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SAMPLE CHAMPION TUTORIALS
Examples

 

SAMPLE CHAMPION TUTORIALS

 

The following tutorials require the Macromedia Flash Player plug-in installed in your browser.

If you cannot visualize this sample movie, the Flash Player plug-in must be downloaded here (installer for Windows) or here (automatic installer inside the browser)

 

The tutorials can be viewed online or downloaded and viewed offline. A small software is provided for viewing offline the movies.



 

ONLINE VERSION

 

1
File Name 01-1024x0774-firststep.swf
Program mode and use REAL-TIME MEASUREMENT
Configuration LOOPBACK
Topics Loopback measurement FFT Spectrum frequency resolution
CLICK HERE

2
File Name 02-1024x0774-freqanalysis.swf
Program mode and use POST-PROCESSING
Configuration N/A
Topics Loudspeaker impulse response Anechoical part Data windowing Spectrum Overlay
CLICK HERE

3
File Name 03-1024x0774-loopbackanalysis.swf
Program mode and use POST-PROCESSING
Configuration N/A
Topics Data windowing FFT Pink filtering
CLICK HERE

4
File Name 04-1024x0774-puretone.swf
Program mode and use REAL-TIME MEASUREMENT
Configuration LOOPBACK
Topics Scope plot Synchronous sampling Data windowing FFT Harmonic distortion
CLICK HERE

5
File Name 05-1024x0774-scopeananalysis.swf
Program mode and use POST-PROCESSING
Configuration N/A
Topics WAV file loading Spectrum Data windowing FFT
CLICK HERE

6
File Name 06-1024x0774-stereofreqanalysis.swf
Program mode and use POST-PROCESSING
Configuration N/A
Topics Spectrum 2 channels analysis
CLICK HERE

7
File Name 07-1024x0774-distortioneff.swf
Program mode and use REAL-TIME MEASUREMENT
Configuration LOOPBACK
Topics Input level settings Distortion
CLICK HERE

8
File Name 08-1024x0774-sampleratemismatch.swf
Program mode and use REAL-TIME MEASUREMENT
Configuration LOOPBACK
Topics Soundcard sample rate and measurement sample rate
CLICK HERE

9
File Name 09-1024x0774-rta.swf
Program mode and use REAL-TIME MEASUREMENT, RTA
Configuration LOOPBACK
Topics RTA measurement FFT Narrow band and 1/3 octave Repeat and average mode
+ 10 File Name 10-0321x0274-rta-movie.swf
CLICK HERE

11
File Name 11-1024x0774-roomacpar.swf
Program mode and use POST-PROCESSING, Room Acoustics Plugin
Configuration N/A
Topics ISO 3382 acoustical parameters Schroeder plot
CLICK HERE

12
File Name 12-1024x0774-rtx.swf
Program mode and use POST-PROCESSING, Room Acoustics Plugin
Configuration N/A
Topics Room Acoustics Schroeder plot Reverberation Time
CLICK HERE

13
File Name 13-0987x0617-freqaver.swf
Program mode and use REAL-TIME MEASUREMENT
Configuration LOOPBACK
Topics Average and repeat mode
CLICK HERE

14
File Name 14-0987x0617-autolatcal.swf
Program mode and use REAL-TIME MEASUREMENT
Configuration LOOPBACK
Topics Automatic latency calibration
CLICK HERE

15
File Name 15-0987x0617-manlatcal.swf
Program mode and use REAL-TIME MEASUREMENT
Configuration LOOPBACK
Topics Manual latency calibration
CLICK HERE

16
File Name 16-0987x0617-amplcalib.swf
Program mode and use REAL-TIME MEASUREMENT, RTA
Configuration LOOPBACK
Topics Amplitude calibration FFT
CLICK HERE

17
File Name 17-1024x0774-waterfall.swf
Program mode and use POST-PROCESSING, Waterfall Plugin
Configuration N/A
Topics Loudspeaker impulse response Waterfall analysis
CLICK HERE

18
File Name 18-1024x0774-spectrogram.swf
Program mode and use POST-PROCESSING, Enhanced View
Configuration N/A
Topics Spectrum Phase wrapped and unwrapped Nyquist plot Energy Time Curve Spectrogram
CLICK HERE

19
File Name 19-1024x0774-crosscorr.swf
Program mode and use REAL-TIME MEASUREMENT, RTA
Configuration LOUDSPEAKER + MICROPHONES
Topics Cross-correlation
+ 20 File Name 20-0321x0274-crosscorr-movie.swf
CLICK HERE

