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Smart amp
Smart Amp- Speaker Characterization Process
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Smart Amp- Speaker Characterization Process
[INTRO MUSIC] Welcome to Texas Instruments. This video will provide a walkthrough of the speaker characterization process using PurePath Console 3 or PPC3. For related video about PPC3 overview installation, please refer to the following sites. Speaker characterization is a required step to fully utilize the Smart Amp Protection algorithm designed by TI to improve next-gen audio devices. Different from a conventional algorithm, which reduces audio volume to avoid speaker damage, TI's Smart Amp Protection algorithm protects speakers through real-time excursion and temperature adjustment while maintaining optimized audio outputs. Before beginning the speaker characterization process, select Connect to establish communication with the EVM. In order to start the Characterization Wizard, please verify that your device is also connected to the Learning Board 2. Select the Characterization panel on the PPC3 Device Homepage to begin the process. For characterization, you will need the following hardware-- the EVM, a testing microphone, the speaker to be characterized, LC filter, and the Learning Board 2. Verify that the hardware testing accessories are set up correctly as shown on the page. For more information about the different audio amplifier setups, please visit the document below. During the characterization process, you can return to a previous step to review or retest at any time just by selecting the Back arrow or the Tab ribbon located on the top of the window. Select Start Checks to begin the hardware checks or skip to the next step. Once the check is complete, select Done to proceed to the next step. Choose the speaker type. And place the test microphone within 10 centimeter from the speaker. Select Start IV Measurement to proceed to the next step. [CHIRP TONE] During this step, a test chirp tone will be played to model the impedance and the frequency response of the speaker. After reviewing the speaker model, enter the diaphragm area or the surround diameter in the Speaker Details page. These values can be found on the datasheet or manually measured. Select Next to proceed to the next step. Enter the force factor in unit Tesla meter. This can be obtained from the speaker manufacturer or measured using a laser. Once entered, proceed to the next step. Review the adjusted speaker model. And verify the resonance frequency and low frequency impedance are within the tolerance of the values indicated on the speaker datasheet. Enter the excursion limit and the thermal limit of the speaker. These values can commonly be found on the speaker datasheet under Xmax and Tmax or obtained directly from the speaker manufacturer. Please carefully verify these values to ensure the reliability of the Smart Amp Protection algorithm. Note, the thermal limit is defined as the difference in the degrees Celsius from the maximum temperature limit to the ambient temperature. Lastly, you can adjust the margin of the limit by selecting the blue icon. Select Accept to confirm the setting. And proceed to the next step. Enter the temperature coefficient of the speaker coil material. The default value is the coefficient of copper. Next, enter the excitation frequency to test the speaker. It is defaulted to 16 kilohertz. However, a lower frequency may result in a more accurate model. During thermal modeling, depending on speaker characteristics, you may expect some oscillatory behavior or experience issues with the speaker unable to heat up correctly. In such cases, you may try adjusting the controller parameters, such as controller gain, to resolve the issues. For more information about each parameter, please refer to the application report or visit the E2E Forum. Note, during this step, several cycles of a loud testing tone will be played to heat up the speaker. Review the temperature model. It should resemble the example model shown below. Repeat the test if necessary. Select Accept to review the result. The characterization process is now complete. You can review all of the measurements and models on this page. After saving the characterization data, you're ready for the next step, Device Features and Tuning. For more information, please visit the following links. Thank you for watching.
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Description
August 20, 2020
This video provides a walkthrough of the speaker characterization process using TAS2563 PPC3.
Additional information
For more information about the different audio amplifier setups
To view TAS2563
04:45
1
Smart Amp- Purepath Console 3 Overview
05:18
2
Smart Amp- Speaker Characterization Process
08:31
3
Smart Amp- Tuning Overview
07:38
4
Smart Amp - Device Control Overview
04:44
5
Smart Amp - End System Integration
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