Speech signal transmission and reception apparatuses and speech signal transmission and reception methods

摘要

A speech signal transmission apparatus includes an extractor to extract speech signals from speech source signals collected by a plurality of microphones, a power calculator to calculate powers of speech signals of multiple channels and set any one of the speech signals of the multiple channels as a reference speech signal, a synchronization adjustor to adjust synchronization of the other speech signals based on the reference speech signal, a signal generator to generate extraction signals by offsetting the reference speech signal from the other synchronization-adjusted speech signals, an encryptor to compress and encrypt the reference speech signal and the extraction signals, and a transmitter to transmit the compressed and encrypted reference speech signal and extraction signals.

主权项

1. A speech signal transmission apparatus comprising:
an extractor to extract a plurality of speech signals from a plurality of speech source signals collected by a plurality of microphones; a power calculator to calculate a plurality of powers of the plurality of speech signals and set any one speech signal among the plurality of speech signals of the multiple channels as a reference speech signal; a synchronization adjustor to calculate a plurality of synchronization parameters of the speech signals among the plurality of speech signals excluding the reference speech signal and to adjust synchronization of the speech signals among the plurality of speech signals excluding the reference speech signal based on the reference speech signal; a signal generator to generate a plurality of extraction signals by offsetting the reference speech signal from each synchronization-adjusted speech signal; an encryptor to compress and encrypt the reference speech signal and the plurality of extraction signals; and a transmitter to transmit the compressed and encrypted reference speech signal and the compressed and encrypted plurality of extraction signals, wherein the power calculator calculates power parameters corresponding to each speech signal among the plurality of speech signals excluding the reference speech signal based on a ratio of a power of each speech signal to a power of the reference speech signal, and wherein the signal generator operates offset signals corresponding to each speech signal among the plurality of speech signals excluding the reference speech signal by applying each power parameter corresponding to each speech signal to the reference speech signal and generates extraction signals by subtracting each offset signal from each speech signal.