Radio transmitting and receiving circuits of a video camera having a detached view finder

• US 5,179,446 A
• Filed: 10/22/1991
• Issued: 01/12/1993
• Est. Priority Date: 10/22/1991
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Hong, Kwon-pyo
• Primary Examiner(s): Razavi, Michael T.
• Assistant Examiner(s): Ho, Tuan V.
• Application Number:
  US07/780,242
• Time in Patent Office: 448 Days
• Field of Search: 358/210, 358/224, 358/209, 358/164, 358/93, 354/82, 354/81, 354/219, 354/223
• US Class Current: 348/333.07
• CPC Class Codes: H04N 23/63 by using electronic viewfinders
• CPC Class Codes: H04N 23/661 Transmitting camera control signals through networks, e.g. control via the Internet
• CPC Class Codes: H04N 5/775 between a recording apparatus and a television receiver
• CPC Class Codes: H04N 7/0887 for the transmission of programme or channel identifying signals

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.

Claims

1. 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.

2. The circuit of claim 1, 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 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 signal by adding the second gate signal to the encoded signal.

3. 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.

4. The circuit of claim 3, wherein said code means comprises:

a code generator generating the recognition code using digits 0 through 9 input through said keypad by the user; and

an encoder encoding said recognition code from said code generator into the encoded signal.

5. 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.

6. The circuit of claim 5, 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 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; and

a second gate circuit providing the code signal by gating an inverted said predetermined horizontal synchronizing signal and said processed video signal.

7. 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.

8. The circuit of claim 7, wherein said decoding means comprises:

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.