# twoPoleTwoZeroFilter(_:coefficients:) Returns the result of double-precision, two-pole, two-zero recursive filtering. ``` static func twoPoleTwoZeroFilter(_ source: U, coefficients: (Double, Double, Double, Double, Double)) -> [Double] where U : AccelerateBuffer, U.Element == Double ``` --- 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)