Text-to-Speech Narrator on AWS

Description about the project : Built a serverless application that converts uploaded text files into speech using Amazon Polly .

Things to do in Project:

Step 1:  Choose a text, article or newsletter to be translated from text to speech 

Step2 : A lambda function to retrieve the text and send it to Amazon Polly for synthesis

Step3 : Choose the required language and a voice model provided. Amazon Polly converts the text to speech and sends it to AWS lambda 

Step4 :  The AWS lambda function stores this audio file retrieved from Polly in Simple Storage Service (S3)

Step5 :  The S3 Bucket consists of the final text to speech audio. 

The Architecture of this project will be like this 



Services used in this project:

  • AWS lambda
  • AWS Polly
  • S3
  • IAM
  • CloudWatch

View lambda Function on github : (https://github.com/bilsgotchills/Text-to-Speech-Narrator-on-Aws.git)

How to implement this project :

Step 1: Prerequisties 

  • AWS account
  • IAM user with permission for Lambda , S3 , Polly
  • AWS cli (optional)
Step 2: Create a S3 bucket
  • Naming it "awspolly-bucket-bils"
  • Note the Bucket name 
  • Add the bucket permission so that we can check the speech in it 
 Step 3: Create a IAM role for Lambda . Attach permission
  • AmazonPollyFullAccess
  • S3FullAccess
  • AWSlambdaBasicExecutionRole
Step 4: Implemented a Lambda Function 
  • Runtime will be Node.js 20.x
  • Assign the IAM role you just created 
  • Add the sample code 
Step 5: Test Lambda 
  • Deploy the function 
  • Run a test event 
  • Check your S3 Bucket -- you should see output.mp3
Now Extended Functionality

Step1: Create a Event Notification in S3
  • Event type : ALL object create events or (at least PUT)
  • Suffix filter : .txt
  • Destination : your lambda name or ARN of lambda 

Step2: Add invoke function in Lambda 
  • In lambda console open your function - Configuration - Permission - ResourceBasedPolicy - Add permission
  • Service: Select S3
  • Principal - S3
  • Action - Lambda:InvokeFunction
  • StatementID: give a unique name
  • Source Account: your account ID
  • Bucket ARN : paste your bucket ARN 
  • Now S3 is allowed to invoke your Lambda


Step3: Test your Function
  • Upload a .txt file in S3
  • Lambda will read the file content's , send it to Polly , and save the audio to your bucket (you can use the same bucket for output and input or a different bucket for both )
Input from S3:-

Output in S3:-

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