NOISE REMOVING CIRCUIT

PURPOSE:To surely remove high frequency noises generated at a discontinuous part of a joint and to connect two speech patterns smoothly by comparing a pattern generated by a noise removal pattern generation part with a digital speech pattern which is being inputted currently. CONSTITUTION:When an operation start signal 4 is inputted, it is judged repeatedly whether or not a pattern is present on a digital pattern input line 3. When the pattern is present, the difference between a pattern generated by a noise removal pattern generation part 1 and the pattern which is inputted currently is calculated and the difference data is stored in a register 2a. Then, when the difference is not within a constant range, the difference data is sent out to a noise removal pattern generation part, but an operation stop signal is not outputted. This starting operation is repeated and when the difference enters the constant range, the operation stop signal is outputted. Consequently, high frequency noises generated at discontinuous points are removed and a waveform B which varies smoothly and connects with a waveform C can be generated.