Supervisory alarm transmission and remote alarm receipt devices

Abstract: When an emergency event such as a burglar, a fire or the like that is being monitored by a supervisory alarm device takes place, the emergency even is transmitted through telephone lines in order for a remote supervisor to be able to directly watch a spot situation through a monitor (66), consisting of a supervisory alarm transmission device which comprises an alarm processing control section (10), a video data processing section (20) and a data transmitting section (30), and a remote alarm receipt device which comprises a data receipt section (40), a receipt processing control section (50) and a data processing section (60). By these arrangements, a user can take an instant countermeasure and the power consumption is minimized in a stand-by state because only the stand-by electric power is supplied to the supervisory alarm transmission deive and the remote alarm receipt device until data is received according to event occurrence sensing by each sensing section and to a data transmission indication signal.

Description: BACKGROUND OF THE INVENTION The present invention relates toa supervisory alarm device for monitoring if there is a burglar or a fire and issuing an alarm in the event of a burglar, a fire or the like, more particularly to supervisory alarm transmission and remote alarm receipt devices in which, when an emergency event such as a burglar, a fire or the like that is being monitored by a supervisory alarm device takes place, the emergency event is transmitted through telephone lines in order for a remote supervisor to be able to directly watch the spot situation at a certain time interval through a monitor. In general, a supervisory alarm device issuing a burglar alarm, a fire alarm and the like performs its monitoring by TV cameras and sensors mounted at monitoring positions where monitoring is required inside and outside of a building. Fig. 1 is a block diagram for a simple embodiment of a conventional supervisory alarm device having such a configuration that the output of a TV camera 1 for photographing on-the-spot and the output of a sensor 2 which is a voice or an alarm sensor or the like for various sensing are applied to a screen partition unit 3, and the output of the screen partition unit 3 is applied to a monitor 5 and a VCR (video cassette type recorder) 4. In such a supervisory alarm device, when a control signal generated from various sensors 2 mounted at desired places and a video signal from the camera 1 are processed by the screen partition unit 3 to perform an alarm control and are outputted to the monitor 5 and the VCR 4, a supervisor can watch the spot situations through the monitor 5 or, if there is no supervisor, recording is performed by the VCR 4 so that the situations of an event occurrence can be seen when a supervisor plays the recording back. However, the above-mentioned supervisory alarm device has a problem in that an emergency situation occurrence can not be effectively prevented because an instant countermeasure can not be taken with no instant monitoring when a supervisor is absent in case that there is no synthetic supervisory system and residing supervisor when the emergency situation, such as a burglar, a fire, or the like occurs, although an instant countermeasure can be taken with an instant monitoring of the emergency situation occurrence such as a burglar, a fire, or the like by a supervisor in case that there is a synthetic system and a residing supervisor. There is also known a supervisory alarm device having a transmission device according to the preamble of claim 1 and a receipt device according to the preamble of claim 5 (Computer Systems, Vol. 6, No. 1, Jan. 1986, Bromley, GB; pages 55-58). SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide supervisory alarm transmission and remote alarm receipt devices which enable an instant countermeasure to be taken against a burglar, a fire, or the like by allowing a remote shop owner to catch the spot situation through video at a real time at the moment that the emergency situation occurs as mentioned above at the supervisory alarm device-mounted places when a supervisor is absent but a supervisory alarm device is mounted at a shop that has a difficulty in putting a residing supervisor. The object of the present invention is attained by allowing a remote supervisor to, at a real time, catch a spot situation when an event occurs, equipped with a supervisory alarm transmission device for transmitting to the remote supervisor certain video data obtained with transacting a video signal generated from a TV camera mounted on the spot which operates when a microcomputer senses an emergency situation occurrence through various sensors, and a remote alarm receipt device for storing in memory in a supervisor's absence or displaying on a monitor in pictures the receipt of the certain video data transmitted from the supervisory alarm transmission device in response to a telephone call of the supervisory alarm transmission device. More specifically, there is provided a supervisory alarm transmission device according to claim 1 and a remote alarm receipt device according to claim 5. