The EQ provides the flexibility for compensating the imperfect frequency responses of the selected microphone and speaker. This function provides a 5-band customized filter for both MIC and speaker paths.
The following figure illustrates the interface to configure equalizers for both speaker and microphone paths using buttons.
Custom EQ – MIC (for Microphone path)
Custom EQ – SPK (for Speaker path)
Note: The custom EQs with mSBC is configured for the HFP 1.6, supporting the wideband (16 kHz sampling rate) speech features.
Figure 4-7. EQ Configuration Interface for Speaker and MIC Paths in SCO or Speech Mode
The following figure illustrates how to configure the equalizer functions.Figure 4-8. Configuring the Equalizer Functions
The user must enter the required frequencies and gain/attenuations in the columns. The Quality (Q) factor columns are to configure the cutoff frequencies of each equalizer band. Therefore, if the value of Q is smaller, the wider the bandpass cutoff frequency (see the preceding figure). The M+ and MR buttons function as the calculator’s M+ and MR. The purpose of these two buttons are to record the frequency responses for easy analysis comparison.
Click the Save button to save the designed frequency response, and the system automatically stores the current EQ’s configuration into a file.
Click the Load Response button to restore the frequency response and EQ configurations from the previous design.
The section “Stage” configures the number of bands of the 1-order IIR filter. The fewer stages, then lower the MIPS and power consumption.
The following figure illustrates the functions of the Q factor.Figure 4-9. Q Factor Function
The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.
