Weak current College】 【mp4 common terminology features all-party details】.

<br> <br> With mp3/mp4 's continued price and promotions for spring, many young people, especially students of my friends are particularly want to have your own mp3/mp4 Walkman, but for many players, mp3/mp4 although digital .products belong to the technical content of a lower class of products, but in the face of all kinds of mp3/mp4, its connotations are arguments about? the following author put mp3/mp4 Walkman common features and terminology for everyone to do detailed explanations in .the hope that people buy products when useful. <br> <br> <br> Technical parameters of the class <br> <br> <br> ★ Built-in Flash <br> Mp3/mp4 's most value are mp3 / .mp4 's size. From the early <br> 16M <br> Now, 32M 64M, 128M, 256M, and has appeared in 512M. In General, play with home-style 128Kbps <br> Compression <br> Rate of mp3 / .mp4 each song about 3-5M, so now the mainstream 128M memory can hold such songs about 30 first. 2003 128M capacity already became the mainstream standard, by the end of 2004 are likely to reach this target 256M. However there exists some mp3 / .mp4 and actual storage capacity <br> Callout <br> Capacity of phenomena, when the purchase. <br> ★ Expanded memory <br> The equivalent of your own to add capacity to the computer. The difference is the increase of Flash based mp3 ./ mp4, you can have a CF card, SM card, multimedia card, SD card etc. CF card is the early mp3/mp4, now because of the volume and power consumption, is rarely used; SM card should be considered at present mp3 ./ mp4 with most of the expansion card, MMC card in the case of the second generation of the expansion card, use it more; SD card is in the MMC card developed on the basis, so it is also backward compatible - that is if .your mp3/mp4 support SD card, so it can also support the MMC card, MMC card slot, mp3/MP4 SD card is not supported. In addition to the above cited several cards, <br> SONY <br> A dedicated memory stick .(Memeory Stick), generally only used in SONY's models, rarely seen in other products. <br> ★ Sampling rate <br> Most of the mp3/mp4 support 44.1kHz, very few parts of mp3/mp4 Walkman support 48kHz MP3/mp4 .file. <br> ★ Bitrate <br> Also referred to as bit rate, mp3/mp4 file can use the generic is 8 ~ 320kbps, but different <br> Mp3/mp4 Player <br> In this regard is not the same as .the supported range, most 32-256Kbps, this index is, of course, the more the better, but it is the highest grade 320Kbps. <br> <br> ★ VBR <br> Dynamic code, now out of mp3/mp4 Player .most support VBR, however some machines while the ability to play the VBR format song, but cannot correctly display the play time, many high-quality mp3/mp4 with VBR encoding, so pay attention to when choosing mp3/mp4 Walkman support for VBR is .valid. <br> ★ WMA <br> WMA is a Microsoft-developed a digital audio format, it can be in the same sound quality than mp3/mp4 format files smaller, so has this feature in disguise increase mp3/mp4 Player. Its .compression rates generally 5 ~ 192kbps. Here it should be noted that the problem is that with Windows with WMP own compression, there is a copyright protection options that you want to remove, press out of mp3/WMA in mp4 to play on; there is .also general charges site download WMA files, which are encrypted, because different sites have different encryption algorithms, so far, yet a unified and easy method to crack. This point also need attention, compatible with WMA MP3/mp4 Walkman if not able to play .WMA songs, surely it is for this reason. <br> ★ Other file formats <br> This is more complex, such as ASF, WAV, in fact, from a practical perspective, the currently playing file also WMA mp3/mp4 and comparison ., the other or not popular, or volume is too big, not much practical significance, but there are small series is expected to support APE format MP3/mp4 Walkman came out well as soon as possible. <br> <br> <br> .★ FM <br> FM radio function. This is a mp3/mp4 with an additional feature. From a practical perspective, and now MP3/mp4 that is done is not very good, it should be said as a normal radio - receive range ., precision, and so on have a gap can only be described as a useful complement. Of course, if you pay attention to this feature, also have a good product. But overall, it is recommended that you only as a buy mp3/mp4 .in one reference - really want to listen to the radio, spend tens of separate buy a front said ordinary radio, spend more money than it is for this feature to pay increase. And in particular models, for FM, different products have broken down .: If you can save the selected channel, you can save the number of channels, stereo and Mono can set or set by machines. <br> ★ Recording function <br> Divided into registered and recorded in the outside. External recording, direct external .sound recording voice, etc; in that recording FM function. Direct record, use the audio cable, CD, tape recording, etc. With direct record, the current situation is not ideal (means the demand for recording music), because either using ADPCM .format, sample rate is low in itself, or even use mp3/mp4, WMA formatsRecording, but since the encoding operation capability or not, so the results are not good. Therefore, we recommend that unless the record does not focus on English teaching material ., the sound quality of the content, not be disappointed. But in effect recording accuracy, similarly like FM function, different