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This reference manual is written for RA Version 2.0.0.1 and Version 3.1.6.8. Check the version of your RA (Help menu > Version information) before reading this document.  

For users of Version 5.x.x.x, read the reference manual for Version 5.

Last updated: 2004/09/06

1. Main Window
2. Signal Generator
1. Tone
2. Noise
3. Sweep
4. Pulse
3. FFT Analyzer
4. Oscilloscope
5. Impulse Response
6. Running ACF
7. Preset
8. Keyboard shortcut

Last updated: 2004/05/24

1. Main Window of RA

1-1. Menu bar 

*Alphabets after the item name ( _ ) show the shortcut keys. 

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1-2. "Input Device" and  "Peak Level Monitor" 

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1-3. Function buttons on the main window of RA

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2. Signal Generator

In the signal generator, several kinds of the test signals are generated automatically. Tone, noise, sweep, and pulse signals can be controlled and generated separately with an easy operation.

Common items in "Signal Generator"

Four functions of "Signal Generator"

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2-1. Tone

Explanation of the options in "Tone"

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2-2. Noise

Explanation of options in "Noise"

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2-3. Sweep

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2-4. Pulse



Explanation of the options in "Pulse"

Option	Description
Width of Pulse	Set up width of pulse [ms].
Number of Pulse	The number of output. If [Interlock] is checked, the output is repeated.
Period	Set up a period [ms].
Polarity	Set up polarity of a waveform.

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3. FFT Analyzer

In the FFT analyzer, 2ch spectum analyzer, octave band analyzer, TEF (time-energy-frequency) analyzer, and correlation meter are available. 

3-1. Common items of the FFT analyzer

Commands or options	Descriptions
Input	Measurement starts with the [Start] button. Time counter starts when the Start button is clicked and the elapsed time is displayed here during the measurement. The time count lasts until the output is finished.
Calibration	The calibration of microphone are done. ->3-3. Microphone calibration
Level	Peaks of energy level for L (= left) and R (= right) are shown respectively [dB]. By a left-click on the graph, the energy level at the frequency where you clicked on is indicated. By a right-click, the total level is indicated.
Frequency	Peaks of frequency for L (= left) and R (= right) are shown respectively [Hz].
Resolution	Resolution is shown, which depends on a FFT size and a sampling rate. F: frequency [Hz]. It shows the interval, at which the data is obtained. T: time [ms].
Split L-R	If this checkbox is checked when the "2 ch" is selected, screen is split in two and data for each channel are displayed separately.
Exit	Finishes the "Realtime Analyzer".
Level Range	A setting of an indicated range of energy level (= vertical axis).
Freq. Range	A setting of an indicated range of frequency (= horizontal axis).
Sampling Rate	Set a sampling rate of A/D conversion.
FFT Size	A block size of FFT (Fast Fourier Transform).
Time Window	The time window is used to decrease extra frequencies, Select the time window which meets the case. Rectangular: Rectangular window Hamming: Hamming window Hanning: Hanning window Blackman :Blackman window more info about time window
Freq. Weighting	Select characteristics of auditory-filter from Flat, A-weighting, B-weighting, and C-weighting.
Channels	1ch: One channel (light blue) 2ch: Two channels (light blue and red)
Freq. Axis	A setting of the scale on frequency axis. Logarithm: A rate is constant. Linear: A difference is constant.
Time Resolution	Speed of real-time display is specified. "1x" (standard), "2x" (double) and "4x" (4 times) can be specified as a refresh rate of a real-time display.
Moving Average	If the time is specified (1sec to 10sec, or until measurement end), The average value of specified period is displayed.
Smoothing	An indicated line is smoothed by averaging with a value here. If the value is large, the line is easy to see, but the response is getting slower.
Peak Detection	Peak: A peak is indicated with blue (In the case of 2 channels, blue and red).
	Peak Hold: Peak indication lasts for some seconds (Green). When "Manual Reset" is chosen, peak indication is done until the "Reset" button is pushed. When "Auto Reset" is chosen, peak indication is done during the specified period.
Number of Data	The number of time axes which are indicated in "Waterfall".
Direction of Axis	Direction of the time axis in "Waterfall". When [Forward] is selected, the time shifts forward on the screen. When [Backward] is selected, the time shifts backward.
Correlation	ACF: Autocorrelation is displayed. CCF: Crosscorrelation is displayed. Moving the "Zoom" slider makes it possible to zoom the correlation function to a suitable scale on time-axis.
	maximize button : click to enlarge the measurement screen close button : click to close the analyzer window

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3-2. Measurement windows

目次へ戻る

3-3．Microphone calibration

The Calibration dialog as below opens by clicking the Calibration button on the FFT analyzer.  When the program is installed, no calibration data appears. To save a microphone data, click the Edit button. 