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the configuration of an embodiment of a conventional supervisory alarm device, Fig. 2 is a view showing the configuration of a supervisory alarm transmission device according to the present invention. Fig. 3 is a view showing the configuration of a remote alarm receipt device according to the present invention, Fig. 4 is a control flow chart according to Fig. 2, Fig. 5 is a control flow chart according to Fig. 3, and Fig. 6 is an arrangement view fo sensors and a TV camera, as an example for explaining the present invention. DETAILED DESCRIPTION OF THE INVENTION A detailed description of the present invention will be given below with reference to accompanying drawings. As shown in Fig. 2, the supervisory alarm transmission device 100 is constructed by, a sensing section 12 comprising sensors 12a, 12b, .... mounted at monitoring positions for obtaining outputs according to various sensing, such as a burglar, a fire or the like, an alarm processing microcomputer 11 for controlling the video data processing and transmission, and controlling the operating electric power of each section by controlling a power control switch SW1 which intermits the output of the power supply 16 according to an output of the sensing section 12, a key input section 13 for inputting key data to the alarm processing microcomputer 11, a clock generator 14 for generating an operating timing clock for each section, an alarm processing control section 10 consisting of a spot TV camera 15 for photographing the spot with an operating electric power supplied through said power control switch SW1, an analog/digital converter 21 for digitizing the video signal from said spot TV camera 15, a memory 23 for storing video data, a video data processing section 20 consisting of a memory controller 22 for controlling the data storage to said memory 23 and controlling the data output from said memory 23, a modulator 31 for modulating and transmitting through telephone lines L1, L2 the video data appeared from said video data processing section 20, a DTMF generator 32 for generating a dual tone multifrequency according to the control of said alarm processing microcomputer 11, a buffer 34 for buffering and sending out the outputs of said modulator 31 and DTMF generator 32 according to the control of said alarm processing microcomputer 11, a matching transformer T1 for matching to telephone lines L1, L2 and transmitting the output of said buffer 34, a tone decoder 33 for decoding and inputting to said alarm processing microcomputer 11 the tone signal received through said matching transformer T1, a transmission control switch SW2 for intermitting said telephone line L1 connected to said matching transformer T1, and a data transmitting section 30 consisting of a transmission switch driving section 35 for driving said transmission control switch SW2 accoridng to the control of said alarm processing microcomputer 11. And also, as shown in Fig. 3, the remote alarm receipt device 200 is constituted by, a receipt control microcomputer 51 for performing a control in order to receive and transact the data transmitted in response to a call from said supervisory alarm transmission device 100, a power control switch SW4 for controlling the operating electric power of each section according to the control of the receipt control microcomputer 51, a receipt processing control section 50 consisting of a clock generator 52 producing an operating timing clock, a ring signal detector 41 for detecting and inputting to said receipt control microcomputer 51 the ring signal transmitted through telephone lines L′1, L′2, a hook detector 42 for detecting and inputting to said receipt control microcomputer 51 the on/off state of the hook switch of the telephone set 47 connected to said telephone lines L′1, L′2, a matching transformer T2 for matching with and receiving the signal transmitted through said telephone lines L′1, L′2, a receipt control switch SW3 for performing a receipt control by intermitting said telephone line L′1 connected to the matching transformer T2, a receipt switch driving section 43 for driving said receipt control switch SW3 according to said receipt control microcomputer 51, an amplifier 44 for amplifying the signal received through said matching transformer T2 according to the control of said receipt control microcomputer 51, a tone decoder 46 for detecting and inputting to said receipt control microcomputer 51 the tone signal from the output signal of the amplifier 44, a data receipt section 40 consisting of a DTMF generator 45 for generating and outputting to said matching transformer T2 a DTMF generated according to the control of said receipt control microcomputer 51, a demodulator 61 for demodulating the signal generated from the amplifier 44 in the data receipt section 40 to a video signal, an analog/digital (A/D) converter 62 for digitizing the signal generated from the demodulator 61, a memory 64 for storing the digitized video data, a memory controller 63 for storing to said memory 64 and outputting the data generated from said analog/digital converter 62 according to the control of said receipt control microcomputer 51, a digital/analog (D/A) converter 65 for converting to an analog signal the video data generated from the memory controller 63, and a receipt data processing section 60 consisting of a monitor 66 for displaying as pictures the signal generated from the digitial/analog converter 65. The operations and effects of the present invention having such a configuration will be described in detail as follows with reference to the accompanying drawings of Figs. 4, 5 and 6. Fig. 4 is a control flow chart of a supervisory alarm transmission devide 100 according to the present invention. As shown in Fig. 4, an alarm processing microcomputer 11 controls the supervisory alarm transmission device 100. A user inputs a telephone number with which a remote alarm receipt device 200 is equipped to the alarm processing microcomputer 11 through a key input section 13, sets the number of times of video