Chips for audio player:
The chips can be used for Mini speaker, Tour Guide Megaphone, Public broadcasting Amplifier, HIFI Amplifier, Car audio system, MP3 audio player and etc.
All of these kind of chipsets have these function:
These chips' design will reference some open source hardware program.
Support MP3, OGG, FLAC decoding by hardware.
Some of support AAC (include aac+) decoding by hardware
Support MP3 encoding by hardware.(When encoding 320kbps mp3,the encoding speed faster than realtime)
Support many kinds of EQ sound by hardware.
Support max to 72 polyphonys for MIDI fm synthesize by hardware.
Support JPEG, GIF, TIF (LZW), PNG, WebP image decoding by hardware.(When decoding JPEG image,the speed is very fast.)
Many of support low resolution Xvid video format decoding by hardware.(support AVI video container)
Support 24bit ture color OSD display (support transparent effect) by hardware.
Have a 32bit risc cpu (mcu) in the chip,compatible 8051 instruction Set.
Have a audio DAC & ADC in the chip,support 2 channel,max to 48khz 24bit per channel playback and acquisition.The signal to noise ratio are all higher than 90db. About the acquisition function,support one microphone input, 2 way two channel audio input(line in, aux in)
Support SPDIF in & out put port.
Have a USB 2.0 salve port. The Nand flash in the equipment,or the inserting SD/MMC card, can be used as a usb disk. Also can be used to brush firmware into the Nand flash.
The USB salve port also can be used as USB sound adapter,can be used for playback and acquisition.
If the equipment hava Bluetooth function, the USB salve port can be used as USB Bluetooth adapter
Have a USB 2.0 host port. Support usb flash disk,usb SDHC/MMC card reader, usb hard disk, usb cdrom.
Support FAT, FAT32, CDFS file system.
Support SD/MMC card.(support SDHC)
Support NAND flash, NOR flash, and some other kinds of flash memory chip
Have a BROM in the chip
Have one UART (Can connect Bluetooth chip)
Support four wire resistive touchscreen port
Support infrared remote control receiver.
Support some buttons.(include button lock.)
Real time clock function
Support power Management function
Can connect some kinds of sensor,such as: temperature, humidity, atmospheric pressure etc.
Support segment code display or dot matrix display, support LCD, LED, OLED screen, and support TFT/STN color LCD screen (CPU interface)
Can connect external video DAC chip,can support YCbCr,S-video,CVBS-video output (If the chip support color display)
Can support external audio power amplifier chip.
Can support external FM/AM/SW radio receive chip.
Can support external FM radio transmit chip.
Expand function (some of chips have function):
Some of support WMA decoding by hardware.
Some of support AAC or WMA encoding by hardware.
Some of support support Apple 30-pin dock connector, some of support Apple new 16 pin connector.
Some of chips for middle-grade and high-grade equipment,support AC3, DTS, DVD-audio, MLP, TureHD, DTS-HD, WMA-HD, SACD, DSD audio, and multi channel audio decoding by hardware
Another possible:
All of low-grade mini speaker, Tour Guide Megaphone, Public broadcasting Amplifier, low-grade Car audio system will not support audio files play function, so not support usb disk and SD card, and can't be used as a usb audio adapter,because these kinds of chips has been stopped to produce. But many of low-grade mini speaker, Public broadcasting Amplifier and Tour Guide Megaphone support FM & AM radio receiveing .All of mini speaker and Tour Guide Megaphone still will use USB (DC 5V) powersupply.
Public broadcasting Amplifier:
MP3 audio player (maybe will be stopped to produce):
Tour Guide Megaphone:
Mini speaker (maybe only support FM/AM radio and Sound amplification only,not support mp3 playing):
HIFI:
About Another possible,
maybe low-grade mini speaker only support FM/AM radio and Sound amplification only,not support mp3 playing:
没有评论:
发表评论