When the Edit button is clicked, the Calibration dialog expands and the edit window appears as below. On this window, the sensitivity calibration and the edit of frequency response curve are done. See the microphone setting in the operation guide for how to edit and save the microphone data. 

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4. Oscilloscope

The waveform of the input signal is observed. Vertical axis is amplitude and horizontal axis is time. When "X-Y" check box is marked, horizontal axis is left channel's amplitude and vertical axis is right channel's amplitude. The mark on the left of window indicates the point of trigger start level.

Supplementary information of an oscilloscope New! 2004/01/20

The oscilloscope is generally used in checking an operation of electronic circuits. Voltage variations in a short time, or its oscillating waveforms are measured in real time. RA's oscilloscope not only measure the voltage waveform, but also waveforms of various signals through the input devices. 

Input devices as below can be used by the oscilloscope. 

When measuring the voltage signal by using the electronic probe, the maximum input level of the sound mixer should be checked before the measurement. Usually, it ranges from 1.0 and 1.5 V. 

The oscilloscope displays the input waveform as a digital value between -32767 and +32766. The values corresponds to the maximum voltage of the sound mixer.

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4-1. Items of the Oscilloscope 

Item		Description
Level Range		Adjustment of amplitude (1 to 32768). There is [Automatic] function.
Position		A vertical position of a waveform is adjusted with a ruler for each channel. If [Single] button is clicked, the waveform is arranged at the middle of window. If [Dual] button, two waveforms are arranged vertically.
Sweep Time Range		Time range for one graduation on the horizontal axis [ms].
Delay Time		An interval from the input to the display [ms]. Set the range of 'B', by selecting 1ms, 10ms, 100ms, or 1000ms from a pop menu (A). Then, adjust the delay time (= It is shown in the box 'C') with a ruler (B). For example, when you select "1ms" from a pop menu (A), The scales of a ruler (B) mean from 0ms to 1ms. When you select "10ms" in A, the scales of B mean from 0ms to 10ms.
Trigger Settings		Trigger settings are done here.
	Level	Trigger level is set up. This is the starting point of a waveform. There is an automatic adjustment function (Check [Auto] box.)
	Channel	Select the channel which becomes the object of trigger settings.
	Slope	The timing of trigger. - Ascent: When a waveform gets over the trigger level in upward direction, the trigger is pulled. (A waveform starts upward.) - Descent: When a waveform gets over the trigger level downward, the trigger is pulled. (A waveform starts downward.)
	Highcut	High frequency noise is cut.
	Lowcut	Low frequency noise is cut.
	Relative	With a check here, it is indicated relatively. Without a check, an absolute position is shown.
	Indicator	The starting level of trigger is indicated with "" mark.
	Auto Trigger	If you check here, the indication is performed even when it has no trigger for a certain period of time.
	Single	Stops with the first indication.
	Reset	You can reset with [Reset] button, after you use [Single] function.
Lch Inverse		Inverts a waveform of left channel up and down.
Rch Inverse		Inverts a waveform of right channel up and down.
X-Y		Indicates the left channel as a vertical axis and the right channel as a horizontal axis. It is shown with green.
Sampling Rate		A sampling rate of A/D conversion.
Channels		-1ch: One Channel(blue) -2ch: Left and right, two channels(blue and red)
Start (Stop)		Starts (and stops) an oscilloscope.
Exit		Closes "Oscilloscope".

