![](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/plugins\/documentor\/skins\/mint\/images\/search.png\")
\n\t\t\t\t<\/span>- Introduction<\/a><\/div><\/li>
- RTA Quick Start Guide<\/a>
<\/div><\/li>- Integrated Virtual Processing<\/a>
<\/div><\/li>- Sound Card Settings<\/a>
<\/div><\/li>- Plugin Host<\/a>
<\/div><\/li>- Analyzer Settings<\/a>
<\/div><\/li>- Generator<\/a>
<\/div><\/li>- RTA Graph Display Settings<\/a>
<\/div><\/li>- Mimo Convolver<\/a>
<\/div><\/li>- Recorder<\/a>
<\/div><\/li>- Routing<\/a>
<\/div><\/li>- RTA IR\/Spectrum viewer<\/a>
<\/div><\/li>- Channel Viewer<\/a>
<\/div><\/li>- Real Time data view<\/a>
<\/div><\/li>- RTA Settings ImportExport<\/a>
<\/div><\/li>- Microphone Calibration<\/a>
<\/div><\/li>- Traces<\/a><\/span>
<\/div>- A, B, C Weighting on Captured traces<\/a><\/div><\/li>
- Smoothing on Captured Traces<\/a>
<\/div><\/li>- Select\/ Deselect All Traces<\/a>
<\/div><\/li><\/ol><\/li>- Reboot<\/a>
<\/div><\/li>- Probe Points<\/a>
<\/div><\/li><\/ol><\/div><\/div>1.<\/span>Introduction<\/span> <\/span><\/span>
<\/div><\/h3>RTA is a multi channel Real Time Analyzer for audio signals. It provides time and frequency domain analysis tools to measure RMS\/peak levels, frequencies, THD, delays, magnitude and phase responses. A built in signal generator provides sine tones, sweeps and pulses and various noise signals. With a file player recorded signals can be analyzed.<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/11\/RTA.png\")
<\/p>\n<\/div><\/span>Was this helpful?<\/span>\n\t\t\t\t\t\t Yes <\/a><\/span> \n\t\t\t\t\t\t No <\/a><\/span>\n\t\t\t\t\t<\/div><\/div><\/div><\/div><\/div>2.<\/span>RTA Quick Start Guide<\/span> <\/span><\/span>
<\/div><\/h3>In order to set up a basic measurement following steps need to be performed:<\/p>\n
- \n
- Open the sound card settings dialog by hitting the “Advanced” button on the ribbon bar<\/li>\n
- Choose the “Sound In device” which has a microphone attached for Channel 1 + 2<\/li>\n
- Switch to the Analyzer tab<\/li>\n
- Click on the Source for CH 1 and select SoundIn1 from the context menu<\/li>\n
- Close the Settings Dialog by a click on “Done”<\/li>\n
- Hit the Start Analyzer on the ribbon bar<\/li>\n
- The RTA graph shows now the incoming microphone signal in the time domain<\/li>\n
- In order to display the spectrum of the signal open the Analyzer window by a click on the Analyzer settings button in the ribbon bar<\/li>\n
- In the Analyzer window set the Mode to Spectrum<\/li>\n<\/ul>\n
The graph shows now the spectrum of the incoming microphone signal:<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/11\/FilterLabNew1.png\")
<\/p>\n<\/p>\n
Remark: since only one channel is active, the lower graph has been minimized by dragging the middle line and moving it to the bottom of the window.<\/p>\n
In order to test RTA without a soundcard signal, the test signal generator can be connected directly to the analyzer:<\/p>\n
- \n
- In the “Analyzer Settings” window, click on “Advanced Settings”<\/li>\n
- Set CH 1 Source to Generator1<\/li>\n
- On the ribbon bar click on “Generator”<\/li>\n
- Hit the Play button<\/li>\n<\/ul>\n
The graph shows now the spectrum of a 1kHz sine signal:<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/11\/FilterLabNew2.png\")
<\/p>\n\n<\/div>
<\/span>Was this helpful?<\/span>\n\t\t\t\t\t\t Yes <\/a><\/span> \n\t\t\t\t\t\t No <\/a><\/span>\n\t\t\t\t\t<\/div><\/div><\/div><\/div><\/div>3.<\/span>Integrated Virtual Processing<\/span> <\/span><\/span>
<\/div><\/h3>Integrated Virtual Processing can be started by clicking the “Integrated Virtual Processing” button in the ribbon bar.<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2021\/07\/RTA_01.png\")
<\/p>\nAt any given time either of IVP\/RTA or MM-IR is allowed to be opened.<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2021\/07\/RTA_02.png\")
<\/p>\nIntegrated Virtual Processing has 4 buttons<\/p>\n
- \n
