Audio coding with partial encryption

The invention claims a code bit stream (a) comprises a aural signal parameter configuration in time to code (x) is the aural signal. A device for parameter unit comprises a ring are sinusoidal quantity (CS paths), a device which is linked with a differential mode according to the determining ring network parameter then and differential coding. The encoder by calling function to the differential value (CSe) is the partial reflection value and/or the amplitude to coding with the frequency time to harass (18). Further provided with values, a bit stream position of the decoding path is obtained with a random frequency and/or the vibration amplitude exchange. Therefore, the signal to a coat.