1. A method comprising: determining, based on a speech waveform, a first type of speech feature and a second type of speech feature; determining, based on the first type of speech feature, an estimate of the second type of speech feature; determining, based on the second type of speech feature and the estimate of the second type of speech feature, an estimation error of the estimate of the second type of speech feature; transmitting the first type of 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 first type of speech feature.