Miscellaneous

What is the relationship between sampling rate and frequency?

What is the relationship between sampling rate and frequency?

The sampling frequency or sampling rate, fs, is the average number of samples obtained in one second, thus fs = 1/T. Its units are samples per second or hertz e.g. 48 kHz is 48,000 samples per second.

What is the relation between multiplexing and the sampling frequency in a data acquisition system?

Multiplexing reduces the rate at which data can be acquired from an individual channel because of the time-sharing strat- egy between channels. For example, an ADC that can sample a single channel at 100 kHz is limited to a 12.5 kHz/channel sampling rate when measuring eight channels.

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What is the problem with frequency multiplexing?

The first disadvantage is found in computer-based systems that multiplex multiple channels over a single medium. Since the frequencies are statically assigned, devices that do not have anything to transmit are still assigned frequencies and thus bandwidth is wasted.

What happens when sampling frequency is increased?

The higher the sampling frequency, the easier it is for a low-pass filter to extract the original signal with no (significant) loss of information, because the filter transition band falls between the copies of the signal spectrum.

What is the difference between sampling rate and sampling frequency?

Sampling rate (sometimes called sampling frequency or Fs) is the number of data points acquired per second. A sampling rate of 2000 samples/second means that 2000 discrete data points are acquired every second. The inverse of sampling frequency (Fs) is the sampling interval or Δt.

What is the difference between sampling period sampling interval sampling rate and sampling frequency?

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The sampling period is the time difference between two consecutive samples in a Sound. It is the inverse of the sampling frequency. For example: if the sampling frequency is 44100 Hz, the sampling period is 1/44100 = 2.2675736961451248e-05 seconds: the samples are spaced approximately 23 microseconds apart.

What is the application of signal conditioner?

The main function of a signal conditioner is to pick up the signal and convert it into a higher level of electrical signal. Signal conversion is often used by industrial applications that use a wide range of sensors to perform measurements.

What is multiplexing in ADC?

Multiplexing is the process of scanning through a number of input channels, and sampling each in rotation. In multiplexed systems, only one ADC is needed to acquire data from (potentially) many channels.

What is the difference between frequency time and statistical multiplexing?

In frequency division multiplexing all the signals operate at the same time with different frequencies, but in time division multiplexing all the signals operate with same frequency at different times. The time slots are pre-assigned and fixed. This slot is even given if the source is not ready with data at this time.

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What type of signals are used by frequency division multiplexing?

The most common example of frequency-division multiplexing is radio and television broadcasting, in which multiple radio signals at different frequencies pass through the air at the same time. Another example is cable television, in which many television channels are carried simultaneously on a single cable.

How does sampling rate affect the signals?

As the sampling frequency decreases, the signal separation also decreases. When the sampling frequency drops below the Nyquist rate, the frequencies will crossover and cause aliasing. Experiment with the following applet in order to understand the effects of sampling and filtering.