I meant to say the DSP processing is fully working!! Not with a question mark.
Can't see an edit post option on this forum. That's a shame.
applying esp-dsp IIR biquad to pipeline or element ?
- shabtronic
- Posts: 49
- Joined: Sun Nov 03, 2019 1:33 pm
Re: applying esp-dsp IIR biquad to pipeline or element ?
Awesome you got it working - sucks about the firmware problem tho.
There is a edit option - it's a little pen next to the flag on the top right of anything you post.
Have fun!
There is a edit option - it's a little pen next to the flag on the top right of anything you post.
Have fun!
Re: applying esp-dsp IIR biquad to pipeline or element ?
fully working in Stereo !!!!
The hardware was fine , you were correct , i needed to de-interleave I2S
int16-t to float -> de-interleave -> DSP L & DSP R -> float to int16_t -> re-interleave !!!
I untangled the code from equaliser.c so its own thing and called is dsprunner.c
awesome , super happy , thanks for your tips !!
The hardware was fine , you were correct , i needed to de-interleave I2S
int16-t to float -> de-interleave -> DSP L & DSP R -> float to int16_t -> re-interleave !!!
I untangled the code from equaliser.c so its own thing and called is dsprunner.c
awesome , super happy , thanks for your tips !!
-
- Posts: 4
- Joined: Fri Jul 08, 2022 6:14 am
Re: applying esp-dsp IIR biquad to pipeline or element ?
Hi,
Hope you are doing good.
These conversation is very useful for me, based on this I have tried to implement LPF to remove noise from audio signal. But still I am getting noise in output with actual audio signal.
esp-idf version = stable release 4.4.1
Dev-Kit = https://github.com/W00ng/ESP32-S3-HMI-DevKit
My code is as following.(I am a beginner for I2S interface and audio signals)
Please suggest me some improvements if I am doing anything wrong in LPF implementation. I have tried all the steps mentioned in previous replies and implemented this code so far.
Thanks in advance.
Hope you are doing good.
These conversation is very useful for me, based on this I have tried to implement LPF to remove noise from audio signal. But still I am getting noise in output with actual audio signal.
esp-idf version = stable release 4.4.1
Dev-Kit = https://github.com/W00ng/ESP32-S3-HMI-DevKit
My code is as following.(I am a beginner for I2S interface and audio signals)
Code: Select all
[Codebox=c file=Untitled.c]
#define AUDIO_SAMPLE_RATE AUDIO_HAL_16K_SAMPLES
/* i2s_Sample_Rate * T * sizeof(uint8_t)
16bits,Mono,Record_time = T/2(s) */
#define BUF_SIZE (16000 * 20 * sizeof(uint8_t))
#define FRAME_SIZE (1600)
#define SAMPLES_NUM (1024)
static uint32_t audio_index = 0;
static uint32_t audio_total = 0;
static uint8_t *audio_buffer = NULL;
#if 1
int N = SAMPLES_NUM;
// Input test array
__attribute__((aligned(16)))
float d[SAMPLES_NUM];
// output array
__attribute__((aligned(16)))
float y[SAMPLES_NUM];
__attribute__((aligned(16)))
float y_cf[SAMPLES_NUM*2];
#endif
void audio_record_task(void *args)
{
static esp_err_t ret;
static size_t bytes_read = 0;
static size_t bytes_write = 0;
while (1)
{
if (mode == record) {
