CN1165412A - Antenna pressurization mixing return circuit - Google Patents
Antenna pressurization mixing return circuit Download PDFInfo
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- CN1165412A CN1165412A CN97104262A CN97104262A CN1165412A CN 1165412 A CN1165412 A CN 1165412A CN 97104262 A CN97104262 A CN 97104262A CN 97104262 A CN97104262 A CN 97104262A CN 1165412 A CN1165412 A CN 1165412A
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- mentioned
- antenna
- booster amplifier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
- H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
Abstract
An antenna booster-mixer circuit is incorporated into a VTR (Video Tape Recorder) and comprises an antenna input terminal, an antenna output terminal, a boosted amplifier and a signal by-pass circuit. When the power supply for the VTR is turned on for signal recording or reproduction, a received signal supplied to the antenna input terminal is transmitted via the amplifier to the output terminal. When the power supply for the VTR is turned off, the received signal at the input terminal is outputted from the terminal through the by-pass circuit.
Description
The present invention is the relevant antenna pressurization mixing return circuit that uses in video tape recorder, particularly when power supply disconnection at video tape recorder, and the antenna pressurization mixing return circuit that antenna receiving signal also can transmit at the antenna input/output terminal.
The television broadcasting mode in current Europe, be that the transmit of each channel is broadcast by hyperfrequency (UHF), therefore when joining when receiving such transmit with video tape recorder, normally on the antenna input of video tape recorder, be connected to television antenna, the input of antenna output end and TV imagescope is joined and receive transmit.
In this case, the antenna pressurization mixing device is housed in the machine in video tape recorder, and the antenna pressurization mixing device is formed by amplifying booster amplifier, antenna input and the antenna output end etc. of received signal on the antenna.
Antenna pressurization mixing return circuit is by being connected on the antenna received television signal of antenna input, when received TV signal is carried out video picture by TV developing device, the power connection of video tape recorder, booster amplifier is in running order, and received signal is supplied with the TV imagescope through antenna output end again by after the booster amplifier amplification.Promptly on the one hand by TV signal that antenna received, when received TV signal is recorded a video on video tape recorder, the power connection of video tape recorder, booster amplifier is in running order, after received TV signal is amplified by booster amplifier, then supply with the tuner of video tape recorder along separate routes, the required image signal is separated to be in harmonious proportion separate, thereby the picture signal that obtains is recorded a video.And the picture signal that will be recorded on video tape recorder is on the other hand regenerated, when this regenerated signal receives video picture on the TV imagescope, regenerated signal adds the mixing link by high-frequency modulator, and after forming the signal identical, again this signal is supplied with the TV imagescope with TV signal.
Shown in Figure 7 is receiving system known when receiving transmit by eurovision broadcasting mode, promptly express the main composition diagram that is connected between video tape recorder and the TV imagescope, Fig. 8 is the composition diagram that is illustrated in the internal structure of video tape recorder shown in Fig. 7, wherein 8A is the square frame composition diagram of configuration annexation between antenna pressurization mixing return circuit and video tape recorder and the TV imagescope, and 8B is the loop diagram of the inner concrete structure of antenna pressurization mixing return circuit.
Like that, video tape recorder (VTR) the 41st is made up of antenna input 53, antenna output end 54, antenna pressurization mixing return circuit 42 and recording/reproduction loop 43 shown in Fig. 7 and Fig. 8 A, 8B.Antenna 44 joins with antenna input 53, and the antenna input 55 and the antenna output end 54 of TV imagescope 45 join.Antenna pressurization mixing return circuit 42 is by the 1st coupling capacitance the 56, the 1st booster amplifier the 46, the 1st inductance the 57, the 1st distributor the 47, the 2nd booster amplifier the 48, the 2nd inductance the 58, the 2nd distributor the 49, the 2nd coupling capacitance 59 and high frequency (RF) modulator 50 and form.Recording/reproduction loop 43 is made up of respectively recording/reproduction portion 51 and tuner.