21
File Name 21-1024x0774-lissajous.swf
Program mode and use REAL-TIME MEASUREMENT, RTA
Configuration LOUDSPEAKER + MICROPHONES
Topics Lissajous figures
+ 22 File Name 22-0321x0274-lissajous-movie.swf
CLICK HERE

23
File Name 23-1024x0774-corrmeter.swf
Program mode and use REAL-TIME MEASUREMENT, RTA
Configuration LOUDSPEAKER + MICROPHONES
Topics Correlation meter
+ 24 File Name 24-0321x0274-corrmeter-movie.swf
CLICK HERE

25
File Name 25-0321x0274-louspeakermeas-movie.swf
Movie showing a loudspeaker measurement example.
CLICK HERE

26
File Name 26-0321x0274-signalnosignalmls-movie.swf
Loopback configuration.
Movie showing 2 measurement cases:
Synch REC/PLAY (MLS ON)
REC only (MLS OFF):
CLICK HERE

 


1

File Name
01-1024x0774-firststep.swf

Program mode and use

REAL-TIME MEASUREMENT
MAIN Program

Configuration

LOOPBACK

Topics covered

Loopback measurement
FFT
Spectrum
Actual frequency resolution


Scope and impulse response window are opened and a loopback measurement is performed. The impulse is windowed and its FFT is computed. It is shown how to display the full spectrum range. The actual resolution due to data window length can be observed in the lower part of the spectrum: a longer data window leads to a better frequency resolution.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


2

File Name
02-1024x0774-freqanalysis.swf

Program mode and use

POST-PROCESSING
MAIN Program

Configuration

N/A

Topics covered

Loudspeaker impulse response
Anechoical part
Data windowing
Spectrum Overlay


A loudspeaker impulse response is loaded. The anechoical part is already windowed (this information is contained in the file). The FFT of the anechoical part is computed and shown. Different data windowing are shown. The Spectrum Overlay function is used to save different spectra

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


3

File Name
03-1024x0774-loopbackanalysis.swf

Program mode and use

POST-PROCESSING
MAIN Program

Configuration

N/A

Topics covered

Data windowing
FFT
Pink filtering


A loopback impulse response is loaded. Time data are wrapped to the right using post processing functions. A portion of data is windowed using the Full Blackman-Harris weighting window. The FFT of selected data is plotted. The effect on the spectrum of changings in the time data window position and length are shown. The spectrum is flat in narrow band. The spectrum is shown in 1/3 octave: each successive band increments of 1 dB in amplitude with frequency. A time domain pink filtering is applied to the impulse response: the 1/3 octave bands now have the same amplitude. The FFT plot is shown again in narrow band: the spectrum shows a constant decrease of 3 dB/octave. Data window is moved to show the effect in the frequency domain. An inverse time domain pink filtering is applied to the impulse response: the spectrum becomes flat again

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


4

File Name
04-1024x0774-puretone.swf

Program mode and use

REAL-TIME MEASUREMENT
MAIN Program

Configuration

LOOPBACK

Topics covered

Scope plot
Synchronous sampling
Data windowing
FFT
Harmonic distortion


- Selection of a 1000 Hz pure tone in signal generator.

- Scope plot and synchronous sampling of the signal.

- FFT of the data windowed in scope plot.

- Effect of different window lengths and types.

- Harmonic distortion in FFT plot.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


5

File Name
05-1024x0774-scopeananalysis.swf

Program mode and use

POST-PROCESSING
MAIN Program

Configuration

N/A

Topics covered

WAV file loading
Spectrum
Data windowing
FFT


How to load a WAV file as scope (and not as impulse response) is shown. A WAV file containing a 1 kHz pure tone is loaded. Its spectrum is computed using different data window lengths and types, in narrow-band and 1/3 octave modes.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


6

File Name
06-1024x0774-stereofreqanalysis.swf

Program mode and use

POST-PROCESSING
MAIN Program

Configuration

N/A

Topics covered

Spectrum
2 channels analysis


A 2 channels impulse response file is loaded. The spectra of selection A and selection B are shown in 2 different FFT windows. Channel assignment to selections A and B are shown.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


7

File Name
07-1024x0774-distortioneff.swf

Program mode and use

REAL-TIME MEASUREMENT
MAIN Program

Configuration

LOOPBACK

Topics covered

Input level settings
Distortion


1) A loopback mesurement is performed. The input level is too high. The distortion leads to many spikes in the time domain, instead than to a clean impulse.

