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41. 发明专利

JPH05316485A TELEVISION RECEIVER 失效
公开(公告)号：JPH05316485A
公开(公告)日：1993-11-26
申请号：JP11580492
申请日：1992-05-08
申请人： HITACHI LTD
发明人： KAGEYAMA MASAHIRO , FUKINUKI NORIHIKO , YOSHIKI HIROSHI
IPC分类号： H04N5/44 , H04N7/01 , H04N7/015 , H04N7/00
摘要： PURPOSE:To obtain a TV signal having high quality by improving picture quality by means of an auxiliary signal and considerably removing noise in the low frequency part of the auxiliary signal with the use of a filter removing the low component of a [vertical-time] frequency in the auxiliary signal. CONSTITUTION:A separation circuit 1 separates a transmission signal T in a jump scan form transmitted from a transmission side, into a main signal VM an the auxiliary signal VT, and they are demodulated in demodulation circuits 2 and 3. Then, they are converted into sequential scan forms in sequential scan conversion circuits 4 and 5. An auxiliary signal f-v frequency inhibition filter 6 removes noise and an adder 7 adds it to the main signal so as to display it in a monitor 8. In such a case, the filter for removing the low frequency component of the [vertical-time] frequency of the auxiliary signal, namely, the f-v low frequency inhibition filter, is used. Thus, picture quality by the auxiliary signal is improved while the noise of the low frequency component in the auxiliary signal can considerably is removed.

42. 发明专利

JPH04253489A TRANSMISSION/RECEPTION SYSTEM FOR TELEVISION SIGNAL AND TRANSMISSION/RECEPTION DEVICE 失效
公开(公告)号：JPH04253489A
公开(公告)日：1992-09-09
申请号：JP961891
申请日：1991-01-30
申请人： HITACHI LTD
发明人： KAGEYAMA MASAHIRO , YOSHIKI HIROSHI , HIRANO YASUHIRO , SUZUKI NORIHIRO
IPC分类号： H04N5/253 , H04N7/015 , H04N7/08 , H04N7/081 , H04N9/11 , H04N11/00 , H04N11/24
摘要： PURPOSE:To eliminate need for signal processing for movement adaptive type and to completely separate superimposing information by forming a component of a signal subject to frequency multiplex to be a form of a scanning line group in matching with a film frame. CONSTITUTION:A signal component subject to frequency multiplex and a luminance signal component at a frequency band form a signal with a scanning line group able to be separated by a fixed arithmetic operation such as inter- field sum and difference or the like at a receiver side. When a film frame is converted into a TV field, a scanning line L is grouped for each of 5 scanning lines by 5 fields in matching with the film frame. Y and C signals are used for two signals per one group of the same number as the film frame number and an H signal is one signal per group and the same signal is repetitively multiplexed in the group. In this case, the Y signal is multiplexed as it is and the C signal is multiplexed while being modulated by a subcarrier increasing with time and the H signal is multiplexed while being modulated by a subcarrier decreasing with time.

43. 发明专利

JPH04137892A SIGNAL DETECTION CIRCUIT 失效
公开(公告)号：JPH04137892A
公开(公告)日：1992-05-12
申请号：JP25690690
申请日：1990-09-28
申请人： HITACHI LTD
发明人： KAGEYAMA MASAHIRO , YOSHIKI HIROSHI
IPC分类号： H04N17/00 , H04N5/253 , H04N7/01 , H04N9/78
摘要： PURPOSE:To suppress the deterioration in a reproduced picture when a still picture is consecutive for a long time by providing a means detecting a 5-field period of the result of movement detection, a means storing a period detection result, and a means generating a signal of the same period according to the result of period detection to the title detection circuit. CONSTITUTION:After the detection of inter-frame movement, a 5 field period detection circuit 7 detects a 5 field period being the result of movement detection and when only one 'still field' without difference between frames is in existence in 5 field periods, the picture is used as a tele-cine picture, when no 'still field' is in existence, the picture is used as a general picture and the mode is stored in a storage circuit 8. When plural 'still fields' are in existence, the mode before reaching the still picture state is read from the storage circuit 8. Furthermore, when the tele-cine picture is confirmed, a self-running circuit 9 is triggered to generate a signal of 5 field periods and it is used for a reference phase in the case of a still picture causing unstable field phase. Thus, the deterioration in the reproduced picture is less when the still picture is consecutive for a long time.

