Ranked #1 in Speech Arena
Improve the clarityof AI-generated speech
Change a setting, then hear the difference
Play the sentence at its default settings. Adjust speed or volume, then generate it again. Keep the words the same while comparing.
The interactive preview lets you edit a sentence and adjust speed and volume before generating it. You can also use these controls in Playground.
The interactive preview lets you edit a sentence and adjust speed and volume before generating it. You can also use these controls in Playground.
Speed and volume are generation guidance. The effect varies with the voice and text, so listen to a representative passage before choosing settings for your project.
Start with what you hear
A pronunciation problem needs a different adjustment from an audio-format mismatch. Change the part of the workflow that causes the problem.
A name sounds wrong
Add a pronunciation dictionary
Use sounds-like guidance or IPA for a recurring word. Listen to it within a complete sentence, not only in isolation.
The sentence feels rushed
Refine punctuation and speed
Shorten a crowded sentence first. If needed, lower the speed setting and compare the same passage again.
The delivery feels flat
Check the voice and script
Choose a voice suited to the language and intended tone. Add emotion guidance when it agrees with the words.
Playback sounds distorted
Check the audio format
Match the player's encoding and sample rate to the generated audio before changing the model settings.
How to improve an AI voice recording
A repeatable listening check helps you choose settings you can use again.
Keep the words fixed
Choose a sentence with the problem you want to fix. Include the names, punctuation, and phrases your audience will hear. Save the first result as your reference.
Change one setting
Keep the script fixed and adjust one setting, such as speed or a dictionary entry. If you compare voices, leave the other controls unchanged.
Listen in the destination
Compare the original generation with the new one through your player or phone connection. Check sentence endings and important words before saving the settings.
Keep the delivery consistent
Save the voice, transcript, and settings together. Reuse the same pronunciation dictionary for recurring names and technical terms across your recordings.
Guide the delivery
Use speed and volume to refine a voice that already suits the script. The controls guide generation, so compare a complete passage rather than expecting an exact change in duration or loudness.
Reuse pronunciations
Give a recurring name or technical term a dictionary entry. Test it in context, then apply that dictionary to later scripts so you can maintain the pronunciation in one place.
Give difficult words a clear pronunciation
Listen to Sonic's pronunciation examples. For names and specialist terms in your own scripts, create a pronunciation dictionary and check each word in a full sentence.
Read the pronunciation guide- Pronunciation examples
charcuterie
shar-koo-terie
subpoena
/səˈpiːnə/
epinephrine
/ˌɛpɪˈnɛfrɪn/
Lifelike, expressive voices for every use case
Compare Sonic voices for narration, lessons, and customer conversations. Start with a voice that fits your script, then refine pronunciation and pacing using the same passage.
Support
Turn customer support answers into spoken responses with speech synthesis. Read service updates and troubleshooting steps in a consistent voice across calls and applications.
Gaming
Generate character dialogue from your game's scripts. Compare voices for each role, then listen to new lines in context to check pacing and delivery.
Content
Create voiceovers for videos, tutorials, and product explainers from text. Revise a script and generate new narration without recording each line again.
Media
Turn written articles and stories into spoken audio. Use text-to-speech for podcast introductions or narrated news, checking names and pronunciation before publishing.
Healthcare
Read appointment reminders and patient service information from your team's reviewed text. Use a consistent voice for routine instructions and scheduling updates.
Sales
Add spoken narration to product demonstrations and sales explainers. Test your script in different voices, then update the audio when your product or message changes.
Voice Agents
Give AI voice agents spoken responses generated from your application's text. Choose a voice for greetings and conversations, then test how it sounds across short and longer replies.
Dubbing
Generate speech from translated scripts for your localization workflow. Compare voices in supported languages and review pronunciation and timing before adding the audio to a video.
Avatars
Pair a digital avatar with synthesized speech for presentations and guided experiences. Generate dialogue from text and coordinate audio playback with your avatar's animation.