data storage N and a time interval T to store the video data as many random number of times as described at a random time interval so that changes in the spot situtation can be caught and sets a setup time t1 for checking a retransmission request. Thereafter, the output of the sensing section 12 which consists of sensors 12a, 12b mounted at each of monitoring positions are verified. If the sensors 12a, 12b of the sensing section 12 detect an invader, a fire or the like and then send out a sensing output, the alarm processing microcomputer 11 turns the power control switch SW1 on to drive the spot TV camera 15 and drives the video data processing section 20 and data transmission section 30 with supplying an operating electric power of the power source 16. At this time, the video signal obtained from the photographing of said spot TV camera 15 is synchronized with a clock signal of the clock generator 14, digitized through the analog/digital converter 21 and then inputted to the memory controller 22 as video data. The alarm processing microcomputer 11 controls the memory controller 22 so that photographing is performed by said spot TV camera as many as the number of times of video data converted to digital data through the analog/digital converter 21 is stored in the memory 23. And also, the alarm processing microcomputer 11 turns the transmission control switch SW2 on through the transmission switch driving section 35 to connect the matching transformer T1 to the telephone lines L1, L2 for its readiness of transmission and then calls a receipt side by generating a DTMF of the stored receipt-side telephone number through the DTMF generator 32. The tone decoder 33 detects and inputs to the alarm processing microcomputer 11 a receipt side tone signal received through the matching transformer T1 after a receipt side call. The alarm processing microcomputer 11 discriminates this. If there is a busy tone which the telephone line of the receipt side is occupied, the alarm processing microcomputer 11 makes another call for the receipt side by generating the DTMF of the receipt side telephone number again after a stand-by for a certain time, and if there is no busy tone. The alarm processing microcomputer 11 discriminate if there is a ring back tone which tells the completion of a receipt readiness of the receipt side. If there is no ring back tone because of the completion of the receipt readiness of the receipt side, the alarm processing microcomputer 11 generates a data transmission indication signal for notifying that there will be a data transmission to transmit to the receipt side, controls the memory controller 22 to read and input to the modulator 31 the video data stored in said memory 23, and controls the buffer 34 to transmit the modulated video data signal through the matching transformer T1 for a data communication from the modulator 31. And, after having transmitted the video data, the alarm processing microcomputer 11 counts said setup time T1 while waiting for a receipt side retransmission request and checks if there is th receipt side retransmission request within the setup time t1 through the tone decoder 33. if there is a retransmission request within said setup time t1, the alarm processing microcomputer 11 generates the data transmission indication signal through the DTMF generator 32, transmits the next video data in the memory and then puts in a stand-by state again for said setup time t1. If there is no retransmission request within the setup time t1, the alarm processing microcomputer 11 controls the transmission switch driving section 35 to turn the transmission control switch SW2 off. Accordingly, the data transmission is completed with making a shortcircuit between the telephone line L1 and the matching transformer T1. As mentioned above, in the event of an emergency situation occurrence such as an invader, a fire or the like, the supervisory alarm transmission device 100 mounted in the shops in which a supervisor can not reside transmits the video data photographed by the spot TV camera 15 to a remote alarm receipt device 200, and thus the remote alarm receipt device 200 receives the video data and displays it through the monitor 66 or stores it in the memory 64 in order for a supervisor to watch it. Fig. 5 is a receipt control flow chart of a remote alarm receipt device according to the present invention. Referring to this, the operation of the remote alarm receipt device 200 in Fig. 3 will be described below. First of all, the number of times of storage for receipt video data (hereinafter, referred to receipt storage times) M and the number of times of received rings (hereinafter, referred to receipt ring times) R are set in a receipt control microcomputer 51. The receipt storage times M are set for storing a certain amount of the video data received through the alarm receipt device 200 in case that there is no supervisor, and the receipt ring times R is set for deciding if an answer is made on the telephone at the receipt side. The alarm receipt device 200 goes in a stand-by state after the receipt storage times M and the receipt ring times R have been set as mentioned above. According to this, if ring signals which are transmission side telephone calls are detected through a ring detector 41, the receipt control microcomputer 51 decides if the hook switch of the telephone set 47 is turned off through a hook detector 42, that is, if a user hangs up the receiver of the telephone set 47 while counting the number of times of ring signals up to the receipt ring times R. If the telephone call is not answered within the previously set receipt ring times R, the