Exhibit 23.04 CONSENT OF INDEPENDENT AUDITOR We consent to the incorporation by reference in the registration statement on Form S-3 with respect to 10,011,236 shares of Common Stock of Lernout & Hauspie Speech Products N.V. of our report dated September 2, 1999, with respect to the financial statements of Brussels Translation N.V. included in Form 6-K of Lernout & Hauspie Speech Products N.V. filed with the Securities and Exchange Commission on September 9, 1999. Gent, Belgium June 27, 2000 Ernst & Young Reviseurs d'Enterprises SCC (B 160) /s/ Marc Cosaert - ---------------- Marc Cosaert, Partner E-1