Patent US 3,946,504

An utterance training machine comprises flow speed detector for converting the flow speed of expiration into an electrical signal to provide a flow speed signal, acoustic-electric converter for converting a voice into an electrical signal to provide a speech signal, an endless recording medium for recording and retaining thereon the speech signal and the flow speed signal, record-reproduce unit for causing the speech and flow speed signals to be recorded on the endless recording medium and for reproducing the recorded signals from the recording medium, set unit for setting the record-reproduce unit to record mode or reproduce mode, and display unit for recieving the flow speed and speech signals from the endless recording medium to display the waveforms of these signals on a screen when the record-reproduce unit is set to the reproduce mode by the set unit.