5 results about "Pulse-code modulation" patented technology

In some aspects, an electronic device can receive multiple tactile signals associated with multiple tactile events, wherein the multiple tactile events overlap in the time domain. The electronic device can generate a hybrid tactile signal that combines the multiple tactile signals in the mechanical acceleration domain, wherein the hybrid tactile signal stores timing or synchronization information associated with the multiple tactile signals. The electronic device can generate an output stream to be provided to a tactile actuator, wherein the output stream includes a pulse code modulation (PCM) voltage signal based on the hybrid tactile signal combining the multiple tactile signals. Numerous other aspects are described.

A dual-layer optical encryption fluorescent polymer waveguide chip based on optical pulse code modulation technology belongs to the field of functional photonic chip technology. It consists of a substrate layer, a buffer layer, a cladding layer, a bottom waveguide layer, and a top waveguide layer. The cladding layer is divided into three parts: a lower cladding layer, a middle cladding layer, and an upper cladding layer. The bottom waveguide is located within the middle cladding layer, and the top waveguide is located within the upper cladding layer. The bottom and top waveguides do not overlap in the chip's top-view plane. The waveguide layer material is obtained by doping fluorescent small-molecule oligomer chromophores into a polymer material. This invention achieves signal optical pulse coding by modulating the pump light power intensity. By detecting changes in optical transmission loss in the fiber optic system, it determines whether eavesdropping has occurred. Eavesdropping is indicated by optical transmission loss exceeding a threshold. False information is displayed in the bottom waveguide for disguise, while the modulated information is transmitted encrypted through the top waveguide, thus solving the problems of limited controllability and insufficient security in traditional encryption technologies.

The application provides an audio data processing method and device for sound wave communication and a storage medium, which comprises the following steps: obtaining initial communication text to be sent, and performing encoding processing on the initial communication text to determine the encoding data corresponding to the initial communication text; the encoding data comprises at least one of check bit data and error correction code data corresponding to the initial communication text; performing frequency conversion on the encoding data to determine the frequency data corresponding to the encoding data; performing audio generation processing on the frequency data by using a pulse code modulation mode and a sine wave function to determine the audio data corresponding to the frequency data; the audio data comprises multiple syllables, and the volume change trend of each syllable from the beginning to the end is first large and then small; the audio data is sent to a receiving end device; and the audio data is used to enable the receiving end device to decode the audio data and then perform sound wave communication. The technical scheme can improve the success rate of sound wave communication.

An image encoding / decoding method and apparatus are provided. An image decoding method according to the present disclosure may include parsing, from a bitstream, first information specifying whether block difference pulse code modulation (BDPCM) applies to an intra-predicted current block, determining a prediction direction of BDPCM for the current block and generating a residual block of the current block based on the determined prediction direction of BDPCM, based on the first information specifying that BDPCM applies to the current block, generating a prediction block of the current block, by performing intra prediction based on an intra prediction mode of the current block, and reconstructing the current block based on the residual block and the prediction block.

A video decoding method performed by a decoding device according to the present document is characterized by comprising the steps of: acquiring a BDPCM availability flag regarding whether Block-based Delta Pulse Code Modulation (BDPCM) is available for a chroma block and a luminance block; acquiring a BDPCM luminance flag regarding whether BDPCM is applied to a current luminance block based on the BDPCM availability flag; and acquiring a BDPCM chroma flag regarding whether BDPCM is applied to current chroma blocks based on the BDPCM availability flag.