Logistics
Turn shipment updates and dispatch instructions into spoken messages. Connect speech synthesis to your application so the audio reflects the latest delivery information.
Recruiting
Create spoken interview introductions and candidate scheduling messages from approved scripts. Keep instructions consistent and regenerate the audio when your hiring process changes.
Accessibility
Offer audio versions of written guides, articles, and learning materials. Let people listen to your content and follow along with the original text at their own pace.
Clone a voice to read new scripts
Create a reusable voice from a clean recording with AI voice cloning. Choose source audio with the tone and delivery you want, then test the clone on new scripts before refining the result.
Use your own voice or one you have permission to clone. Compare the original recording and its clone, then test your script to hear how the voice handles tone, accent, and pronunciation.
Explore AI voice cloningFluent and native, worldwide
Generate speech from text in 44 languages with Sonic. Listen to language and accent samples for multilingual voiceovers, narrated lessons, and localized videos. Review translated scripts and pronunciation before publishing.
American English, 3 voices
American English
Explore more voice tools
AI voice enhancement FAQs
What does AI voice enhancement mean here?
This page focuses on improving new speech generated from text with Cartesia Sonic. You can choose a more suitable voice, refine the script, guide pacing and volume, and use pronunciation dictionaries. These controls act during speech generation.
Can I upload a recording to remove background noise?
This page does not offer an upload-and-clean audio tool. Sonic generates speech from text. Removing hiss, echo, or background sounds from an existing recording is an audio restoration task and needs a tool designed for that purpose.
What should I change if a generated voice sounds rushed?
Start with complete sentences and natural punctuation. Split a dense paragraph into clear phrases. If the delivery is still too fast, try a lower speed setting and generate the passage again. Speed is guidance rather than an exact duration multiplier; compare the result using the same voice and script.
How can I improve pronunciation?
Test the word in a full sentence before changing it. Pronunciation dictionaries can replace a word or phrase with sounds-like guidance or IPA. Create the dictionary in Playground or through the API, then use it for the requests that need it. Check the surrounding sentence after each change.
Can I change the emotion of AI speech?
Sonic interprets the emotional context of the script and also supports emotion guidance through Playground and the API. Emotion tags currently support English. Pick a direction that fits the words. A conflicting instruction will not reliably produce the delivery you want.
Do speed and volume controls work with every voice?
The controls apply to standard voices and Instant Voice Clones. Pro Voice Clones learn pacing and volume from their training recordings and do not support request-time changes to those settings. For a pro clone, prepare recordings with the delivery you want.
Why does the audio sound wrong in my application?
First check the output format. Raw PCM needs a player configured for the same sample rate and encoding as the generated audio. A mismatch can change playback speed or produce distorted sound. WAV or MP3 files include format information and are useful when saving audio for a compatible player.
Can I keep the same settings for future generations?
Yes. Keep the voice ID, script, and generation settings together in your workflow. In an API integration, pass generation_config on every request that needs those settings, and include the pronunciation dictionary ID when applicable. The API does not make generation_config an account-wide preference.
Can I improve AI voiceovers for videos and lessons?
Yes. Start with the script your audience will hear and generate a short section before producing the full voiceover. Check names, pauses, and the pace of explanations against your edit. If a sentence is difficult to follow, rewrite it before changing several voice settings. Use the same test passage when comparing revisions.
How do I keep product names consistent in text to speech?
Add recurring names to a pronunciation dictionary and test them in complete sentences. In an API workflow, pass that dictionary's ID with the request. Keep your dictionary up to date when a product name or preferred pronunciation changes, rather than rewriting phonetic spellings into every script.
What can I adjust in the preview on this page?
The preview lets you edit the text and adjust speed and volume before generating speech. Keep the words fixed for an initial comparison, then listen again after changing one control. Open Playground to explore other voices and pronunciation dictionaries. The preview generates new speech from text; it does not process an uploaded recording.
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