- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄360859 > IMXHANTROWP i.MX Applications Processors with Hantro＇s Multimedia Framework PDF資料下載
參數(shù)資料
| 型號： | IMXHANTROWP |
| 英文描述： | i.MX Applications Processors with Hantro＇s Multimedia Framework |
| 中文描述： | i.MX應(yīng)用處理器與Hantro的多媒體框架 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 653K |
| 代理商： | IMXHANTROWP |
i.MX Application Processors with Hantro’s Multimedia Framework White Paper, Rev. 2
4
Freescale Semiconductor
In addition, there is an inherent advantage to implementing the Hantro MPEG-4 and H.263 codec with Freescale
technology in hardware since it requires far less power to operate than a software only solution. Simply put, it is
designed to take less power to trip a gate than it does to run software. Still, the options are not simply all software
or all hardware. The Hantro video codec may be implemented as a combination of hardware and software,
depending upon applications processor priorities.
Two Freescale test case analyses, one with a video phone and the other with one-way streaming, demonstrate the
flexibility of the i.MX21/Hantro solution, and how a hardware implementation can help reduce the amount of
processing power needed for multimedia functions.
A Power Saving Demonstration
In the videophone use case scenario (QCIF, 15 fps), a live, real-time video and audio link is established between a
wireless handheld and another device. The applications processor had to support the following applications,
running in parallel: MPEG-4 encode; MPEG-4 decode; MPEG-4 post-processing, including deblock, dering,
resizing, and color space conversion; image pre-processing and camera view finding; AMR (adaptive multi-rate)
voice encode; AMR voice decode; echo cancellation, and operating system overhead, using operating systems such
as Symbian OS, Palm OS, WinCE or eLinux. All megahertz numbers are approximate and are based on simulated
performance analyses.
To run all these functions using only the ARM926EJ-S core unit would require well in excess of 400 MHz. In this
case, MPEG-4 encoding alone would require about 190 MHz. Employing low-level assembly optimized MPEG-4
encode and decode, plus eMMA pre-processing and post-processing hardware acceleration, helps to reduce cycle
usage to approximately 250 MHz.
By implementing encode and decode in hardware, as well as the Freescale post-processing technology,
performance requirements plummet to about 160 MHz.
The one-way streaming use case scenario involves streaming CIF resolution 30 fps MPEG-4 encoded data from
external memory/flash memory (or across a wireless link through an MPEG-4 decoder) to a display. The
applications processor is required to support: MPEG-4 Decode; MPEG post-processing, including deblock, dering,
scaling, and color space conversion; audio decoder (MP3 or AMR); and OS overhead.
For the ARM926EJ-S alone, using optimized MPEG-4 decode software, meeting these requirements would require
about 610 MHz. MPEG-4 decoding alone would take 140 MHz (much more than for the video phone because of
the higher resolution and greater frame rate requirements). By implementing the Freescale post-processing
technology in hardware, the performance requirement drops to about 210 MHz. Furthermore, employing Hantro's
hardware decoder rather than the optimized decode software-only solution gets you down to less than 100 MHz.
The Modular Solution
Each block that makes up the eMMA—video encoder, video decoder, post-processing and pre-processing
technology—is an independent component that may be implemented in hardware or software, regardless of how
the other blocks are employed.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IMXPWSWP_D | i.MX Application Processor Creating Power with Stamina White Paper White Paper |
| IMZ1 | TRANSISTOR | BJT | PAIR | COMPLEMENTARY | 40V V(BR)CEO | 100MA I(C) | SO |
| IMZ2 | TRANSISTOR | BJT | PAIR | COMPLEMENTARY | 40V V(BR)CEO | 100MA I(C) | SO |
| IMZ3A | TRANSISTOR | BJT | PAIR | COMPLEMENTARY | 100MA I(C) | SO |
| IMZ3 | TRANSISTOR | BJT | PAIR | COMPLEMENTARY | 50V V(BR)CEO | 100MA I(C) | SO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IMXLRM1AL | 制造商:Hubbell Wiring Device-Kellems 功能描述:ISTATION MODULE, W/MINI XLR,1U,AL |
| IMXLRM1BK | 制造商:Hubbell Wiring Device-Kellems 功能描述:ISTATION MODULE, W/MINI XLR,1U,BK |
| IMXLRM1EI | 制造商:Hubbell Wiring Device-Kellems 功能描述:ISTATION MODULE, W/MINI XLR,1U,EI |
| IMXLRM1GY | 制造商:Hubbell Wiring Device-Kellems 功能描述:ISTATION MODULE, W/MINI XLR,1U,GY |
| IMXLRM1LA | 制造商:Hubbell Wiring Device-Kellems 功能描述:ISTATION MODULE, W/MINI XLR,1U,LA |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。