Analog-to-Digital Conversion

Post on 07-May-2015

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DESCRIPTION

Description of the analog to digital convercion process (ADC). It is becoming more and more widespread to imply progressive technologies into different aspect of both daily and business life. One of the most desired technology that is being implicated into numerous industries is speech–recognition software. In reality, it looks like an operator speaks to his computer/machine/device and sets commands which are performed subsequently. Special voice-recognition software ADC (Analog-to-digital converter) lies in the heart of this process. Its main role is to transform human speech to “computer” speech which set commands. To understand the principle of voice command working, we concentrate on the technology of ADC.

Transcript

ADC Analog

-to-Digital

Conversion

How it works???

Mariia Kreposna

process

Recording voice

Sampling analog voice

Filtering the record

Encoding the samples

Matching segments to phonemes

1

2

3

4

6

Determination of the words

5

the

1 The software records human speech

Filtering

System filters unwanted noise by adjusting the recorded voice to a constant volume level

2

Sampling Analog Voice3

1010__________________________________________1001__________________________________________1000__________________________________________0111_________________________________________0110__________________________________________0101 __________________________________________0100 __________________________________________0011 __________________________________________

Sound waveMeasurementof amplitude

Sample is a single measurement of amplitude.

Minimum sampling rate should be at least twice the highest data frequency of the analog signal.

The larger sampling rate, the better accuracy of conversion

Encoding samples

Each sample is assigned a number according to its amplitude.

0111

1000

1001

0110

1001

0101

4

Matching segments

to phonemes

5100010010110100101010111

uhstffarphor

10001001011010010101

uhstffarph

Findingwords

startt

streamartistteam

6 START

Thank you

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