At the Bluetooth Congress in Amsterdam, STMicroelectronics has demonstrated a real time streaming MP3 Bluetooth wireless headset. The headset receives a streaming MP3 audio from a remote Bluetooth-enabled PDA, decodes it and plays it in real time. The headset is also paired with a Bluetooth enabled GSM mobile phone. When an incoming call is received on the GSM phone, a signal is generated in the headset; the streaming MP3 audio is then interrupted to allow the call to take place, but resumes as soon as the call is completed.
This demonstration highlights STs strength in the convergence of wireless communication and digital consumer technologies, said Marie-Helene Sibille, General Manager of STs Wireless Terminals Division. Having a broad range of IP and know-how from both wireless terminals and multimedia applications positions ST to benefit from the next generation multimedia-enabled convergence products.
The Bluetooth cordless headset is built around ICs from STMicroelectronics and software from Ericsson and Widcomm. The Bluetooth devices in the headset are the radio front-end Rainbow STw5288 and the digital baseband BlueSilk STw2410 from ST. The Bluetooth digital core in the STw2410 is licensed from Ericsson Licensing Technology. The headset also includes the STA015 MP3 decoder and the stereo STw5094 codec, both from ST. The software host stack is embedded on the STw2410 and has been developed in co-operation with Widcomm, including an Alpha release of the Audio/Video Profile. ST plans also to support other formats such as MP3Pro, AAC and SBC.
The Rainbow radio front-end used in the demonstration has received Bluetooth certification from the Bluetooth qualification authorities. It combines low IF architecture and high level of integration, which enables an implementation with a minimum number of external components. In addition, the use of STs proprietary BiCMOS6 silicon germanium (SiGe) process results in a cost-effective and compact design with very low power consumption and low BERs. Its features make it particularly suitable for battery-powered devices, such as cellular phones or PDAs.