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TTS Speech Synthesis Model

:link_to_translation:zh_CN:[中文]

Espressif TTS speech synthesis model is a lightweight speech synthesis system designed for embedded systems, with the following main features:

  • Currently Only supports Chinese language
  • Input text is encoded in UTF-8
  • Streaming output, which reduces latency
  • Polyphonic pronunciation
  • Adjustable output speech rate
  • Digital broadcasting optimization
  • Customized sound set (coming soon)

Overview

Using a concatenative method, the current version of TTS includes the following components:

  • Parser: converts Chinese text (encoded in UTF-8) to phonemes.
  • Synthesizer: generates wave raw data from the phonemes provided by the parser and the sound set. Default output format: mono, 16 bit @ 16000 Hz.

Workflow:

Examples

  • :project_file:`esp-tts/samples/xiaoxin_speed1.wav` (voice=xiaoxin, speed=1): 欢迎使用乐鑫语音合成，支付宝收款 72.1 元，微信收款 643.12 元，扫码收款 5489.54 元
  • :project_file:`esp-tts/samples/S2_xiaole_speed2.wav` (voice=xiaole, speed=2): 支付宝收款 1111.11 元

Programming Procedures

#include "esp_tts.h"
#include "esp_tts_voice_female.h"
#include "esp_partition.h"

/*** 1. create esp tts handle  ***/


// initial voice set from separate voice data partition

const esp_partition_t* part=esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_DATA_FAT, "voice_data");
if (part==0) printf("Couldn't find voice data partition!\n");
spi_flash_mmap_handle_t mmap;
uint16_t* voicedata;
esp_err_t err=esp_partition_mmap(part, 0, part->size, SPI_FLASH_MMAP_DATA, (const void**)&voicedata, &mmap);
esp_tts_voice_t *voice=esp_tts_voice_set_init(&esp_tts_voice_template, voicedata);

// 2. parse text and synthesis wave data
char *text="欢迎使用乐鑫语音合成";
if (esp_tts_parse_chinese(tts_handle, text)) {  // parse text into pinyin list
    int len[1]={0};
    do {
        short *data=esp_tts_stream_play(tts_handle, len, 4); // streaming synthesis
        i2s_audio_play(data, len[0]*2, portMAX_DELAY);  // i2s output
    } while(len[0]>0);
    i2s_zero_dma_buffer(0);
}

See :project_file:`esp-tts/esp_tts_chinese/include/esp_tts.h for API reference and see the `chinese_tts <https://github.com/espressif/esp-skainet/tree/master/examples/chinese_tts>__ example in ESP-Skainet.

Resource Occupancy

For the resource occupancy for this model, see Resource Occupancy <../benchmark/README>.