In antenna pressurization mixing return circuit 42 sides, the 1st booster amplifier 46, its input is to join with antenna input 53 by the 1st coupling capacitance 56, its output is to join with the 1st distributor 47,47 1 outputs of the 1st distributor are to join with the input of the 2nd booster amplifier 48, and another output is to join with the input of the tuner 52 of recording/reproduction loop side.The input of the 2nd distributor 49 and the output of the 2nd booster amplifier 48 are joined, and another input is to join with the output of high-frequency modulator 50, its output is to join with antenna output end by the 2nd coupling capacitance 59, and the output of the recording/reproduction portion 51 of the input of high-frequency modulator 50 and recording/reproduction loop 43 sides is joined.The power supply 46 of the 1st booster amplifier 46 is to join with power end 60 by the 1st inductance 57, and the power supply of the 2nd booster amplifier 48 is to join with power end 60 by the 2nd inductance 58.In recording/reproduction loop 41 sides, the output of the input of recording/reproduction portion 51 and tuner 52 is joined.
By the above-mentioned antenna pressurization mixing return circuit of forming 42, be performed as follows action.
At first connect the power supply of antenna pressurization mixing device 41, to the 1st and the 2nd booster amplifier 46,48 supply line voltages that are connected with power end 60.Wherein when carrying out video picture by 45 pairs of received television signals of TV imagescope, at antenna pressurization mixing return circuit 42, the received signal that antenna 44 is received, supply with the 1st booster amplifier 46 from antenna input 53 by the 1st coupling capacitance 56, in succession, after received signal is amplified by the 1st booster amplifier 46, supply with the 1st distributor 47 and carry out two sides distribution.The received signal that is assigned with a side is supplied with the 2nd booster amplifier 48, supplies with coupling capacitance 59 by the 2nd distributor 49 after amplifying, and in succession, supplies with the antenna input 55 of TV imagescope 45, carries out video picture at TV imagescope 45 at last.At this moment, carry out simultaneously with the video picture of received signal in the TV imagescope 45, when video tape recorder 41 is recorded a video to received signal, perhaps with TV imagescope 45 in received signal irrelevant, and when recording a video to received signal by video tape recorder 41, in recording/reproduction loop 43, receive the opposing party's who is assigned with by the 1st distributor 47 received signal as tuner 52, then this received signal is by high frequency conversion and demodulation, be transformed to after the picture signal that is suitable for recording a video, supply with recording/reproduction portion 51, in recording/reproduction portion 51, realize this picture signal is recorded a video.Then, 51 pairs of picture signals that videoed are regenerated in recording/reproduction portion, when the picture signal that is reproduced is carried out video picture on TV imagescope 45, in recording/reproduction loop 43, as regenerating by 51 pairs of picture signals of recording/reproduction portion, then in antenna pressurization mixing return circuit 42, its high-frequency modulator 50 is modulated and frequency translation this regenerated signal, be transformed into the received signal that is suitable for TV signal, and the received signal that is transformed, supply with the 2nd coupling capacitance 59 by the 2nd distributor 49, follow and supply with the antenna connection terminal 55 of TV imagescope 45, carry out video picture at TV imagescope 45 at last.
Like this, by the above-mentioned known antenna pressurization mixing return circuit 42 of forming, TV receiving signal is supplied with TV imagescope 45, carry out video picture by the TV imagescope, supplying with the video tape recorder 41 of TV receiving signal records a video, the regenerated signal of video tape recorder 41 is supplied with TV imagescope 45, can be implemented in three functions that TV imagescope 45 carries out video picture.
Above-mentioned known antenna pressurization mixing return circuit 42, its the 1st and the 2nd booster amplifier 46,48, with video tape recorder 41 are same altogether power supplys, promptly when the power supply access failure of video tape recorder 41, the power supply of the 1st and the 2nd booster amplifier 46,48 is not switched on yet, and therefore the problem of using TV imagescope 45 but can not show the received signal image is arranged.
