Exhibit 23.01 The Board of Directors Lernout & Hauspie Speech Products N.V. We consent to the incorporation by reference in the Registration Statement on Form S-8, with respect to 4,647,113 shares of Common Stock of Lernout & Hauspie Speech Products N.V., of our report dated April 9, 1999 relating to the consolidated balance sheets of Lernout & Hauspie Speech Products N.V. and subsidiaries as of December 31, 1997 and December 31, 1998, and the related consolidated statements of operations, stockholders' equity, and cash flows for each of the years in the three-year period ended December 31, 1998, which report appears in the December 31, 1998 annual report on Form 20-F of Lernout & Hauspie Speech Products N.V. filed on June 30, 1999. Brussels, Belgium June 13, 2000 /s/ Klynveld Peat Marwick Goerdeler Bedrijfsrevisoren - ----------------------------------------------------- Klynveld Peat Marwick Goerdeler Bedrijfsrevisoren 1