models and refinement options: whether to adjust the audio sampling frequency, can the external MIC, audio file format (mp3/mp4, .ADPCM, WMA or other manufacturers custom format), audio file to upload and play (on the need to save audio files and edit users, this is significant). <br> ★ Repetition function <br> From the current mp3/mp4 products, .basic should have features: single loop, a lot of song cycle, fast forward, rewind, AB repetition (arbitrary points repetition). There are also some advanced features, now have the product in that it adds new features: such as voice speed ( .some models can be 50% -200% for adjusted), by setting the number of seconds to read, audio text synchronization. This function also note that different machine when there is a time delay AB, for example you set A point, really repetition .will find actual not you press A key point with delay. This is the focus on the functionality users need in the selection. <br> <br> <br> ★ Mobile storage <br> Into no-and flooding-two. Most of .the mp3/mp4 Player for copyright protection, requires the use of management program for mp3/mp4 Player and computer room of file upload and download. Now out of mp3/mp4 generally non-music format files support for file management, that is, you .can implement these file upload and download. But if you need to install the driver, affects only a specific application environment - if it is fixed on the computer, even if a drive also does not matter; if it is often in a different computer .to transfer files between, of course recommend wuquxing, after all, eliminates the Setup Manager. (There's no drive is operating relative WIN98) <br> ¡ .Ï battery <br> Into the use of ordinary batteries (AA means 5, batteries, AAA means 7, battery) and dedicated battery. Recommend the use of ordinary battery products, because the use of ordinary batteries products you can purchase through its own rechargeable .battery for the latter of the results; and using a dedicated battery, prone to battery is broken after the special battery troubles. Of course, there is a dedicated battery, you can implement the body shape of thinner. And it-related, of course ., is the longer playback time - the better, it goes without saying. Here are two points to note: first manufacturers nominal play time is the specific operating environment, temperature, volume, backlight is turned on, battery capacity, etc., some .consumers feel that their own camera and not achieve nominal time, this is the actual use of the environment and the different nominal environment; secondly it is in this indicator, the large relative stricter, generally nominal environment using time to achieve nominal value, the small .factory of water relatively large. <br> ★ Interface <br> Early in General is now essential for the parallel port is USB interface. The advantage is the transfer rate is fast and supports hot-plug. Note the USB specification 1.1 and 2.0. .Common or 1.1, 2.0 rarely see. There are also some special use 1394 interface. With mp3/mp4-capacity increase, in this context will have more concern because faster, in the capacity of the machine to reflect its benefits. <br> ★ .Color LCD monitor <br> Including whether there is a backlight, and backlight colors, patterns (EL or other type, etc.). At present, with EL backlight, in light of the factors when the boost because, background noise, so find .your mp3/mp4 sometimes how noisy is going to look at whether or not affected by this impact. <br> ★ Support language <br> The screen shows the type of language. English is affirmed, the domestic users of course want to support Chinese .. One should note that most of the mp3/mp4 can only realize the song name display Chinese, but the menu is in English. <br> ★ Support ID3 <br> ID3 is a music file name, author of songs can display (not .a filename). <br> <br> Built-in Flash memory <br> Mp3/mp4 's most value are mp3/mp4' s size. From the early 16M, 32M to 64M, 128M, 256M, and has appeared in .512M. In General, 128Kbps compression MP3/mp4 each song about 3-5M, so now the mainstream 128M memory can hold such songs about 30 first. 2003 128M capacity already became the mainstream standard, by the end of 2004 are likely to reach this .target 256M. <br> Expanded memory <br> The equivalent of your own to add capacity to the computer. The difference is the increase of Flash based mp3/mp4, you can have a CF card, SM card, multimedia card, SD card .etc. CF card is the early mp3/mp4, now because of the volume and power consumption, is rarely used; SM card should be considered at present mp3/mp4 with most of the expansion card, MMC card in the case of the second generation .of the expansion card, use it more; SD card is in the MMC card developed on the basis, so it is also backward compatible - that is if your mp3/mp4 support SD card, so it can also support the MMC card, MMC .card slot, mp3/MP4 SD card is not supported. In addition to the above cited several cards, SONY is dedicated to the memory stick (Memeory Stick), generally only used in SONY's models, rarely seen in other products. <br> Sampling .rate <br> Most of the mp3/mp4 support 44.1kHz, very few parts of mp3/mp4 Walkman support 48kHz MP3/mp4 file. <br> BitRate <br> Also referred to as bit rate, mp3/mp4 file can use the .generic is 8 ~ 320kbps, but different mp3/mp4 player in this regard the supported range, most 32-256Kbps, this index is, of course, the more the better, but it is the highest grade 320Kbps. <br>.