The present disclosure in some embodiments provides a transmit data structure and a communication method using the same, which can minimize the loss of the transmit data during the transmission and reception of the transmit data by optical camera communication.

The present disclosure in some embodiments provides a transmit data structure and a communication method using the same, which can minimize the loss of the transmit data during the transmission and reception of the transmit data by optical camera communication.

A wireless transmitting method comprising: obtaining a first-spread-spectrum-signal (SS1-signal); producing a doubly-spread-spectrum-signal (SS2-signal) from the SS1-signal utilizing a spreading-sequence out of at least one spreading-sequence; modulating the SS2-signal to a Radio-Frequency SS2-signal (RF-SS2-signal); and transmitting the RF-SS2-signal.

A power circuit substantially canceling ripples at the source. The power circuit includes a switching circuit configured to control a power flow between an input and an output, a main storage element electrically connected in series with the switching circuit, and a resonant tank electrically coupled to the switching circuit and configured to compensate for switching ripples in the main storage element. Aspects of the invention can be applied to a converter circuit or to an inverter circuit.

A power circuit substantially canceling ripples at the source. The power circuit includes a switching circuit configured to control a power flow between an input and an output, a main storage element electrically connected in series with the switching circuit, and a resonant tank electrically coupled to the switching circuit and configured to compensate for switching ripples in the main storage element. Aspects of the invention can be applied to a converter circuit or to an inverter circuit.

Audio content in a single-bit audio stream can be reproduced at a transducer by mapping the single-bit audio stream to symbols in a multi-bit audio stream. Volume control may be implemented, in part, in the digital domain and, in part, in the analog domain. In the digital domain, when converting the single-bit audio stream to a plurality of symbols, the plurality of symbols is selected based, at least in part, on audio content of the single-bit audio stream and a desired volume level. In the analog domain, when converting an analog current signal output from a current-steering DAC processing the plurality of symbols to an analog voltage signal, an analog gain value may be selected based, at least in part, on the desired volume level.

A single-bit audio stream can be converted to a modified single-bit audio stream with a constant edge rate while maintaining a modulation index of the original audio stream using direct mapping. With direct mapping, a pre-filter bank may be combined with a multi-bit symbol mapper to select symbols for the modified audio stream with a constant edge rate per symbol and the same modulation index as the original audio stream. The output of the pre-filter bank may be an audio stream with no consecutive full-scale symbols. Using the output of the pre-filter bank, a multi-bit symbol mapper may use the symbol selector to output a symbol with a constant edge rate per symbol and the same modulation index as the original signal. The symbols may be converted to an analog signal for reproduction of audio content using a transducer.

A method and system for controlling electrical devices, such as lights capable of emitting different colours or colour sequences (shows). A multi-field command protocol is proposed to transmit command messages from a line controller to a controllable electrical device (light) to control its mode of operation, and optionally at least one dimension associated with the mode (e.g. light colour, and brightness and/or colour saturation, or blending colour show and speed of changing colours). The protocol comprises brief interruptions to the power supplied to the electrical device comprising a first variable length OFF time, a variable length ON time following the first OFF time, and a second variable length OFF time following the ON time. Together these times form three information fields having values represented by their respective lengths/durations. The fields define a selected mode of operation of the electrical device, and optionally at least one dimension associated with the mode.

Embodiments of methods and systems for BMC decoding are described. In an embodiment, a method for BMC decoding involves performing a unit interval estimation of a BMC encoded bit stream, locating a bit boundary of the BMC encoded bit stream based on the unit interval estimation and a known sequence in a preamble of the BMC encoded bit stream, and measuring a time duration across multiple bit transitions from the bit boundary and decoding the BMC encoded bit stream based on the time duration and the unit interval estimation.

Embodiments of methods and systems for BMC decoding are described. In an embodiment, a method for BMC decoding involves performing a unit interval estimation of a BMC encoded bit stream, locating a bit boundary of the BMC encoded bit stream based on the unit interval estimation and a known sequence in a preamble of the BMC encoded bit stream, and measuring a time duration across multiple bit transitions from the bit boundary and decoding the BMC encoded bit stream based on the time duration and the unit interval estimation.