Dsp application on mobile communication
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DSP applications on mobile devices include reducing bandwidth for voice communications, implementing low power DSP, and enabling real-time multimedia. Voice communication bandwidth is reduced through speech compression down to 2,400 b/s using spectral analysis of speech segments. Low power DSP is achieved through devices like CADRE that minimize energy usage by reducing supply voltage, switched capacitance, and switching activity. Real-time multimedia requires synchronizing audio and video while accommodating high bandwidth video signals within network constraints through video signal compression.
Dsp application on mobile communication
- 1. DSP application on Mobile Communication Keval Patel 100110111007
- 2. Applications: • To reduce bandwidth in Voice communication • Low power implementation of DSP • In Real time multimedia facilities • To synchronice audio and video • To reduce the bandwidth of video signal
- 3. To reduce bandwidth in Voice communication: • As we know that if we increase the bitrate than we need more bandwidth. • But in celluler system our main aim is to reduce the required bandwidth. • For that we have to reduce the bit rate. To do that we may use DSP. • To reduce the bit-rate required for transmitting telephone quality speech, a new approach to speech compression is needed. • Current mobile phones compress to about 13,000 b/s (bit per second) and weaim to achieve 4,000 b/s and lower using a method called 'DAP-STC'.
- 4. To reduce bandwidth in Voice communication: • Compression is generallyachieved by spectrally analysing speech segments to derive a model of the human speech process. • A variable bit-rate version achieves an average 2,400 b/s and is suitable for packetised speech as may be transmitted over computer networks.
- 5. Low power implementation of DSP: • The requirement for extended battery life, reduced size and low electromagnetic interference for mobile communication equipment (i.e. our cellphone)has led to the development of a novel asynchronous DSP device known as CADRE. • The special features of CADRE is to minimize energy consumption. • This optimization at software level builds on the economies achieved at hardware design level and aims to minimize the switching activity when the DSP code is implemented.
- 6. Low power implementation of DSP:
- 7. Low power implementation of DSP: • This power consumption in CADRE can be achived by: 1. Reducing the Supply Voltage 2. Reducing Switched Capacitance 3. Reducing Switching Activity
- 8. Real time multimedia facilities: • Real time multimedia is one of the feature of high speed inter net. • The terminal would be any mobile PC or any desktop or other equipment. • The major problem in this type of video is to synchronice between video & audio information. • Distance learning can be a major application of fixed and mobile computer networks and the Internet. • Delay due to network problem have a more serious effects on real- time traffic than on text or only voice information.
- 9. Real time multimedia facilities: • One more thing to take in conceder in this is bandwidth. • As we know that the video require a higher bandwidth, so we have to accommodate video signals in given bandwidth. • This will again done by compressing the video signal as we discussed before in case of voice communication..
- 10. Real time multimedia facilities:
- 11. THANK YOU