Thank you everyone for making this the top spectrum analyser application on the market. I am dedicated to making this app work well for you! Risk-free purchase; I will refund your money (even beyond Google's 15 min window) if the app does not work for you.

Features include:
* Both Logarithmic & Linear frequency axis
* Smooth, joyful pinch-to-zoom! Pinch to zoom in on ANY signal section... and zoom... and zoom...
* Pan (vertical and horizontal) by simply dragging the screen
* Dynamically adjusting FFT size, up to 16384 bins (for 2-3 Hz accuracy!), based on the optimal size for your screen.
* Exponential averaging (adjustable)
* Peak hold overlay
* Share screen snapshots easily
* Range set - full audio range from 20Hz, up to 22kHz!
* Peak & valley measurements with crossbar tools
* Adjustable dB levels for ceiling / floor
* And many more!

Designed & tested to work on Honeycomb, Gingerbread, and Froyo.

If you have ANY problems with this release, or requests - email dev@electronchaos.com. I *will* respond, and work towards fixing your issue. And if I can't fix it, I will give you a full refund.

The screenshots show some of the dynamic zooming capabilities, and the linear vs logarithmic modes. The first screenshot shows the analyser in linear mode, while the next shows logarithmic. The screenshots show the mic on the OG Droid phone capturing a test tone at 21kHz, in addition to other frequencies. Nice real-time analyzer!

The last two screenshots show a zoomed in signal at the lower frequency range - same signal sample (paused again), with two different windows applied.

I am honoured and humbled by each and every purchase made; thank you!

Email for contact is dev@electronchaos.com

Thank you everyone for purchasing - the response has been great! I appreciate all the encouraging emails.

Purchases are risk free - I offer refunds past the 15-minute window if it does not work on your hardware for some reason.

H/W Updates across all versions:
All reported hardware issues have been resolved - these are listed below for documentation:

Fix for Toshiba Thrive, and Dell Streak mic input issue.

Fix for Samsung Captivate (Galaxy S SGH)! Thanks for the report Red Baron - if this update fixes your problem, I would appreciate an update to your review.

Contains workaround for the Atrix phone hardware microphone issue. UPDATE: Fix confirmed! Thank you Motorola engineering for the workaround.

My goal is to make a useful spectrum / spectral analyser tool for audio professionals, engineers, installers, etc. Signal processing is useful in many fields, from microphone analysis to RTA, to engineering / technical fields. Let me know how you use it! I find it fascinating the different uses.

Here are the permissions the app requests, and why:

* android.permission.RECORD_AUDIO
To capture audio from the Microphone to display

* android.permission.WRITE_EXTERNAL_STORAGE
Save the graph to an image, and send it via email.

Please feel free to email me with any questions, concerns, requests, etc. I love feedback: dev@electronchaos.com

*****
IMPORTANT: it shows spectrum only for internally played music but not for FM radio or mic, if you have any problems, email me.
Some devices or music players may have problems (really not all), so try free version first.
*****

Make from your phone or tablet a spectrum analyzer for your music.

It show frequency spectrum of music played from your favorite music player running in the background.

Frequency spectrum is shown in logarithmic scale on X approximately from 43Hz to 22kHz and on Y from 0 to -50dB.

from settings menu you can change:
- color theme (11 themes)
- number of channels (from 16 to 96)
- configure bars and peaks speed
- orientation (landscape, portrait, by sensor, ..)

and by long pressing the display you can switch fullscreen mode.

This app is paid version of "Spectrum Analyzer", with some enhancements.

thanks for buying.

*New update*
Increased the FFT size to 44100 samples. Now it's more accurate than ever! Every frequencies can now be detected.

This App inherit many of the same features from our audio signal processing App series.

1. Two graphical displays: 3D Waterfall and 2D spectral graph
2. Fast and accurate: Tested on Droid X with max sample rate of 48kHz with FFT size of 44100, which equates to 1.0 Hz per bin.
3. Zoom in and out capabilities for high data resolutions.
4. Abilities to save and playback recorded data to and from file.
5. Able to transmit recording data over TCP.
6. Five well know Matlab colormaps to choose from.
7. Eight standard windowing functions.
8. Abilities to save settings to avoid redundancy upon next start up.

