Abstract: Multimedia codecs (compression methods), based only on FFT (Fast Fourier Transform) have been recently proposed. These codecs use the largest points (foreground) and the most energetic bands (background). Medium quality versions are based on the largest local peaks only. The phases can be ignored with the largest local peaks or in the background. Alternatively, sine and cosine amplitudes can be used. This invention describes methods for giving utility to the reintroduced phases, in particular: local peaks are grouped to have a very narrow bandwidth, with the phases containing the displacements of these peaks, and we transport data and the points of the foreground in the phases of the background. High speed communications are supported using techniques similar to OFDM (Orthogonal Frequency-Division Multiplexing). These processes are intended to be used in particular with connected objects and in the physical layers of computer networks.

Abstract: Multimedia codecs (compression methods), based only on FFT (Fast Fourier Transform) have been recently proposed. These codecs use the largest points (foreground) and the most energetic bands (background). Medium quality versions are based on the largest local peaks only. The phases can be ignored with the largest local peaks or in the background. Alternatively, sine and cosine amplitudes can be used. This invention describes methods for giving utility to the reintroduced phases, in particular: local peaks are grouped to have a very narrow bandwidth, with the phases containing the displacements of these peaks, and we transport data and the points of the foreground in the phases of the background. High speed communications are supported using techniques similar to OFDM (Orthogonal Frequency-Division Multiplexing). These processes are intended to be used in particular with connected objects and in the physical layers of computer networks.

Abstract: Audio codec using the Fast Fourier Transform, the partial overlap and a decomposition in two plans based on the energy. The present invention concerns a method of audio compression and decompression, simple, of high quality, not requiring a lot of computations and allowing to obtain very high compression ratios. This codec is optimized for both the voice and the music. The most spread methods nowadays use the Linear Predictive Coding (LPC) in the time domain for the voice and the Modified Discrete Cosine Transform (MDCT) in the frequency domain for the music. The present codec uses the Fast Fourier Transform (FFT). The Fast Fourier Transform buffers are split into a forward plan (composed only of the biggest points) and a backward plan (composed of the most energetic bands). The non null points in the bands are composed only of points not taken into account in the forward plan.