7.1.10 Generation of the separation transfer function file

• The separation transfer function file is a file used in the GHDSS module.

• The separation transfer function file is generated from ImpulseResponse-ListFile or TSP-ListFile, and from MICARY-LocationFile.

Figure 7.15: Generation of the separation transfer function file

1. Click the Separation button on the working screen.

2. Input the parameters into the parameter input screen on the left side.

   Overview of setting items　

   • Input Type
     Select impulse response or TSP response or geometry calculation.
     Impulse Response: Select this option if you obtain the transfer function from the recorded impulse response.
     TSP Response: Select this option if you obtain the transfer function from the recorded TSP signal.
     Calculation: Select this option if you obtain the transfer function in simulations.
     

   • MicArray File
     Filename of microphone location setting file.
     Specify the file generated in section 7.1.7.

   • TSP/IR ListFile
     Specify the TSP response list file (see 7.1.6) or the Impulse response list file(see 7.1.5).

   • Sampling Rate [Hz]
     Sampling frequency of the transfer function.

   • FFT Length [sample]
     The number of bins in the discrete frequency expression of the transfer function.

   • TSP Length [sample]
     Specify the length of one recorded TSP signal, or the impulse response length.

   • Normalization Method
     Specify one of the following normalization axis:

     • Non Normalization

     • Normalization of Microphone Channel Axis

     • Normalization of Sound Source Axis

     • Normalization of Frequency Axis

3. Pushing the Create button on the bottom of the screen generates the separation transfer function file and displays the contents of the file on the right side.

4. Check by graphic representation
   Graphic representation can be displayed for the item with the PLOT on the output screen.
   If you double-click the Plot, graphic representation appears and you can check the results.
   (See Figure 7.16)

5. Graphic representation of Mic Position
   Double-click the Plot next to the Mic position.

   

   Figure 7.16: Graphic representation of the Mic Position

   
   

6. Graphic representation of the Source Location
   Double-click the Plot next to the Source Location.

   

   Figure 7.17: Graphical representation of the Source Location

   
   

7. Graphic representation of the Transfer function
   If you double-click the Plot next to the Transfer function, graph representation setting screen (see Figure 7.18) appears.
   Set the values using Overview of setting items below as a guide. Clicking the bottom-right Plot button displays the graph.
   (e.g. see Figure 7.20)

   

   Figure 7.18: Transfer Function setting screen (Display Target tab)

   

   Figure 7.19: Transfer Function setting screen (Display Type tab)

   Overview of setting items

   • Target data
     The type of graph to be displayed, choose one of the following three types:

     • Transfer function

     • Inverse Fourier Transform (Inverse FFT of Transfer function)

   • X-axis label
     Choose the X-axis label from among the following labels.

     • Frequency (When the target data is "Transfer function")

     • Time (When the target data is "Inverse Fourier Transform")

     • Sound Source Number

     • Num of Mic

     Display range of X-axis can be specified by Min and Max.
     If every value is to be displayed, these items need not be specified.
     Min : Minimum value to be displayed on X-axis
     Max : Maximum value to be displayed on X-axis

   • Y-axis label
     Choose the Y-axis label from among the following labels.

     • Frequency (When the target data is "Transfer function")

     • Time (When the target data is "Inverse Fourier Transform")

     • Sound Source Number

     • Num of Mic

     Display range of Y-axis can be specified by Min and Max.
     If every value is to be displayed, these item need not be specified.
     Min : Minimum value to be displayed on Y-axis
     Max : Maximum value to be displayed on Y-axis

   • Z-axis label
     Choose the Z-axis label from among the following labels.

     • Amplitude

     • dB

     • Phase

     Display range of Z-axis can be specified by Min and Max.
     If every value is to be displayed, these item need not be specified.
     Min : Minimum value to be displayed on Z-axis
     Max : Maximum value to be displayed on Z-axis

   
   

   ■ Display Type tab

   • Mic(or SRC or FREQ) index for display
     Select the number of microphone or source or frequency to be displayed.
     

   • Plot Parameter
     Select the style of the graph to be displayed.
     

     • Plot type (undefined, dots, points, lines, lines_points)

     • Surface (undefined, line, mesh)

     • Color Map (undefined, pm3d, pm3d map, pm3d at b)

   

   Figure 7.20: Graphical representation of the Transfer Function

8. To save the created file, use Save button on the bottom of screen.