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OscilloMeter - Spectrum
Analyzer for real-time v.7.01 |
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- Works by algorithm of Fast Fourier
transform (FFT).
- Size of the FFT block is up to 224
samples of an input signal.
- Processing the overlapped time
series of samples of input signals for
combination of the analysis high resolution both
in time and on frequency simultaneously.
- Spectrum analysis uses different
smoothing windows (more than 90 types) for
weighting of input signals in time domain.
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Special modes of
dual-channel FFT spectral analysis:
- Separate channels spectra.
- Spectra of digital sum and
difference of signals of two channels.
- Spectrum of digital product of
signals of two channels.
- Spectrum of digital difference of
original signal and its fundamental.
- Spectrum of digital product of
original signal and its fundamental. Use for
jitter analysis and measurement.
- Real Transfer Function as Ratio of
power of corresponding spectral components versus
frequency.
- Complex Transfer Function as
Vector ratio of corresponding spectral components
versus frequency.
- Cross Spectrum as product of left
channel spectrum and complex conjugate right
channel spectrum.
- Coherence Function.
- All above items can be represented
by special 3-d spectra versus time view
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Program Measures
Signal Parameters
| Mode |
Range |
Inaccuracy
of calculation |
| FFT Spectral Analysis |
190 dB
0...FS / 2 |
0.01 dB
2-24 FS Hz |
| OscilloScope |
0...Full
Scale |
1 LSB |
| Frequency counter |
0...FS
/ 2 |
5·10-8
…5·10-7 of value |
| AC Peak voltmeter |
190 dB |
0.01 dB |
| AC RMS voltmeter |
190 dB |
0.01 dB |
| DC voltmeter |
ADC Full
Scale |
1 LSB |
| Total Power |
190 dB |
0.01 dB |
| Signal-to-Noise Ratio (SNR) |
190 dB |
0.05 dB |
| Signal-to-Noise and
Distortion (SINAD) |
190 dB |
0.05 dB |
| Spurious-Free Dynamic Range
(SFDR) |
190 dB |
0.05 dB |
| Effective Number Of Bits (ENOB) |
0...Full
Scale |
0.1 bit |
| Total Harmonic Distortion (THD) |
190 dB |
0.1 dB |
| Inter-Modulation Distortion
(IMD) |
190 dB |
0.1 dB |
| Phase Shift |
±180° |
0.0001° |
| Group Delay |
±1/2(f1-f2)
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0.1 %
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| Amplitude Distribution |
0...100% |
1 LSB |
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Additional Program
Features
- The obtained data and results of Spectral
Analysis can be saved to files or clipboard.
- Oscilloscope modes (for
dual-channel ADC) are: original signals, sum,
difference, dependence of one channel on another,
dependence of channels sum on channels difference
(stereo-meter), amplitude distribution of input
signals.
- Spectrum analyzer provides
averaging of results of some sequential FFT:
equally weighted - scalar or vector;
exponentially weighted - scalar. Number of
averaging transforms is from 2 up to 20 or
infinite.
- Spectrum analyzer provides
measurement of power in fractionary-octave bands:
from entire octave to its 1/96 part.
- The parameters of noise and
distortion in audio range can be calculated
according to the subjective perception. The
weighing is made under the recommendations of
International electrotechnical commission (IEC-A,B,C,D),
International Radio Consultative Committee (Consultative
Committee on International Radiocommunications -
CCIR-468-2/DIN45405) or ANSI/IEEE743-1384.
- Synchronization of Spectrum
analyzer is independent from the oscilloscope.
- Spectrum analyzer can
display holding or decaying maximum values of
real-time spectra.
- Indication of ADC input overload (clipping).
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- The OscilloMeter - Spectrum
analyzer demo works with ADC of a sound card and
is a fully functional copy of the program with
one exception that input time is limited to 15
seconds after each "Start" button click.
- The registration removes
demonstration limitation of the OscilloMeter -
Spectrum analyzer. See Help (F1)->Registration
for details.
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Multi-Channel
Audio Frequency Sweep Generator
v.5.13 |
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- Is intended for adjusting and
measuring parameters of audio equipment.
- Works with 16-, 24- and 32-bit
sound cards at sampling rate ( FS
) up to 400 kHz. Kernel
Streaming and WDM drivers are supported.
- Real-time signal synthesis.
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Produced Signals
- Single Sinusoidal wave form.
- Up to eight independent
oscillatory processes per each channel with
separate frequency, initial phase and amplitude
controls and adjustable noise pad.
- Sweep frequency sinusoidal signals
in independent channels with separately
adjustable span and sweep rate in a linear or
logarithmic time scale.
- Sine Burst of adjustable duration
with the raise and the fall synchronous to the
carrier.
- Square waveform signals.
- Amplitude-modulated sinusoidal
signals.
- Digital mixing of output channels.
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Noise Generator
Modes
- Dithering – addition of white
noise with uniform or triangular amplitude
distribution and value of 1/2 or 1 least
significant bit (LSB) to output signal.
- White noise with uniform, triangle
or normal distribution.
- Pink noise with spectral density
of 1/f.
- Brownian noise with spectral
density of 1/f2.
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Additional Program
Features
- DAC clock frequency shift
compensation.
- Writing signals to file on hard
disk.
- Cyclic playing of written files.
- Half-tone frequency step.
- Rounding to the nearest frequency
coherent to Spectrum Analyzer-Oscillometer FFT.
- Synchronous Start/Stop under
control of Spectrum Analyzer.
- "Remote control" from
other user applications.
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Sinusoidal Signal
Parameters
| Maximum number of channels |
8 |
| Frequency Span |
0.001 Hz ...
FS / 2 |
| Frequency control step |
0.00001 % |
| Level control span (in 24-bit
mode) |
0…-145 dB |
| Level control step |
0.001 dB |
| Phase shift control span |
±360° |
| Phase shift control step |
0.001° |
| Frequency sweep period |
0.001…9999
s |
Total Harmonic and Inter-Modulation
Distortion
in 24-bit mode without DAC contribution |
-145 dB |
- Total Harmonic and Inter-Modulation
Distortion, high precision and stability of a
frequency is limited only to quality of the used
sound card.
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- The Multi-Channel Audio Frequency
Generator demo is completely functional, but the
time of sounding is limited to 15 seconds after
each clicking of the "Start" button.
- The registration removes
demonstration limitation of the Multi-Channel
Audio Generator. See Help (F1)->Registration
for details.
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Frequently
Asked Questions
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| Each program is provided "AS-IS".
No warranties of any kind, expressed or implied, are made
as to it or any medium it may be on. Any remedy for
indirect, consequential, punitive or incidental damages
arising from it, including such from negligence, strict
liability, or breach of warranty or contract, even after
notice of the possibility of such damages will not be
provided. |
