C++ (Cpp) PDM_Filter_Init Beispiele

Beispiel #1

Datei: sample_proc.c Projekt: Superkazuya/ASR_Project

void filter_init()
{
  pdm.LP_HZ = 8000;
  pdm.HP_HZ = 10;
  pdm.Fs = SAMPLING_FREQZ;
  pdm.Out_MicChannels = 1;
  pdm.In_MicChannels = 1;
  PDM_Filter_Init(&pdm);
}

Beispiel #2

Datei: stm32f401_discovery_audio.c Projekt: erdincay/stm32f401-nucleo-basic-template

/**
  * @brief  Initialize the PDM library.
  * @param  AudioFreq: Audio sampling frequency
  * @param  ChnlNbr: Number of audio channels (1: mono; 2: stereo)
  * @retval None
  */
static void PDMDecoder_Init(uint32_t AudioFreq, uint32_t ChnlNbr)
{ 
  uint32_t i = 0;
  
  /* Enable CRC peripheral to unlock the PDM library */
  __CRC_CLK_ENABLE();
  
  for(i = 0; i < ChnlNbr; i++)
  {
    /* Filter LP & HP Init */
    Filter[i].LP_HZ = AudioFreq / 2;
    Filter[i].HP_HZ = 10;
    Filter[i].Fs = AudioFreq;
    Filter[i].Out_MicChannels = ChnlNbr;
    Filter[i].In_MicChannels = ChnlNbr; 
    PDM_Filter_Init((PDMFilter_InitStruct *)&Filter[i]);
  }  
}

Beispiel #3

Datei: stm32f4_discovery_audio_mic.c Projekt: restofsun/codec2_m4f

/**
  * @brief  Initialize wave recording
  * @param  AudioFreq: Sampling frequency
  *         BitRes: Audio recording Samples format (from 8 to 16 bits)
  *         ChnlNbr: Number of input microphone channel
  * @retval None
  */
uint32_t MicListenerInit(uint32_t AudioFreq, uint32_t BitRes, uint32_t ChnlNbr)
{
  /* Check if the interface is already initialized */
  if (AudioMicInited)
  {
    /* No need for initialization */
    return 0;
  }
  else
  {

#ifdef USE_ST_FILTER
    /* Filter LP & HP Init */
    Filter.LP_HZ = 4000;
    Filter.HP_HZ = 250;
    Filter.Fs = 16000;
    Filter.Out_MicChannels = 1;
    Filter.In_MicChannels = 1;

    PDM_Filter_Init((PDMFilter_InitStruct *)&Filter);
#else
    pdm_fir_flt_init(&Filter2);
#endif
    /* Configure the GPIOs */
    MicListener_GPIO_Init();

    /* Configure the interrupts (for timer) */
    MicListener_NVIC_Init();

    /* Configure the SPI */
    MicListener_SPI_Init(AudioFreq);

    /* Set the local parameters */
    AudioRecBitRes = BitRes;
    AudioRecChnlNbr = ChnlNbr;

    /* Set state of the audio recorder to initialized */
    AudioMicInited = 1;

    /* Return 0 if all operations are OK */
    return 0;
  }
}

Beispiel #4

Datei: microphone.c Projekt: timbrom/lightshow

/**
  * @brief  Initialize wave recording
  * @param  AudioFreq: Sampling frequency
  *         BitRes: Audio recording Samples format (from 8 to 16 bits)
  *         ChnlNbr: Number of input microphone channel
  * @retval None
  */
uint32_t WaveRecorderInit()
{ 
  /* Check if the interface is already initialized */
  if (AudioRecInited)
  {
    /* No need for initialization */
    return 0;
  }
  else
  {
    sample_collected_fp = NULL;

    /* Enable CRC module */
    RCC->AHB1ENR |= RCC_AHB1ENR_CRCEN;
    
    /* Filter LP & HP Init */
    Filter.LP_HZ = 8000;
    Filter.HP_HZ = 10;
    Filter.Fs = 16000;
    Filter.Out_MicChannels = 1;
    Filter.In_MicChannels = 1;
    
    PDM_Filter_Init((PDMFilter_InitStruct *)&Filter);
    
    /* Configure the GPIOs */
    WaveRecorder_GPIO_Init();
    
    /* Configure the interrupts (for timer) */
    WaveRecorder_NVIC_Init();
    
    /* Configure the SPI */
    WaveRecorder_SPI_Init();
    
    /* Set the local parameters */
    
    /* Set state of the audio recorder to initialized */
    AudioRecInited = 1;
    
    /* Return 0 if all operations are OK */
    return 0;
  }  
}

Beispiel #5

Datei: stm32f401_discovery_audio.c Projekt: ClintHaerinck/STM32Cube_FW_F4

/**
  * @brief  Initialize the PDM library.
  * @param  AudioFreq: Audio sampling frequency
  * @param  ChnlNbr: Number of audio channels (1: mono; 2: stereo)
  * @retval None
  */
static void PDMDecoder_Init(uint32_t AudioFreq, uint32_t ChnlNbr)
{ 
  uint32_t i = 0;
  
  /* Enable CRC peripheral to unlock the PDM library */
  __CRC_CLK_ENABLE();
  
  for(i = 0; i < ChnlNbr; i++)
  {
    /* Filter LP & HP Init */
    Filter[i].LP_HZ = AudioFreq / 2;
    Filter[i].HP_HZ = 10;
    Filter[i].Fs = AudioFreq;
		/* On STM32F401-Discovery a single microphone is mounted, samples are duplicated
       to make stereo audio streams */
    Filter[i].Out_MicChannels = 2;
    Filter[i].In_MicChannels = ChnlNbr; 
    PDM_Filter_Init((PDMFilter_InitStruct *)&Filter[i]);
  }  
}