Cordless phone + VoIP
Web-enabled technology and an advanced ARM7/DSP architecture let consumers use a cordless phone, rather than a computer, to make inexpensive domestic and international calls using the Internet.
Key features
High-end ARM7/DSP baseband with VoIP protocol stack
Up to 836 kB on-chip Flash
Flexible BMP and multiple audio codecs
Support for advanced VoIP capabilities
New service for messaging, chat, MMS, etc.
Downloadable for tones, wallpaper, etc.
Remotely upgradeable
Conferencing
Keeps emergency PSTN line
Complete SIP RTP stack
Essential IP embedded in firmware for small footprint
Voice codecs G723.1, 729, 726, 711
Supports STUN (Simple Transversal of UDB through NAT)
Supports SIP ID and the E.164 numbering plan
Advanced cordless phone functionality
Polyphonic ringing, handsfree (full duplex), voice recognition, echo suppression, distortion free
Full compatibility with DECT, US-DECT, WDCT, Bluetooth, Wi-Fi
Background information
Adding a VoIP stack to the baseband means that a cordless phone can use the Internet to place domestic and international calls. This provides a significant cost savings for consumers, since calls are a fraction of normal prices or even free. Migrating a cordless phone to the IP format also enables other desirable features, such as browsing, instant messaging, and even gaming. Consumers can also use VoIP-enabled handsets to download new ringtones or color images for their phone’s display.
The baseband PCD8072x uses a high-end ARM7 and DSP technology. The baseband runs a complete VoIP stack and efficiently integrates the codecs as part of the firmware. The VoIP functionality builds on the familiar cordless architecture, so it’s easy for digital cordless manufacturers to construct a complete VoIP system. The architecture has also been optimized for very low power consumption, so the basebands deliver extended talk and standby times.
The baseband’s processors are supported by program memories, interface circuits, two audio codecs, auxiliary A/D and D/A converters, a baseband RF modem, and data Flash memory for speech storage.
The baseband architecture includes up to 896 kB of Flash memory, 36 kB RAM, and an external memory interface for enhanced applications that require access to more memory. There is an optimized, six-line interface to the radio chipset and there are multiple interface, including GPIO, SPI, I2C, and UART, for peripheral connection.
The baseband’s software stack in this system includes unique STUN support to over come NAT and firewall constraints when placing VoIP calls. The stack also supports the SIP ID and the E.164 numbering plan.
An integrated programmable Burst Mode Processor (BMP) in the baseband supports easy differentiation and is fully tested for compatibility with DECT, US-DECT, WDCT, Bluetooth, and Wi-Fi. On-chip firmware includes DTAM, VR, SMS, codecs, and more. Each baseband is interchangeable for DECT and WDCT, so a single platform can be used worldwide. Also, since each baseband is based on the same Application Programming Interface and hardware footprints, the basebands can be used for easy design-in over a range of phone models.
Other options in the PCD80(7)2x family support advanced digital-cordless designs for DECT and ISM 2.4 GHz. The basebands are supported by various DECT/WDCT transceivers. Transceivers for analog cordless are also available. |
|
