Analogue-digital conversion model

Ref:185020
• Analogue-digital (AD) and digital-analogue (DA) conversion
• Real world applications of sound
• Integrated memory
• Data used by datalogging tools or a memory oscilloscope
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Data sheet Analogue-digital conversion model

Description

Based on a simple electrical signal, the
student assesses the impact of 2 parameters
that infl uence the conversion: the sampling
frequency and the resolution.
A bar graph at the front of the device displays
the binary word corresponding to the digitised
information.
Subsequently, the method is applied in a more
practical manner to the sound.
An input jack allows a sound to be directly
recorded (via a microphone or a music player).
This sound can then be reproduced on a loudspeaker
via a digital analogue conversion and
listened to several times with different conversion
parameters.In this way, it is possible to make the link with
music compression formats like MP3.
Resolution: 2, 4, 8 and 10 bits.
Sampling frequency: 1, 5, 10 and 20 kHz.
SRAM memory integrated.
Bar graph to display the binary word.
3.5 mm input jack or Ø 4 mm safety sockets.
Output Ø 4 mm safety sockets low impedance for 32 Ω
headset.
Power supply: 12 V mains adapter supplied.

Specifications

Resolution: 2, 4, 8 and 10 bits.
Sampling frequency: 1, 5, 10 and 20 kHz.
SRAM memory integrated.
Bar graph to display the binary word.
3.5 mm input jack or Ø 4 mm safety sockets.
Output Ø 4 mm safety sockets low impedance for 32 Ω
headset.
Power supply: 12 V mains adapter supplied.

The use of a low-frequency generator is advisable to study the simple electrical signal.
The data can be exploited using a memory oscilloscope or datalogging tools.
See corresponding chapters.
Theme: human histology A/D - D/A conversions
Analogue-digital conversion

1. Sampling

2. Quantification
Modify the resolution value (2, 4, 8 and 10 bits) and compare the input and output signals.

3. Digitisation
During digitisation, time and voltage are associated with a pair of numeric values.

Practical Exercise: conversion and reproduction of a sound signal

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