Arkamys

Thomas Esnault

Frédéric Amadu

Alexandre Fenieres

Damien Jacquet

Alexandre Senieres

A method for reducing parasitic vibrations of a loudspeaker environment while maintaining the perception of the low frequencies of an original electric sound signal for broadcast after processing by the loudspeaker having a cut-off frequency. A vibration frequency band is identified that causes the loudspeaker to vibrate. A low frequency band of the original sound signal having a frequency close to the cut-off frequency of the loudspeaker is identified as an upper limit. At least one harmonic signal from the isolated low frequency band of the original sound signal is generated. The original sound signal and the harmonic signal are combined to obtain a recombined signal. The vibration frequency band is removed from the recombined signal to obtain a signal for broadcast by the loudspeaker.

Method for reducing parasitic vibrations of a loudspeaker environment and associated processing device

A method of generating left (Ls) and right (Rs) sound signals known as 'surround' signals from a stereo sound signal composed of a left sound signal and of a right sound signal. One of the stereo signals is subtracted from the other signal with the aid of a subtraction module to obtain a single subtraction signal (LR) in which the correlated and in-phase components of the stereo signals (L, R) have been removed. A right sound signal (Rs) and a left sound signal (Ls) are generated from the subtraction signal (L&#x2212;R), these signals being decorrelated with respect to one another and corresponding respectively to the right and left sound 'surround' signals. These &#x201c;surround&#x201d; signals (Ls, Rs) intend for broadcast on the rear channels of an acoustic system.

Method of generating left and right surround signals from a stereo sound signal

A method for encoding and decoding a digital audio signal composed of an original right-hand signal (S) and an original left-hand signal (S). The method combines the original right-hand signal (S) and the original left-hand signal (S) to obtain a single combined signal (S), encodes the combined signal (S) using a standard encoder to obtain a compressed combined signal (S), and decodes the compressed combined signal (S) using a standard decoder () to obtain a decompressed combined signal (S). After decoding, the method generates a reconstructed right-hand signal (S) and a reconstructed left-hand signal (S) from the decompressed combined signal (S), which are de-correlated from each other. Also, a treble-generating module enables the high-frequency component (S) of the right-hand (S) or left-hand (S) signals to be recreated, which signals had been deleted as a result of the compression.

Method for encoding/decoding an improved stereo digital stream and associated encoding/decoding device

A method and device for normalizing the power of an electrical signal, referred to as an original sound signal S. The method detects the envelope of the original sound signal Sand compares the power value of the envelope signal Swith a threshold value K. The gain signal Sis calculated in accordance with the comparison and smoothed to obtain a smoothed gain signal S. The original sound signal Sis delayed by a delay T. The smoothed gain signal Sis applied to the delayed original sound signal Sto obtain a normalized sound signal S. The method is suitable for a source including a plurality of channels.

Method for normalizing the power of a sound signal and associated processing device

A method of optimizing stereo reception for an analog radio by applying the demodulated right sound signal (SD) and left sound signal (SG) as input to a decorrelation module having a variable decorrelation rate. The decorrelation rate of the decorrelation module is modified as a function of the reception quality coefficient 'alpha' provided by the radio. The decorrelation module applies a higher decorrelation rate for a smaller reception quality coefficient 'alpha' and applies a lower decorrelation rate for a larger reception quality coefficient &#x201c;alpha. Also, a module for generating high-pitched sounds to recreate the high-frequency component (SHF) of the right or left sound signals which has been removed in the event of poor reception.

Growing community of inventors

Paris, France

Thomas Esnault