44. 发明专利

JPH0472966A SIGNAL DETECTION CIRCUIT 失效
公开(公告)号：JPH0472966A
公开(公告)日：1992-03-06
申请号：JP18394090
申请日：1990-07-13
申请人： HITACHI LTD
发明人： KAGEYAMA MASAHIRO , ISHIKURA KAZUO , YOSHIKI HIROSHI
IPC分类号： H04N5/253 , H04N7/01 , H04N9/11 , H04N9/78
摘要： PURPOSE:To detect a 'telecine picture' and to detect a field phase used for control or the like with high accuracy by dividing a picture into plural blocks, processing the result and providing a hysteresis characteristic to a 'telecine picture' detection circuit. CONSTITUTION:A sent television signal is inputted to an inter-frame movement detection circuit 2 and a block control circuit 8 uses a hold circuit 9 reset for each block to hold the signal for one field period. Then a 5-field period detection circuit 10 is used to detect the periodicity for each block and a field phase for the period. When a signal converted from the film is inputted, an L level (still field) is outputted for 5-field period without fail. In the case of the signal converted from the film, an H level as a 'telecine picture' is outputted and in other case, an L level as a 'general picture' is outputted for each block.

45. 发明专利

JPH0279690A TELEVISION SIGNAL FORMING METHOD 失效
公开(公告)号：JPH0279690A
公开(公告)日：1990-03-20
申请号：JP22997188
申请日：1988-09-16
申请人： HITACHI LTD
发明人： FUKINUKI NORIHIKO , HIRANO YASUHIRO , YOSHIKI HIROSHI , ISHIKURA KAZUO , NAGAHARA SHUSAKU
IPC分类号： H04N7/015 , H04N7/00
摘要： PURPOSE:To form a television signal with a wide aspect ratio having compatibility by applying a simple processing by performing a signal processing such as time base extension and compression, etc., only for a side panel part. CONSTITUTION:Three original color signals R, G, and B with the wide aspect ratio obtained by an image pickup device 1 are converted to the signals R', G', and B' on which the time base compression is applied so that the side panel part can be housed in an overscan area by a time base conversion part 2. And at a YIQ conversion circuit 3, the signals are converted, for example, to a luminance signal Y, and color difference signals I and Q, and the signal processing of encoding with the same system as the current NTSC system is applied on those signals at an NTSC encoder circuit 4, then, the television signal with the wide aspect ratio having the compatibility is formed. In such a way, it is possible to form the television signal with the wide aspect ratio generating a few amount of deterioration in picture quality at the boundary part of a center panel and a side panel.

46. 发明专利

JPH01243687A HIGH DEFINITION TELEVISION SIGNAL RECEPTION CIRCUIT 失效
公开(公告)号：JPH01243687A
公开(公告)日：1989-09-28
申请号：JP6936588
申请日：1988-03-25
申请人： HITACHI LTD
发明人： SUZUKI NORIHIRO , ISHIKURA KAZUO , YOSHIKI HIROSHI
IPC分类号： H04N11/00 , H04N7/015 , H04N11/02 , H04N11/24
摘要： PURPOSE:To prevent leakage from a C signal to a YH' signal at the time of a still picture by cancelling the regeneration of the YH' signal in a color vertical edge part. CONSTITUTION:The output of the YH' signal and the output of a CF signal to be obtained through a frame comb-line filter 1 and a field comb-line filter 3 are passed through an absolute value device 10 and a comparator 11 in the processing part of the still picture and '1' is outputted when the CF signal is greater. A composite signal is passed to an LPF 12 and an edge is detected with the use of a vertical edge detector 13. The vertical edge is detected from the luminance signal of a low frequency area and the extraction of the YH' signal is prevented in the edge part. Thus, the leakage from the C signal to the YH' signal can be removed and a picture quality deterioration by a crosstalk can be prevented.

47. 发明专利

JPS63224492A REGENERATING CIRCUIT FOR SUBCARRIER SIGNAL 失效
公开(公告)号：JPS63224492A
公开(公告)日：1988-09-19
申请号：JP5652387
申请日：1987-03-13
申请人： HITACHI LTD
发明人： HIRANO YASUHIRO , YOSHIKI HIROSHI
IPC分类号： H04N9/45 , H04N9/44
摘要： PURPOSE:To reduce the influence of transmission distortion, etc., and to prevent malfunction by regenerating the reference phase of a subcarrier according to the phase relation of a chrominance subcarrier when the subcarrier has a maximal or minimal value. CONSTITUTION:When digital signal processing is performed at the time of sampling a received signal at 4fsc four times as high as the chrominance subcarrier, a received television signal is converted by an A/D converting circuit 1 into a digital signal of 4fsc. A timing extracting circuit 8, on the other hand, extracts fsc and 4fsc, and horizontal and vertical synchronizing signals HD and VD necessary for signal processing. A line control circuit 4 specifies scanning lines of the HD and VD signal where the subcarrier mu0 is inserted and a mu0 regenerating circuit 5 generates a subcarrier mu0 in said period according to the phase relation between the maximal point of the subcarrier mu0 and fsc. A decoder circuit 3 uses those signals to generate a luminance signal Y and color difference signals I and Q by demodulation.

