Wideband speech coding (0 to 7 kHz) finds a broad range of applications in modern telecommunication systems such as video-phone and teleconferencing. The quality obtained with the standard G722 of CCITT is sufficient, but the bit-rate (64 kbits/s) is too high. Recently, transform coding has made great performances in high-fidelity transmission of audio signals (Brandenburg & al., 1991). This technique has prompted us to use it for wideband speech coding. In order to obtain a good quality of coded speech, the voiced/unvoiced (V/UV) nature of speech has been taken into account at each stage of the algorithm development. In this paper, a fixed bitrate coder at 32 kbits/s and a variable bit-rate one with a mean bit-rate of 24 kbits/s are presented. Evaluation results about the subjective quality of the two coders are given.