> ## Documentation Index > Fetch the complete documentation index at: https://dragonwingdocs.qualcomm.com/llms.txt > Use this file to discover all available pages before exploring further. # List available TTS models and voices > Returns available TTS models with voices, capabilities, and supported sample rates. Filter by language using the `language` query parameter. ## OpenAPI ````yaml /Ubuntu/ai-workflows/api-specs/audio-analytics/openapi.yaml get /tts/models openapi: 3.0.3 info: title: Audio Analytics API version: 1.0.0 description: > REST API providing AI-powered audio processing: speech recognition (ASR), text translation (T2T), and speech synthesis (TTS). ## Services | Service | Endpoint prefix | Description | |---------|----------------|-------------| | ASR | `/transcriptions/` | Whisper-based speech-to-text (file or live WebSocket streaming) | | T2T | `/translations/` | Opus/NLLB text translation (batch supported) | | TTS | `/tts/` | MeloTTS speech synthesis; returns raw PCM audio | ## Audio formats (ASR input) - WAV, 16-bit PCM; 16 kHz mono recommended; max 25 MB ## TTS output - Supported sample rates: 44100, 22050, 16000 Hz (auto-resampled) ## WebSocket streaming sequence ``` App Server |===POST /transcriptions/create================>| |<==200 {session_id, state: asr_initialized}====| | |===WS /stream=================================>| |<== {state: connection_established}===========| | |===WS {transcriptions_session_audio} (loop)===>| |<===WS {transcript.event, speech_start}====| |<===WS {transcript.text.delta, ...}============| (zero or more) |<===WS {transcript.event, speech_end}======| |<===WS {transcript.text.done, ...}============| | |===POST /transcriptions/close=================>| (after transcript.text.done) ``` ## Authentication None required. contact: name: Qualcomm Support Forums url: https://mysupport.qualcomm.com/supportforums/s/ license: name: BSD-3-Clause-Clear url: https://opensource.org/licenses/BSD-3-Clause-Clear servers: - url: http://{device-ip}:{device-port}/audio-analytics/v1/api description: Audio Analytics API Server variables: device-ip: description: IP address and port of the host device running the Audio Analytics API default: localhost device-port: default: '8085' security: [] tags: - name: Health description: Service health and status endpoints - name: Transcriptions description: Speech-to-text audio transcription (ASR) - name: Translations description: Text-to-text translation between languages - name: TTS description: Text-to-speech synthesis - name: WebSocket description: Real-time streaming communication paths: /tts/models: get: tags: - TTS summary: List available TTS models and voices description: > Returns available TTS models with voices, capabilities, and supported sample rates. Filter by language using the `language` query parameter. operationId: listTTSModels parameters: - name: language in: query required: false description: Filter by ISO 639-1 language code (e.g., 'en' for English) schema: type: string example: en responses: '200': description: List of available TTS models content: application/json: schema: type: array items: $ref: '#/components/schemas/TTSModel' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' components: schemas: TTSModel: type: object description: Text-to-speech model information properties: name: type: string description: Unique model identifier example: melo-tts-en display_name: type: string description: Human-readable model name example: MeloTTS English version: type: string description: Model version example: 1.0.0 description: type: string description: Model description example: MeloTTS text-to-speech model with English support voices: type: array items: $ref: '#/components/schemas/TTSVoice' description: Available voices for this model capabilities: type: object description: Model capabilities properties: supports_gender: type: boolean description: Supports gender selection supports_style: type: boolean description: Supports speaking style selection supports_sample_rate: type: boolean description: Supports custom sample rate supports_ssml: type: boolean description: Supports SSML input supports_speed_control: type: boolean description: Supports speaking speed control supports_pitch_control: type: boolean description: Supports pitch control supports_volume_control: type: boolean description: Supports volume control supports_resampling: type: boolean description: Supports automatic resampling parameters: type: object description: Model parameters and constraints properties: max_text_length: type: integer description: Maximum text length supported_formats: type: array items: type: string description: Supported output formats sample_rates: type: array items: type: integer description: Supported sample rates in Hz speed_range: type: array items: type: number description: Speaking speed range [min, max] pitch_range: type: array items: type: number description: Pitch range [min, max] volume_range: type: array items: type: number description: Volume range [min, max] required: - name ErrorResponse: type: object description: Standard error response structure properties: error: type: object properties: message: type: string description: Human-readable error message example: Invalid request, missing 'file' parameter type: type: string description: Error type or category example: invalid_request_error param: type: string nullable: true description: Parameter related to the error (if applicable) example: file code: type: string nullable: true description: Error code (if applicable) example: null required: - message - type required: - error TTSVoice: type: object description: Text-to-speech voice information properties: name: type: string description: Unique voice identifier example: default display_name: type: string description: Human-readable voice name example: Default Voice language: type: string description: ISO 639-1 language code example: en language_name: type: string description: Language name example: English gender: type: string description: Voice gender enum: - male - female - neutral example: neutral style: type: string description: Speaking style example: neutral sample_rate: type: integer description: Native sample rate in Hz example: 44100 description: type: string description: Voice description example: Default voice for English required: - name - language ````