S1 MP3 player
|This article may need to be rewritten entirely to comply with Wikipedia's quality standards. (March 2011)|
|S1 MP3 Player|
A typical S1 MP3 player.
|Manufacturer:||This product is what is referred to as a 'common mold' which means many different suppliers can produce this same model. The manufacturers are almost exclusively located in China.|
|Type:||Portable MP3/WMA Player|
|Range:||64 MB to 4 GB|
|CPU:||Z80 compatible + 24-bit DSP|
|Screen:||128 x 32 pixel|
|Frequency Response:||20 Hz to 20 kHz|
|Power||AAA battery/Rechargeable battery on some models|
S1 MP3 players are a type of digital audio players based on many different kinds of chipsets. The popular ones include Actions and ALI chipsets. They are sold under dozens of different other brand names and in a variety of case designs.
- MP1, MP2, MP3 and WMA playback
- WMA DRM support on a small number of models
- Ogg Vorbis support on a small number of models (mostly models made after 2005)
- USB Mass Storage device – works with Windows XP, Linux and Mac OS X, acts as USB key drive
- Memory capacities of 64 MB to 32 GB. 4–32 GB versions usually have a smaller Flash memory chip hacked to appear four times higher in capacity than it really is.
Specifications (Note that the below information varies by chipset version and manufacturer) 
- 24-bit DSP with on-chip DSU[disambiguation needed]
- 8-bit Z80 CPU core with on-chip DSU (runs at 24.576 MHz(TYP), up to 60 MHz — software controlled)
- USB 2.0 Full speed (not Hi-Speed), with transfer rates up to 8 Mbit/s, or 1 MB/s
- Works as a generic USB storage disk (USB Mass Storage)
- Supports MPEG1/2/2.5 Audio Layer 1, 2, 3 (MP3) and WMA. Ogg Vorbis also supported since at least 2006, though this is not typically listed on the player's packaging.
- Frequency response: 20 Hz to 20 kHz
- Earphone impedance 32 Ω (wasn't tested yet)
- Output power: 5 mW × 5 mW (16 Ω) (wasn't tested yet)
- S/N (signal to noise ratio) around 70 dB [quoted as up to 85 dB by some vendors, known to be noisier at low volumes]
- FM radio (depends on the presence of the Philips TEA5756 radio chip; this chip can handle the FM frequencies of both the US and Japanese commercial FM bands).
- Graphic equalizer presets
- Record from built-in microphone or FM radio in ADPCM WAV (32 kbit/s mono or 64k bps stereo; using FFmpeg codec named adpcm_ima_wav), ACT (8 kbit/s) or VOR (32 or 8 kbit/s) formats, and ability to play back these files locally or via Windows Media Player when connected as MSC device.
- Basic telephone number list viewer
- ID3 tag display
- Supports most operating systems that have USB Mass Storage support.
- Firmware upgrade tool for Windows.
- Logo customization via Chinese-language software or firmware hacks.
- Built using Hynix or Samsung solid-state NAND flash memory.
- Philips TEA5756 low-power FM tuner chip.
- ATJ2085 as the processor, RAM and the ROM.
- Some newer players have a slot for SD/MMC cards of capacities from 32 MB to 4 GB.
- Atak M971, M972
- Orient HN500
- Orient MP08, MP09
- DIGIQuest DMTF17
- InnoAX iMX-120
- Orb A3188
- Power Up!
- Sumvision M18 (256MB/512MG/1GB/2GB/4GB models in different colors)
- Stone White / Stone Black (1gb/2gb) Produced by Compark
- Tamashi KXB256 / KXB512 / KXB1024
- Mach Trio 2 GB
- Z6 Zeutronics (Digital M3/MP4 Player)
- JFF Nano (Digital MP3/4 Player)
- Mithus (Digital MP3 Player)
- NEO Electronics (Bulgaria)
- ePro (Digital MP3 Player)
- LASER (badged as generic, no model name)
- TEVION 1GB Sports MP3 player - (Smart Group) Identifies as "Productor Wilson Co. Ltd." - Version 3.5.35. (Supports Ogg Vorbis)
- TEVION 1GB/2GB MP4 player - (fascin8) - Firmware Version 9.1.51.0005
- INOVIX IMP-97 (and other models)
- Orite EMP-735
- LG UP3#
- Zepo m15-1GB-SB0307 (sold on e-bay)
- Explay c300
- DSE MP3/WMA Players (A5384: 2GB version)
- Lark Smile
- MpMan MP-F62, MP-F63
- Nextar MA99T
- Hip Street 2GB
- Visual Land V-BOP VL807] series (supports Ogg Vorbis)
- Denver Electronics (Denmark)
- Sqmy, Soni (fake Sony)
- Daewoo International MP3 Players
- Mustek (Taiwan)
- Element Electronics
- Technisat MP3-Player 256MB
- Foehn & Hirsch MA588
Battery life 
Others have a rechargeable battery which charges via USB host connection.
Many turn off automatically when idle for even 30 seconds.
Note also that charge duration varies widely between playback and recording modes.
Software utilities 
Available utilities for Microsoft Windows include an ACT to WAV file converter (for files recorded on the device), a basic desktop editor to enter contact details for the device's phone book function and device drivers for Windows 98. An 8 cm CD-ROM containing some or all of these is included with some versions of the device.
Firmware update issues 
The firmware used in various S1 MP3 players differs significantly, but this is not widely understood. Problems have arisen as consumers have attempted to upgrade their players using incompatible firmware with a higher version number. This can damage the players almost permanently. However, a 'dead' player can sometimes be recovered by opening it, shorting some pins and uploading a full firmware from the PC.
||This article needs additional citations for verification. (July 2009)|