# start(inputSequence:) Starts analysis of an input sequence and returns immediately. ``` final func start(inputSequence: InputSequence) async throws where InputSequence : Sendable, InputSequence : AsyncSequence, InputSequence.Element == AnalyzerInput ``` ## Parameters `inputSequence` A new input sequence. ## Discussion This method stops the autonomous analysis of the previous input sequence. Any audio that hasn’t been consumed will be ignored but audio that has been consumed will continue to be analyzed. To ensure the previous sequence’s input is fully consumed, call [`finalize(through:)`](/documentation/Speech/SpeechAnalyzer/finalize(through:)) first. The previous input sequence may be rendered inoperable depending on its implementation. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)