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5.2.5 Text to Speech

Feature Introduction​

This chapter introduces the basic functionality and usage of Text-to-Speech (TTS).

One-Click Deployment (Optional)​

This project provides a one-click installation Deb package.

Please ensure the device firmware version is not less than 2.2rc2. Firmware download address: https://archive.spacemit.com/image/k1/version/bianbu/

Install Deb Package​

sudo apt update
sudo apt install asr-llm-tts

After installation, the device needs to be restarted to activate the system service. After restart completion, execute:

journalctl --user -u demo_serve -f

Observe the system log until the following information appears:

When the log displays 'All models init successfully!', it indicates that the TTS service has started and is ready to use.

Usage​

Run in terminal:

tts

Press Enter to start using the text-to-speech functionality.

Preparation​

Clone Code​

git clone https://gitee.com/bianbu/spacemit-demo.git

Install Environment​

sudo apt install python3-venv

python3 -m venv .venv
source .venv/bin/activate

pip install -r requirements

Search System Playback Devices​

Method 1: Using aplay​

root@bianbu:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndhdmi [snd-hdmi], device 0: SSPA2-dummy_codec dummy_codec-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: sndes8326 [snd-es8326], device 0: i2s-dai0-ES8326 HiFi ES8326 HiFi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Based on the output results, determine the playback device index number and modify the corresponding playback device index in the code.

Method 2: Using pactl Tool to Query Default Playback Device​

Install tool:

sudo apt install pulseaudio-utils

Query playback device list:

root@bianbu:~# pactl list short sinks
64	alsa_output.platform-snd-card_1.stereo-fallback	PipeWire	s16le 2ch 48000Hz	SUSPENDED
66	alsa_output.platform-c0900100.udc.stereo-fallback	PipeWire	s16le 2ch 48000Hz	SUSPENDED
252	alsa_output.platform-snd-card_0.stereo-fallback	PipeWire	s16le 2ch 48000Hz	SUSPENDED
321	alsa_output.usb-C-Media_Electronics_Inc._USB_Audio_Device-00.analog-stereo	PipeWire	s16le 2ch 48000Hz	SUSPENDED

Test audio playback to corresponding devices to confirm effective playback devices:

# A. Test playback to card_0
pw-play --target alsa_output.platform-snd-card_1.stereo-fallback /usr/share/sounds/alsa/Front_Center.wav

# B. Test playback to card_1
pw-play --target alsa_output.platform-c0900100.udc.stereo-fallback /usr/share/sounds/alsa/Front_Center.wav

# C. Test playback to card_3
pw-play --target alsa_output.platform-snd-card_0.stereo-fallback /usr/share/sounds/alsa/Front_Center.wav

# D. Test playback to card_4 (external USB speaker)
pw-play --target alsa_output.usb-C-Media_Electronics_Inc._USB_Audio_Device-00.analog-stereo /usr/share/sounds/alsa/Front_Center.wav

After confirming the device, set the default playback device:

pactl set-default-sink alsa_output.usb-C-Media_Electronics_Inc._USB_Audio_Device-00.analog-stereo

Click on the device in the interface to switch the default playback device.

Start Text-to-Speech Program​

python 07_tts_demo.py

Enter text in the command line, and the program will convert the text to speech and play it.