35results about How to "Avoid decoding errors" patented technology

The invention relates to a video encoding and decoding method which is used in a video communication system, wherein the predictive encoding type and reference frame type of a video encoding device are controlled according to the network state and a notice message of a video decoding device. When a network is congested, the video encoding device utilizes a reference frame as a long-term reference frame to perform interframe prediction encoding and judges whether the video decoding device receives the corresponding reference frame according to the notice message of the video decoding device, thus the video encoding device and the video decoding device can utilize the same reference frame. The invention also provides the video encoding device and video decoding device which are used in the method in the invention. The video encoding and decoding method, video encoding device and video decoding device provided by the invention are used to encode and decode a video image by determining the long-term reference frame, thus the video encoding device and the video decoding device can utilize the same reference frame, the decoding error phenomenon caused by packet loss can be avoided and the quality of the video image in video communication can be increased.

The invention discloses a method and a system for acquiring a memory resource of an audio and video hard decoding chip. The method comprises the following steps that: a main control central processing unit (CPU) calculates a forecast memory resource required value of the audio and video hard decoding chip; the audio and video hard decoding chip calculates a required memory resource required value; the main control CPU compares the two values to acquire a maximum memory resource required value of the two values, and compares the maximum memory resource required value with an assignable maximumvalue of a system memory; if the maximum memory resource required value is smaller than the assignable maximum value of the system memory, the main control CPU transmits the maximum memory resource required value to the audio and video hard decoding chip; and the audio and video hard decoding chip transmits a memory resource acquiring requirement to an operating system. By the method and the system, the problems of decoding error or abnormity caused by wrong calculation of the memory resource requirement of the audio and video hard decoding chip can be avoided, and the playback quality of audio and video files is enhanced.

The invention provides a signal capture method and device and a USB key. The signal capture method and device and the USB key are suitable for the technical field of voice communication. The method includes the steps that data streams sent by a mobile terminal are received, wherein the data streams include audio analog signals with different starting phase types; a rising edge capture mode and a falling edge capturing mode are started at the same time, synchronous heads in the audio analog signals are captured through the rising edge capturing mode, the captured synchronous heads are converted to generate first synchronous codes, the synchronous heads in the audio analog signals are captured through the falling edge capturing mode, and the captured synchronous heads are converted to generate second synchronous codes; whether the generated first synchronous codes and a preset synchronous node are the same or not is detected, if yes, the rising edge capturing mode is configured to capture the audio analog signals, or whether the generated second synchronous codes and the preset synchronous node are the same or not is detected, if yes, the falling edge capturing mode is configured to capture the audio analog signals.

A data transmission method and a communication device, which can be applied to scenarios such as Internet of Vehicles, unmanned driving, smart grids, and smart cities. The method includes: the sending device concatenates each data unit included in the transport block according to the transport block attribute information of the transport block to be sent, the sending device sends the transport block after the data units are concatenated, and the transport block attribute information includes the current value of the transport block The number of times or redundant versions that have been sent, and the data unit is a coded block or a set of coded blocks. In this way, when the number of times the transmission block has been sent or the redundancy version is changed, the concatenation sequence between the data units is also changed accordingly, which can play the role of diversity to a certain extent, so that the same coding block can be used in different During the transmission process, the degree of interference or damage is also different, which effectively improves the retransmission efficiency and decoding performance.

Disclosed in the invention is a demodulation circuit of a non-contact IC card. The demodulation circuit comprises a comparator, a bias circuit and a logic control circuit. The input terminal of the logic control circuit is connected with a clock signal and a demodulation signal outputted by the comparator and the logic control circuit outputs a control signal to the bias circuit. The logic control circuit starts to output an eight-clock period high level at a rising edge when a groove signal of the demodulation signal is converted into a high level and the driving capability of the bias circuit is enhanced by the high level, so that self-adapting adjustment of the driving capability of the bias circuit based on the output of the demodulation circuit can be realized. Therefore, sensitivity of groove signal sensing in the modulated signal can be improved; and the input terminal of the demodulation circuit can be recovered rapidly after recovery of the groove signal in the modulated signal, thereby realizing correct decoding of the demodulation circuit on the full-process condition and the full-field intensity condition.