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S1 MP3 Player

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S1 MP3 Player
A typical S1 MP3 player.
Manufacturer:	Many
Type:	Portable MP3/WMA Player
Connectivity:	USB 2.0/1.1
Range:	64 MB to 4 GB
CPU:	Z80 compatible + 24-bit DSP
Screen:	ID3 tag display
Answer:	20 Hz a 20 kHz
Power	AAA battery/Rechargeable battery on some models

S1 MP3 players are a type of Chinese-made digital audio player based on Actions chipsets. They are sold under dozens of different other brand names and in a variety of case designs. Versions that can play videos are often referred to as MP4 Players.

1 Capabilities
2 Models
3 Battery life
4 Software utilities
5 Firmware update issues
6 External links

Capabilities

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 4 GB. 4GB versions usually have a smaller Flash memory chip hacked to appear as 4GB.
MTV/ATV/AMV video support on some models

Specifications

24-bits DSP with on-chip DSU
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.
Frequency response: 20 Hz to 20 kHz
Earphone impedance 32 Ω [wasn't tested yet]
Output power: 5 mW x 5 mW (16 Ω) [wasn't tested yet]
S/N (signal to noise ratio) around 70 dB [quoted as up to 85dB 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 radio in ADPCM WAV (32 kbit/s), ACT (8 kbit/s) or VOR (32 or 8 kbit/s) formats, and play back these files
Basic telephone number list viewer
ID3 tag display

Software

Supports most operating systems that have USB Mass Storage support.
Firmware upgrade tool for Windows.
Logo customization via Chinese-language software or firmware hacks.

Hardware

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 capacites from 32MB to 4 GB.

Models

Orient HN500
Orient MP08, MP09
DIGIQuest DMTF17
InnoAX iMX-120
Orb A3188
Power Up! [1]
Sumvision M18 (256MB/512MG/1GB/2GB/4GB models in different colors)
Stone White / Stone Black (1gb/2gb) Produced by Compark [2]
SupportPlus
Tamashi KXB256 / KXB512 / KXB1024
Tamashi KSB256 / KSB512
Tamashi MKB256 / MKB512
Mach Trio 2 GB
Z6 Zeutronics (Digital M3/MP4 Player)
JFF Nano (Digital MP3/4 Player)
Mithus (Digital MP3 Player)
NEO
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)
INOVIX IMP-97 (and other models)
Orite EMP-735
Delstar
Nashi
LG UP3#
Zepo m15-1GB-SB0307 (sold on e-bay)
Explay c300
DSE MP#/WMA Players

There are also several models which carry no brand name or model number on the device or packing, and a few sold under counterfeit trademarks such as Sony or iPod.

Battery life

Around 8 hours on models using a AAA battery (Alkaline or NiMH).

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 permanently damage the players.