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英语翻译Analog-To-DigitalconversionThefirstessentialstepinanalog-to-digital(A/D)conversionistosampleananalogsingnal.Thisstepisperformedbyasampleandholdcircuit,whichsamplesatregularintervalscalledsamplingintervals.The
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英语翻译
Analog-To-Digital conversion
The first essential step in analog-to-digital(A/D) conversion is to sample an analog singnal.This step is performed by a sample and hold circuit,which samples at regular intervals called sampling intervals.The length of the sampling interval is the same as the sampling period,and the reciprocal of the sampling periodis the sampling frequency fs.According to the Nyquist theorem,a signal with a maximum frequency of W HZ(called a band-limited signal) must be sampled at least 2W samples per second to ensure accurate recording.When this minimum is not respected,distortion called aliasing occurs.Aliasing causes high frequency signals to appear as lower frequency signals.To be sure aliasing will not occur,sampling is always preceded by low pass filtering.The low pass filter,called the anti-aliasing filter,removes all frequencies above half the selected sampling rate.
After a brief acquisition time,during which a sample is acqured,the sample and hold circuit holds the sample steady for the remainder of the sampling interval.This hold time is needed to allow time for an A/D converter to gennerate a digital code that best corresponds to the analog sample.
The A/D converter chooses a quantization level for each analog sample.An N-bit converter chooses among 2N possible quantization levels.The larger the number of levels,the smaller the quantization errors,calculated as the difference between the quantized level and the true sample level.Most quantization errors are limited in size to half aquantization step Q.The quantization step size is calculated as Q=R/2N ,where R is the full scale range of the analog signal and N is the number of bits used by the converter .The strength of the signal compared to that of the quantization errors is measured by dynamic range and signal-to-noise ratio .
A digital signal is represented by a set of vertical lines with circles at the top to mark the quantization levels selected for each sample .The bit rate for an A/D converter is the Nfs ,where fs is the sampling rate .
Finally ,each digital sample is assigned a digital code ,which completes the A/D process .The result is a digital bit stream .It is this collection of digital codes that is processed in digital signal processing .
To summarize ,A/D comprises anti-aliasing ,sampling ,quantization and digitisation.
ADCs come in almost as many flavors as ice creams ,and at least as much care is needed in choosing the former as is required with the latter .
A popular and readily understood type of ADC is the Flash ADC .This is capable of very high-speed conversion and thus can accommodate high sampling rates ,but in its basic form is very power hungry .
Analog-To-Digital conversion
The first essential step in analog-to-digital(A/D) conversion is to sample an analog singnal.This step is performed by a sample and hold circuit,which samples at regular intervals called sampling intervals.The length of the sampling interval is the same as the sampling period,and the reciprocal of the sampling periodis the sampling frequency fs.According to the Nyquist theorem,a signal with a maximum frequency of W HZ(called a band-limited signal) must be sampled at least 2W samples per second to ensure accurate recording.When this minimum is not respected,distortion called aliasing occurs.Aliasing causes high frequency signals to appear as lower frequency signals.To be sure aliasing will not occur,sampling is always preceded by low pass filtering.The low pass filter,called the anti-aliasing filter,removes all frequencies above half the selected sampling rate.
After a brief acquisition time,during which a sample is acqured,the sample and hold circuit holds the sample steady for the remainder of the sampling interval.This hold time is needed to allow time for an A/D converter to gennerate a digital code that best corresponds to the analog sample.
The A/D converter chooses a quantization level for each analog sample.An N-bit converter chooses among 2N possible quantization levels.The larger the number of levels,the smaller the quantization errors,calculated as the difference between the quantized level and the true sample level.Most quantization errors are limited in size to half aquantization step Q.The quantization step size is calculated as Q=R/2N ,where R is the full scale range of the analog signal and N is the number of bits used by the converter .The strength of the signal compared to that of the quantization errors is measured by dynamic range and signal-to-noise ratio .
A digital signal is represented by a set of vertical lines with circles at the top to mark the quantization levels selected for each sample .The bit rate for an A/D converter is the Nfs ,where fs is the sampling rate .
