Some products and features are in the process of being renamed. Generative playbook and flow features are also being migrated to a single consolidated console. See the details.
Required. Audio encoding of the synthesized audio content.
sampleRateHertz
integer
Optional. The synthesis sample rate (in hertz) for this audio. If not provided, then the synthesizer will use the default sample rate based on the audio encoding. If this is different from the voice's natural sample rate, then the synthesizer will honor this request by converting to the desired sample rate (which might result in worse audio quality).
Optional. Configuration of how speech should be synthesized. If not specified, Agent.text_to_speech_settings is applied.
OutputAudioEncoding
Audio encoding of the output audio format in Text-To-Speech.
Enums
OUTPUT_AUDIO_ENCODING_UNSPECIFIED
Not specified.
OUTPUT_AUDIO_ENCODING_LINEAR_16
Uncompressed 16-bit signed little-endian samples (Linear PCM). Audio content returned as LINEAR16 also contains a WAV header. LINT: LEGACY_NAMES
OUTPUT_AUDIO_ENCODING_MP3
MP3 audio at 32kbps.
OUTPUT_AUDIO_ENCODING_MP3_64_KBPS
MP3 audio at 64kbps. LINT: LEGACY_NAMES
OUTPUT_AUDIO_ENCODING_OGG_OPUS
Opus encoded audio wrapped in an ogg container. The result will be a file which can be played natively on Android, and in browsers (at least Chrome and Firefox). The quality of the encoding is considerably higher than MP3 while using approximately the same bitrate.
OUTPUT_AUDIO_ENCODING_MULAW
8-bit samples that compand 14-bit audio samples using G.711 PCMU/mu-law.
OUTPUT_AUDIO_ENCODING_ALAW
8-bit samples that compand 13-bit audio samples using G.711 PCMU/a-law.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-10 UTC."],[[["This document describes the `OutputAudioConfig`, which is used to instruct the speech synthesizer on how to generate the output audio content."],["The `audioEncoding` field is required and specifies the audio encoding of the synthesized audio content, referencing the `OutputAudioEncoding` enum."],["The `sampleRateHertz` field, which is optional, sets the synthesis sample rate in hertz, and if not provided, the synthesizer will use the default sample rate."],["The `synthesizeSpeechConfig` field, which is optional, configures how speech should be synthesized, and if not specified, the `Agent.text_to_speech_settings` are applied."],["The `OutputAudioEncoding` enum includes various audio encoding options such as `OUTPUT_AUDIO_ENCODING_LINEAR_16`, `OUTPUT_AUDIO_ENCODING_MP3`, and `OUTPUT_AUDIO_ENCODING_OGG_OPUS`, among others."]]],[]]
