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google_cloud_AI_ML
This repository contains code to learn AI and ML on Google Cloud Platform
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This repository contains a reference implementation demonstrating how the Google Cloud Text-to-Speech Service can be used to easily implement text-to-speech functionality for Electronic Program Guides (EPG's).
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This repository contains a reference implementation demonstrating how the Google Cloud Text-to-Speech API can be used to easily implement text-to-speech functionality for Electronic Program Guides (EPG's). This is particularly relevant due to new Ofcom guidance that mandates that EPG's must offer text-to-speech functionality in order to meet customers accessibility requirements.
This repository contains two supporting components that augment the Google Cloud Text-to-Speech API to deliver a reference implementation and demo for the EPG use-case. These components, alongside the utilised Google Cloud Services make it possible to deliver a highly performant, and extremely cost effective implementation of text-to-speech for EPG's and other similar use cases.
A hosted version of this demo is available here.
Note: This is not an officially supported Google product
| Component | Source | Description |
|---|---|---|
| get-speech-service | get-speech-service/ | The get-speech-service is a web service written in Golang that is responsible for handling requests for speech synthesis.Clients send a POST request to the /getSpeech endpoint containing the text that needs to be synthesised, alongside some additional configuration parameters.The get-speech-service then sends the text from the request to the Google Cloud Text-to-Speech API and saves the resulting audio file in Google Cloud Storage.Finally, a time-bound Signed URL is generated for the resulting audio file which is returned to the client to be played to the user.On each request, the get-speech-service also checks if synthesised audio for the requested text payload (and associated configuration) already exists. If so, a new it is immediately generated and returned to the client for the existing file, avoiding the need to re-synthesise the audio. This has significant performance benefits and provides cost savings. |
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| epg-ui | epg-ui/ | The epg-ui is an extremely simple static website that is used for emulating an EPG for demo purposes. It provides a mock EPG where users can click elements. Some lightweight JavaScript then calls the get-speech-service to fetch an URL for the synthesised audio, which is then played back to the user. |
This demo makes use of the following Google Cloud Services:
The below diagram illustrates how the components communicate:
| Step | Explanation |
|---|---|
| 0 | When the get-speech-service starts, it makes a call to Secrets Manager and loads the Cloud CDN signing key for later use to provide secure, time bound URL's for accessing synthesised audio. |
| 1 | A user clicks an item to be spoken on the epg-ui (or real life client such as a set-top box). |
| 2 | The epg-ui (or real life client such as a set-top box) sends a POST request to the get-speech-service containing a JSON payload which contains the text to be synthesised, alongside optional configuration parameters. |
| 3 | The get-speech-service generates a hash of the text to be synthesised, and any optional configuration passed with the request. It checks to see if there is already a synthesised audio file in GCS Bucket. |
| 4 | If there is no existing synthsised audio file in the GCS Bucket, the get-speech-service sends the text to the Text-to-Speech Service to be synthesised. |
| 5 | The get-speech-service writes the synthesised audio from the Text-to-Speech Service to the GCS Bucket. |
| 6 | The get-speech-service generates a Signed URL to provide secure, time bound access to the synthesised audio. |
| 7 | The get-speech-service returns a response to the epg-ui (or alternate consuming client) containing a Cloud CDN Signed URL that provides access to the synthesised audio. |
| 8 | The epg-ui (or alternate consuming client) loads the audio file from Cloud CDN,. If the file is in cache it will be returned directly from the CDN. |
| 9 | If the audio file is not in cache it will be loaded from the GCS Bucket and cached for future requests. |
| 10 | The epg-ui plays the synthesised audio to the user. |
For more information on these components see the get-speech-service and epg-ui instructions.
Deployment instructions are contained within the component directories. See the get-speech-service instructions and epg-ui instructions.
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