A method of detecting speech of incoming sound at a portable communication device, comprising: - generate a microphone signal by a microphone arrangement of the portable communication device in response to the incoming sound, - divide the microphone signal into a plurality of separate frequency band signals comprising at least a first frequency band signal suitable for detecting onsets of voiced speech and a second frequency band signal suitable for detecting onsets of unvoiced speech, - determine a first power envelope signal of the first frequency band signal and a second power envelope signal of the second frequency band signal, - deriving a first stationary noise power signal and first non-stationary noise power signal from first power envelope signal, - derive a first clean power signal by subtracting the first stationary noise power signal and the first non-stationary noise power signal from the first power envelope signal, - derive a second stationary noise power signal and second non-stationary noise power signal from second power envelope signal, - derive a second clean power signal by subtracting the second stationary noise power signal and the second non-stationary noise power signal from the second power envelope signal, - determine onsets of voiced speech in the first frequency band signal based on the first stationary noise power signal and first clean power signal, - determine onsets of unvoiced speech in the second frequency band signal based on the second stationary noise power signal and second clean power signal, - increasing or decreasing a value of a speech probability estimator based on determined onsets of voiced speech and determined onsets of unvoiced speech. - generate a microphone signal by a microphone arrangement of the portable communication device in response to the incoming sound, - divide the microphone signal into a plurality of separate frequency band signals comprising at least a first frequency band signal suitable for detecting onsets of voiced speech and a second frequency band signal suitable for detecting onsets of unvoiced speech, - determine a first power envelope signal of the first frequency band signal and a second power envelope signal of the second frequency band signal, - deriving a first stationary noise power signal and first non-stationary noise power signal from first power envelope signal, - derive a first clean power signal by subtracting the first stationary noise power signal and the first non-stationary noise power signal from the first power envelope signal, - derive a second stationary noise power signal and second non-stationary noise power signal from second power envelope signal, - derive a second clean power signal by subtracting the second stationary noise power signal and the second non-stationary noise power signal from the second power envelope signal, - determine onsets of voiced speech in the first frequency band signal based on the first stationary noise power signal and first clean power signal, - determine onsets of unvoiced speech in the second frequency band signal based on the second stationary noise power signal and second clean power signal, - increasing or decreasing a value of a speech probability estimator based on determined onsets of voiced speech and determined onsets of unvoiced speech.