HIFI sound on what mean?
http://www.siliconray.com/sense-g5-tube-solidstate-hifi-headphone-amplifier.html
Hi-Fi is the abbreviation of English High-Fidelity, literal translation for "High Fidelity" is, by definition, : and the voice of the original highly similar to the replay of sound. So what kind of audio equipment the replay of voice is Hi-Fi? So far is still hard to make the exact conclusion. Audio industry professionals with each kind of instrument, by any measure, detection of all kinds of the index to determine the extent of the equipment Hi-Fi, and audio fancier then often through their ears to judge whether the equipment to mind the Hi-Fi. Heavy pitch discrimination lifted the degree of fidelity, not only need to have good performance of the equipment and software, and have good listening environment. Therefore, how to measure the acoustic equipment Hi-Fi degree, there are objective and subjective evaluation, the difference between the test.
Hi-Fi = high fidelity, hair ?
http://development-board.blogspot.com/
2012年2月6日星期一
Ask a arm problem, s3c2440 chip that nand flash on the controller in that there is a place to don't understand
Ask a arm problem, s3c2440 chip that nand flash on the controller in that there is a place to don't understand
http://www.siliconray.com/
Here the word access. Half word access and byte access is how certain, software configuration or chip fixed, thank you, because flash literacy has been make uncertain, hundreds of dollars to buy board put for a long time, no one understand around,
By software to set the access method. This way you choose depends on the FLASH visit structure, and if your FLASH support 32 bit visit, it is 3 kinds of methods, if your FLASH is 16, then after only two, if your FLASH is eight, it can only visit BYTE. Generally speaking, if FLASH is not very big, with BYTE ACCESS. Come from: turn the answer
http://www.siliconray.com/
Here the word access. Half word access and byte access is how certain, software configuration or chip fixed, thank you, because flash literacy has been make uncertain, hundreds of dollars to buy board put for a long time, no one understand around,
By software to set the access method. This way you choose depends on the FLASH visit structure, and if your FLASH support 32 bit visit, it is 3 kinds of methods, if your FLASH is 16, then after only two, if your FLASH is eight, it can only visit BYTE. Generally speaking, if FLASH is not very big, with BYTE ACCESS. Come from: turn the answer
About S3C2440 simulator questions
About S3C2440 simulator questions
http://www.siliconray.com/development-boards/arm/s3c2440-arm-professional-kit.html
I have a friendly arms development board, but because the home computer can't answer, so hope begged programmer can recommend a simulator god of the horse.
I mean is that it can go toward inside to write programs, and the code of that kind of simulator, wood has a?????? I am a novice, just contact with these things, do not spray ~ thank you.
SDK cannot choose Windows Mobile, want to choose the Wince SDK, general as long as choose to the SDK, and in the corresponding simulator run successful, download to S3C2440 development board runtime no problem, but you must guarantee
http://www.siliconray.com/development-boards/arm/s3c2440-arm-professional-kit.html
I have a friendly arms development board, but because the home computer can't answer, so hope begged programmer can recommend a simulator god of the horse.
I mean is that it can go toward inside to write programs, and the code of that kind of simulator, wood has a?????? I am a novice, just contact with these things, do not spray ~ thank you.
SDK cannot choose Windows Mobile, want to choose the Wince SDK, general as long as choose to the SDK, and in the corresponding simulator run successful, download to S3C2440 development board runtime no problem, but you must guarantee
2012年2月2日星期四
Vehicle electronic compass work principle
Vehicle electronic compass work principle
http://www.siliconray.com/
GPS also called satellite positioning, GPS receiver to receive the can be used for GPS clock accurate to ns level time information; Used to forecast the next few months in the brief satellite location forecast star calendar; Used to calculate when positioning satellite coordinates of radio star for calendar, precision for a few meters to dozens of meters (each satellite is different, change); And GPS system information, such as satellite condition and so on.
