All categories

3 years ago

Explain how touch-tone dialing sends digits to the switch and write the name given to define touch-tone dialing.

Computers and Technology

1 answer:

Sergeu [11.5K]3 years ago

4 0

Answer: Please see below as the answer is self-explanatory

Explanation:

Digital phones, normally uses a keyboard, with the digits 0-9, and special characters like # and *.

When the caller presses any keyboard, an electronic circuit within the phone generates two pure sinusoids, of frequencies within the vocal bandwidth (between 300 Hz and 3 khz, roughly), which identifies uniquely (as decoded by the receiving switch) which was the key pressed.

In this way, the switch reconstructs the phone number called, separating country code, area code and the local number as it receives the tones.

This system is called DTMF (dual tone multi frequency).

You might be interested in

What is the value of the totalsString variable after the following code is executed? var totals = [141.95, 212.95, 411, 10.95];

Alex Ar [27]

<h2>Answer:</h2>

141.95|212.95|312.95|10.95|

<h2>Explanation:</h2>

<em>Reformatting the code snippet and giving it line numbers;</em>

1. var totals = [141.95, 212.95, 411, 10.95];

2. totals[2] = 312.95;

3. var totalsString = "";

4. for (var i = 0; i < totals.length; i++) {

5. totalsString += totals[i] + "|";

6. }

Line 1 creates an array called totals with four elements.

First element = totals[0] =141.95

Second element = totals[1] = 212.95

Third element = totals[2] = 411

Fourth element = totals[3] = 10.95

Line 2 replaces the value of the third element <em>totals[2]</em> = 411 with 312.95.

Therefore the array <em>totals = </em>[141.95, 212.95, 312.95, 10.95]

Line 3 creates an empty string called totalsString

Lines 4 - 6 create a for loop that cycles from i=0 to i<totals.length

totals.length = 4 (which is the number of items in the array totals)

This means that the loop cycles from i=0 to i<4

During cycle 1 when i = 0, the expression inside the for loop executes as follows;

totalsString = totalsString + totals[0] + "|" //substitute the values

totalsString = "" + 141.95 + "|"

totalsString = 141.95|

During cycle 2 when i = 1, the expression inside the for loop executes as follows;

totalsString = totalsString + totals[1] + "|" //substitute the values

totalsString = "141.95|" + 212.95 + "|"

totalsString = 141.95|212.95|

During cycle 3 when i = 2, the expression inside the for loop executes as follows;

totalsString = totalsString + totals[2] + "|" //substitute the values

totalsString = "141.95|212.95|" + 312.95 + "|"

totalsString = 141.95|212.95|312.95|

During cycle 4 when i = 3, the expression inside the for loop executes as follows;

totalsString = totalsString + totals[3] + "|" //substitute the values

totalsString = "141.95|212.95|312.95|" + 10.95 + "|"

totalsString = 141.95|212.95|312.95|10.95|

At the end of the execution, totalsString = 141.95|212.95|312.95|10.95|

7 0

3 years ago

Fill in the blank.He wrote me a love blank

saul85 [17]

A love poem. He wrote you a love poem.

3 0

3 years ago

Read 2 more answers

Changing how information is represented so that it can be read by a person is called

Usimov [2.4K]

Answer:

Decode. To change how information is represented so that it can be read by a person.

Explanation:

Decoding is the ability to apply your knowledge of letter-sound relationships, including knowledge of letter patterns, to correctly pronounce written words. Understanding these relationships gives children the ability to recognize familiar words quickly and to figure out words they haven't seen before.

4 0

3 years ago

A type of technology that can be attached to a tag and used to identify postal packages is a(n)

deff fn [24]

Answer: bar code

Explanation: that is what it is

5 0

3 years ago

Suppose income is 4001, what is the output of the following code? if (income > 3000) { System.out.println("Income is greater

grandymaker [24]

Answer:

Output:

Income is greater than 3000

Explanation:

In conditional statements, either the if statement is processed or the else if.

In this scenario, both the given conditions fit for the given output but when if block will be processed, the else if block will be skipped by default.

So the output will only be the out phrase of if block which is:

Income is greater than 3000.

8 0

3 years ago