Is voice AI the same as text to speech?
No. Text to speech is one part of voice AI: it turns written text into spoken audio. A voice AI system also has to understand what a person says and decide how to reply, using speech recognition and a language model, or a speech-to-speech model that does both.
What is the difference between voice AI and a voice assistant?
Voice AI is the technology. A voice assistant is one product built with it, usually a general helper on a phone or smart speaker that answers questions and carries out commands for its owner. A website voice agent is another, built to answer one company’s customers about its products.
What can an AI voice agent do?
It can answer questions from the information it has, ask clarifying questions and, when it’s connected to tools, look things up or take actions such as booking a meeting. What a particular agent can do depends on the tools and permissions its builder gives it.
What is the difference between a website voice agent and a voice widget?
The voice widget is the part you see: the button and call panel on the page. The website voice agent is the AI behind it that listens, searches its knowledge and answers. People often use either term for the whole product.
What is an AI voice assistant for a website?
It’s a voice assistant that lives on a company’s website and answers visitors’ questions aloud about that company’s products. Also called a website voice agent, it runs in the browser through a widget rather than on a phone line.
Is a voice assistant always listening?
Most phone and smart-speaker assistants listen on the device for their wake word, keeping only a few seconds of audio until they hear it, as the European Data Protection Board describes. A website voice agent such as Kawl Now hears nothing until the visitor starts a call and allows the microphone.
Is speech recognition the same as voice recognition?
Not quite. Speech recognition works out what was said. Voice recognition often means speaker recognition, which works out who is speaking from the sound of their voice. Some products do both, which is why the terms get mixed up.
What is the difference between ASR and speech to text?
There isn’t one in everyday use: speech to text is the plain-English name for automatic speech recognition. Vendors often call the product speech to text and the underlying technology ASR.
What is the difference between text to speech and speech to text?
They run in opposite directions. Text to speech turns written words into audio, and speech to text, also called automatic speech recognition, turns spoken audio into written words. A chained voice agent uses both: one to hear the caller and one to reply.
From What is text to speech (TTS)? How speech synthesis works
Is speech-to-speech better than speech to text plus text to speech?
Neither is better for every job. Speech-to-speech suits live conversation because one model handles the whole exchange. A chained pipeline suits teams that need to inspect, store or approve the text before it’s spoken, or to choose each component themselves.
What does S2S mean in AI?
S2S is short for speech to speech: AI that turns spoken input into spoken output, usually with one model working on the audio itself, whether to hold a conversation, translate between languages or change the voice of a recording.
What is the difference between VAD and endpointing?
VAD labels each moment of audio as speech or not speech. Endpointing uses that, and sometimes the words themselves, to decide that a speaker has finished, for example after a set length of silence.
Does voice activity detection work in noisy places?
Less reliably. Noise, music and other voices can be mistaken for speech, so systems raise the threshold, apply noise suppression or use detectors trained on noisy audio. Testing where your users actually call from is the best check.
What is a good endpointing timeout?
There’s no single right value. The W3C’s VoiceXML standard suggests 0.3 to 1.0 seconds of silence after a complete answer, with a longer wait when the answer is incomplete. Shorter suits quick yes-or-no exchanges, and longer suits callers describing a problem.
Why does a voice agent interrupt me?
Usually because its endpointing treats a pause as the end of your turn, or because noise or its own echo is detected as speech. Longer silence timeouts, end-of-turn models that read the words, echo cancellation and noise suppression all reduce it.
Should a voice agent allow barge-in?
Usually, yes, because people interrupt to correct or redirect, and waiting feels slow. The usual exception is a short passage a caller must hear in full, such as a legal notice. Kawl Now has no setting that makes an answer uninterruptible, and every agent is told to stop and listen when the caller talks over it. Interruption handling hasn’t been verified in a recorded test yet, so check it, along with noise and echo, before you switch on customer calls.
What does barge-in mean in a call centre?
In contact centres, barge-in also means a supervisor joining a live call between an agent and a customer, usually after listening in. In voice systems and IVR, it means the caller interrupting a prompt.
What is the difference between full duplex and half duplex?
Full duplex carries signals both ways at the same time, like a phone call. Half duplex carries them both ways but one at a time, like a walkie-talkie, so one side has to stop before the other can be heard.
Is WebRTC full duplex?
Yes. A WebRTC connection sends and receives audio at the same time, so two people, or a person and an AI agent, can be heard at once. Whether the conversation feels full duplex also depends on the software at each end.
Is WebRTC secure?
WebRTC encrypts media and data by design: the IETF standard requires SRTP for audio and video and DTLS for data channels, and browsers ask permission before a page can use the microphone or camera. The application around it still needs its own controls, such as deciding who may start a call.
Does WebRTC need a server?
Usually. Two browsers can exchange media directly, but they need a signalling server to swap offers and answers, and often STUN or TURN servers to get through firewalls. A voice agent adds a media server or AI service as the other end of the call.
Is text to speech the same as voice cloning?
No. Text to speech can use any voice, including stock voices made by the provider. Voice cloning is a use of speech synthesis that copies a particular person’s voice from recordings of them, which raises questions of consent.
From What is text to speech (TTS)? How speech synthesis works
How much audio does voice cloning need?
It depends on the provider, from hours of studio recording to a short clip. OpenAI’s custom voices, for example, use a reference sample of 30 seconds or less, plus a separate consent recording from the same person.
What does VUI stand for?
VUI stands for voice user interface: the spoken side of a product, covering what it says, how it listens and how people move through a conversation with it.
What is the difference between a VUI and a GUI?
A graphical user interface (GUI) is used by looking and pointing: menus, buttons and forms on a screen. A voice user interface is used by speaking and listening. Many products combine the two, such as a voice agent that shows captions and buttons while you talk.