1. A code conversion method for converting a first code sequence conforming to a first speech coding scheme into a second code sequence conforming to a second speech coding scheme, said method comprising the steps of: (A) inputting said first code sequence, and discriminating whether said first code sequence corresponds to a speech part or to a non-speech part and generating a discrimination result; (B) inputting said first code sequence, converting said first code sequence into said second code sequence and outputting said second code sequence, when the discrimination result indicates the speech part; (C) encoding pre-determined one or more sound signals corresponding to non-speech including silence, noise and tones into codes by said second speech coding scheme, and pre-storing the codes encoded by said second speech coding scheme; and (D) stopping to input said first code sequence, generating said second code sequence by reading said pre-stored codes corresponding to a value based on the discrimination result, and outputting the generated second code sequence, when the discrimination result indicates the non-speech part.
1. A code conversion method for converting a first code sequence conforming to a first speech coding scheme into a second code sequence conforming to a second speech coding scheme, said method comprising the steps of: (A) inputting said first code sequence, and discriminating whether said first code sequence corresponds to a speech part or to a non-speech part and generating a discrimination result; (B) inputting said first code sequence, converting said first code sequence into said second code sequence and outputting said second code sequence, when the discrimination result indicates the speech part; (C) encoding pre-determined one or more sound signals corresponding to non-speech including silence, noise and tones into codes by said second speech coding scheme, and pre-storing the codes encoded by said second speech coding scheme; and (D) stopping to input said first code sequence, generating said second code sequence by reading said pre-stored codes corresponding to a value based on the discrimination result, and outputting the generated second code sequence, when the discrimination result indicates the non-speech part. 8. The method as claimed in claim 1 , wherein said first speech coding scheme and said second speech coding scheme are identical.