*Hardware permission*

1. WRITE_SETTINGS - This is needed to change the display from sleeping.
2. RECORD_AUDIO - Data taken from microphone.
3. INTERNET - This is required for transmitting audio data over a socket.
4. WRITE_EXTERNAL_STORAGE - Save recorded audio data to SD for playback.

*NOTE to customers*
Please informed us (idroidbot@gmail.com) if you have any issues running the App on your phone or you are not completely satisfied. We can issue you a refund. Thanks, VT

This App covers the following topics: music, piano, and guitar tuning, spectral analyzer, 3D waterfall, signal processing engineer, FFT, sonar, sound and acoustics.

If you like this app, checkout our other apps: Acoustics Filter, iSpectral, iGram, FastGram and ActivePinger.

*Hardware Note*
Since each phone has different hardware, you may need to increase or decrease your sample rate or FFT size setting to get optimal response.

**** Mini Manual ****
1. Zoom In/Out

The app starts displaying data as soon as you launch it. To zoom in and out, make sure to press the button starting with "Zm" to "Zm On". Once this is selected start dragging the touch screen and release to zooming in. Press the "Back" button to zoom out.

2. To see readout of cursor, make sure to press the "Bar" button to "Bar On" and start touching the screen.

(If you need a more fully featured RTA, with 1/1, 1/3 and 1/6 octave display, RT60, Noise Criteria, A&C Weighting etc. combined with a signal generator, please take a look at my "AudioTool" app in Android Market.)

Suitable for:
- SLM: traffic or ambient noise analysis (TNI, dBA/dBB/dBC, Leq)
- RTA: audio equipment frequency response analysis (spectrum, octaves, peaks, RMS)

This app has much more features (+) than the basic edition (no ads).

>>SLM main features:
• measurements in SPL
• 3 measuring modes (Dynamic, Average, Cumulative)
+ 3 weighting filter curves: dBA, dBB, dBC according to DIN-IEC 651
• simple calibration settings
• sound level versus time chart
• current dB value, avg (Leq), min and max display
• Leq (wideband, RMS of the observation period)
• audio threshold trigger
+ sound level distribution chart
+ accumulated sound level chart
+ current value, L90, L50 and L10 values display
+ TNI (Traffic Noise index) display
+ exporting of measures, chart data (CSV) and screenshot (PNG)
• tested with samsung galaxy S S2 S3 S4
• sharing of text values and screen bmp

>>RTA main features:
+ measurements in SPL
+ 5 spectrum measuring modes (dynamic, average, peak, avg/exp smoothing)
+ sound level versus linear frequency chart
+ sound level versus logarithmic frequency chart (HzLog)
+ 1/1 Octave Bands chart
+ 1/3 Octave Bands chart
+ Microphone Equalizer (Internal or External) in 1/1 Octave bands
+ calibration in 1/1 Octave bands
+ 2 spectrum views (Panel & Chart, Landscape Chart)
+ tap or swipe to select the proper frequency step
+ long press to zoom
+ 4 values versus selected frequency component displayed (current, Leq, max, min)
+ Leq (Octave, RMS of the observation period)
+ Leq (selected frequency, RMS of the observation period)
+ 20hz/22kHz band, 44100 Hz sampling rate
+ adjustable FFT size (up to 8192, about 5 Hz accuracy) , adjustable FPS (up to 20)
+ exporting of measures/chart data (CSV) and screenshot (PNG)

>>Data collection
The application relies on the mobile microphone signal. To achieve the best results consider the following:
1) Easy Calibration (only the first time): Some mobiles are automatically calibrated in the first installation phase. For details see the calibration section of the user manual.
2) keep your fingers away from the mobile microphone
3) silence your phone to avoid any ring tones, vibrations and other sounds
4) orient the phone microphone toward the noise source keeping the correct distance
5) click on the function buttons

>>Troubleshooting
1) Wrong SPL/RTA calibration: See the calibration section
2) No signals detected below 20dB or over 100dB: most smart phone microphones do not work under 20 dB or over 100 dB
3) Signal attenuation near band limits: the mobile mic may attenuate frequencies <100 Hz and >15000 Hz

Read the embedded User Guide: for any info or troubleshooting you can contact us at support@gaiacons.com.

