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US 5,179,446 AGranted
Radio transmitting and receiving circuits of a video camera having a detached view finder
AssigneeSamsung Electronics Co., Ltd.
InventorKwon-pyo Hong
Life of this patent
Estimating the term…
Abstract
Radio transmitting and receiving circuits are disclosed which operate wireless without interference and where the main body of a video camera is detached from the view finder. A timing controller applied to a radio transmitting circuit inserts an encoding signal into a video signal having a predetermined horizontal synchronizing signal interval. Meanwhile, a timing controller applied to a radio receiving circuit extracts the encoded video signal and supplies it to a decoder. The decoded signal is read in conjunction with a reference code signal in a code discriminator, and the received signal is displayed in the view finder only if the codes match.
Claims8
A radio transmitting circuit which is installed in a main body of a video camera having a detached view finder, said circuit comprising:
- a charge-coupled device portion providing an electrical signal by converting an image signal of an object input through a lens of said video camera;
- a preprocessor providing a preprocessed signal by performing on the electrical signal an automatic white balance control, an automatic black balance control, a flare compensation, and a gamma compensation;
- a video signal processor providing a composite video signal by performing a luminance/color difference signal process on the preprocessed signal;
- a synchronous signal separator providing vertical and horizontal synchronizing signals from the composite video signal;
- code means for providing an encoded signal, said code means comprising a code generator generating a recognition code using digits 0 through 9 input through a keypad by a user, and an encoder encoding said recognition code from said code generator into the encoded signal;
- a timing controller providing an overlapped signal by overlapping the encoded signal with the horizontal synchronizing signal during a predetermined horizontal synchronizing signal interval;
- a mixer providing a mixed signal by mixing the overlapped signal and the composite video signal;
- a modulating portion providing a modulated signal by modulating the mixed signal with a carrier of a specific frequency;
- and
- a transmitting poriton amplifying the modulated signal and transmitting the amplified signal at a radio frequency to said view finder through a transmitting antenna.
7 more elements
A radio transmitting circuit which is installed in a main body of a video camera having a detached view finder, said circuit comprising:
- a charge-coupled device portion providing an electrical signal by converting an image signal of an object input through a lens of said video camera;
- a preprocessor providing a preprocessed signal by performing on the electrical signal an automatic white balance control, an automatic black balance control, a flare compensation, and a gamma compensation;
- a video signal processor providing a composite video signal by performing a luminance/color difference signal process on the preprocessed signal;
- a synchronous signal separator providing vertical and horizontal synchronizing signals from the composite video signal;
- code means for providing an encoded signal by encoding an input by a user through a keypad;
- a timing controller providing an overlapped signal by overlapping the encoded signal with the horizontal synchronizing signal during a predetermined horizontal synchronizing signal interval, said timing controller comprising:
- a counter providing a first counter signal by counting equalizing pulses of the horizontal synchronizing signal,
- a memory storing the vertical synchronizing signal in an assigned address in response to an address signal from the counter,
- a read/write control logic portion providing a read/write control signal to the memory in dependence upon the first counter signal, to read/write the vertical synchronizing signal stored in the memory,
- a monostable multivibrator providing a multivibrator signal by a predetermined delay of the vertical synchronizing signal received from said memory,
- a first gate circuit providing a predetermined horizontal synchronizing signal by gating a second counter signal and the multivibrator signal,
- a second gate circuit providing a second gate signal by gating an inverted said predetermined horizontal synchronizing signal and said composite video signal, and
- an adder providing an encoded horizontal synchronizing pulse by adding the second gate signal to the encoded signal;
- a mixer providing a mixed signal by mixing the overlapped signal and the composite video signal;
- a modulating portion providing a modulated signal by modulating the mixed signal with a carrier of a specific frequency;
- and
- a transmitting portion amplifying the modulated signal and transmitting the amplified signal at a radio frequency to said view finder through a transmitting antenna.
14 more elements
A radio receiving circuit which is installed in a detached view finder of a video camera having a main body, said circuit comprising:
- a receiving portion providing a received signal by receiving a radio frequency signal through a receiving antenna from the main body of said video camera;
- a demodulator providing a demodulated signal by amplifying and detecting the received signal;
- a video signal processor providing a processed video signal by processing the demodulated signal;
- a synchronous signal separator providing vertical and horizontal synchronizing signals by separating the vertical synchronizing signal and the horizontal synchronizing signal from the processed video signal;
- a timing controller extracting a code signal overlapped on a horizontal synchronizing signal during a predetermined horizontal synchronizing signal interval;
- decoding means for providing a code discriminated signal by comparing and discriminating said code signal with a recognition code, said decoding means comprising:
- a code generator providing the recognition code by generating the recognition code from digits 0 through 9 input by a user through a keypad,
- a decoder providing a decoder signal by decoding said code signal, and
- a code discriminator providing the code discriminated signal by comparing and discriminating the recognition code and the decoded signal;
- a gating portion passing the processed video signal in dependence upon the decoded signal;
- and
- a display portion receiving the processed video signal from said gating portion, amplifying the processed video signal, separating a synchronizing signal from the amplified processed video signal, and displaying the amplified processed video signal on a screen of the view finder.
9 more elements
A radio receiving circuit which is installed in a detached view finder of a video camera having a main body, said circuit comprising:
- a receiving portion providing a received signal by receiving a radio frequency signal through a receiving antenna from the main body of said video camera;
- a demodulator providing a demodulated signal by amplifying and detecting the received signal;
- a video signal processor providing a processed video signal by processing the demodulated signal;
- a synchronous signal separator providing vertical and horizontal synchronizing signals by separating the vertical synchronizing signal and the horizontal synchronizing signal from the processed video signal;
- a timing controller extracting a code signal overlapped on a horizontal synchronizing signal during a predetermined horizontal synchronizing signal interval, wherein said timing controller comprises,
- a counter providing a first counter signal by counting equalizing pulses of the horizontal synchronizing signal,
- a memory storing the vertical synchronizing signal in an assigned address in response to an address signal from the counter,
- a read/write control logic portion providing a read/write control signal to be memory in dependence upon the first counter signal, to read/write the vertical synchronizing signal stored in the memory,
- a monostable multivibrator providing a multivibrator signal with a predetermined delay of the vertical synchronizing signal received from said memory,
- a first gate circuit providing a predetermined horizontal synchronizing signal by gating a second counter signal and the multivibrator signal, and
- a second gate circuit providing the code signal by gating an inverted said predetermined horizontal synchronizing signal and said processed video signal;
- decoding means for providing a first decoded signal by comparing and discriminating the code signal with a recognition code set provided by a user through a keypad;
- a gating portion passing the processed video signal in dependence upon the first decoded signal;
- and
- a display portion receiving the processed video signal from said gating portion, amplifying the processed video signal, separating a synchronizing signal from the amplified processed video signal, and displaying the amplified processed video signal on a screen of the view finder.
12 more elements
Dependencies are inferred from the claim text.