bit_order:LSB(I2S也要是LSB,Clock Polarity要设置为high) endianness:BE(反转它) high_pass_tap:不用改,默认的是频响曲线挺好的了 抽取因子:自己看着选吧,想要高信噪比就选高抽取因子 output_sample_number:输出PCM的数量 PDM_Filter(PDM_input,pcm_output,&PDM1_filter_handler) pcm_output就是转换后的...
静态参数 说明 备注 指定输入的位序 (MSB或LSB) 指定是否需要字节反转 PDM_FILTER_BIT_ORDER_LSB (0x0000) PDM_FILTER_BIT_ORDER_MSB (0x0001) PDM_FILTER_ENDIANNESS_LE (0x0000) PDM_FILTER_ENDIANNESS_BE (0x0001) 指定高通滤波器抽头值 指定输入PDM流中的通道数 高通滤波器的...
PDM_FilterHandler.bit_order = PDM_FILTER_BIT_ORDER_MSB; PDM_FilterHandler.endianness = PDM_FILTER_ENDIANNESS_BE; PDM_FilterHandler.high_pass_tap = 2104533974; PDM_FilterHandler.out_ptr_channels = 1; PDM_FilterHandler.in_ptr_channels = 1; PDM_FilterConfig.output_samples_number = 16; PDM_Fi...
Both these filters can be enabled/disabled and configured (cut-off frequencies) by using the filter initialization function. In stereo configuration, if two microphones are sharing one data line and the PDM data is interleaved bit per bit, a software de-interleaving step...
signal, fS = 48 kHz, PDMCLKx = 64 × fS, 32-bit audio data, BCLK = 256 × fS, TDM slave mode, PLL on, and linear phase decimation filter (unless otherwise noted); all performance measurements are done with a 20-kHz, low-pass filter and an A-weighted filter (unless otherwise ...
(triggered, by offset or filter) Fitting Dimensions W x H x D DIN rail 35 × 7.5/15 EN 50022 Rail housing DIN 43880 EY-RC 504:105 (6 HP) × 90 × 58 mm EY-RC 505:210 (12 HP) × 90 × 58 mm Type of protection Energy class5) Environment class Protection class EMC Directive ...
Static parameters Description Comment Specifies the bit order for input (MSB or LSB) Specifies if byte inversion is required Specifies the HP filter tap value PDM_FILTER_BIT_ORDER_LSB (0x0000) PDM_FILTER_BIT_ORDER_MSB (0x0001) PDM_FILTER_ENDIANNESS_LE (0x0000) PDM_FILTER_ENDIANNESS_BE (0x...
● Filter: is the structure containing all the filter parameters specified by the user using the PDM_Filter_Init function. There are four different implementations of this function depending on the decimation factor (64 or 80) and on the LSB or MSB representation of the input buf...
● Filter: is the structure containing all the filter parameters specified by the user using the PDM_Filter_Init function. There are four different implementations of this function depending on the decimation factor (64 or 80) and on the LSB or MSB representation of the input buffer...