receipt control microcomputer 51 decides the absence of a user and turns the receipt control switch SW3 on through a receipt switch driving section 43. Since turning the receipt control switch SW2 on makes a connection between a matching transformer T2 and a telephone line L′1 to cut off the ring back tone, the receipt control microcomputer 51 generates a data transmission indication signal in case that the transmission side transmits data transmission. The receipt control microcomputer 51 senses if there is a data transmission indication signal from the transmission side through the tone decoder 46 after the completion of its receipt readiness. If there is no data transmission indication signal, the receipt control microcomputer 51 turns the receipt control switch SW3 off because it is a general telephone call. However, if there is a data transmission indication signal, the receipt control microcomputer 51 turns the power control switch SW4 on to operate the receipt data processing section 60 because it is a telephone call for video data, and controls the memory controller 63 to store the received video data in the memory 64. That is, the video data which is picture data on-the-spot transmitted through the telephone lines L′1, L′2 is matched with the receipt side through the matching transformer T2, amplified at the amplifier 44, demodulated to video signal at the demodulator 61, digitized at the analog/digital converter 62 and inputted to the memory controller 63 as a video data signal. The memory controller 63 stores in the memory 64 the video data received according to the control of said receipt control microcomputer 51. At this time, the receipt control microcomputer 51 makes retransmission requests to the transmission side until the video data stored in the memory 64 is received and stored as many as the previously set receipt storage times M. The receipt control microcomputer 51 turns the receipt control switch SW3 off to end the receipt when it has received and stored the video data as many as the previously set receipt storage time M according to the retransmission requests. In the meantime, when ring signals are detected by the transmission side telephone, call if the hook switch of the telephone set is turned off within the previously set receipt ring times R, that is, if a user answers the telephone, the receipt control microcomputer 51 turns the receipt control switch SW3 on then senses it there is a data transmission indication signal through the tone decoder 46. If there is no data transmission indication signal, the receipt control microcomputer 51 turns the receipt control switch SW3 off to make only a voide communication possible through the telephone 47, and if there is a data transmission indication signal, the receipt control microcomputer 51 turns the power control switch SW4 on to supply the power supply 54 to the receipt data processing section 60. According to this, the video data which is picture data on-the-spot and which is demodulated through the demodulator 61 and digitized through the analog/digital converter 62 is inputted in the memory controller 63. Since a user answers the telephone within the previously set receipt ring times R, the receipt control microcomputer 51 controls said memory controller 63 to convert the received video data to analog signals through the digital/analog converter 65 for the monitor 66. Accordingly, the user can watch the spot situation in pictures through the monitor 66. If a supervisor wants to receive more pictures on the monitor 66, the supervisor presses the keys of the telephone set 47 to generate a retransmission tone which has been set. After receiving new spot pictures until any retransmission request is not necessary, the supervisor hangs up the receiver of the telephone set 47 to turn the hook switch on. The receipt control microcomputer 51 is awaiting until a busy tone is generated by the turn-on of the hook switch. If a busy tone is generated, the receipt control microcomputer 51 turns the receipt control switch SW3 and the power control switch SW4 off to end the receipt. Fig. 6 is an arrangement view of sensors and a spot TV camera for explaining the present invention. A first sensor 12a for sensing pressure and vibration is mounted at the window, a light-emitting element 12b1 and a light-receiving element 12bc2 are mounted at opposite sides of an exit, and a spot TV camera 15 is mounted at a position by which the window and the exit can be monitored. When the supervisory alarm transmission device 100 comprises these sensors 12a, 12b and the spot TV camera 15, the alarm processing microcomputer 11 turns the spot TV camera 15 on to start photographing the spot according to an output of the first sensor 12a which senses said pressure and vibration. At this time, if the second sensor 12b outputs its sensing output, the supervisory alarm transmission device 100 controls the video data processing section 20 to store video data and also controls the data transmitting section 30 to transmit the video data. As mentioned above, various sensors are mounted at each of the monitoring positions as a sesnsing section 12. According to the outputs of the sensors, the alarm processing microcomputer 11 operates the spot TV camera 15 and controls the video data processing section 20 and the data transmitting section 30, wherein the control procedures and timing of the microcomputer 11 depends on the programs which have been set. Accordingly, when a sensing section 12 which consists of sensors suitable for purposes of supervisory against a burglar, a fir or the like is mounted in a small-size building or a shop that a