SpecScope is a spectrum analyzer and is the second in the line of engineer applications from NFX Development. The SpecScope incorporates the speed and ease of use to access FFT frequency measurements in a hurry.

The UI maximizes the size of the screen, using gesture control to navigate around the graph measurement.

If you are unhappy in anyway with this product, feel free to contact me and I will help all I can, if I cannot help I will offer a refund at any time (even past the 15 minute google refund mark)

Email : nfxdevelopment@gmail.com

- Logarithmic/Linear measurements
- Pinch to zoom in both X and Y axis
- Simply navigate round the graph by dragging
- Selectable No. bin for accuracy versus speed
- Three settings of spectrum averaging
- Four different windowing options
- Threshold trigger to hold the peak value
- Tap to pause and resume measurements (graph is still navigational in this mode)
- A adjustable sample rate allow analysis from 10 Hz to 22KHz
- Optional measurement markers for ease of reading

Thank you for purchasing, I hope you enjoy! If you have enjoyed this app leave a quick rating and comment. Thanks!!

Analyse captured audio from microphone in three separate panels:
- Osciloscope (time domain),
- Spectrum (instantaneous frequency domain),
- Spectrogram (accumulative frequency domain).

You can display all panels at once (default screen). If you want to see each panel at full-screen, you can simply click on panel and it will be shown full-screen with additional settings that can be changed by pressing buttons. Display can also be paused to take screenshots.

In Spectrum panel values of one or five leading frequencies can also be displayed. Linear or Logarithmic magnitude scale can be chosen. For better peak frequency estimation, special algorithm is applied.

Please share your experience with us. We will do our best to make this application better.

Note:
The internet permissions are used for ads only.

Features in Free Version
* No Ads
* 44100 Hz sampling rate
* 8192 samples per spectrum
* ~5.4 Hz Resolution per point
* Peak Detect of whole spectrum and your local window
* Pinch to Zoom
* Tap to Pause
* Max Hold
* Take Screenshot
* Share on Facebook, Gmail and many more

Features in Premium Version.
* Limited time 99 cent app! Will increase price as more features are added.
* Help out the developer to keep adding more features!
* Beta Log Frequency Scale
* Adjustable sample rate from 8000 Hz to 48000 Hz
* Adjustable Size of FFT up to 100000 samples
* Not limited on Power of 2 sized FFTs (Must be even though)
* Autoscale
* Adjustable Manual Scale

If you purchase the app and don't like it contact me for a refund.

Contact on Reddit: Raspberrywood

User manual:
http://www.digiphd.com/prospec-real-time-spectrum-analyzer-user-manual/

ProSpec is a Real time spectrum analysis tool. It generates a spectrogram on the fly and supports 8kHz, 16kHz, 22kHz and 44.1kHz sampling frequencies.
You can record, playback, save and share the spectrogram. In addition you can change some audio analysis settings. It provides a maximum frequency tracking facility with measurements both in dBFS and SPL (dBA).

Other features include:

- Time scale in seconds
- Real time waveform
- Update speed
- Dynamic range control
- Offline spectrogram analysis tool
- Real time zooming (So you can zoom right in on a frequency)
- Complete color customisation
- RGB option
- For audio engineers, an invert feature for live events in dark rooms
- Snapshot feature allowing you to share, view or save the generated spectrogram externally
- Audio tool, allowing you to share, save and listen to the complete audio that has been recorded (apart of the off-line spectrogram analysis)
- Saving, sharing and exporting the configuration

NOTE: If you are not satisfied or find any issues with ProSpec, please tell me in the discussion group before leaving negative feedback, I may be able to resolve your issue in an update and your input will be invaluable to ProSpec's evolution. Thanks!

