Spectrum Analyzers with DPX™ Live RF spectrum display effectively characterize time-variant signals and solve unexpected problems. DPX™ Live RF spectrum display is standard on all Real-Time Spectrum Analyzers ranging from handheld to high performance benchtop instruments.
* Performance Spectrum Analyzers integrate revolutionary DPX™ Live RF spectrum display with the industry-leading dynamic range and bandwidth combination.
* Mid-Range Spectrum Analyzers deliver performance capabilities, including DPX™ Live RF spectrum display and frequency masked trigger, for complete time-correlated analysis in the frequency, time and modulation domains
* Handheld Spectrum Analyzers scan the RF environment, reliably classify signals, and locate signals with the industry's only integrated mapping solution.
Thursday, July 22, 2010
Spectrogram
Spectrogram is an audio frequency spectrum analyzer that runs on a PC. The latest version is available from Visualization Software. You can download and evaluate it for 10 days. An earlier version of Spectrogram was released a few years ago as freeware and many people have found it is still very adequate for aligning ham receivers, like the Elecraft K2. You can download this earlier version 5.17 here.
After downloading the zip file to a folder, unzip it and it's ready to go! This is one of the friendliest Windows programs I've ever seen. No installation Wizard, no modifications to your registry, just download and run. Makes you wonder why all Windows programs aren't like this :-) Richard Horne has done a terrific job of coding a very useful program.
There are several parameters that can be set up to suit your taste. Here's a screen shot showing some settings that I've found useful. The "FFT size (points)" selection is one of the most interesting controls that you may want to experiment with.
Here's an example of a display while looking at the audio output of an Elecraft K2 transceiver. The audio signal for the PC sound card can be taken across the headphone jack (with the headphones plugged in) or from the external speaker jack.
Tom Hammond, N0SS, has written several very good articles on using Spectrogram.
Another good tutorial on Spectrogram by John Grebenkemper, KI6WX.
After downloading the zip file to a folder, unzip it and it's ready to go! This is one of the friendliest Windows programs I've ever seen. No installation Wizard, no modifications to your registry, just download and run. Makes you wonder why all Windows programs aren't like this :-) Richard Horne has done a terrific job of coding a very useful program.
There are several parameters that can be set up to suit your taste. Here's a screen shot showing some settings that I've found useful. The "FFT size (points)" selection is one of the most interesting controls that you may want to experiment with.
Here's an example of a display while looking at the audio output of an Elecraft K2 transceiver. The audio signal for the PC sound card can be taken across the headphone jack (with the headphones plugged in) or from the external speaker jack.
Tom Hammond, N0SS, has written several very good articles on using Spectrogram.
Another good tutorial on Spectrogram by John Grebenkemper, KI6WX.
SIGVIEW spectrum analyzer
SIGVIEW is a real-time signal analysis software package with wide range of powerful FFT spectral analysis tools, statistics functions and a comprehensive visualization system.
SIGVIEW is distributed as shareware - you can download a completely functional version and use it for 21 days to find out if it suits your needs. If you decide to use SIGVIEW after that period, you will have to purchase a license. The license key will unlock the time-limited trial version and entitle you to e-mail support, free minor upgrades and possible customization options.
With its unique user interface and philosophy, SIGVIEW gives you absolute freedom to combine different signal analysis methods in any possible way - there are no artificial rules and limitations. Once you get the basics, everything else in SIGVIEW follows the same logical pattern.
Support for wide range of data acquisition devices, from professional DAQ cards to standard sound cards. Various options for triggering, decimation and file-logging are included. Following device types are supported:
* NIDAQ and NIDAQmx compatible DAQ devices from National Instruments® (Please click here to get NI devices at very affordable price).
* All Measurement Computing® DAQ devices (Please click here to get MC devices at very affordable price).
* All Microsoft Windows® compatible sound cards (DirectSound and ASIO driver models are supported)
Real time data display, signal analysis and control. You can work on live signals and observe results immediately.
Import and export of signal files in numerous formats: WAV, MP3, ASCII, WMA, AU, AIFF, SND, 8/16/32-bit binary files, EDF...
Optimized FFT algorithm with fine parameter tuning and various pre- and postprocessing options: windowing, zero-padding, power spectrum and PSD, automatic averaging, test for spectral peaks integrity,...
Spectrogram and Time-FFT functions with powerful graphical display solutions
Dual channel (cross-spectral) analysis (cross spectrum, coherence, cross corelation,...)
Signal filtering (Bandstop, Bandpass, Lowpass, Highpass)
Real time arithmetic operations on signals (subtract, multiply, add, scale, normalize...)
Various statistics functions: peak hold, averaging, smoothing, removing linear trend, probability distribution... Analog-style instruments for real-time display of important signal parameters
Custom filter curves can be freely defined and applied directly to time-domain signal or to calculated spectrum
Advanced signal display and handling options: unlimited overlays, unlimited number of markers and annotations for each signal, parallel display (EEG style), cut/copy/paste signal parts, unlimited zoom-in levels, VCR-style commands for audio playing,...