2) the input level is lowered and the loopback mesurement is repeated. The new measurement shows a perfectly clean impulse response.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


8

File Name
08-1024x0774-sampleratemismatch.swf

Program mode and use

REAL-TIME MEASUREMENT
MAIN Program

Configuration

LOOPBACK

Topics covered

Soundcard sample rate and measurement sample rate


- The sample rate of the soundcard has been fixed at 44.1 kHz.

- When the sample rate in Sample Champion is 44.1 kHz the measured impulse response is clean and still (OK).

- The sample rate in Sample Champion is set at 48 kHz, while the sample rate of the soundcard is still fixed at 44.1 kHz. Now the measured impulse and scope move because of the resampling alghorithms of the sound card drivers.

SOUNDCARD INTERNAL SAMPLE RATE AND SAMPLE CHAMPION SAMPLE RATE MUST BE ALWAYS THE SAME!

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


9

File Name
09-1024x0774-rta.swf

Program mode and use

REAL-TIME MEASUREMENT
MAIN Program
RTA Window

Configuration

LOOPBACK

Topics covered

RTA measurement
FFT
Narrow band and 1/3 octave
Repeat and average mode


Settings required for RTA measurement. 1 kHz pure tone has been selected as signal generator. Check of real-time measurement of the input signal in the scope window. Frequency analysis of real-time sampled data in the RTA window, in narrow band and 1/3 octave (repeat mode). Average mode is enabled: the background noise in the FFT spectrum decreases at each successive sampling cycle.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.

10

File Name
10-0321x0274-rta-movie.swf

Movie describing the above screen capture.

Click here to view the movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


11

File Name
11-1024x0774-roomacpar.swf

Program mode and use

POST-PROCESSING
Room Acoustics Plugin

Configuration

N/A

Topics covered

ISO 3382 acoustical parameters
Schroeder plot


A 256K samples long room impulse response has been loaded.. The room acoustics plugin is opened. Schroeder plot is shown and ISO 3382 acoustical parameters are computed.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


12

File Name
12-1024x0774-rtx.swf

Program mode and use

POST-PROCESSING
Room Acoustics Plugin

Configuration

N/A

Topics covered

Room Acoustics
Schroeder plot
Reverberation Time


Manual selection of a portion of the Schroeder plot and computation of Reverberation Time on a limited decay range.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


13

File Name
13-0987x0617-freqaver.swf

Program mode and use

REAL-TIME MEASUREMENT
MAIN Program

Configuration

LOOPBACK

Topics covered

Average and repeat mode


1) A loopback mesurement is performed in repeat mode. The impulse is clean and its spectrum perfectly flat.

2) A noise (music and words) is mixed to the input signal and a new loopback mesurement is performed in repeat mode. The disturbing signal can be seen in the scope window and in the spectrum.

3) The average mode is enabled and a new loopback mesurement is performed: the disturbing signal is attenuated at each successive mesurement cycle.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


14

File Name
14-0987x0617-autolatcal.swf

Program mode and use

REAL-TIME MEASUREMENT
MAIN Program

Configuration

LOOPBACK

Topics covered

Automatic latency calibration


Procedure for automatic latency calibration. Buffer and MLS are set at the same length. The latency calibration is disabled and a loopback measurement is performed. The peak shows a displacement due to hardware and software delays. The automatic latency calibration procedure is then applied and a second loopback measurement is performed. Now the peak is located at t = 0.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


15

File Name
15-0987x0617-manlatcal.swf

Program mode and use

REAL-TIME MEASUREMENT
MAIN Program

Configuration

LOOPBACK

Topics covered

Manual latency calibration


The procedure for manual latency calibration is shown.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


16

File Name
16-0987x0617-amplcalib.swf

Program mode and use

REAL-TIME MEASUREMENT
MAIN Program
RTA Window

Configuration

LOOPBACK

Topics covered

Amplitude calibration
FFT


Step by step procedure for amplitude calibration. A loopback connection and the internal signal generator are used. A similar procedure is required when an external calibrator is used. The system is calibrated for a 94 dB pure tone. The calibration is verified in the RTA window. Narrow band, 1/3 octave and 1/1 octave frequency data are plotted. The real-time measured peak at 1 kHz shows an amplitude value of 94 dB (+/- 0.01dB)