USEFUL FOR:

home theatre, audio engineer, car audio, linguistics, speech pathology, electronic engineer, tech savvy musicians, engineering and audiologist students

TECHNICAL INFORMATION

- Up to 4Hz resolution at 8kHz sampling frequency (Adjustable FFT size from (256-2046)
- Uses a moving window to calculate the FFT Magnitude spectrum
- Analysis Windows: Hamming, Hanning, Blackmann and Rectangular
- Frame length adjustable from 10-100ms
- Frame shift fixed to 14ms
- Dynamic range: -1dB to -90dB
- Bandwidth available: 50Hz - 22.05kHz
- Selectable update time from (10-40s)(also depends on frame length)
- Zoom up to a 50Hz region
- JET RGB color scheme (and many many many others)

WORD FROM THE DEVELOPER:

I developed this tool to use personally and I believe it has some use to others in the community. ProSpec also has some major advantages over other real-time spectrogram apps available in the same price bracket. e.g time scale (x-axis labels), frame length, real time frequency zooming, saving settings and sharing the audio and images, SPL, off-line spectrogram analysis, and maximum frequency tracking. These are all features I wanted a single tool to have, ProSpec has been developed to accommodate my needs and hopefully yours.

NOTE ABOUT SPL:

The SPL calculation includes a calibration dB offset. An offset of 0dB is my current calibration for a Motorola Atrix running Android 2.3.4. However, your device will no doubt be different and hence will display the incorrect value. To calibrate properly read the user manual.

Tested Devices (Better suited for dual core devices):

Motorola Xoom with Android 4.0.4 (Good)
Samsung Galaxy S III with Android 4.0.4 (Good)
Sony Xperia S with Android 4.0.4 (Good)
Motorola Atrix 2 with Android 2.3.6 (Good)
HTC Desire HD with Android 2.3.5 (A bit slow)
Motorola Atrix with Android 2.3.4 (Good)
HTC Incredible S with Android 2.3.5 (A bit slow)

As seen above the performance of ProSpec depends to some extent on the hardware of each device. I have done my best to support as many devices as possible, and will continue to do so.

BUGS AND REPORTS:

If you find any bugs or issues please e-mail me (miscanalysis@gmail.com) and include what you were doing at the time the bug occurred so I can fix it. If it happens I can't support your device I WILL REFUND YOUR MONEY.

Like image was synthesised from accumulating sin waves into an audio file.

Features real-time smooth high framerate spectrum diagram! Frequencies between 20Hz and 20kHz!
Scale is logaritmic, what is best for human perception.
Software is using FFT internally.

This application is using advertisement, but it will not create icon or bookmarks on the desktop. We are also not using any push advertisement.

Features:
───────
■ relative reading in dB
■ custom meter fallout speed
■ custom meter calibration
■ source: microphone or music played
■ 11 segment realistic VFD or LED display
■ 11 frequency bands
■ tablet support
■ free

Features in free version:
- FFT resolution up to 10.7Hz! (FFT size: from 512 to 4096 bins)
- 44.1kHz sampling frequency
- several window functions to minimise the leakage effect and increase signal peaks precision
- linear scale
- scaling
- signal averaging
- pause/resume button
- screenshots
- ads free!

To unlock more features, please download PRO version.

Application is stable and has been tested on many different combinations of android devices and android OS versions.

In case you encountered any issue with your device, let us now, we will fix that for you!

This real-time spectrum analyzer / audio visualizer features:
- 128 high-quality frequency bands [20Hz to 22kHz]
- Logarithmic frequency scale to match human perception
- Low latency for high responsiveness
- High framerate to see smooth frequency and amplitude movements
- High performance native code using OpenGL ES 2.0
- FFT window size 2048 @ 43/58(Armv7+) frames per second

Note:
The internet permissions are used for ads.

Any feedback is welcome.

It is very easy to use and offers a lot of useful features: high RTA refreshing rate and frequency resolution, adjustable sound pressure level amplitude scale (up to 150 decibels), RTA peak hold function, flat reference line, local peaks...

RTA measurement can be recorded on 3 separate channels. User can later compare SPL (dB) and frequency response charts between the channels.

It also includes a signal (tone) generator, which helps us measuring the frequency response of a sound system.

Input/output can be adjusted to Internal, AUX or Bluetooth. However, all I/O options and combinations do not work on all devices.

Microphone can be accurately calibrated for each frequency band separately.

