Áp dụng DSP lập trình trong truyền thông di động P11 ppsx
Áp dụng DSP lập trình trong truyền thông di động P11 ppsx
... degradation.
Recently standardized, MPEG-4 audio supports a wider range of data rates, from high-
quality coding at 64–392 kbps all the way down to 2 kbps for speech. MPEG-4 audio is
Video and Audio Coding for Mobile ... into the audio encoder typically consists of digitally-sampled audio, which has
been segmented into blocks, or frames, of audio samples. To smooth transitions between
Video a...
Áp dụng DSP lập trình trong truyền thông di động P3 ppsx
... to the DSP through a standardized interface. Therefore
TCCs benefit from the DSP addressing capability, DSP address/data bus bandwidth, internal
registers and common DSP memory space. Additionally ... Channel
CDMA Code Division Multiple Access
DBB Digital Base Band
DLL Delay Locked Loop
DSP Digital Signal Processor
ETSI European Telecommunications Standards Institute
FDD Frequency Di...
Áp dụng DSP lập trình trong truyền thông di động P1 ppt
... focusing on signal processing DSP designers have put
programmable DSPs at the heart of many consumer devices, including mobile communica-
tion systems. Recently DSPs have been specialized to ... past and in the future. We highlight different perspectives,
especially regarding implementation issues, in the processing of speech, audio, video, future
multimedia and location-based services as ....
Áp dụng DSP lập trình trong truyền thông di động P2 pdf
... power
consumption of the DSP. In addition, parallelism can be used to increase the number of
The Application of Programmable DSPs in Mobile Communications18
Figure 2.5 Power dissipation trends in DSP
1976, ... in GSM, in ’Applications of Digital Signal Processing’,
Proceedings of DSP9 4 UK, 1994, and in Technologist Proceedings, Herzlya, Israel, November 1995.
The History of DSP Based A...
Áp dụng DSP lập trình trong truyền thông di động P4 pdf
... they are closely related.
The most DSP intensive functions are the two types of channel decoding: convolutional
decoding and turbo decoding. Convolutional encoding is used for low data rate frames ... with a DSP was also achieved by memory mapping the device, by
allowing block data transfers for input and/or output to be simultaneous with decoding, and
by providing various signal lines fo...
Áp dụng DSP lập trình trong truyền thông di động P5 pptx
... Application of Programmable DSPs in Mobile Communications78
direct path (path 0) so that
t
k
is the differential multipath delay between the reflected path and
the direct path. (This forces
t
0
¼ ... and
flexibility to make hosting them in ASICs difficult. They are ideal however for a sufficiently
powerful DSP. With the growing popularity and flexibility of software radios, DSPs will
continue to...
Áp dụng DSP lập trình trong truyền thông di động P6 pptx
... the digital
domain.
6.3 Digitizing Today’s Analog Operations
Digitizing operations currently performed in analog requires moving the Analog to Digital
Converter (ADC) ever closer to the radio’s ... transceivers for different modes (RF bands). This ‘‘ velcro radio’’ leads to
problems with handset size and cost. On the other hand, digital-based multimode compo-
nents face the challenge of provi...
Áp dụng DSP lập trình trong truyền thông di động P7 potx
... real-time DSP in an application, the implemen-
tation of a DSP solution involves the use of many ingredients: analog to digital converters,
digital to analog converters, ASIC, memories, DSPs, microcontrollers, ... therefore centered more on ‘‘ disguising a RISC processor as a
DSP ’ or using small DSP coprocessors. In the case of the latter, the excess burden of the DSP
Enabling Multi...
Áp dụng DSP lập trình trong truyền thông di động P8 ppt
... part our ongoing work
carried out around a distributed Jvm
1
in the context of multimedia applications. This distrib-
uted Jvm first permits the use of a DSP to a Java application and second exploits ... permit the use of
the DSP as another processor to execute Java code and secondly to exploit the DSP low
The Application of Programmable DSPs in Mobile Communications132
Figure 8.1 Distri...
Áp dụng DSP lập trình trong truyền thông di động P9 pot
... applications.
Improved coding efficiency can be obtained by coding the difference between consecutive
samples, using a method called differential PCM (DPCM). In predictive coding, the differ-
ence that ... of immediately preceding samples:
~
sðnÞ¼
X
p
k¼1
aðkÞ sðn 2 kÞ;
where
~
sðnÞ is the predicted value of s(n), a(k), 1 # k # p are the predictor coefficients, and p is
the order of the predict...