Finally ,each digital sample is assigned a digital code ,which completes the A/D process .The result is a digital bit stream .It is this collection of digital codes that is processed in digital signal processing .
To summarize ,A/D comprises anti-aliasing ,sampling ,quantization and digitisation.
ADCs come in almost as many flavors as ice creams ,and at least as much care is needed in choosing the former as is required with the latter .
A popular and readily understood type of ADC is the Flash ADC .This is capable of very high-speed conversion and thus can accommodate high sampling rates ,but in its basic form is very power hungry .
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Analog-To-Digital conversion
The first essential step in analog-to-digital(A/D) conversion is to sample an analog singnal.This step is performed by a sample and hold circuit,which samples at regular intervals called sampling intervals.The length of the sampling interval is the same as the sampling period,and the reciprocal of the sampling periodis the sampling frequency fs.According to the Nyquist theorem,a signal with a maximum frequency of W HZ(called a band-limited signal) must be sampled at least 2W samples per second to ensure accurate recording.When this minimum is not respected,distortion called aliasing occurs.Aliasing causes high frequency signals to appear as lower frequency signals.To be sure aliasing will not occur,sampling is always preceded by low pass filtering.The low pass filter,called the anti-aliasing filter,removes all frequencies above half the selected sampling rate.
After a brief acquisition time,during which a sample is acqured,the sample and hold circuit holds the sample steady for the remainder of the sampling interval.This hold time is needed to allow time for an A/D converter to gennerate a digital code that best corresponds to the analog sample.
The A/D converter chooses a quantization level for each analog sample.An N-bit converter chooses among 2N possible quantization levels.The larger the number of levels,the smaller the quantization errors,calculated as the difference between the quantized level and the true sample level.Most quantization errors are limited in size to half aquantization step Q.The quantization step size is calculated as Q=R/2N ,where R is the full scale range of the analog signal and N is the number of bits used by the converter .The strength of the signal compared to that of the quantization errors is measured by dynamic range and signal-to-noise ratio .
A digital signal is represented by a set of vertical lines with circles at the top to mark the quantization levels selected for each sample .The bit rate for an A/D converter is the Nfs ,where fs is the sampling rate .
Finally ,each digital sample is assigned a digital code ,which completes the A/D process .The result is a digital bit stream .It is this collection of digital codes that is processed in digital signal processing .
To summarize ,A/D comprises anti-aliasing ,sampling ,quantization and digitisation.
ADCs come in almost as many flavors as ice creams ,and at least as much care is needed in choosing the former as is required with the latter .
A popular and readily understood type of ADC is the Flash ADC .This is capable of very high-speed conversion and thus can accommodate high sampling rates ,but in its basic form is very power hungry .
sujinbi - 试用期 一级
答复共 9 条
o
回答者：hebeaf - 试用期 一级 4-5 18:55
d
回答者：hebeag - 试用期 一级 4-5 19:09
always preceded by low pass filtering.The low pass filter,called the anti-aliasing filter,removes all frequencies above half the selected sampling rate.
After a brief acquisition time,during which a sample
回答者：狗狗爱猫猫N8变 - 初入江湖 二级 4-5 19:47
dfdzxf
回答者：ioip909 - 见习魔法师 二级 4-6 10:46
sample steady for the remainder of the sampling interval.This hold time is needed to allow time for an A/D converter to gennerate a digital code that best corresponds to the analog sample.
The A/D converter chooses a quantization level for each analog sample.An N-bit converter chooses among 2N possible quantization levels.The larger the number of levels,the smaller the quantization errors,calculated as the difference between the quantized level and the true sample level.Most quantization errors are limited in size to half aquantization step Q.The quantization step size is calculated as Q=R/2N ,where R is the full scale range of the analog signal and N is the number of bits used by the converter .The strength of the signal compared to that of the quantization errors is measured by dynamic range and signal-to-noise ratio .
