matlab language translation, who helped me translate a paragraph, thank you

If you've learned about limits, you're no stranger to this function. f is a symbolic expression denoted by x, and limit(f,x,a) denotes the limit of f when x approaches a.

If there is only one variable in the f expression, then there is no need to point out x, just use limit(f,a).

And so on. limit(f) defaults to a = 0Equivalent to limit(f,0).

There are left and right limits, so 'left' and 'right' can be used to represent the left and right limits, respectively.

This paragraph is about finding the limit with the limit command in MATLAB

There are 4 usages:

limit(f,x,a): The limit of the expression f when x tends to a.

For example: > syms x;

limit(sin(x),x,pi/2)

ans =1 first defines the minus sign x, and in the above command to find the limit of sin(x) when x is approaching 2, the answer is 1

limit(f,a): If there is only one variable in f, the first command is shortened as limit(f,a).

syms x;

limit(sin(x),pi/2)ans =

limit(f): A further abbreviation when a is equal to 0.

syms x;

limit(sin(x))ans =

limit(f,x,a,'right') and limit(f,x,a,'left'): Find the right and left limits when x tends to a.

For example: > syms x;

limit(tan(x),x,pi/2,'right')

ans =inf

limit(tan(x),x,pi/2,'left')

ans =inf is tan(x) When x tends to 2, the right limit is negative infinity and the left limit is positive infinity.

This is a function of finding the limit. The function is to find the limit of an expression.

limit(f,x,a) finds the limit of f at x=a for a function with x as a variable.

limit(f,a) finds the limit of the function f at the default variable at a.

limit(f) finds the limit of the function f at 0, the default variable.

limit(f,x,a,'right') or limit(f,x,a,'left'Find the right or left limit of the function at x=a.

Open MATLAB. The variable t is set to represent the time, and the step size is in the range from 0 to. These values are used to represent the time normalized to one bit period. Therefore, the 8 bits in that timeframe represent the total. （hint.Use t =

Now, create a carrier signal by creating a function called carrier (t), which is equal to 10 time t sinusoid. Create a simple graph to check, which gives you a sine waveform for 5 cycles of each bit time. (i.e. between time 0 and time 1, it should be a waveform of 5 periods).

Tip: Use the drawing options in MATLAB in your convenient graphics drive). Now create a digital data waveform function, data (t), which represents the unipolar line encoding 10110100 the bit sequence.

You can do this by first setting up a column vector with d, with 8 rows, containing bits of data, and then copying the component d in order to get the vector d'of the same length as t; Tip: Since there is a period of 5 per bit duration, so that the d of each component will be replicated 5 times).

ASK modulated waves.

Create an ask-modulated waveform function ask(t) for multiplying data (t) and carrier (t). [Point to multiplication "*" using MATLAB.]

The plot shows the waveform of the digital data and the ASK modulation waveform.

Method demodulation. ASK demodulation using a square-law geophone is possible. [Hint: The formula given in the attached file of WebCT.] Equations implemented in the "Summation" function in MATLAB].

The method of the resulting graph output. Note that the output'0'During the output, there is a net positive average one'1'bit period period, and zero. However, it also contains high-frequency components because we do not have the carrier harmonics filtered out.

In a real system, this will be done using a digital or analog filter. In this simulation, during this filtering, you can make a rough approximation of the past n samples, where n is a number, and you need to select Move Flat**. Set up a suitable function to generate this average.

Try to figure out how to do it yourself, but if you need a hint, take a look at the CT tip file on the web. If you get an error message that says: "Index out of range" when you do averaging, redefine the local lower limit so that you avoid the sum of negative arguments within the ask(t) function.

work, or do experiments to find out, the best n-value.

Create a chart that shows the filtered output and compare this with the raw data.

How will you use this filtered output to recreate the data that was originally sent?

In this filtering is a rough digital signal processing, a more detailed communication module is an example that you will learn later in the course.

One bit duration is not understood here, ashamed.

Confucianism has the saying of "self-cultivation and family governance and leveling the world", and in this way, "benevolence" can be divided into the people, the family, and the country.

Let's talk about the people. "The slender boat is better than the people, the water is better than the Lishu, the water can carry the boat, and it can also overturn the boat. "Whoever wins the hearts of the people wins the world."

Although this is a way for politicians to play games, the word "people" cannot be ignored. Dongpo degraded Hainan in his later years. At that time, Hainan was a barbarian land, with backward production and slack education.

Dongpo opened a private school, set up education, taught the people to farm, weave, fish and hunt, and flourished agriculture. This is a lot of contributions, and the township respects them.

The people are the foundation of the country and the foundation of culture.

Let's talk about housekeeping. Parents are the eldest in the family, so filial piety is very important. The crow feeds back, the lamb kneels to suckle, and the grass reports the spring.

People are not plants and trees, who can endure and be ruthless? The ancient twenty-four filial piety can only be foolish and filial, and the traces of prosperity are abandoned. Today, Chen Binqiang went to work with his mother.

That cloth belt embodies 20 years of nurturing grace and 5,000 years of cultural inheritance. A cloth belt, embellished with the blood of mother and son, ancient and modern culture, timeless!