Audio Analyzer - Time & FFT - Free & No Ads 1.12
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Free Version
Publisher Description
Manual in PDF format:
http://withstrings.com/withstrings_audioanalyzer_manual.pdf
1. Description
WithStrings simple Audio Analyzer acquires a signal from the device's microphone and displays its time history and Fourier amplitude frequency spectrum (using a FFT algorithm). Sampling of the time history starts when the amplitude of the audio acquired at the microphone is greater than the adjustable trigger level slider. The length of acquisition is adjustable from 0.05 seconds to 1 second. Vertical scales for each of the graphs are independently adjustable or can be set to auto-scale.
2. Operation
Launch the application. The cursors are initially off, frequency range is set to 20Khz, and vertical scales are set to Auto mode. Pressing the Run button will start acquisition if the input amplitude is greater than the trigger level. Adjust the Trigger level for the desired sensitivity by moving the red circle on the trigger slider. The Freq(Time) button produces inverse results on the time and frequency graph. A wide frequency setting of 20Khz will produce a very small time sampling window of 0.05 seconds. Conversely a 1Khz frequency range will produce a sampling window of 1 second. A Cursor is available for each graph. Pressing the cursor button one time will set it to peak mode. The peak (positive) will be shown on the graph with cross-hairs on the graph; its x,y coordinates are displayed in blue font on the upper right side of the graph. Pressing the cursor button again will allow the cursor cross- hairs to be dragged to any data point on the graph. The x,y coordinates of this point are displayed in blue font on the upper right side of the display.
Vertical scales are adjustable for each graph. Auto mode will find the best scale to display all of the datum on the graph. Pressing the scale button will set the vertical scale to one of several predefined scales. Clear will erase data and clear both time and frequency graphs. The Lin , Lin chart type button when set to log mode shows the data equaling the log of the value. The x axis can also be displayed in log mode. These modes are ideal to find small frequency peaks or roll off rates. Note the axis labels are not log values.
The Save/Send button will capture the time and frequency graph to a comma separated variable file in the following directory: .../Android/data/com.withstrings.audioanalyzer/files. Note all data in this directory will be erased if the app is un-installed. When the save button is pressed a dialog will appear where the file just produced can be sent elsewhere by one of the email apps on the device. There are six columns in the exported chart. The first two are from the time graph showing time and audio amplitude. The next two columns are frequency and amplitude from the Fourier amplitude spectrum. The following are the log of the frequency and amplitude.
3. Characteristics
Operating System: Android: Minimum Version 5.1 (API 22) Lolipop
Permissions: RECORD_AUDIO
Max Acquisition Rate: 44100 samples/s, Number of Samples: 4096 @ 20KHz(0.05s)
Min Acquisition Rate: 2756 samples/s, Number of Samples: 4096 @ 1KHz(1s)
Settings:
Run/Pause
Trigger Slider: 0 to 100% of sampled RMS value.
Time Graph Vertical Scales: 32K, 16K, 8K, 4K, 2K, 1K
Freq Graph Vertical Scales: 64M, 32M, 16M, 8M, 4M, 2M
Freq/Time Scales: 20KHz(0.05s), 10KHz(0.1s), 5KHz(0.2s), 2KHz(0.5s),
1KHz(1s)
Frequency Plots: x axis: linear or log; y axis: linear or log
Cursor: Off, Peak, Slider (Time and Frequency Graphs)
Save/Email: Data writes to the following file in Pause mode:
../Android/data/com.withstrings.audioanalyzer/files. The file can also
be sent via email at the time the Save/Email button is pressed.
Identity: sin(u)sin(v) = 1/2[sin(u-v) + sin(u+v)]
Graphics Design: N. Dynamite
Inspiration: Fr. McKenzie
Crashes: Yes
© 2019 Todd Merport
About Audio Analyzer - Time & FFT - Free & No Ads
Audio Analyzer - Time & FFT - Free & No Ads is a free app for Android published in the Audio File Players list of apps, part of Audio & Multimedia.
The company that develops Audio Analyzer - Time & FFT - Free & No Ads is Todd Merport. The latest version released by its developer is 1.12.
To install Audio Analyzer - Time & FFT - Free & No Ads on your Android device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2021-07-05 and was downloaded 23 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the Audio Analyzer - Time & FFT - Free & No Ads as malware as malware if the download link to com.withstrings.audioanalyzer is broken.
How to install Audio Analyzer - Time & FFT - Free & No Ads on your Android device:
- Click on the Continue To App button on our website. This will redirect you to Google Play.
- Once the Audio Analyzer - Time & FFT - Free & No Ads is shown in the Google Play listing of your Android device, you can start its download and installation. Tap on the Install button located below the search bar and to the right of the app icon.
- A pop-up window with the permissions required by Audio Analyzer - Time & FFT - Free & No Ads will be shown. Click on Accept to continue the process.
- Audio Analyzer - Time & FFT - Free & No Ads will be downloaded onto your device, displaying a progress. Once the download completes, the installation will start and you'll get a notification after the installation is finished.