Its reason is in video tape recorder 41, the distributor that distributes received signal all is housed usually, and very big decay is arranged to received signal through this distributor, the electric field strength that connects former UHF section transmit simultaneously is also not too big, therefore need in antenna pressurization mixing return circuit 42, nationality helps the decay that the 1st and the 2nd booster amplifier 46,48 compensates received signal, makes it improve the quality of display image.
On the one hand, above-mentioned known antenna pressurization mixing return circuit 42, as top said, although just make under the situation that TV imagescope 45 moves, the power supply of video tape recorder 41 also need be connected, so video tape recorder 41 is to consume unnecessary power, this also is the problem of never wishing from saving the viewpoint of the energy.
The present invention is the solution relevant issues, the antenna pressurization mixing return circuit that is proposed, and its purpose is exactly, when not using video tape recorder, though disconnect the power supply of video tape recorder, and received signal can transmit under little decay also, this just can not produce unnecessary power consumption certainly.
For achieving the above object, the means that the present invention possessed are to be equipped with in video tape recorder: antenna input and antenna output end; Booster amplifier with above-mentioned video tape recorder common source joins between above-mentioned antenna input and the above-mentioned output; And the signal bypass loop that is in parallel with above-mentioned booster amplifier.When the power connection of above-mentioned video tape recorder, supply with the antenna receiving signal of above-mentioned antenna input, then be sent to above-mentioned antenna output end from above-mentioned booster amplifier, when the power supply of above-mentioned video tape recorder disconnects, supply with the above-mentioned antenna receiving signal of antenna input, by the signal bypass loop, then export from above-mentioned antenna output end.
By above-mentioned means, in antenna pressurization mixing return circuit, the on/off of corresponding video tape recorder power supply is housed, and the power supply booster amplifier of on/off thereupon, and the signal bypass loop that is in parallel with this booster amplifier.When on video tape recorder, carrying out signal video recording and regeneration, connect as the power supply one of video tape recorder, then the signal drive access of antenna pressurization mixing return circuit is converted in the booster amplifier side.At this moment, supply with the received signal of antenna input, after amplifying by booster amplifier, carry out the processing of desired signal to received signal, be transformed to picture signal, this picture signal is supplied with the recording/reproduction loop of video tape recorder, picture signal is recorded a video, perhaps, will be after the picture signal that the recording/reproduction loop is recorded be regenerated, the signal processing required by picture signal is transformed to received signal again, and this received signal is supplied with the TV imagescope from antenna output end, carries out video picture regeneration on the TV imagescope.But, when only carrying out the signal reception, connect as the power supply one of video tape recorder, then the signal drive access of antenna pressurization mixing return circuit promptly is converted in signal bypass side.At this moment, supply with the received signal of antenna input, be sent to direct antenna output end, then and from antenna output end supply with the TV imagescope, on the TV imagescope, carry out video picture regeneration by the signal bypass loop.
Like this, by above-mentioned means, when video recording that on video tape recorder, does not carry out signal and regeneration, when promptly just carrying out the reception of signal, the power supply of antenna pressurization mixing return circuit is access failure also, TV receiving signal is not had transmission loss yet, can supply with the TV imagescope, therefore can obtain not produce the antenna pressurization mixing return circuit of unnecessary power dissipation by antenna pressurization mixing return circuit.
Below, by accompanying drawing embodiments of the invention are elaborated.
Fig. 1 is the square frame composition diagram of configuration annexation between this antenna pressurization mixing return circuit, video tape recorder and the TV imagescope;
Fig. 2 is the loop composition diagram of antenna pressurization mixing return circuit the 1st embodiment of the present invention;
Fig. 3 is the loop composition diagram of the 2nd embodiment of antenna pressurization mixing return circuit of the present invention;
Fig. 4 is the loop composition diagram of the 3rd embodiment of antenna pressurization mixing return circuit of the present invention;
Fig. 5 is illustrated among the 1st embodiment and the 2nd embodiment illustrated in figures 1 and 2, during reception, when when video recording and regeneration, and the key diagram of each part state list of living in;
Fig. 6 is the grid and the performance plot of source voltage with corresponding drain voltage/current characteristics of the 1st change over switch and the employed N type of the 2nd change over switch slot field-effect transistor (FET);
Fig. 7 is in the television broadcasting receiving system of European terms, the composition diagram of the annexation of video tape recorder and TV imagescope and antenna;
Fig. 8 is in TV imagescope shown in Figure 5, is the loop composition diagram of example with the antenna pressurization mixing return circuit.