ESP_LOGI(TAG, "record start");
audio_index = 0;
while ((mode == record) && (audio_index < (BUF_SIZE - FRAME_SIZE)))
{
ret = i2s_read(I2S_NUM_0, audio_buffer + audio_index, FRAME_SIZE, &bytes_read, 100);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "[echo] i2s read failed");
abort();
}
audio_index += FRAME_SIZE;
}
if (mode == record) mode = idle;
ESP_LOGI(TAG, "record end");
}
else if (mode == play)
{
ESP_LOGI(TAG, "play start");
ESP_LOGI(TAG, "audio_index = %d", audio_index);
audio_total = audio_index; //recorder length
audio_index = 0;
esp_err_t ret = ESP_OK, ret_hpf = ESP_OK;
float coeffs_lpf[5];
float coeffs_hpf[5];
float w_lpf[5] = {0,0};
// Calculate iir filter coefficients
ret = dsps_biquad_gen_lpf_f32(coeffs_lpf, 0.1, 0.5); // freq=0.1 and qfact=0.5
if (ret != ESP_OK)
{
ESP_LOGE(TAG, "Operation error LPF = %i", ret);
return;
}
#if 1
while(audio_index < audio_total)
{
for (int i=audio_index,j=0; (i-audio_index) < SAMPLES_NUM ; i++,j++)
{
//d[j] = ((float)audio_buffer[i]/(float)32768);
d[j] = (float)audio_buffer[i];
}
// Process input signal
ret = dsps_biquad_f32(d, y, N, coeffs_lpf, w_lpf);
if (ret != ESP_OK)
{
ESP_LOGE(TAG, "Operation error biquad lpf= %i", ret);
return;
}
for (int i=audio_index, j=0 ; (i-audio_index) < SAMPLES_NUM ; i++,j++)
{
y[j] = y[j] * 0.5;
audio_buffer[i] = (int16_t)y[j];
}
audio_index += SAMPLES_NUM;
vTaskDelay((10) / portTICK_PERIOD_MS);
}
#endif
audio_index = 0;
while ((mode == play) && (audio_index < audio_total))
{
ret = i2s_write(I2S_NUM_0, audio_buffer + audio_index, FRAME_SIZE, &bytes_write, 100);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "[echo] i2s write failed");
abort();
}
audio_index += FRAME_SIZE;
}
if (mode == play) mode = idle;
ESP_LOGI(TAG, "play end");
}
else
{
vTaskDelay((100) / portTICK_PERIOD_MS);
}
}
vTaskDelete(NULL);
}
void lv_tick_task(void *arg)
{
while(1)
{
vTaskDelay((10) / portTICK_PERIOD_MS);
lv_task_handler();
}
}
void app_main(void)
{
/* Initialize I2C 400KHz */
ESP_ERROR_CHECK(bsp_i2c_init(I2C_NUM_0, 400000));
/* Init TCA9554 */
ESP_ERROR_CHECK(tca9554_init());
ext_io_t io_conf = BSP_EXT_IO_DEFAULT_CONFIG();
ext_io_t io_level = BSP_EXT_IO_DEFAULT_LEVEL();
ESP_ERROR_CHECK(tca9554_set_configuration(io_conf.val));
ESP_ERROR_CHECK(tca9554_write_output_pins(io_level.val));
/* LVGL init */
lv_init(); //内核初始化
lv_port_disp_init(); //接口初始化
lv_port_indev_init(); //输入设备初始化
// lv_port_fs_init(); //文件系统初始化
lv_port_tick_init();
es8311_codec_config(AUDIO_SAMPLE_RATE);
bsp_i2s_init(I2S_NUM_0, 16000); //config channel_format=mono
/* Allocate audio buffer */
audio_buffer = heap_caps_malloc(BUF_SIZE, MALLOC_CAP_SPIRAM);
if (NULL == audio_buffer) {
ESP_LOGE(TAG, "Failed allocate mem for audio buffer.");
return;
}
ESP_LOGI(TAG, "UI init start");
/* Init UI of example */ // ignore it for now
ui_record(); // just to start recording and play recording using display.
ESP_LOGI(TAG, "UI started");
xTaskCreate(lv_tick_task, "lv_tick_task", 4096, NULL, 1, NULL);
xTaskCreate(audio_record_task, "audio_record_task", 4096*5, NULL, 5, NULL);
}
[/Codebox]
Thanks in advance.
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