*****
IMPORTANT: it shows spectrum only for internally played music but not for FM radio or mic, if you have any problems, email me
*****

Make from your phone or tablet a spectrum analyzer for your music.

It show frequency spectrum of music played from your favorite music player running in the background.

Frequency spectrum is shown in logarithmic scale on X approximately from 43Hz to 22kHz and on Y from 0 to -50dB.

You can change the color by long pressing the display.

This app is very simple without any settings and don't use any extra permissions except for audio.

If you like this, you can buy Spectrum Analyzer 2, where is added settings and some enhancements and which cost less than one beer.

- high dynamics with 20 FFT analysis per second
- auto or manual scale
- log (dB) or linear scale for the amplitude
- log or linear scale for frequency axis
- selectable FFT windowing: flat top, Hanning or rectangular
- zero-padding for better FFT frequency resolution
- selectable sampling frequency, up to 48000 Hz
- performance factor for slow phones
- zoom on the frequency and time axes (drag the axis to zoom)
- multitouch zoom
- cursor on the spectrogram with or without frequency sound reproduction
- innovative auto calibration method, using the in-built speaker. The calibration file can be manually edited with a simple text editor
- editable calibration file
- portrait and landscape display
- rms value of the signal over the displayed frequency range
- overlay with music notes
- no publicity

So do not hesitate any longer and install this app.

Please feel free to comment or post a question on the dedicated Google Group:
https://groups.google.com/forum/?hl=de#!forum/sound-analyser
Of course a direct e-mail is also possible
All comments are very welcome.

If you like the app, please rate it.

Features only available in the PRO version:
- recording time only limited by the device memory
- save sound file as WAV or CSV
- read WAV file for offline analysis
- save spectrogram as high definition PNG
- 3D Waterfall display

Measure the frequency response of your audio equipment, identify tones and noises.

Bugs etc: info@radonsoft.net

If in doubt, check our free RTA .

Bugs, comments to: info@radonsoft.net

Bugs and feedback to: info@radonsoft.net

Test the bandwidth of your phone's speaker (or your ears...), create true uncorrelated noise.

Make sure to check out our Spectral View, RTA and other apps in the Market.

Bugs and comments to support@radonsoft.net

The external address visible to the internet as well as the internal is shown, which may differ in case of WIFI or Proxy connections.

Bugreports to info@radonsoft.net.

A virtual unlimited combination of effects and rooms give you free control over the sound of your voice message. 3D processing adds space when listened in stereo (e.g., headset).

This version allows real-time playback and set-up of all parameter. For saving, ring- notification- and alarm-tone functionality see the pro version of VoiceProcessor.

Feedback and comments to: info@radonsoft.net

App shows up in the live wallpaper list (long tap homescreen)!

Bugs, comments etc.: info@radonsoft.net

Displays remaining battery and current temperature. Stops at 5% battery. Lasts approx. 2h with the G1 at 37°C. Who's battery last longest...?

Comments, bugs to: info@radonsoft.net

Use the pink noise to calibrate our RTA Analyzer, check your audio equipment with noises and sine sweeps.

Bugs, comments to: info@radonsoft.net

A virtual unlimited combination of effects and rooms give you free control over the sound of your voice message. 3D processing adds space when listened in stereo (e.g., headset).

This version allows real-time playback and set-up of all parameter. For saving, ring- notification- and alarm-tone functionality see the pro version of VoiceProcessor.

Feedback and comments to: info@radonsoft.net

The results may optionally be sent to our server, allowing us to build a public database of phone/os version capabilities.

Questions etc. to info@radosoft.net.

Check for unwanted connections, find applications that hold links to the internet, identify VPN or network problems.

Details like name, country, ISP about destination IPs can be retrieved by clicking on the entry.

1.0.3: compat. fix

Bug reports to: info@radonsoft.net

Suggestions and feedback welcome at info@radonsoft.net

Full source code is provided at trakme.radonsoft.net.

1.1:various fixes

Send comments, bugs to info@radonsoft.net

Suggestions and feedback welcome at info@radonsoft.net

App shows up in the live wallpaper list (long tap homescreen)!

Bugs, comments to: info@radonsoft.net