Signal generator including sine signal, white and pink noise, step signal, sweep signal,...
Graphical block diagram environment improves productivity when working with complex analysis systems
Custom tools and workspaces can be created and later reused or exchanged with other Sigview users
Various command-line options for automation and remote control from external applications or batch files
No artificial or license-based limitations: million points FFTs can easily be calculated, dozens of signals can be combined and analyzed at the same time.
SIGVIEW is distributed as shareware - you can download a completely functional version and use it for 21 days to find out if it suits your needs. If you decide to use SIGVIEW after that period, you will have to purchase a license. The license key will unlock the time-limited trial version and entitle you to e-mail support, free minor upgrades and possible customization options.
With its unique user interface and philosophy, SIGVIEW gives you absolute freedom to combine different signal analysis methods in any possible way - there are no artificial rules and limitations. Once you get the basics, everything else in SIGVIEW follows the same logical pattern.
Support for wide range of data acquisition devices, from professional DAQ cards to standard sound cards. Various options for triggering, decimation and file-logging are included. Following device types are supported:
* NIDAQ and NIDAQmx compatible DAQ devices from National Instruments® (Please click here to get NI devices at very affordable price).
* All Measurement Computing® DAQ devices (Please click here to get MC devices at very affordable price).
* All Microsoft Windows® compatible sound cards (DirectSound and ASIO driver models are supported)
Real time data display, signal analysis and control. You can work on live signals and observe results immediately.
Import and export of signal files in numerous formats: WAV, MP3, ASCII, WMA, AU, AIFF, SND, 8/16/32-bit binary files, EDF...
Optimized FFT algorithm with fine parameter tuning and various pre- and postprocessing options: windowing, zero-padding, power spectrum and PSD, automatic averaging, test for spectral peaks integrity,...
Spectrogram and Time-FFT functions with powerful graphical display solutions
Dual channel (cross-spectral) analysis (cross spectrum, coherence, cross corelation,...)
Signal filtering (Bandstop, Bandpass, Lowpass, Highpass)
Real time arithmetic operations on signals (subtract, multiply, add, scale, normalize...)
Various statistics functions: peak hold, averaging, smoothing, removing linear trend, probability distribution... Analog-style instruments for real-time display of important signal parameters
Custom filter curves can be freely defined and applied directly to time-domain signal or to calculated spectrum
Advanced signal display and handling options: unlimited overlays, unlimited number of markers and annotations for each signal, parallel display (EEG style), cut/copy/paste signal parts, unlimited zoom-in levels, VCR-style commands for audio playing,...
Signal generator including sine signal, white and pink noise, step signal, sweep signal,...
Graphical block diagram environment improves productivity when working with complex analysis systems
Custom tools and workspaces can be created and later reused or exchanged with other Sigview users
Various command-line options for automation and remote control from external applications or batch files
No artificial or license-based limitations: million points FFTs can easily be calculated, dozens of signals can be combined and analyzed at the same time.
Spectrogram for iPhone
A spectrogram shows you what frequencies you are hearing over time. The color of a pixel in the graph shows how much sound energy is occurring at that particular frequency and time.
* Adjustable sensitivity
* Discover images hidden in music.
* Logarithmic or Linear frequency scale.
* Analyzes frequencies up to 20kHz!
* 2048 FFT window size.
* Frequency scale can be toggled on/off.
* Pause capability.
* Save screen captures to your Camera Roll by pressing the Sleep/Wake & Home buttons together.
* Adjustable sensitivity
* Discover images hidden in music.
* Logarithmic or Linear frequency scale.
* Analyzes frequencies up to 20kHz!
* 2048 FFT window size.
* Frequency scale can be toggled on/off.
* Pause capability.
* Save screen captures to your Camera Roll by pressing the Sleep/Wake & Home buttons together.
Spectrum Analyzer Real-time FFT
Eight-channel Audio Spectrum Analyzer is a set of Real-Time Multi-Channel Gauges for investigation of data accepted from any ADC you will want or 16-, 24- and 32-bit ADC of sound card. WDM drivers support. FFT Spectrum Analysis, OscilloScope, Frequency counter, AC/DC voltmeter, Signal-to-Noise Ratio, Signal-to-Noise and Distortion, Spurious-Free Dynamic Range, Effective Number Of Bits, Total Harmonic Distortion, Inter-Modulation Distortion, Phase Shift. Special modes of dual-channel FFT spectral analysis: Separate channels spectra, Spectra of digital sum, difference, product of two signals, Spectrum of digital product of original signal and its fundamental, Spectrum of Real and Complex Transfer Function, Cross Spectrum. Standart weighing of spectra according IEC and CCIR. Oscilloscope modes (for dual-channel ADC) are: original signals, sum, difference, dependence of one channel on another, amplitude distribution of input signals.
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