![]() IBM Watson Text to Speech tool fits this task perfectly well. Similarly to the speech-to-text task, IBM Watson provides a service for performing text-to-speech task. ![]() To use Premium level, you should contact the IBM to agree on the details. If you're going to use customization models, you will have to pay 0.03 USD in addition to the Standard level prices. They depend on the number of minutes you want to process (Graduated Tiered Pricing). ![]() Then, the flexible per minute prices are used. The standard level provides free access for the first 1000 minutes of processed audio per month. There are three levels of access to the service. You can become familiar with the supported audio file formats in the documentation. Other useful functions available in the IBM Watson Speech to Text are word alternatives (in beta), word confidence, word timestamps, profanity filtering, smart formatting for phone numbers, dates, currency, etc. Keywords spotting allows detecting the user-defined strings directly from the speech. When they are merged with the master version, this allows identifying different speakers for English, Spanish and Japanese languages. At the moment, such functions as keywords spotting and labeling of speakers are available in beta version. Furthermore, the custom models are available for even fewer number of languages. The main flaw of the IBM Watson Speech to Text is the very small amount of supported languages. So, you can adapt the system to the environment where you are planning to use it. IBM Watson supports customization not only for specific words dictionary but also for the particular acoustic condition. IBM Watson Speech to Text is a service provided by IBM Watson that can convert human speech into text. It is interesting that the total monthly capacity is limited to 1 million minutes of audio. If you want to process more than 60 minutes, you should pay 0.006 USD per 15 seconds. Up to 60 minutes of the processed audio is free for each user. The files you want to process can be directly fed to the API or be stored on the Google Cloud Storage. The system is built using deep neural networks and can be improved over time. For some languages the filter for inappropriate words is available. It is stable against side noises in the audio. API can work both in batch and real-time modes. The system supports customization in the form of providing the list of possible words to be recognized (this thing is especially useful if you want to use speech recognition in some devices or other situations where the list of possible words is limited). This API supports more than 110 languages. It allows converting human speech into text. Google Cloud Speech API is a part of Google Cloud infrastructure. We will describe the general aspects of each API and then compare their main features in the table. There are some other less-known products which can work with speech: Here is a list of some popular APIs for speech processing: The second is to convert the text into human speech. ![]() First one is to transform speech to text. There are two main tasks in speech processing. In this article, we want to compare the most popular APIs which can work with human speech. So, you will be able to detect, when you should use API (and what API) and when you should think about your own system. You can understand what each API can do, what pros and cons they have and so on. Also, it is possible to improve the quality of the results if you build the algorithms by yourself. This way is rather complex, it requires many efforts and resources, but as a result, you can create a system that will be ideally compatible with your needs. Nevertheless, there are many situations where you cannot use API and need to develop speech recognition system from scratch. The one more advantage of this way is that you can save such valuable resources as time and money. In other words, if your problem is standard and well-known. This approach is useful when you don’t need something special. Then you will receive the response with completed tasks. All you need to do is to send an HTTP request with required content to the API’s server. Usually, they provide a convenient interface. You don’t have to be the expert in natural language processing to use these APIs. Today, many large companies provide APIs for performing different machine learning tasks. That’s why speech recognition is a perspective and significant area of artificial intelligence and machine learning. Machines replace more and more human labor force, and these machines should be able to communicate with us using our language. It is especially important regarding the development of self-services in different places: shops, transport, hotels, etc. There is a significant demand in transforming human speech into text and text into speech. Speech processing is a very popular area of machine learning.
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