Concept Development and End Product

Description

Concept Generation

Portable Audio EqualizerObjectives1. The system should have excellent sound quality.2. The system should have easy equalization3. The system should be of light weight4. The system should be low cost

Constraints1. The system must be portable2. The system will be an add-on to existing MP3 player

Audio Equalizer

Input Amplifier

Automatic Level

controlALC

Graphic Equalizer

Single Transistor +

OPAMP

Dual OPAMP Analog Logarithmic

Amplifier

Microcontroller + variable Gain Amplifier Active Filter

Digital Filter

Pasive Filter

Analog Filter

Concept Fan

Advantages DisadvantagesLow Cost Not meany featuresEasy to Implement Low Signal to Noise ratio

Digital Filter

Graphic Equalizer

Single Transistor + OPAMP

Dual OPAMP

Analog Logarithmic

Microcontroller + variable Gain

Active Filter

Passive Filter

Input Amplifier Automatic Level control ALC

Concept Combination Table

Advantages DisadvantagesModerate Cost Fully FeaturedModerate to Implement Low Signal to Noise ratio

Digital Filter

Graphic Equalizer

Single Transistor + OPAMP

Dual OPAMP

Analog Logarithmic

Microcontroller + variable Gain

Active Filter

Passive Filter

Input Amplifier Automatic Level control ALC

Concept Combination Table

Advantages DisadvantagesModerate Cost Fully FeaturedModerate to Implement Higher Signal to Noise ratio

Digital Filter

Graphic Equalizer

Single Transistor + OPAMP

Dual OPAMP

Analog Logarithmic

Microcontroller + variable Gain

Active Filter

Passive Filter

Input Amplifier Automatic Level control ALC

Concept Combination Table

Sound Quality. Easy Equalization Light Weight Low CostSound Quality. 1 5 3 3

Easy Equalization 1/5 1 1 3Light Weight 1/3 1 1 2

Low Cost 1/3 1/3 1/2 1

1 = equal 3 = moderate 5 = strong 7 = very strong 9 = extreme

Sound Quality. Easy Equalization Light Weight Low Cost G. Mean wSound Quality. 1.00 5.00 3.00 3.00 2.59002 0.53

Easy Equalization 0.20 1.00 1.00 3.00 0.880112 0.18Light Weight 0.33 1.00 1.00 2.00 0.903602 0.19

Low Cost 0.33 0.33 0.50 1.00 0.485492 0.10Total 4.859226

totalMeanGwAAAMeanG NN

/.)(.

1

21

Concept Selection

If a contraint is NoConstraints That Option must be DiscardedMust be PortableAdd-on to existing MP3 P.

Objectives wSound Quality. 0.53 3.00 1.59 3 1.59 5 2.65 5 is Maximum

Easy Equalization 0.18 4.00 0.72 5 0.90 5 0.90Light Weight 0.19 5.00 0.95 4 0.76 4 0.76

Low Cost 0.10 5.00 0.5 5 0.50 3 0.303.76 3.75 4.61

Option 1YesYesYes

Option 2YesYesYes

Option 3YesYesYes

Concept Selection

End Product Description

Level 0 Equalizer FunctionalityAudio Input Signal

Equalizer Control Audio output Signal

Power

Module

Inputs

Outputs

Functionality

Audio Equalizer

Equalized Audio : 1V peak to peak

- Audio input: 1V peak to peak- Power 120 VAC, 60 Hz- Equalization Settings

Equalize the input audio signal to provide desired frequency content

Audio Equalizer

Level 1 Equalizer Functionality

Buffered Input Constant Amplitude Signal

Audio Input Equalized Signal

Module Audio Equalizer

Inputs

Outputs

Functionality

Repeat as necessary

Power 120 VAC, 60Hz

- Audio input: 1V peak to peak- Regulated +/- 12 VDC

- Provides high input impedance- Provides low output impedance

Low impedance buffered input

Pre AmplifierAutomatic Lecel

control (ALC) Digital Filter

Power Supply

Level 2 Equalizer Functionality

Buffered Input Signal Constant Amplitude Signal

Gain Control Output Sample

DC Voltage input

DC Voltage input

Variable GainAmplifier

Microcontroller

Embedded Systems Require additional Information

Module

Inputs

Outputs

Functionality

- Audio output sample- Regulated + 5 VDC

- Gain Control Signal

Microcontroller

StartSample Audio Output

Low Level?

Amplify Control

High Level?

Attenuate Control

Yes

YesNo

No

Continue until the next step is to place

components

Portable Audio EqualizerMarketing Requireme

ntsEngineering Requirements Justification

1, 2, 4 1. The total harmonic distortion should be <0.1%.

Based upon competitive benchmarking and existing amplifier technology. Class A, B, and AB amplifiers are able to obtain this level of THD.

2, 4 1. Should have three band equalization

Achievable with few components and very popular

3 - A 1. Weight should not exceed 1 pound

User will have to carry it while walking

Portable Audio Equalizer3-B 1.The dimensions

should not exceed 2” x 2”x 1”.

Unit will interconnect with existing equipment

4-A 1.Production cost should not exceed $15.

This is based upon competitive market analysis and previous system designs.

Objectives1. The system should have excellent sound quality.2. The system should have easy equalization3. The system should be of light weight4. The system should be low costConstraintsA. The system must be portableB. The system will be an add-on to existing MP3 player

Summarize Specs in one table

Other Deliverables Power Point Presentation Final Report User Manual etc