48. 发明专利

JPS63224490A BAND INVERTING MULTIPLEX SYSTEM FOR HIGH-DEFINITION INFORMATION 失效
公开(公告)号：JPS63224490A
公开(公告)日：1988-09-19
申请号：JP5652287
申请日：1987-03-13
申请人： HITACHI LTD
发明人： SUZUKI NORIHIRO , FUKINUKI NORIHIKO , HIRANO YASUHIRO , YOSHIKI HIROSHI
IPC分类号： H04N7/015 , H04N7/00
摘要： PURPOSE:To realize the band inverting multiplexing of high-definition information by performing a frequency shift once and at a low carrier frequency by shifting the frequency of a return part generated at a sampling frequency and multiplexing it in a current band, and using a filter which passes only the part. CONSTITUTION:A transmission side separates a luminance signal Y into a luminance signal YL of

49. 发明专利

JPS6372288A SYSTEM AND DEVICE FOR COLOR TELEVISION 失效
公开(公告)号：JPS6372288A
公开(公告)日：1988-04-01
申请号：JP21571986
申请日：1986-09-16
申请人： HITACHI LTD
发明人： MATSUI KAZUMASA , FUKINUKI NORIHIKO , YOSHIKI HIROSHI
IPC分类号： H04N11/14
摘要： PURPOSE:To obtain a picture with improved color resolution by adopting the same frequency and modulation system of a chrominance subcarrier wave as those of the existing system and widening the band of a chrominance carrier signal more than the band of the existing system to widen the demodulation band of a color difference signal. CONSTITUTION:A luminance signal is given to an input terminal 1, color difference signals I,Q are given to input terminals 2, 3 and a luminance signal Y is fed to a final adder circuit 10 via a delay circuit 9. Further, the color difference signals I, Q are fed to balancing modulators 13, 18 via LPFs 11, 14 and delay lines 12, 15 and fed to a color signal adder circuit 21. A system selection signal U/N is added to an input terminal 8 and in case of the system improving color resolution, the output of a delay circuit 15 is fed to the modulator 18 from a changeover switch 17, and in case of the existing NTSC system, the output of the LPF 16 is fed to the balancing modulator 18. Moreover, in this system, the output of the delay circuit 23 is given to the final adder circuit 10 by the system selection signal U/N and the output of the LPF 22 in case of the NTSC system is fed to the circuit 10.

50. 发明专利

JPS6370678A CONSTITUTING METHOD FOR TELEVISION SIGNAL 失效
公开(公告)号：JPS6370678A
公开(公告)日：1988-03-30
申请号：JP21388686
申请日：1986-09-12
申请人： HITACHI LTD
发明人： HIRANO YASUHIRO , YOSHIKI HIROSHI , SHIGESA HIDEHIKO , FUKINUKI NORIHIKO
IPC分类号： H04N7/015 , H04N7/00
摘要： PURPOSE:To transmit high-definition image information even on a moving image which moves slowly by converting the time frequency component of high-definition information into a low frequency component and selecting and multiplexing converted information adaptively. CONSTITUTION:A time frequency shifting circuit 1 generates a signal YH' by shifting the high frequency component YH of the high-definition information, e.g., a luminance signal in frequency with a subcarrier fS. Further, a motion detecting circuit 6 detects the motion of a time frequency area in three stages and a selecting circuit 7 selects a signal YH at 0 - 7.5 Hz, YH' at 7.5 - 15 Hz, and a zero signal at >=15 Hz according to the result of the motion detection. Then a horizontal frequency shifting circuit 8 makes a frequency shift so that a signal spectrum is within the current TV signal band. An adder 2 adds this frequency-shifted signal YH'' to an NTSC signal to generate a compatible TV signal. In such a case, mode information indicating which of the signals YH and YH' is added is also generated.

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