supervisor can not reside in, a supervisory alarm transmission device 100 equipped with a spot TV camera 15 is mounted in a monitoring place in order to photograph the spot, and a remote alarm receipt device 200 is mounted in user's remote premise along with interrelated program data and kept in a stand-by state, the alarm processing microcomputer 11 of the supervisory alarm transmission device 100 operates the spot TV camera according to the output of the sensing section 12 which consists of sensors to photograph the spot and stores video data through the video data processing section 20 up to the number of times of storage for received video data N set up in the memory 23 at a predetermined time interval T. And also, the alarm processing microcomputer 11 calls through the data transmitting section 30 the telephone number of user's premise which is a telephone number equipped with the remote alarm receipt device 200, transmits through the telephone lines L1, L2 the spot video data stored in said memory 23 when the receipt side has finished its readiness. If there is a retransmission request at the receipt side, the alarm processing 11 transmits new video data. If there is a telephone call at the transmission side which is the supervisory alarm tranmission device 100, the remote alarm receipt device 200 which is the receipt side receives video data in response to the telephone call when having finished its receipt readiness. The remote alarm receipt device 200 displays the received video data on the monitor 66 in order for the user to see the spot situation at a real time in case that the hook switch is turned off within the receipt ring times R, that is, in case that the user answers the telephone. At this time the user can watch the spot situation in new spot pictures by making a retransmission request in order to examine the spot situation through the spot pictures. And also, if the hook switch is not turned off within the receipt ring times R due to the absence of the user, the remote alarm receipt device 200 stores the received video data in the memory 64 after the receipt readiness has been ended, is as many as a predetermined receipt storage times M with the retransmission request. According to this, the user can play the stored video data back and watch the spot situation through the monitor 66. As described above, the present invention ha an interconnected configuration between the supervisory alarm transmission device which is mounted in buildings, shops or the like where supervision is desired and the remote alarm receipt device which is mounted in user's remote premise. According to this, since the user can watch the situations through a monitor at a real time in case of an event occurrence according to a supervisory purpose such as a burglar, a fire or the like, the present invention has an effect that a user can take an instant countermeasure as well as another effect that the power consumption is minimized in a stand-by state because only the stand-by electric power is supplied to the supervisory alarm transmission device and the remote alarm receipt device until data is received according to event occurrence sensing by each sensed section and to a data transmission indication signal.

Claims: A supervisory alarm transmission device comprising: an alarm processing control section (10) for photographing event occurrence situations when they are sensed while performing a supervision according to a supervisory purpose and for controlling the processing and transmission of the video data according to the photographing, a video data processing section (20) for converting the video output of said alarm processing control section to video data, storing said video data according to the control of said alarm processing control section and outputting the stored video data, a data transmitting section (30) for calling a receipt side over telephone lines (L1, L2), modulating the video data from said video data processing section (20) and transmitting the modulated video data through said telephone lines, and a spot TV camera (15) mounted for photographing the spot, characterized in that said alarm processing central section (10) comprises an alarm processing micro computer (11) for controlling photographing by the spot TV camera, the video data processing according to the photographing and the data transmission, with receiving the output of a sensing section (12), a key input section (13) for inputting key data to said alarm processing microcomputer, said key data comprising a telephone number with which the receipt side is equipped, and a power source switch for switching on/off the operating electric power of the power source which is supplied to said spot TV camera (15), video data processing section (20) and data transmitting section (30) according to the control of said alarm processing microcomputer (11), and in that said data transmitting section further is arranged for generating a dual tone multifrequency of the receipt side telephone number to the receipt side when having prepared for transmission of the video data with matching to the telephone lines according to the control of said alarm processing control section and inputting a receipt side response to said alarm processing control section according to the dual tone multifrequency before modulating. A supervisory alarm transmission device according to claim 1, wherein said alarm processing control section (10) further comprises a clock generator (14) for generating the operating timing clocks of said alarm processing microcomputer and video data processing section, and a sensing section mounted for sensing the