- Generator- used to start\/stop generator. This is a shortcut to existing generator start\/stop<\/li>\n
- Plugin Host-used to start\/stop\u00a0Plugin Host<\/li>\n
- Mimo Convolver – used to start\/ stop Convolver<\/li>\n
- Analyzer- used to start\/ stop analyzer.<\/li>\n<\/ul>\n<\/div><\/span>Was this helpful?<\/span>\n\t\t\t\t\t\t Yes <\/a><\/span> \n\t\t\t\t\t\t No <\/a><\/span>\n\t\t\t\t\t<\/div><\/div><\/div><\/div><\/div>
4.<\/span>Sound Card Settings<\/span> <\/span><\/span>
<\/div><\/h3>The Sound Card Settings dialog can be either accessed through the Settings button on the ribbon bar or via the Channels window. One can select the audio driver (Host API), the sample rate and the block length of the audio processing.<\/p>\n
RTA supports two Host API\u2019s:<\/p>\n
- \n
- MME:<\/span> This is the standard windows audio driver. It allows operation of multiple audio devices at the same time. Sample rates are handled by the operating system. RTA can be set to any sample rate. If the sample rate of the physical audio device is different the OS takes care of the sample rate conversion. This mode is recommended if multiple devices are running at the same time, e.g. measuring with an USB microphone while playing back generator signals with an internal sound card. It is recommended to keep the block length at the maximum value of 4096 and the sample rate at 44.1kHz or 48kHz.<\/li>\n
- ASIO:<\/span> This driver is being used with multi-channel sound cards. It enables low latencies and ensures that all input and output channels are in sync. Depending on the latency requirements of the audio signal processing provided by a loaded plugin (future feature) the block length can be reduce down to 64 samples. The RTA sample rate setting has to be equal to the\u00a0audio device driver<\/span> sample rate.<\/li>\n<\/ul>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/11\/SoundCardSettings.png\")
<\/p>\nOnce a Host API has been selected the Sound In and Sound Out devices have to be selected. If no device has been selected RTA runs in a silent mode. This can be used to check the generator modes or to analyze a prerecorded measurement provided by a .wav file.<\/p>\n
All devices are provided as two channel devices. The Channels column in the Streams area show to which channel pair a Sound In or Sound Out device is mapped to. These channel pairs will show up at the analyzer and routing settings as SoundIn1..16 and SoundOut1..16 channels. These channels can be selected from contect menu in order to connect sound card channels to RTA processing blocks.<\/p>\n
<\/p>\n
In the example above the mapping is configured as follows:<\/p>\n
- \n
- SoundIn1, SoundIn2: Analog (1 + 2)<\/li>\n
- SoundIn3, SoundIn4: Analog (3 + 4)<\/li>\n
- SoundIn5, SoundIn6: Analog (5 + 6)<\/li>\n
- SoundOut1, SoundOut2: Analog (7 + 8)<\/li>\n<\/ul>\n
\u00a0Device has to be reconnected if Sample Rate \/ Block Length\/ Host API is modified<\/p>\n
ASIO sound card is preferred over Windows drivers. Use blocklength greater than 1024 while using Windows drivers to avoid noise distortion effect which is a limitation of Windows driver (even seen in audio mulch)<\/p>\n<\/div>
<\/span>Was this helpful?<\/span>\n\t\t\t\t\t\t Yes <\/a><\/span> \n\t\t\t\t\t\t No <\/a><\/span>\n\t\t\t\t\t<\/div><\/div><\/div><\/div><\/div>5.<\/span>Plugin Host<\/span> <\/span><\/span>
<\/div><\/h3>Overview<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2021\/05\/Block-diagram-1.png\")
<\/p>\nThe Plugin Host is a host for virtual amp dll. The Plugin Host supports up to 3 instances of plugins (virtualAmp.dll in 64 bit), which are executed in series. The block sizes and sample rate will be defined by the sound card settings and used for all plugins. The plugin needs to handle the block size conversion internally in case it is not matching the block size of the device\/instance. A sample rate conversion is currently not supported by the virtual Amp and will cause a error message and stop the processing.<\/p>\n