回答者：我叫苏玉龙 - 秀才 二级 4-7 10:17
123
回答者：我晕有人哈哈 - 助理 二级 4-7 17:31
asfsfdasdfasdfasdfadsfasdffgt
回答者：f0z - 兵卒 一级 4-7 21:32
这是向量问题的典型错误
(a*b)*c中a*b 是一个数量,由共线向量a=xb得知(a*b)*c表示平行于c 的向量,同理(b*c)*a表示平行于a 的向量,(a*b)*c与(b*c)*a模不一定相等故命题错误
The first essential step in analog-to-digital(A/D) conversion is to sample an analog singnal.This step is performed by a sample and hold circuit,which samples at regular intervals called sampling intervals.The length of the sampling interval is the same as the sampling period,and the reciprocal of the sampling periodis the sampling frequency fs.According to the Nyquist theorem,a signal with a maximum frequency of W HZ(called a band-limited signal) must be sampled at least 2W samples per second to ensure accurate recording.When this minimum is not respected,distortion called aliasing occurs.Aliasing causes high frequency signals to appear as lower frequency signals.To be sure aliasing will not occur,sampling is always preceded by low pass filtering.The low pass filter,called the anti-aliasing filter,removes all frequencies above half the selected sampling rate.
After a brief acquisition time,during which a sample is acqured,the sample and hold circuit holds the sample steady for the remainder of the sampling interval.This hold time is needed to allow time for an A/D converter to gennerate a digital code that best corresponds to the analog sample.
The A/D converter chooses a quantization level for each analog sample.An N-bit converter chooses among 2N possible quantization levels.The larger the number of levels,the smaller the quantization errors,calculated as the difference between the quantized level and the true sample level.Most quantization errors are limited in size to half aquantization step Q.The quantization step size is calculated as Q=R/2N ,where R is the full scale range of the analog signal and N is the number of bits used by the converter .The strength of the signal compared to that of the quantization errors is measured by dynamic range and signal-to-noise ratio .
A digital signal is represented by a set of vertical lines with circles at the top to mark the quantization levels selected for each sample .The bit rate for an A/D converter is the Nfs ,where fs is the sampling rate .
Finally ,each digital sample is assigned a digital code ,which completes the A/D process .The result is a digital bit stream .It is this collection of digital codes that is processed in digital signal processing .
To summarize ,A/D comprises anti-aliasing ,sampling ,quantization and digitisation.
ADCs come in almost as many flavors as ice creams ,and at least as much care is needed in choosing the former as is required with the latter .
A popular and readily understood type of ADC is the Flash ADC .This is capable of very high-speed conversion and thus can accommodate high sampling rates ,but in its basic form is very power hungry .
sujinbi - 试用期 一级
答复共 9 条
o
回答者：hebeaf - 试用期 一级 4-5 18:55
d
回答者：hebeag - 试用期 一级 4-5 19:09
always preceded by low pass filtering.The low pass filter,called the anti-aliasing filter,removes all frequencies above half the selected sampling rate.
After a brief acquisition time,during which a sample
回答者：狗狗爱猫猫N8变 - 初入江湖 二级 4-5 19:47
dfdzxf
回答者：ioip909 - 见习魔法师 二级 4-6 10:46
sample steady for the remainder of the sampling interval.This hold time is needed to allow time for an A/D converter to gennerate a digital code that best corresponds to the analog sample.
The A/D converter chooses a quantization level for each analog sample.An N-bit converter chooses among 2N possible quantization levels.The larger the number of levels,the smaller the quantization errors,calculated as the difference between the quantized level and the true sample level.Most quantization errors are limited in size to half aquantization step Q.The quantization step size is calculated as Q=R/2N ,where R is the full scale range of the analog signal and N is the number of bits used by the converter .The strength of the signal compared to that of the quantization errors is measured by dynamic range and signal-to-noise ratio .
回答者：我叫苏玉龙 - 秀才 二级 4-7 10:17
123
回答者：我晕有人哈哈 - 助理 二级 4-7 17:31
asfsfdasdfasdfasdfadsfasdffgt
回答者：f0z - 兵卒 一级 4-7 21:32
这是向量问题的典型错误
(a*b)*c中a*b 是一个数量,由共线向量a=xb得知(a*b)*c表示平行于c 的向量,同理(b*c)*a表示平行于a 的向量,(a*b)*c与(b*c)*a模不一定相等故命题错误
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