Acoustic apparatus comprising: - a first microphone, the first microphone having a main electroacoustic transducer capable of receiving acoustic sound waves of a sound signal coming from the vocal cords and of converting said acoustic waves into a first electrical signal, - a second microphone, the second microphone having a transducer for osseous mechanical excitation capable of receiving by bone conduction vibratory oscillations of said sound signal and of converting said vibratory oscillations into a second electrical signal, - means for calculating a corrected electrical signal (Sc) as a function of the first electrical signal and of the second electrical signal, the corrected electrical signal (Sc) being capable of being delivered at the output of the acoustic apparatus, - a noise reduction device, the noise reduction device being connected at the output of the main electroacoustic transducer in order to reduce the noise in the first electrical signal and the calculation means being connected, on the one hand, at the output of the noise reduction device and, on the other hand, at the output of the transducer for osseous mechanical excitation, the noise reduction device having a third microphone and first means for determining a first corrected intermediate signal, the third microphone having a secondary electroacoustic transducer capable of receiving acoustic sound waves of an ambient noise and of converting said acoustic waves into a third electrical signal, the first corrected intermediate signal being a function of the first electrical signal and of the third electrical signal, the first corrected intermediate signal satisfying the following equation: Int 1 = E 1 − E 3 where E1 represents the first electrical signal and E3 represents the third electrical signal, the noise reduction device having means for determining a second corrected intermediate signal as a function of the first corrected intermediate signal and of the second signal, the determination means being connected at the output of the first determination means and the corrected electrical signal (Sc) then being a function of the second corrected intermediate signal, characterised in that the second corrected intermediate signal satisfies the following equation: Int 2 = Int 1 − E 2 wherein Int1 represents the first corrected intermediate signal and E2 represents the second electrical signal. - a first microphone, the first microphone having a main electroacoustic transducer capable of receiving acoustic sound waves of a sound signal coming from the vocal cords and of converting said acoustic waves into a first electrical signal, - a second microphone, the second microphone having a transducer for osseous mechanical excitation capable of receiving by bone conduction vibratory oscillations of said sound signal and of converting said vibratory oscillations into a second electrical signal, - means for calculating a corrected electrical signal (Sc) as a function of the first electrical signal and of the second electrical signal, the corrected electrical signal (Sc) being capable of being delivered at the output of the acoustic apparatus, - a noise reduction device, the noise reduction device being connected at the output of the main electroacoustic transducer in order to reduce the noise in the first electrical signal and the calculation means being connected, on the one hand, at the output of the noise reduction device and, on the other hand, at the output of the transducer for osseous mechanical excitation,