Configure plugin host<\/p>\n
Open RTA<\/em>-> Settings<\/em>-> Plugins<\/em><\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2021\/05\/PluginHostSettings-1.png\")
<\/p>\nClick Browse\u00a0<\/em>to select the xAF library<\/p>\n
Set Port number in the port number textbox<\/p>\n
If Bypass <\/em>is selected, then input is fed to the next plugin\/output without processing<\/p>\n
On click of Apply, <\/em>updated no. of inputs, no. of outputs and plugin type appears based on the sent signal flow.<\/p>\n
On click of\u00a0Reset\u00a0<\/em>all the values of particular row will be set to default values<\/p>\n
Similar settings can be applied to all 3 plugins<\/p>\n
Switch to Routing\u00a0<\/em>tab<\/p>\n
Set inputs to Plugin Host (Eg:Generator1 and Generator2)<\/p>\n
Set inputs to SoundOut in order to route the PluginHost output channels to the sound card outputs<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2021\/05\/RoutingSoutOut-1.png\")
<\/p>\nOptional<\/span>: Switch to Analyzer<\/em> tab, to select plugin host output as channel source if\u00a0 output of PluginHost shall be displayed in RTA.<\/p>\n
Set Channel source (Eg:Generator1, Generator2, PluginHost1, PluginHost2) to display in chart<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2021\/05\/Analyzer-1.png\")
<\/p>\nClick Done,<\/em> once settings are updated<\/p>\n
By default (no flash file available next to the virtualAmp.dll), number of in-\/outputs in plugin host is 2<\/p>\n
Default Port Number starts from 25001<\/p>\n
Connect to device through Plugin Host<\/p>\n
Click Plugin Host<\/em><\/p>\n
\u00a0
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2021\/05\/RTA_03.png\")
<\/p>\nSwitch to SFD window, configure signal flow. Click on Send Signal Flow<\/em><\/p>\n
A pop-up appear which asks to reboot device<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2021\/05\/Reboot-1.png\")
<\/p>\nClick Reboot<\/em><\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2021\/05\/RTA_04.png\")
<\/p>\nGo Device Designer<\/strong> tab.<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2021\/05\/RTA_05.png\")
<\/p>\nClick Connect Device <\/em>to connect to device.<\/p>\n
If AmpSrv cannot establish a connection, close AmpSrv and retry<\/p>\n
User can now do Tuning and see the graph in RTA.<\/p>\n
Set the graph using Channels window in RTA<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2021\/05\/Channels-1.png\")
<\/p>\n<\/div><\/span>Was this helpful?<\/span>\n\t\t\t\t\t\t Yes <\/a><\/span> \n\t\t\t\t\t\t No <\/a><\/span>\n\t\t\t\t\t<\/div><\/div><\/div><\/div><\/div>6.<\/span>Analyzer Settings<\/span> <\/span><\/span>
<\/div><\/h3>When clicking on the Analyzer settings button in the ribbon bar the analyzer window opens:<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/11\/01-1.png\")
<\/p>\nWith “Mode” the analyzer mode can be selected.<\/p>\n
Following modes are available:<\/p>\n
- \n
- Time<\/span>: Displays source channels in the time domain (one block of 4096 samples)<\/li>\n
- Spectrum<\/span>: Displays the spectrum of the source channels<\/li>\n
- Multiplexer<\/span>: Switches the RTA into an multiplexer mode where multiple source channels are combined to two average channels<\/li>\n
- Delay :<\/strong><\/span> Displays source channels in the time domain. The delay measurement is done by cross correlation between a reference channel and a channel which contains the reference signal which went through a certain path (e.g. amp – speaker – microphone). From the position of the maximum within the correlation result the delay can be calculated. Calculated Delay value is displayed in Channel viewer in Delay column.<\/li>\n
- Phase : <\/strong><\/span>Displays the magnitude and phase of the source channels. Phase can be wrapped and unwrapped using Graph Settings in settings window. The phase measurement is done by a dual channel FFT analysis.<\/li>\n
