The present disclosure relates to an audio data transmission method and apparatus. The method includes: determining a frequency of sampling of audio data to be processed as a clock frequency of a first clock signal; determining a clock frequency of a second clock signal according to the clock frequency of the first clock signal, a number of slots of the audio data to be processed and a preset audio data occupying bit width; determining a duration of a high level in each cycle of the first clock signal according to the clock frequency of the second clock signal and the number of slots; and outputting the processed audio data according to a pulse code modulation (PCM) timing determined by the clock frequency of the first clock signal, the clock frequency of the second clock signal and the duration of the high level in each cycle of the first clock signal.

There is disclosed in one example an integrated circuit, including: a network protocol circuit to provide communication via a network protocol; a network communication terminal having a configurable impedance; and a control circuit including a control input port, and circuitry to adjust the impedance of the network communication terminal responsive to an input signal.

The embodiments herein disclose an apparatus and method developed for the direct application in data transmission between the user devices with computational power, without requiring an additional hardware or any other connectivity. The method comprises the following steps of receiving a digital data and a carrier signal as input; encoding the digital data into digital acoustic signal; transmitting the digital acoustic signal; capturing the acoustic signal by the microphone; demodulating the acoustic signal and decoding the digital sound data for recovering the original data.

The embodiments herein disclose an apparatus and method developed for the direct application in data transmission between the user devices with computational power, without requiring an additional hardware or any other connectivity. The method comprises the following steps of receiving a digital data and a carrier signal as input; encoding the digital data into digital acoustic signal; transmitting the digital acoustic signal; capturing the acoustic signal by the microphone; demodulating the acoustic signal and decoding the digital sound data for recovering the original data.

Device, system and method of securely transmitting information from a mobile device or application or a user device to a mobile phone or other acoustic aware devices using audio frequency encoded data and security token transmission.

Device, system and method of securely transmitting information from a mobile device or application or a user device to a mobile phone or other acoustic aware devices using audio frequency encoded data and security token transmission.

The present technology relates to a signal processing apparatus, a signal processing method, and a program that can smoothly switch and reproduce a DSD signal and a PCM signal. A communication unit acquires a PCM signal and a DSD signal. A PCM upsampling unit upsamples the PCM signal to a sampling frequency of the DSD signal. An LPF removes a high-frequency component of the DSD signal. A correlation analysis unit analyzes a correlation between the DSD signal from which a high-frequency component has been removed and the PCM signal after upsampling, and detects a delay amount. A crossfade unit adjusts timing of the DSD signal and the PCM signal after upsampling by using the detected delay amount, and crossfades the DSD signal and the PCM signal after upsampling. The present technology can be applied, for example, to a system that acquires and reproduces audio data, or the like.

An apparatus for generating an output signal, may comprise a signal path having an analog signal path portion having an analog magnitude droop, a digital signal path portion having a digital magnitude droop, a digital-to-analog converter for converting the digital input signal into the analog signal, a first digital compensation filter that compensates for the analog magnitude droop, and a second digital compensation filter that compensates for the digital magnitude droop, such that the first digital compensation filter and the second digital compensation filter together compensate for magnitude droop of the signal path to ensure a substantially flat passband response of the signal path. An apparatus may include a delta-sigma modulator for quantization noise shaping of a digital signal, a digital-to-analog converter configured to generate an analog signal from the digital signal, and an amplifier configured to amplify the analog signal and powered from a charge pump, wherein the charge pump is configured to operate at a switching frequency approximately equal to a zero of a modulator noise transfer function of the delta-sigma modulator, such that the impact of charge pump noise on a total harmonic distortion noise of the apparatus is minimized.

Aspects disclosed in the detailed description include packetizing encoded audio frames into compressed-over-pulse code modulation (PCM) (COP) packets for transmission over PCM interfaces. In one aspect, a COP packetizing circuit is configured to receive an encoded audio frame generated from a PCM frame, and generate a COP packet that includes the encoded audio frame irrespective of the audio format. The COP packet is generated with a packet length proportional to a PCM length of the PCM frame, allowing the COP packetizing circuit to transmit the COP packet over an isochronous PCM interface with a lower bit rate than the PCM frame to reduce power. The COP packetizing circuit provides a mobile computing device with a single packetizing scheme that supports multiple audio formats, and allows for reducing power through bit rate scaling.

Aspects disclosed in the detailed description include packetizing encoded audio frames into compressed-over-pulse code modulation (PCM) (COP) packets for transmission over PCM interfaces. In one aspect, a COP packetizing circuit is configured to receive an encoded audio frame generated from a PCM frame, and generate a COP packet that includes the encoded audio frame irrespective of the audio format. The COP packet is generated with a packet length proportional to a PCM length of the PCM frame, allowing the COP packetizing circuit to transmit the COP packet over an isochronous PCM interface with a lower bit rate than the PCM frame to reduce power. The COP packetizing circuit provides a mobile computing device with a single packetizing scheme that supports multiple audio formats, and allows for reducing power through bit rate scaling.