Patent ID: 7228150
Filing Date: 2007-06-05
Classification: H04N

Abstract:
1. A portable wireless communication system having a microphone, a speaker, a transmission/reception antenna, the communication system comprising: a video mode switch for selecting a desired one of X, N and R modes; a video signal control circuit for transferring a video signal from a camera circuit to a display circuit in the N mode, a video signal from a remote terminal, received through the antenna and a transmission/reception circuit, to the display circuit in the R mode and the video signal from the camera circuit to the display circuit and transmission/reception circuit and a video transmission on command signal to a transmission on/off control circuit in the X mode; the display circuit applying an output video signal from the video signal control circuit to a display to reproduce an image picked up by a camera; the camera circuit converting an image incident on a camera lens into an electrical video signal, adjusting the level of the electrical video signal according to the amount of light sensed by an optical sensor in such a manner that the electrical video signal can appropriately be viewed on the display and outputting the resultant video signal to the video signal control circuit, the camera circuit storing a still image of one shot focused on the camera lens in a video memory and outputting the stored still image to the video signal control circuit, if a still image switch is turned on, and outputting a moving image focused on the camera lens to the video signal control circuit if the still image switch is turned off; an audio signal control circuit for transferring an audio signal from the microphone to the transmission/reception circuit and outputting an audio transmission on command signal to the transmission on/off control circuit, if an audio transmission switch is turned on, and transferring an audio signal from the transmission/reception circuit to the speaker if the audio transmission switch is turned off; a channel selection switch for selecting a frequency for transmission/reception of the video and audio signals; the transmission/reception circuit modulating an amplified video signal or audio signal from the video signal control circuit or audio signal control circuit into a radio frequency signal at the frequency selected by the channel selection switch, transmitting the modulated radio frequency signal to the remote terminal through the antenna, receiving a radio frequency signal from the remote terminal through the antenna at the frequency selected by the channel selection switch, demodulating the received radio frequency signal into an audio signal or video signal, amplifying the demodulated audio signal or video signal and transferring the amplified audio signal or video signal to the audio signal control circuit or video signal control circuit; and the transmission on/off control circuit driving a video transmitter in the transmission/reception circuit in response to the video transmission on command signal from the video signal control circuit, changing the transmission/reception circuit to a video reception mode in response to the presence of no video transmission on command signal from the video signal control circuit, driving an audio transmitter in the transmission/reception circuit in response to the audio transmission on command signal from the audio signal control circuit and changing the transmission/reception circuit to an audio reception mode in response to the presence of no audio transmission on command signal from the audio signal control circuit.