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System Context

2. System Context​

2.1 System Boundary​

The system consists of:

  • The Client Application, responsible for user interaction and local audio playback
  • The Web Portal, responsible for account management and user-facing identity integration
  • The Cloud Service, responsible for authentication, request validation, and synthesis job coordination
  • The Cloud Execution Workers, responsible for performing cloud-based speech synthesis through external providers

Together, these components form the text-to-speech system.

2.2 External Entities​

The system interacts with the following external entities:

  • End User Initiates requests and interacts with the Client Application and Web Portal.
  • External Identity Provider Authenticates users for web-based sessions.
  • External Billing Provider Manages subscription and billing operations.
  • External Virtual Mic Provider Routes generated speech audio into external voice-enabled applications.
  • External Speech Providers Generates speech audio from text on behalf of the system.

2.3 Trust Boundaries​

The system defines the following trust boundaries:

  • Public Boundary
    Requests originating from user-controlled environments are authenticated and validated by the Cloud Service before further processing.

  • Internal Execution Boundary
    Cloud Execution Workers operate only on validated job data received from the Cloud Service and does not accept direct public input.

  • External Dependency Boundary
    The system relies on external entities that are outside its trust domain. Data crossing these boundaries is validated before use.

2.4 Context Diagram​

The following diagram illustrates the system boundary and its external entities.