Speech recognition

https://github.com/Uberi/speech_recognition

ML - OpenAI

https://github.com/openai/whisper

Azure

https://azure.microsoft.com/en-us/pricing/details/cognitive-services/speech-services/

free per month: 5 audio hours / 0.5 million characters /  10,000 transactions

Text To Speech

My rate: Microsoft Neural > Google > Microsoft Zira Desktop ~ AWS Justin >> IBM/Baidu >> espeak

Microsoft

Demo: https://speech.microsoft.com/customvoice
download: https://greasyfork.org/en/scripts/444347-azure-speech-download

git clone https://github.com/Azure-Samples/cognitive-services-speech-sdk.git
=> quickstart/python/text-to-speech/quickstart.ipynb

https://azure.microsoft.com/en-us/pricing/details/cognitive-services/speech-services/

STT - 5 audio hours free per month
TTS Standard - 5M characters free per month
TTS Neural   - 0.5M characters free per month

Portal: https://portal.azure.com/#blade/HubsExtension/BrowseResource/resourceType/Microsoft.CognitiveServices%2Faccounts

SDK/REST support: https://docs.microsoft.com/en-us/azure/cognitive-services/speech-service/overview

https://docs.microsoft.com/en-us/azure/cognitive-services/speech-service/rest-text-to-speech

Python SDK: https://github.com/Azure-Samples/cognitive-services-speech-sdk/blob/master/quickstart/python/text-to-speech/quickstart.ipynb
Console: https://github.com/Azure-Samples/cognitive-services-speech-sdk/tree/master/samples/python/console
Flask app: https://github.com/MicrosoftTranslator/Text-Translation-API-V3-Flask-App-Tutorial

Bing

https://azure.microsoft.com/en-us/services/cognitive-services/speech/
https://azure.microsoft.com/en-us/pricing/details/cognitive-services/speech-api/

TIER FEATURES UNIT PRICE
Bing Speech API—free Transactions 5,000 transactions free per month
Bing Speech-to-Text API Utterances up to 15 seconds long Transactions $4 per 1,000 transactions
Bing Text-to-Speech API Transactions $4 per 1,000 transactions

https://github.com/westparkcom/Python-Bing-TTS

Ali

Demo: https://ai.aliyun.com/nls/tts
Non-free: https://help.aliyun.com/document_detail/84881.html#h1-u8BA1u8D39u65B9u5F0Fu548Cu62A5u4EF73

Google

https://play.google.com/store/apps/details?id=com.google.android.tts

https://github.com/pndurette/gTTS

gtts-cli -f hello.txt -l 'cs' -o hello.mp3

from gtts import gTTS
tts = gTTS(text='Hello', lang='en', slow=True)
tts.save("hello.mp3")

AWS

https://console.aws.amazon.com/polly
https://aws.amazon.com/polly/pricing/

free: 5 million characters/m/first 12m
$4.00 per 1 million characters

IBM

https://text-to-speech-demo.ng.bluemix.net
https://console.bluemix.net/catalog/services/text-to-speech

Free: 10,000 characters per month. deleted after 30 days of inactivity.
Paid: $0.02 USD/THOUSAND CHAR

https://github.com/watson-developer-cloud/python-sdk

Xunfei

http://www.xfyun.cn/services/offline_tts (99+ RMB/m)

Tencent

https://cloud.tencent.com/product/aai (Price unknown)

Baidu

https://developer.baidu.com/vcast

http://yuyin.baidu.com/#try
http://yuyin.baidu.com/docs/tts/136

Offline

https://en.wikipedia.org/wiki/Comparison_of_speech_synthesizers

https://pyttsx3.readthedocs.io/en/latest/ (no file saving?)

SAPI5 on Windows XP and Windows Vista and Windows 8,8.1 , 10
NSSpeechSynthesizer on Mac OS X 10.5 (Leopard) and 10.6 (Snow Leopard)
espeak on Ubuntu Desktop Edition 8.10 (Intrepid), 9.04 (Jaunty), and 9.10 (Karmic)

http://espeak.sourceforge.net/commands.html

espeak "unnatural man voice"  -w out.wav  # apt install -y libespeak1
setup_espeak.exe #  SAPI5 version

Swift: https://youtu.be/bl6hEBXuv5Y?t=1057

Software

https://en.wikipedia.org/wiki/Comparison_of_digital_audio_editors
https://en.wikipedia.org/wiki/Comparison_of_free_software_for_audio

Audacity: https://github.com/audacity/audacity/releases

Input/Output equalizer: https://sourceforge.net/projects/equalizerapo/

AI Real-Time Voice Cloning: https://github.com/CorentinJ/Real-Time-Voice-Cloning

Music

Apps

Basic

♭ flat:  lower in pitch by one semitone (half step)
♯ sharp: higher in pitch by one semitone (half step)

Equal temperament / 十二平均律: https://baike.baidu.com/item/%E5%8D%81%E4%BA%8C%E5%B9%B3%E5%9D%87%E5%BE%8B/592297