20 left fund hydraulics parts that MP3 chooses decodes the chip
20 left fund hydraulics parts that MP3 chooses decodes the chip
Though chip can determine quality of MP3 totally already now, value and worth. But if has not any understood MP3 chip Hydraulic motors when choosing MP3, very easy to be got by under false pretences by the distributor. So, do not demand to master the chip function while choosing MP3, but will know some sort of.
Nowadays, Philip, Sigmatel, Telechips,etc. are still the decoding scheme of the mainstream, but the performance of the chip has been promoted much. And manufacturers such as Samsung,etc. have put out one’s own high performance and decoded the system.
First, Philip’s series
Producing area: Holland
If must choose at present the best MP3 decodes the chip on the market, it is so undoubtedly a chip of Philip. Philip decoding chip of family” with complete function, tone quality kind with it in industry, the price is high “ And remarkable.
Decoding whom chip adopt generally of Philip encapsulate craft BGA, and domestic respect this technology quite limited, in addition, because the decoding chip of Philip needs to match other control chip circuit to work in coordination, so the cost of goods is relatively high. So adopt the manufacturers that Philip decodes the chips to often all orientate as China’s high price, such as MPIO and IRIVER two South Korea MP3 professional manufacturer these. These two brands and a main common characteristic are that adopt the decoding chip of Philip in the products in an all-round way. So, their products have very high tone quality and quality, become the target who global MP3 fans chase.
1,Philip SAA775X series (SAA7750/7751/7752/7753)
Philip Hydraulic pumps SAA775x chip market MP3 player decode chip group function most complete at present ‘ Support CD to record directly) ,One of the best decoding chips of result. The tone quality that it’s time to decode the chip is shown as: Bass sinks than deep, middle pitch does well, but the high pitch seems more general by contrast.
Because include DSP (Digital Signal Processing, the digital signal deals with) in SAA775x inside With 32 ARM RISC processor, so can use the single chip of the integrated level of the superelevation, jobs such as audio frequency decoding and pronunciation code,etc., and can join SDMI (Secure Digital Music Initiative, the digital music of the safe type) Protection.
Among them include DSP and 32 ARM RISC processor in SAA7750, SNR is 90dB. This chip compatible many sections of many shelf intellectual sound result, EQ of location, support, keep with ADPCM form pronunciation record, reveal song name and song message, Line-in frank record in step, in addition support USB1.1/2.0 standard, support the multiple music form to decode. And SAA7751 is only DSP kernels and flashing memory, does not include the multimedia of audio frequency to solve the encoder, can only used in itself MP3 CD CD that upgrade at the player. SAA7752 is a solution directed against the price, only include DPS chip, use the external memory to store the data, directed primarily to CD walkman. Unless SAA7753, too it have DSP chip only,it and change completely even more,the clear-cut to last flashing memory with memories embedded directly, CD which corresponds to the low price broadcasts the system, as a function of adding MP3.
The embedded processor which Philip SAA775x adopted, have advanced energy functions of management, can control the running speed of the processor according to the needs of task amount, in order to lengthen the service time of the battery, similar to generally enabling and used in advanced PDA and power-saving technology of the notebook computer. So, when SAA775x chip broadcasts 128Kbps MP3 with ordinary volume, the single power supply time of AA battery can be as long as 24 hours. Certainly this is the theory working time of a chip, to MP3 player, because of the restriction of the production technology, concrete working time on another cup of tea.
2,Philip Nexperia PNX010x series (PNX0101/0102/0105)
It is a piece of great series too that PNX010x series decode the chip, including PNX0101, PNX0102 and PNX0105. Among them PNX0102 and PNX0102 develop for flashing memory MP3 walkman specially, but PNX0105 directs against the products of the hard disk type multimedia player.
PNX0101 embeded with 4Mbit can programme FLASH, only supports USB1.1. All adopt USB2.0 interface that PNX0101 chip MP3 allocate at present, all realize by increasing USB2.0 in addition and controlling the chip. (Note: Can support USB2.0, SD/MMC to expand etc. to use with the cooperation of Molex) PNX0102 inlay programmable FLASH to have 8Mbit, oneself offered the support to USB2.0. PNX0105 supports USB2.0 too, and support Japan construction machineries parts GDMA and IDE (ATA/ATAPI/PC Card) When the interface, but it puts programmable FLASH in not having
