How to achieve smart product speaker amplitude and speaker temperature protection

With the ongoing trend of slim and lightweight smartphones, speaker size is becoming increasingly constrained, making it challenging to enhance the performance of external speakers. At the same time, audio quality has become a key selling point for mobile devices. High volume and superior sound quality are now essential features in the market. In this context, SmartPA has gained significant popularity due to its ability to balance these conflicting requirements. SmartPA utilizes intelligent protection algorithms to safeguard speaker amplitude and temperature, allowing for maximum utilization of the speaker’s potential. This enables high volume and excellent sound quality even within limited speaker space. TI offers several solutions, including TAS2557, TAS2560, and TAS2559. For mono applications, TAS2557 with built-in DSP and TAS2560 without DSP are commonly used. The DSP-based solution allows the protection algorithm to run directly on the chip, making implementation straightforward. However, when using a non-DSP solution like TAS2560, the algorithm must run on the platform side. This article focuses specifically on how to implement TAS2560 on the Qualcomm platform. The first step involves understanding the project's specific requirements. Key considerations include: - Is the project mono or stereo? - What is the number of I2S channels and their format? - What is the maximum sampling rate? Typically 48kHz or 44.1kHz. - Where are the algorithm-related parameters stored? Are they using a bin file or Qualcomm's default acdb file? - How many usage scenarios will be supported with SmartPA? - Factory verification: Is there a standard test procedure and source? Are there additional requirements beyond recalibration? The second step is integrating the TAS2560 driver. TI provides reference code that simplifies the process. The goal is to ensure normal speaker output. At this stage, testing electrical characteristics such as THD+N and noise floor can confirm whether the audio channel is functioning correctly. Important notes include: - Confirm the I2S signal format from the platform, ideally verified with an oscilloscope. - Ensure the PLL settings on the TAS2560 are correct, as improper settings may cause noise issues. - Understand the DC impedance range of the speaker within the driver. The third step involves porting the algorithm to the Qualcomm platform. This includes integrating the SmartPA algorithm library and framework into the ADSP section of the platform. Typically, ADSP is integrated directly into the main platform. Key steps include: - Enabling the I2S TX port on the platform side and ensuring the feedback path from the TAS2560 is correct. - Verifying the IV signal feedback. - Implementing code on both the DSP and AP sides, referencing available documentation. - Installing PPC3 and ensuring communication between PPC3 and the device. PPC3 is a graphical tool provided by TI for configuration and monitoring. - Writing factory check code, ensuring the algorithm is disabled during testing. - Conducting algorithm verification, which TI also provides a standard process for. The fourth step is modeling and tuning. This involves: - Gathering speaker parameters such as Xmax, Tmax, Tcoef, BL, and Sd. - Preparing an apertured horn and modeling it in PPC3. - A rough adjustment made by the tuning engineer. - Further fine-tuning based on the complete system and horn after final confirmation. This detailed process ensures optimal performance and reliability of the SmartPA solution in real-world applications.

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