How to adjust the pace (speed)

The pace parameter controls the speed at which the speech is delivered.

It is optional — if omitted, the default value is 1.0 (normal speed).

bulbul:v3 range: 0.5 (slowest) to 2.0 (fastest)
bulbul:v2 range: 0.3 (slowest) to 3.0 (fastest)
Values < 1.0 slow the speech down; values > 1.0 speed it up.

Pace Recommendations by Use Case

Pace Value	Effect	Recommended Use Case
0.5 – 0.7	Very slow, deliberate	Accessibility tools, elderly users, pronunciation guides
0.8 – 0.9	Relaxed, measured	EdTech narration, meditation/wellness apps, tutorials
1.0	Natural speed (default)	Conversational agents, general-purpose TTS
1.1	Slightly brisk	Notifications, news briefings, professional IVR
1.2 – 1.5	Fast, energetic	Quick summaries, high-engagement marketing audio
1.6 – 2.0	Very fast	Screen readers, speed-listening (use with caution)

Start at 1.0 (natural) or 1.1 (brisk, professional contexts). Avoid values above 1.5 unless specifically building speed-listening features.

Example Code

Rest API

Streaming API

1 from sarvamai import SarvamAI
2 from sarvamai.play import save
3 
4 # Initialize the REST client
5 client = SarvamAI(api_subscription_key="YOUR_SARVAM_API_KEY")
6 
7 # Generate speech using REST
8 audio = client.text_to_speech.convert(
9     text="Welcome to Sarvam AI!",
10     model="bulbul:v3",
11     target_language_code="en-IN",
12     pace=1.5  # Increase pace for faster speech
13 )
14 save(audio, "output1.wav")