Patent ID: 7263110

Claim:
A network system comprising a server device for transmitting audio information or video information and a client device for receiving the audio information or the video information transmitted from said server device, wherein said server device counts the number of clock pulses of a server clock signal used to encode the audio information or the video information on the basis of a power source synchronous pulse signal synchronized with the power source frequency of electric power supplied to the server device, and outputs information showing the counted clock pulse number to the client device; and said client device receives the information showing the clock pulse number transmitted from said server device, and counts the number of clock pulses of a client clock signal used to decode the audio information or the video information on the basis of a power source synchronous pulse signal synchronized with the power source frequency of electric power supplied to the client device, and the frequency of said client clock signal is conformed to the frequency of said server clock signal on the basis of the difference between the clock pulse number received from said server device and the counted clock pulse number.