event occurrence and outputting the sensed event occurrence as an output. A supervisory alarm transmission device according to claim 1 or 2, wherein said video data processing section (20) comprises: an analog/digital converter (21) for digitizing the output of the spot TV camera (15), a memory controller (22) for controlling to store the video data generated from said analog/digital converter as many as the number of times of video data storage at a predetermined time interval according to the alarm processing microcomputer (11), and for controlling the stored video data and its output, and a memory (23) for storing said video data according to the control fo the memory controller. A supervisory alarm transmission device according to claim 1, 2 or 3, wherein said data transmitting section (30) comprises: a modulator (31) for modulating the video data received from the video data processing section and transmitting the modulated video data to the telephone lines, a dual tone multifrequency generator (32) for generating a receipt side telephone number call and a data transmission indication dual tone multifrequency according to the control of the alarm processing microcomputer, a tone decoder (33) for detecting and decoding a tone signal to input the decoded tone signal to said alarm processing microcomputer, a buffer (34) for buffering the outputs of said modulator and dual tone multifrequency generator for transmission according to the control of said alarm processing microcomputer, a matching transformer (T1) for matching the output of the buffer to the telephone lines (L1, L2), a transmission control switch (SW2) for switching on/off the connection of the matching transformer and said telephone line, and a transmission switch driving section (35) for driving said transmission control switch according to the control of said alarm control microcomputer. A remote alarm receipt device comprising: a data receipt section (40) for detecting a ring signal and a hook state according to a telephone call, a receipt processing control section (50), and a data processing section (60) for storing or displaying on a screen (66) video data digitized after demodulating a video signal received through said data receipt section according to the control of the receipt processing control section, characterized in that said data receipt section (40) is arranged for detecting a tone signal after matching with and amplifying a transmission signal, and generating a retransmission request dual tone multifrequency, and said receipt processing control section (50) is arranged for controlling a ring signal, a hook state signal and a tone signal received from the data receipt section for data receipt matching and amplification, controlling a retransmission request, and for controlling to perform a data processing for the signal which the data receipt section receives. A remote alarm receipt device according to claim 5, wherein said data receipt section (40) comprises: a ring detector (41) for detecting a ring signal from telephone lines (L1′, L2′) connected to a telephone set (47), a hook detector (42) for detecting the hook switch state of said telephone set, a matching transformer (T2) for receiving the signal transmitted through said telephone lines, a receipt control switch (SW3) for switching on/off said telephone line connected to said matching transformer according to the control of a receipt switch driving section (43), an amplifier (44) for amplifying the signal received through said matching transformer, a tone decoder (46) for detecting a tone signal from the output to the amplifier, and a dual tone multifrequency generator (45) for generating a dual tone multifrequency signal of the retransmission request and the like. A remote alarm receipt device according to claim 5, wherein the receipt processing control section (50) comprises: a receipt control microcomputer (51) for controlling a receipt switch driving section (43) and an amplifier (44) with the ring signal, hook state signal and tone signal received from the data receipt section (40), controlling a dual tone multifrequency generator (45) for a retransmission request, and controlling the receipt data processing, a clock generator (52) for generating the operating timing clocks of the receipt control microcomputer and the receipt data processing, and a power control switch (SW4) for switching on/off the operating electric power supplied to the receipt data processing section (60) according to the control of said receipt control microcomputer. A remote alarm receipt device according to claim 5, wherein the receipt data processing section (60) comprises: a demodulator (61) for demodulating to a video signal the signal received from an amplifier (44) in the data receipt section (40), an analog/digital converter (62) for digitizing the output of the demodulator, a memory controller (63) for controlling to store or display on the screen (66) the output of the analog/digital converter as many as the predetermined number of times of storage for received video data according to the control of said receipt control microcomputer, a memory (64) for storing the video data received according to the control of the memory controller (63), a digital/analog converter (65) for converting to an analog signal the video data generated through the said memory controller, and a monitor (66) for displaying the output of the digital/analog converter in pictures.

Inventors: CHOI HYUN JONG, CHOI, HYUN JONG
Applicants: GOLD STAR CO, GOLDSTAR CO. LTD.
Application year: 1990
Main classification: H04M11
IPC codes: H04Q9, G08B23, G08B25, G08B15, G08B13, H04N7, H04M11