The signal passes through the bandpass filter and the Lamp glows.Design procedure of a Finite Duration Impulse Response(FIR) bandpass Digital Filter which satisfies a set of prescribed specifications, is described in this article where windowing method in conjunction with the Kaiser window is used for the designing procedure. Observe the output of the Spectrum Analyzer Original, Time Scope, and Spectrum Analyzer Filtered blocks. Set the frequency of the Sine Wave (DSP System Toolbox) to any frequency between 3000 Hz and 5500 Hz, for example, 4000 Hz. No output is visible is in second port of the Time Scope block. The signal does not pass through the bandpass filter. Set the frequency of the Sine Wave (DSP System Toolbox) to any frequency above 5500 Hz, for example, 6500 Hz. No output is visible in second port of the Time Scope block. Set the frequency of the Sine Wave (DSP System Toolbox) to value below 3000 Hz, for example, 2400 Hz. Change the frequency of the Sine Wave by moving the Slider and observe the Spectrum Analyzer and Time Scope.Ī. Select the pace at which the model runs by using the slider or entering the pace in the Simulation time per wall clock second field.Ħ. When you select this option, the specified pace automatically applies to the simulation.Ĥ. In the Simulation Pacing Options dialog, select Enable pacing to slow down simulation. On the Simulation tab of the Simulink model, select Run > Simulation Pacing.ģ. Position the Manual Switch in the Simulation Sources area to receive the simulation output from the Sine Wave (DSP System Toolbox) block.Ģ. The lamp glows if the relative magnitude of the filtered signal is greater than 0.75, which occurs for signals with a frequency lying in the bandpass filter frequency range of the filter. The Lamp is also connected to the input received from the LED. The output of the Subsystem block in the Algorithm area is an input to the LED block in the Raspberry Pi Actuators and Outputs area. In the Display and Visualization area, you can view the original signal and the filtered signal on the time scope and spectrum analyzer. The Magnitude Response (dB) section shows the filter corresponding to the above specifications. The Current Filter Information section shows the details for the structure, order, stability, and source for the designed filter. In the Magnitude Specifications section, set these parameters. In the Frequency Specifications section, set these parameters.ģ. In the Response section, select Bandpass.Ģ. This filter has an order of 260 and allows a range of frequencies to pass above 3500 Hz and below 5500 Hz.Ĭonfigure these parameters in the Digital Filter Design (DSP System Toolbox) Block Parameters dialog box.ġ. The default position of the Manual Switch is on the sine wave data received from the Simulation Sources area.ĭesign a bandpass filter using the Digital Filter Design (DSP System Toolbox) block. From the listAudioDevices function, you can select the parameter value specified in the Channels field. Enter the Number of Channel (C) supported for the audio device. From the listAudioDevices function, you can select the parameter value specified in the BitDepth field.ģ. Specify the data type in which the audio device reads or sends data by selecting a value from the Device Bit Depth drop-down. The plug plugin converts the rate, format, and channel specified in the ALSA Audio Capture Block Parameters dialog box and makes them compatible with the output of the audio device.Ģ. For example, if the Device field is 2,0, enter 'plughw:2,0'.
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