Shown in Figure 1 is antenna pressurization mixing return circuit of the present invention and video tape recorder, and the square frame composition diagram of the relation that is connected between the TV imagescope, and shown in Figure 2 is the loop composition diagram of the 1st embodiment of antenna pressurization mixing return circuit of the present invention.
As illustrated in figures 1 and 2, video tape recorder (VTR) 1 is provided with antenna pressurization mixing return circuit 2, recording/reproduction loop 3, and antenna input 14 and antenna output end 15.Antenna 4 joins with antenna input 14, and the antenna input 18 and the antenna output end 15 of TV imagescope 5 join.Antenna pressurization mixing return circuit 2 is made up of the 1st coupling capacitance the 19, the 1st change over switch the 6, the 1st buffer resistance the 21, the 2nd coupling capacitance the 20, the 1st booster amplifier the 7, the 1st inductance the 22, the 1st distributor the 8, the 2nd booster amplifier the 9, the 2nd inductance the 23, the 2nd distributor the 10, the 3rd coupling capacitance the 24, the 2nd buffer resistance the 25, the 2nd change over switch the 11, the 4th coupling capacitance 26, signal bypass loop 12 and high frequency (RF) modulator 13.Recording/reproduction loop 3 is made up of recording/reproduction portion 16 and tuner 17.And the 1st change over switch 6 by the 1st switch with N type channel fet the 6 (1), the 1st switch with diode 6 (2) and the 1st resistance 6 (3) and form, the 2nd change over switch 11 by the 2nd switch with N type channel fet the 11 (1), the 2nd switch with diode 11 (2) and the 3rd resistance 11 (3) and form.The 1st distributor 8 is made up of the 1st dispenser 8 (1), and the 2nd distributor 10 is made up of the 2nd dispenser 10 (1).Signal bypass loop 12 is made up of the 1st high resistance the 12 (1), the 2nd high resistance the 12 (2), the 5th coupling capacitance the 12 (3), the 6th coupling capacitance the 12 (4), the 5th resistance 12 (5) and bypass diode 12 (6).
In antenna pressurization mixing return circuit 2 sides, the 1st change over switch 6, its input is to join with antenna input 14 by the 1st coupling capacitance 19, the 1st output is to join by the input of the 2nd coupling capacitance 20 and the 1st booster amplifier 7, join with power end 27 by the 1st buffer resistance 21, and the 2nd output is to join with the input of signal bypass loop 12.The 1st booster amplifier 7, its output is joined with the input of the 1st distributor 8, and power supply joins with power end 27 by the 1st inductance 22.The input of 8, one outputs of the 1st distributor and the 2nd booster amplifier 9 is joined, and another output is joined with the input of the tuner 17 of recording/reproduction loop 3 sides.The 2nd booster amplifier 9, its output is joined with an input of the 2nd distributor 8, and power supply joins with power end 27 by the 2nd inductance 23.The 2nd distributor 10, its another input is joined with the output of high-frequency modulator 13, and output is joined by the input of the 3rd coupling capacitance 24 and the 2nd change over switch 11.The 2nd change over switch 11, its 1st input is joined with power supply by the 2nd buffer resistance 25, and the 2nd input is joined with the output of signal bypass loop 12, and output is joined with antenna output end 15 by the 4th coupling capacitance 26.High-frequency modulator 13, its input are to join with the output of the recording/reproduction portion 16 of recording/reproduction loop 3 sides.
