and protection and digital rights management drm lawsuit with riaa edit main article recording industry ass n of america v diamond multimedia systems inc the recording industry association of america riaa filed a lawsuit in late 1998 against diamond multimedia for its rio players 38 81 alleging that the device encouraged copying music illegally but diamond won a legal victory on the shoulders of the sony corp v universal city studios case and daps were legally ruled as electronic devices 82 risk of hearing damage edit according to the scientific committee on emerging and newly identified health risks the risk of hearing damage from digital audio players depends on both sound level and listening time the listening habits of most users are unlikely to cause hearing loss but some people are putting their hearing at risk because they set the volume control very high or listen to music at high levels for many hours per day such listening habits may result in temporary or permanent hearing loss tinnitus and difficulties understanding speech in noisy environments the world health organization warns that increasing use of headphones and earphones puts 1 1 billion teenagers and young adults at risk of hearing loss due to unsafe use of personal audio devices 83 many smartphones and personal media players are sold with earphones that do a poor job of blocking ambient noise leading some users to turn up the volume to the maximum level to drown out street noise 84 people listening to their media players on crowded commutes sometimes play music at high volumes feel a sense of separation freedom and escape from their surroundings 85 86 the world health organization recommends that the highest permissible level of noise exposure in the workplace is 85 db up to a maximum of eight hours per day and time in nightclubs bars and sporting events should be limited because they can expose patrons to noise levels of 100 db the report states teenagers and young people can better protect their hearing by keeping the volume down on personal audio devices wearing earplugs when visiting noisy venues and using carefully fitted and if possible noise cancelling earphones headphones they can also limit the time spent engaged in noisy activities by taking short listening breaks and restricting the daily use of personal audio devices to less than one hour with the help of smartphone apps they can monitor safe listening levels the report also recommends that governments raise awareness of hearing loss and to recommend people visit a hearing specialist if they experience symptoms of hearing loss which include pain ringing or buzzing in the ears 87 a study by the national institute for occupational safety health found that employees at bars nightclubs or other music venues were exposed to noise levels above the internationally recommended limits of 82 85 db a per eight hours this growing phenomena has led to the coining of the term music induced hearing loss which includes hearing loss as a result of overexposure to music on personal media players 88 fcc issues edit some mp3 players have electromagnet transmitters as well as receivers many mp3 players have built in fm radios but fm transmitters aren t usually built in due to liability of transmitter feedback from simultaneous transmission and reception of fm also certain features like wi fi and bluetooth can interfere with professional grade communications systems such as aircraft at airports 89 see also edit comparison of portable media players digital video recorder internet radio device mixtape notel portable dvd player walkman circ references edit what is dlna dlna archived from the original on 10 september 2013 1 archived 19 january 2016 at the wayback machine what are the differences in dlna device classes words to avoid or use with care because they are loaded or confusing gnu operating system free software 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