Abstract: The present disclosure provides a video encoding circuit and a wireless video transmission apparatus and method. The wireless video transmission apparatus includes a wireless transmitter circuit and a video encoding circuit. The wireless transmitter circuit is configured to transmit a video stream with a bit rate to a wireless transmission channel and provide a transmission state message according to a transmission state of the wireless transmission channel. The video encoding circuit is coupled to the wireless transmitter circuit to receive the transmission state message. The video encoding circuit is configured to perform an encoding operation on video data to generate the video stream to the wireless transmitter circuit and dynamically adjust the bit rate of the video stream delivered to the wireless transmitter circuit according to the transmission state message.

Abstract: The present invention provides a preparation method of deglycosylated ginsenosides, which uses the supercritical fluid technology to conduct the deglycosylation of ginsenosides extract in supercritical solvent under preset pressure and temperature conditions. Under the same operational conditions, the deglycosylated ginsenosides extract and solvent at supercritical state are input into an adsorption tank at the preset volume flow rate ratio for the adsorption of ginsenosides. Then, the adsorbed ginsenosides are applied with gradient eluent by using the ethanol solution. Finally, the pressure is lowered for the separation and purification of ginsenosides to get the deglycosylated ginsenosides of high concentration.

Abstract: The present invention provides a preparation method of deglycosylated ginsenosides, which uses the supercritical fluid technology to conduct the deglycosylation of ginsenosides extract in supercritical solvent under preset pressure and temperature conditions. Under the same operational conditions, the deglycosylated ginsenosides extract and solvent at supercritical state are input into an adsorption tank at the preset volume flow rate ratio for the adsorption of ginsenosides. Then, the adsorbed ginsenosides are applied with gradient eluent by using the ethanol solution. Finally, the pressure is lowered for the separation and purification of ginsenosides to get the deglycosylated ginsenosides of high concentration.