Patent ID: 7756233
Filing Date: 2010-07-13
Classification: H04J,H04N

Abstract:
1. A data receiving device for receiving packet data through a transmission path and outputting the packet data in accordance with time information added beforehand to the packet data, the data receiving device comprising: a storage means for storing the received packet data; and a control means for separating the time information added to the received packet data and reading the packet data from the storage means in accordance with the separated time information; wherein when the control means generates a read timing, the control means calculates a clock frequency deviation between a data sending device and the data receiving device in accordance with an integration result of an amount of the received packet data temporarily stored in the storage means and a measurement result of the integration time, and adds an offset amount based on the deviation to the read timing of the received packet data, thereby generating the read timing of the received packet data; wherein when the control means calculates the clock frequency deviation between the data sending device and the data receiving device and generates the read timing of the received packet data, the control means calculates a target value by dividing the integration result of the amount of the received packet data written in the storage means in a predetermined period from a beginning of receiving of the packet data, by an average receiving rate of the received packet data in an integration time, calculates a measurement value by dividing the integration result of the amount of the received packet data written in the storage means after the predetermined period, by the average receiving rate of the received packet data in the integration time, and sets a difference between the target value and the measurement value as the clock frequency deviation.