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


17

File Name
17-1024x0774-waterfall.swf

Program mode and use

POST-PROCESSING
Waterfall Plugin

Configuration

N/A

Topics covered

Loudspeaker impulse response
Waterfall analysis


Waterfall analysis of a loudspeaker impulse response

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


18

File Name
18-1024x0774-spectrogram.swf

Program mode and use

POST-PROCESSING
Main Program
Enhanced View Plugin

Configuration

N/A

Topics covered

Spectrum
Phase wrapped and unwrapped
Nyquist plot
Energy Time Curve
Spectrogram


A loudspeaker impulse response is loaded. The frequency content of the anechoical part is shown in different ways (spectrum, phase wrapped and unwrapped, Nyquist plot, Energy Time Curve) in the Enhanced View Plugin. A room impulse response is loaded. The spectrogram of the room impulse response is computed and plotted. A comparison between the spectrogram and the simple time data plot is shown.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


19

File Name
19-1024x0774-crosscorr.swf

Program mode and use

REAL-TIME MEASUREMENT
RTA Window

Configuration

LOUDSPEAKER + MICROPHONES

Topics covered

Cross-correlation


The cross-correlation function in RTA window is shown. The effect has been obtained by means of a real-time measurement of an MLS signal generated by Sample Champion, played by a loudspeaker and sampled synchronously by two microphones. One microphone was kept still while the other has been moved. The displacement of the peak of the cross-correlation function gives information about the time delay between the signals.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.

20

File Name
20-0321x0274-crosscorr-movie.swf

Movie describing the above screen capture.

Click here to view the movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


21

File Name
21-1024x0774-lissajous.swf

Program mode and use

REAL-TIME MEASUREMENT
RTA Window

Configuration

LOUDSPEAKER + MICROPHONES

Topics covered

Lissajous figures


Time data of channel 1 and channel 2 are plotted in an XY graph, generating the classic Lissajous figures. This effect has been obtained by means of a real-time measurement of a 1 kHz tone generated by Sample Champion, played by a loudspeaker and sampled synchronously by two microphones. The first microphone has been kept still while the other has been moved, in order to obtain a phase difference between the signals.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.

22

File Name
22-0321x0274-lissajous-movie.swf

Movie describing the above screen capture.

Click here to view the movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


23

File Name
23-1024x0774-corrmeter.swf

Program mode and use

REAL-TIME MEASUREMENT
RTA Window

Configuration

LOUDSPEAKER + MICROPHONES

Topics covered

Correlation meter


The correlation meter function in RTA window is shown. The effect has been obtained by means of a real-time measurement performed on a 1 kHz tone generated by Sample Champion, played by a loudspeaker and sampled synchronously by two microphones. The first microphone has been kept still while the other has been moved, in order to obtain a phase difference between the signals.

Click here to view the screen capture movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.

24

File Name
24-0321x0274-corrmeter-movie.swf

Movie describing the above screen capture.

Click here to view the movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


25

File Name
25-0321x0274-louspeakermeas-movie.swf

Movie showing a loudspeaker measurement example.

Click here to view the movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


26

File Name
26-0321x0274-signalnosignalmls-movie.swf


Loopback configuration.

Movie showing 2 measurement cases:

Synch REC/PLAY (MLS ON): - Signal shown in the X4 USB soundcard's VU-meters
- Impulse peak on the upper plot
- MLS signal on the lower plot

REC only (MLS OFF): - No signal shown in the X4 USB soundcard's VU-meters
- Random noise on the upper plot (with autoscale ON)
- No signal on the lower plot

When there is no signal on input, the computed impulse response will be noise.

 

Click here to view the movie.

After clicking press F11 to view full screen, if required.
After finished press ALT+F4 to close the movie window.


 



OFFLINE VERSION


Click here

(Requires username and password (provided to registered users).
If you are interested in our product, feel free to ask us username and password for downloading the offline version at sctutor@purebits.com

 

Instructions: download the archive, unzip it in the same folder. Run the player and select a movie. No installation required. The Macromedia Flash Player must be installed in your system (see link at top of page).


HARDWARE CONFIGURATION

 

Gear used for the tutorials: our X4 USB soundcard, an U24 USB soundcard, 2 microphones (based on Panasonic WM-61B electret capsules), a 6 W power amplifier (Texas Instruments 6W Class D Audio Power Amplifier TPA3005D2), a small loudspeaker and a laptop computer.

 

 

For loopback measurements, a simple JACK-JACK cable has been used:

 

 

LINE IN has been connected directly to LINE OUT:

 

 

For loopback measurements, another possible connection, using an RCA-RCA cable, is the following:

 

 

 

 

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