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5. Impulse Response 

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5-1. Items on the Impulse response window

Field	Description
Measurement	The measurement starts with [Start] button. Though the measurement finishes automatically, you can stop it with [Stop] button.
File	[Save...] button: Saves the data measured here. -> 5-2. Save measurement data [Load...] button: Loads the data stored previously. -> 5-3. Load measurement data
Sampling Rate	Sampling frequency. 8 to 48kHz.
Conditions	[Adjustment...] button: Input & output level, microphones position, measurement time are adjusted. -> 5-4. Adjustment
Measure Time	The time duration for measuring impulse response. (The scale on horizontal axis)
Summation	The number of times that MLS signal (period) are added and averaged out. If this number becomes larger, S/N ratio is improved. But, the time duration becomes longer.
Channels	Choose stereo (= 2 channels) or monaural (= 1 channel).
Method	The MLS method and the TSP method can be used in the impulse response measurement. It can be used only by choosing one of the MLS and the TSP. TSP is the signal in which the energy of an impulse is distributed on the time axis. In the TSP method, an impulse response is calculated by generating TSP signal, acquiring the response and returning the dispersed energy.
Auto level	It is adjusted so that an output level can become the most suitable. (An output level is enlarged within the range that an input doesn't become saturated, and S/N ratio is improved.) If you turn "Auto Level" off. You can adjust sound volume (output level) at random using Windows sound volume control.
Auto Retry	Measurement will be repeated until distortion-free data can be obtained. You can release it at your option by switching on/off.
Correction	Unnecessary response of the measurement system such as microphone and speaker are removed. [Setup...] button: Sets the Inverse filter. [Cancel] button: Cancels the Inverse filter. [Save...] button: Saves new Inverse filter.  -> 5-5. Correction (inverse filter setting)
Output Wave File	The data are saved in wave file format and text file format.
Play	Clicking on this enables to listen to the impulse response sound.
Exit	"Impulse Response" program is finished.
	These buttons adjust the range of indication of impulse response.
Measurement Conditions	Various conditions of the measurement are shown. (Time, Measurement Time, Bits, Sampling Rate, Summation, Channels)

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5-2. Save Measurement Data
Clicking [Save...] button on "Impulse Response" window, the following "Save Measurement Data" window appears.
The measured data will be stored in a folder.

 

<Folder Management>
Clicking [Folder...] button on "Save Measurement Data" window, the following "Folder Management" window appears.

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5-3. Load Measurement Data

Clicking [Load...] button on "Impulse Response" window, the following dialog appears. Select the impulse response data you want to load, here.

Database of the impulse response measurement can be imported from DSSF3/RAE/RAD on other PC.

Open the shared drive on your LAN.

Open database of DSSF3.

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5-4. Adjustment

Input and output level, microphone position, measurement time are adjusted so that they can become the most suitable for the impulse response measurement.

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5-5. Correction (inverse filter setting)

[Save] the inverse filter

In this window, the inverse filter is created from the measured impulse response. Only the initial part of the response should be selected because the response of the measurement system is included in this part.

[Setup] the inverse filter

To set the filter, click the "Setup" button and select the filter. Then start the measurement. The impulse response of a room excluding the response of the measurement system can be measured. 

Back to Items on the Impulse response window

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6. Running ACF/CCF

6-1. Items on the Running ACF window

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6-2. Save Measurement Data
Clicking [Save...] button on "Running ACF" window, the following "Save Measurement Data" window appears.
The measured data will be stored in a folder.

<Folder Management>
Clicking [Folder...] button on "Save Measurement Data" window, the following "Folder Management" window appears.

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6-3. Load Measurement Data
Clicking [Load...] button on "Running ACF" window, the following dialog appears.
Select the ACF data you want to load, here.

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7. Preset

You can save the window's status and location and various settings, and you can call them in the future.

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8. Keyboard shortcut

A keyboard shortcut is a combination of keys that can be pressed to do something that you normally do with the mouse. This topic instructs how to find and use keyboard shortcuts in RA.

For example, as in the figure below,  items in the menu bar start with underbars like Window. This means that you can press Alt + W to see the window menu. The buttons on the RA's main window also have shortcuts (Signal Generator, FFT Analyzer, Oscilloscope, and so). 

Some of the buttons on the measurement window also have shortcuts. The most useful one might be the Start / Stop key. To start and stop the measurement, just press the S key. In other window, several buttons have shortcuts as well. Check the measurement window and find useful shortcuts.

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Yoshimasa Electronic Inc.

Introduction of RA  Operation Guide  Impulse response  Running ACF  Reference Manual  Appendix

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