Abstract: A signal processor for 1-bit signals comprises a fifth order Delta-Sigma Modulator (DSM) having an input for receiving a 1-bit signal and an output at which a processed 1-bit signal is produced by a quantizer. The quantizer receives a p-bit signal from a series of five signal integration stages. Each stage comprises a first 1-bit multiplier coupled to the input, a second 1-bit multiplier coupled to the output, an adder which sums the outputs of the coefficient multipliers and an integrator which integrates the output of the adder. A final stage comprises a coefficient multiplier and an adder. The adder sums the output of the coefficient multiplier and the output of the integrator of the preceding integration stage. The coefficients are chosen to provide an overall attenuation of the input signal and of the quantization noise produced by the quantizer. Reduction of quantization noise allows several DSMs to be connected in series by preventing the build-up of excess noise, which may compromise stability.

Abstract: A method for producing soundtracks and background music tracks, for recreational purposes, in places such as discotheques and the like, comprising the steps of: combining together a plurality of sounds taken from a plurality of groups of sounds, each group grouping mutually compatible sounds, so as to obtain combinations of sounds; and arranging in a given sequence the combinations of sounds, so as to obtain a composition of sounds in which duration and volume can be adjusted by the user.