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From Wikipedia

Frequency distribution


Univariate frequency tables




Joint frequency distributions








Function generator




Analog function generators usually generate a triangle waveform as the basis for all of its other outputs. The triangle is generated by repeatedly charging and discharging a capacitor from a constant current source. This produces a linearly ascending or descending voltage ramp. As the output voltage reaches upper and lower limits, the charging and discharging is reversed using a comparator, producing the linear triangle wave. By varying the current and the size of the capacitor, different frequencies may be obtained. Sawtooth waves can be produced by charging the capacitor slowly, using a current, but using a diode over the current source to discharge quickly - the polarity of the diode changes the polarity of the resulting sawtooth, i.e. slow rise and fast fall, or fast rise and slow fall.

A 50% duty cyclesquare wave is easily obtained by noting whether the capacitor is being charged or discharged, which is reflected in the current switching comparator's output. Other duty cycles (theoretically from 0% to 100%) can be obtained by using a comparator and the sawtooth or triangle signal. Most function generators also contain a non-linear diode shapingcircuit that can convert the triangle wave into a reasonably accurate sine wave. It does so by rounding off the hard corners of the triangle wave in a process similar to clipping in audio systems.

A typical function generator can provide frequencies up to 20 MHz. RF generators for higher frequencies are not function generators in the strict sense since typically produce pure or modulated sine signals only.


Some function generators can also generate white or pink noise.

More advanced function generators use Direct Digital Synthesis (DDS) to generate waveforms. Arbitrary waveform generators use DDS to generate any waveform that can be described by a table of amplitudes.

Other meanings

Another type of function generator is a sub-system that provides an output proportional to some mathematical function of its input; for example, the output may be proportional to the square root of the input. Such devices are used in feedback control systems and in analog computers.

From Yahoo Answers

Question:how can i construct a grouped frequency distribution table from the following data? 41 32 67 44 46 47 36 53 56 45 31 43 25 33 25 38 48 57 42 49

Answers:I guess you could sort it into intervals. Intervals Frequency 1-10 0 11-20 0 21-30 2 31-40 5 41-50 9 51-60 3 61-70 1

Question:Math. Hva eno idea what it is. I tried looking it up and there was a bunch of different answers. Please explain how to make the table too. Thanks.

Answers:A frequency distribution table lists out the various observations of a variable together with their corresponding frequencies The process of preparing a frequency distribution table involves listing of the various observations of the variable For example Marks secured by students of a class in a slip test 0,1,2,3,4,5,so on upto the maximum marks. Then the number of students securing identical marks are indicated as the frequency of the marks concerned If seven students got 5 marks each then the frequency of the marks 5 shall be taken as 7 The table with the variable and frequency is termed as frequency distribution table In case there is large difference between the largest and smallest items the variable may be shown in the form of classes For ex. 0 to 10, 10 to 20, 20 to 30, so on...Then the students securing marks between the limits of the class shall be taken as frequency

Question:What is the difference between each of them? Are they all the same thing with different names???

Answers:They all belong to the same family of instruments, but there are differences in their characteristics: A frequency generator, or oscillator, creates a sine wave of the selected amplitude and frequency. A function generator is like a frequency generator, but in addition to sine waves, it can usually create other waveshapes: like square waveforms, triangular waveforms, ramping waveforms, etc. A pulse generator creates a square "pulse" waveform where you can select the pulse amplitude, pulse width and pulse repetition rate (including just sending a single pulse).



From Youtube

Frequency table :I created this video using my Logitech QuickCam software

Letter Frequency Generator :This is part of a project that I am working on. It takes a text file containing English words and calculates the letter frequencies between A and Z and displays the frequencies calculated. This program is written using Qt4.