function
MP3 has more and more functions. Like PDA and mobile phone, it is developing to multi-function, absorbing the functions of other products as much as possible to increase the selling point of products. When buying, you should start on demand and don't blindly pursue versatility. The more functions, the more expensive they are, and when you buy them back, you will find that many of them are not used at all.
● Mobile hard disk: The computer directly recognizes MP3 as mobile storage, which can store all kinds of files except music.
● Firmware upgrade: Solve the known software and hardware faults after product release and add new functions.
● Folder browsing: Different songs are stored in folders and played as a unit, so it is not necessary to put all MP3s in the same directory, which improves the ease of management.
● Multilingualism: Chinese Simplified, Chinese Traditional, Korean, Japanese and English are mainly supported, and some models even have 26 languages.
●A-B Repetition: Reading a passage repeatedly is convenient for learning a foreign language.
● Text reading: Usually only large-screen MP3 players have this function, which can be read as an e-book. Some products also support the text format of PDA. If the firmware capacity is sufficient, you can also download various Chinese and foreign fonts. Auto-scrolling is also useful. When turning pages automatically or automatically, the background light is always on, which not only saves the trouble of turning pages by yourself, but also completely makes up for the shortcomings of small display screen. You can even listen to MP3 while reading, just like a PDA with simplified functions.
●TTS(text-to-speech), which directly converts text into text through MP3. The machine sound has no change in tone and rhythm, which sounds strange, but it is very suitable for lazy people who don't want to read.
Dictionary: an English-Chinese dictionary for translation. Note that MP3 control keys are limited, and it is not easy to input English words.
● Automatic recording function: With SAD (Sound Activity Detector), you can set the mute duration and record only when there is sound, which saves both storage space and playback time.
● Remote recording: AGC (Automatic Gain Control) can be used to adjust the sensitivity and recording quality (low, heavy and high), which is suitable for long-distance external recording, such as meetings.
●FM: Listening to the radio, many products can preset several channels without having to tune them every time.
●FM recording: Transfer the radio content to MP3, and some products also have FM recording! You can enter which day of the week, when and how many hertz of channels to start recording. You won't miss it because you are busy with your favorite radio programs or foreign language learning programs. You can record it and listen slowly.
●EQ setting: setting of sound effects. Almost every product has several preset sound effects settings, such as normal, rock, jazz, pop and classical. Some MP3 players also support custom sound settings, which users can customize according to their own preferences. For products without LCD display, these EQ settings almost don't exist, only curing their own sound mode. This is a bit cruel to some friends who are particularly loyal to personalized music effects.
● Direct recording: encode and compress external audio sources (CD/MD walkman, home stereo, computer) into music files and store them directly on MP3. Due to the poor performance of the built-in coding chip of MP3 player, the sound quality is not as good as that of the music files compressed by computer.
● Clock: The time setting can be entered as month, day and hour, which can be used as a watch.
● Alarm clock: A timed alarm clock can be set, which can not only beep when earplugs are installed, but also beep when microphones are installed. The alarm clock will also take effect when earplugs are not installed.
● Timing shutdown: The timing shutdown time can be set between 0 ~ 180 minutes. Of course, you can also set the automatic shutdown without operation for 0 ~ 60 minutes, which is most convenient for listening to songs before going to bed at night.
● Picture Browser: You can not only browse the photos you have taken, but also enjoy the pictures downloaded from the computer. Because the screen of MP3 is small and the resolution is relatively high, you will feel beautiful when you look at the picture, but most screens are limited in proportion. If the scale is wrong, it will be deformed and cannot be displayed normally.
● Digital camera: Like the early cameras of mobile phones,10-300,000 pixels1/5.5 "CMOS lens is adopted. The main disadvantage of CMOS is its slow brightness sensing, so the shooting effect is better in a well-lit environment. The biggest advantage of CMOS is its small size, which is most suitable for MP3 walkman. The camera itself also has many functions, such as digital zoom and multi-effect shooting.
battery
Early MP3 players used No.5 (AA) or No.7 (AAA) batteries, so you can buy them at will, and the price is relatively cheap (0.5-5 yuan). If it is a rechargeable lithium battery (10- 15 yuan), the battery life is long, and the playing time can reach more than 10 hour. Carrying extra batteries can meet the demand for 2-3 days. You can't always plug your ears with headphones.
What is important here is the lithium battery, which can be divided into two types: detachable and non-detachable. The detachable lithium battery is very convenient to use and can be replaced at any time. In addition to charging after connecting the computer with USB cable, you can also charge with the attached power adapter. Its large capacity and special discharge mode can guarantee the playing time of more than 30 hours, which is enough for three AA batteries. However, there are few MP3 players using detachable lithium batteries, and they will not exceed the model of 10 on the market. The nameplate on the battery will indicate the battery working voltage, safety matters, warranty period and other information, as well as the maximum output current and charging time, so as to facilitate re-purchase. But buying a detachable lithium battery is also quite expensive (150-around 200 yuan). Because of its small size, it will be very painful if you accidentally lose it.
In contrast, non-removable lithium batteries have no loss problem. MP3 players using this battery are usually quite small, and even the LCD screens of power-saving homes are not available. But they can still play for 6-8 hours. Its biggest problem is that it often needs to be recharged. If you use it for a long time, you have to carry a charger with you, which is really troublesome. If you have all kinds of digital products, the weight of the charger alone is enough for you. In addition, pay attention to its service life. Many people don't cherish the use of lithium batteries. Don't run out of lithium batteries every time or use low power. Many people have this misunderstanding. In fact, lithium batteries should maintain 40% to 60% capacity, of course, they can still be fully charged. Lithium batteries need to be charged as needed, and each time they are used up, they will be filled with the "patents" belonging to the early Ni-MH batteries. Lithium batteries only need to be charged once a month (less than 20% is used or the equipment is automatically turned off). The omen is that the use time is getting shorter and shorter until it can't be recharged at last. Once the non-removable lithium battery is damaged, it can only be repaired and replaced by the manufacturer in the early stage. Usually only manufacturers have this special battery with unique shape, and the replacement price is about 100 yuan/block. After the product has passed the warranty period, the maintenance fee will be paid, and the long-term investment will be doubled. But now all you have to do is go to a shopping website like Taobao and buy a battery. Non-original batteries are often cheaper or even larger than original batteries. It's normal to replace the battery by yourself. All you have to do is find a disassembly tutorial.