1. A computing device comprising: one or more computer processors; one or more computer-readable media having instructions stored thereon that, responsive to execution by the one or more computer processors, perform operations comprising: determining, based on one speech waveform, a wideband speech feature and a narrowband speech feature; determining, based on the wideband speech feature, an estimate of the narrowband speech feature; determining, based on the narrowband speech feature and the estimate of the narrowband speech feature, an estimation error of the estimate of the narrowband speech feature; transmitting the wideband speech feature and the estimation error to a remote entity; and receiving, from the remote entity, data associated with a speech-based service based on the wideband speech feature.