GPS receiver to yards of measurement can get satellite receiver to distance, because it contains the satellite receiver and atmospheric transmission error clock error
Poor, is called pseudorange. A code of 0 measured pseudorange called UA yards pseudorange, the accuracy of about 20 meters or so, to P yards of measured pseudorange called P yards pseudorange, the accuracy of about 2 meters.
http://www.siliconray.com/
GPS also called satellite positioning, GPS receiver to receive the can be used for GPS clock accurate to ns level time information; Used to forecast the next few months in the brief satellite location forecast star calendar; Used to calculate when positioning satellite coordinates of radio star for calendar, precision for a few meters to dozens of meters (each satellite is different, change); And GPS system information, such as satellite condition and so on.
GPS receiver to yards of measurement can get satellite receiver to distance, because it contains the satellite receiver and atmospheric transmission error clock error
Poor, is called pseudorange. A code of 0 measured pseudorange called UA yards pseudorange, the accuracy of about 20 meters or so, to P yards of measured pseudorange called P yards pseudorange, the accuracy of about 2 meters.
Electronic compass working principle and the overall plan
Electronic compass working principle and the overall plan
http://www.siliconray.com/3-axis-digital-compass-vms5883l-module.html
Z1 and Z4 for flip coil, Z2 Z3 and for compensation loop. Due to the environmental temperature may affect the system precision, therefore, in high precision system, can through the compensation of the coil compensation. There are two orthogonal inside of the magnetic field sensor? Corresponding to the planar X axis and Y axis. The principle of the magnetic field sensor is using magnetic resistance (MR) composition magnetic type structure, so that it can change the electromagnetic material in the external magnetic field in the electrical resistance coefficient. So in the magnetic field sensors to flip the coil Z1 and Z2 loading flip on electrical signal to change after the magnetic field. Because the changes caused by the magnetic field magnetic resistance changes (Δ R) 0 and translate into change differential voltage output, such, can according to the size of the magnetic field is proportional to the principle of differential output voltage, respectively, the corresponding two axis read signal,
Because KMZ52 output signal of a weak, the signal interference is bigger. In the output amplitude is small position, usually has 300 mV and change a lot about the interference; And in the output amplitude, keep constant value approximate. Two way signal amplitude and the relationship between the Angle as shown in figure 4 shows. To make the ratio of both close to tan α? 0 < α < 90 ° change can be in amplitude and larger numerical changes smaller Angle range, make amplitude keep basic unchanged; And in amplitude lesser and numerical changes greatly Angle range, with a function to change its amplitude change curves. The specific implementation, can according to certain Angle to the curve of the block, and the paragraphs with a function y = ax + b to fitting. This way, you can make amplitude change curve close to tan α. View the fine division, the higher accuracy. ?
http://issuu.com/jane329/docs/stm32f103rb___ov7670_camera_kit
http://www.siliconray.com/3-axis-digital-compass-vms5883l-module.html
Z1 and Z4 for flip coil, Z2 Z3 and for compensation loop. Due to the environmental temperature may affect the system precision, therefore, in high precision system, can through the compensation of the coil compensation. There are two orthogonal inside of the magnetic field sensor? Corresponding to the planar X axis and Y axis. The principle of the magnetic field sensor is using magnetic resistance (MR) composition magnetic type structure, so that it can change the electromagnetic material in the external magnetic field in the electrical resistance coefficient. So in the magnetic field sensors to flip the coil Z1 and Z2 loading flip on electrical signal to change after the magnetic field. Because the changes caused by the magnetic field magnetic resistance changes (Δ R) 0 and translate into change differential voltage output, such, can according to the size of the magnetic field is proportional to the principle of differential output voltage, respectively, the corresponding two axis read signal,
Because KMZ52 output signal of a weak, the signal interference is bigger. In the output amplitude is small position, usually has 300 mV and change a lot about the interference; And in the output amplitude, keep constant value approximate. Two way signal amplitude and the relationship between the Angle as shown in figure 4 shows. To make the ratio of both close to tan α? 0 < α < 90 ° change can be in amplitude and larger numerical changes smaller Angle range, make amplitude keep basic unchanged; And in amplitude lesser and numerical changes greatly Angle range, with a function to change its amplitude change curves. The specific implementation, can according to certain Angle to the curve of the block, and the paragraphs with a function y = ax + b to fitting. This way, you can make amplitude change curve close to tan α. View the fine division, the higher accuracy. ?
http://issuu.com/jane329/docs/stm32f103rb___ov7670_camera_kit
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