- THD : <\/span>Displays the magnitude and THD of the source channels. This is an Impulse response measurement with exponential sine sweep. When this analyzer mode is selected ‘ExpSweep’ Generator mode is set and user not allowed to change to other modes. ‘Play’ button is disabled in Generator view and with ‘Single’ button he can generate ‘ExpSweep’ once .<\/li>\n<\/ul>\n
The “Banding” can be adjusted in Spectrum or Multiplexer mode. With banding Off all calculated frequency bins of the spectrum are displayed. In this setting a very detailed analysis is possible. The only drawback is that the higher the FFT size, the more data have to be calculated and displayed, and hence more CPU power is being used. When banding is switched on, frequency bins are combined to groups. The width of such a group can be set by fractions of an octave, e.g. Oct12 i.e, one band has the width of a 12th of one octave.<\/p>\n
Depending on the test signal, smoothing of the spectrum over time is required.<\/p>\n
This can be set by the “Multiplexer” mode:<\/p>\n
- \n
- Fast<\/span>: Small smoothing time constant and hence only a small amount of smoothing (time constant 125 ms)<\/li>\n
- Slow<\/span>: Large smoothing time constant and hence significant smoothing (time constant 1000 ms)<\/li>\n
- Custom<\/span>: Custom smoothing time constant and a textbox with ms which takes input<\/li>\n<\/ul>\n
Detailed settings can be done with the “Analyzer Settings” Dialog:<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/11\/Analyzer03.png\")
<\/p>\n<\/p>\n
With the channels list, following adjustments can be made:<\/p>\n
- \n
- Source<\/span>: This defines the input of a certain analyzer channel. By clicking on the control (default: “None” for no input), a context menu pops up from which the desired source can be chosen.<\/li>\n
- Name<\/span>: here the name of an analyzer channel can be set. This name appears in the channel viewer and will be set as a default name when storing measurements as traces.<\/li>\n
- Calib<\/span>: when a channel is being calibrated for a certain microphone the determined value appears here. It can also be overwritten by entering a desired value. The unit is \u201edB\u201c; the analyzer input stream will be scaled by this value.<\/li>\n
- Unit<\/span>: here the unit of the analyzer source can be set. This unit appears later in the channel viewer.<\/li>\n
- Name<\/span>: here the name of an analyzer channel can be set. This name appears in the channel viewer and will be set as a default name when storing measurements as traces.<\/li>\n
- Slow<\/span>: Large smoothing time constant and hence significant smoothing (time constant 1000 ms)<\/li>\n
- Spectrum<\/span>: Displays the spectrum of the source channels<\/li>\n
- Time<\/span>: Displays source channels in the time domain (one block of 4096 samples)<\/li>\n
- ASIO:<\/span> This driver is being used with multi-channel sound cards. It enables low latencies and ensures that all input and output channels are in sync. Depending on the latency requirements of the audio signal processing provided by a loaded plugin (future feature) the block length can be reduce down to 64 samples. The RTA sample rate setting has to be equal to the\u00a0audio device driver<\/span> sample rate.<\/li>\n<\/ul>\n
- MME:<\/span> This is the standard windows audio driver. It allows operation of multiple audio devices at the same time. Sample rates are handled by the operating system. RTA can be set to any sample rate. If the sample rate of the physical audio device is different the OS takes care of the sample rate conversion. This mode is recommended if multiple devices are running at the same time, e.g. measuring with an USB microphone while playing back generator signals with an internal sound card. It is recommended to keep the block length at the maximum value of 4096 and the sample rate at 44.1kHz or 48kHz.<\/li>\n
- Smoothing on Captured Traces<\/a>
- RTA Quick Start Guide<\/a>