Bit Rate

bit_rate string

Text to Speech Request Text to Speech Stream English Only

The Bit Rate feature gives users the ability to specify the desired bitrate of the resulting text-to-speech audio output.

When generating audio from text, having control over the bitrate can significantly impact the quality and file size of the output. Bit Rate determines the amount of data processed per unit of time and is typically measured in bits per second (bps).

To enable the Bit Rate feature, include the bit_rate parameter in the query string with the desired bitrate value.

https://api.deepgram.com/v1/speak?encoding=mp3&bit_rate=32000

You can use the following cURL command in a terminal or your favorite API client to synthesize text into speech with a specific bitrate.

MP3 encoding with bitrate of 32 kbits/second::

curl --request POST \
     --url "https://api.deepgram.com/v1/speak?model=aura-2-thalia-en&encoding=mp3&bit_rate=32000" \
     --header "Authorization: Token DEEPGRAM_API_KEY" \
     --header 'Content-Type: application/json' \
     --data '{"text": "Hello, how can I help you today?"}' \
     --output outputfile_mp3_32000.mp3 \
     --write-out "Time-to-First-Byte: %{time_starttransfer}s Time-to-Last-Byte: %{time_total}s\n" \
     --fail-with-body \
     --silent || echo "Request failed"

Upon successful processing of the request, you will receive an audio file containing the synthesized text-to-speech output, along with response headers providing additional information.

HTTP/1.1 200 OK
< content-type: audio/mpeg
< dg-model-name: aura-2-thalia-en
< dg-model-uuid: e4979ab0-8475-4901-9d66-0a562a4949bb
< dg-char-count: 32
< dg-request-id: bf6fc5c7-8f84-479f-b70a-602cf5bf18f3
< transfer-encoding: chunked
< date: Thu, 29 Feb 2024 19:20:48 GMT

This includes:

• content-type: Specifies the media type of the resource, in this case, audio/mpeg, indicating the format of the audio file returned.
• dg-request-id: A unique identifier for the request, useful for debugging and tracking purposes.
• dg-model-uuid: The unique identifier of the model that processed the request.
• dg-char-count: Indicates the number of characters that were in the input text for the text-to-speech process.
• dg-model-name: The name of the model used to process the request.
• transfer-encoding: Specifies the form of encoding used to safely transfer the payload to the recipient.
• date: The date and time the response was sent.