12. The method as recited in claim 7 , further comprising storing the wideband speech feature for training a second speech recognizer based on wideband speech features.
7. A method comprising: receiving a wideband speech feature from a remote entity; determining an estimate of a narrowband speech feature based on the wideband speech feature; providing the estimate of the narrowband speech feature to a speech recognizer trained on the narrowband speech features; receiving, from the speech recognizer, speech-recognition results based on the estimate of the narrowband speech feature; and transmitting, to the remote entity, the speech-recognition results based on the estimate of the narrowband speech feature.