WithStrings AudioGenerator Manual 1. Description AudioGenerator
Contents
1. WithStrings AudioGenerator Manual 1 Description AudioGenerator streams data to the audio output music stream of an Android device using the user selected function frequency and amplitude Waveforms available are sine square and noise Frequency is selected with multiplier buttons and sliders Audio output amplitude can be adjusted from 0 100 with the amplitude slider A numeric readout doubles as a play pause button It shows frequency period and nearest musical note based on A 440Hz for sine and square Signals noise contains an assortment of frequencies Figure 1 shows the controls and readouts Warning Andriod devices can generate high volumes Don t do anything foolish PS 57 19 26 Audio Generator Frequency Frequency Multiplier X 20 x 200 X 2000 Coarse X0 1 to X10 Coarse Adjustment Fine Hz Fine Adjustment ccoo D Waveform Function Select Sine Square Noise Amplitude 0 to 100 Amplitude Adjust Play Pause and Numeric Readouts Figure 1 AudioGenerator User Interface 2014 Todd Merport 2 Operation Launch the AudioGenerator application The initial settings are for a sine wave at 440Hz with a 50 amplitude The Play Pause button can be pressed and a 440Hz tone will be generated Pressing the Play Pause button again will stop the output Playing or paused any slider or button can be adjusted to change the frequency waveform or amplitude Note that audio outputs are AC co2. upled The output creates a network with external devices such as ear buds or amplifiers The interaction with the devices and internal coupling is evident when a square wave is selected There are several oscilloscope images in section four that show the Square wave output at various frequencies The test setup is shown as well 3 Characteristics Operating System Android Minimum API 9 Gingerbread Permissions None Audio Output Rate 44100 samples per second Audio Mode Monophonic Frequency Accuracy 0 2 Hz Output Amplitude Amplitude slider 100 35mv pp G10Hz sine 700mv pp 10Khz sine These are device and terminating circuit dependent Settings Frequency 10Hz to 20KHz Square wave to 2Khz Functions Sine Square Nose Amplitude to 100 on Music Stream Play Pause Note Display Range C 16 4Hz to B 7902Hz Devices Tested HTC Incredible 2 Google Nexus 7 2013 Identity sin u sin v 1 2 sin u v sin u tv Graphics Design N Dynamite 2014 Todd Merport 4 Waveforms and Test Setup Sine Wave 440Hz Noise d Square Wave 10 Hz Square Wave 40Hz 2014 Todd Merport Square Wave 440 Hz Square Wave 4 4KHz Square Wave 20KHz FEF iii Gj 5316A UNIVERSAL COUNTER koooes t 3 Test Circuit ye ee ee Lhbshd L Test Circuit and setup a 2014 Todd Merport
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