In the 1st change over switch 6, the 1st switch FET6 (1), its source electrode is to join with the negative electrode of diode 6 (2) and an end of the 1st resistance 6 (3) with the 1st coupling capacitance the 19, the 1st switch, grid is that the other end and the earth point with the 1st resistance 6 (3) joins, and drain D is to join with the input of signal bypass loop 12.The 1st switch diode 6 (2), its anode is to join with the 2nd coupling capacitance 20.In the 2nd change over switch 11, the 2nd switch FET11 (1), its source electrode is to join with the negative electrode of diode 11 (2) and an end of the 3rd resistance 11 (3) with the 4th coupling capacitance the 26, the 2nd switch, grid is that the other end and the earth point with the 3rd resistance 11 (3) joins, and drain electrode is to join with the output of signal bypass loop 12.The 2nd switch diode 11 (2), its anode is to join with the 3rd coupling capacitance 24.In signal bypass loop 12, the 1st high resistance 12 (1), an end are by the input of bypass loop 12 and the 5th coupling capacitance 12 (3), join with the anode of bypass with diode 12 (6), and the other end and earth point join.Bypass diode 12 (6), its anode are to join with power end 27, join by the end of the 6th coupling capacitance 12 (4) with the 2nd high resistance 12 (2) by the 5th resistance 12 (5), and negative electrode is to join with earth point.The 2nd high resistance 12 (2), an end are to join with the output of signal bypass loop 12, and the other end is to join with earth point.At this moment, the 1st change over switch 6 employed the 1st switches N type channel fet 6 (1) and the 2nd change over switch 11 employed the 2nd switches N type channel fet 11 (1), the characteristic that has as shown in Figure 6 is such, and wherein any curve is as drain voltage (V
D) at little interval, when increasing drain voltage (V gradually
D) time, drain current (I then
D) also have the characteristic of proportional increase thereupon, but as drain voltage (V
D) when increasing to than above-mentioned bigger limit, the voltage (V between then corresponding grid and the source electrode
GS) value, its drain current (I
D) value will keep certain, so the voltage (V between grid and source electrode
GS) when value is zero, its drain current (I
D) certain value be maximum, along with voltage (V between grid and source electrode
GS) value becomes negative value, and drain current (I
D) certain value then have with the characteristic that reduces of order.
In recording/reproduction loop 3 sides, the output of the input of recording/reproduction portion 16 and tuner 17 is joined.
In above-mentioned composition, the antenna pressurization mixing return circuit 2 of present embodiment is performed as follows action.
At first cut-off under the state of power supply at video tape recorder, the received signal that will be received at antenna 4, by antenna pressurization mixing return circuit 2, when being transferred on the TV imagescope 5 (when receiving), the the 1st and the 2nd change over switch 6 and 11, because of to power end 27 supply line voltage not, therefore the 1st and the 2nd switch is cut-off with diode 6 (2) and 11 (2).When the 1st and the 2nd switch is cut-off with diode 6 (2) and 11 (2), the 1st and the 2nd switch grid and the voltage between source electrodes (V of FET6 (1) and 11 (1)
GS), be respectively 0 bypass.At this moment, the 1st and the 2nd switch is with diode 6 (2) and 11 (2), for example as characteristic shown in Figure 6, as grid and voltage between source electrodes (V
GS) when being 0 bypass, its drain current (I
D) value is for maximum, promptly the 1st and the 2nd switch FET6 (1) and 11 (1) is in on-state, and the 1st and the 2nd change over switch 6 and 11 is converted in signal bypass loop 12 sides.The received signal that on TV signal reception antenna 4, is received wherein, when on the antenna input 14 of supplying with antenna pressurization mixing return circuit 2, the the 1st and the 2nd change over switch 6 and 11 then, be converted in signal bypass loop 12 sides, therefore, received signal is through the 1st change over switch 6, signal bypass loop 12 and the 2nd change over switch 11, supply with antenna output end 15, in succession, supply with the antenna input 18 of TV imagescope 5, on TV imagescope 5, carry out received signal and video picture regeneration.At this moment, in signal bypass loop 12, to power end 27 supply line voltage not, bypass diode 12 (6) is to be in the state of cut-offfing, therefore the received signal that is supplied at the input of signal bypass loop 12, actual is under little loss of signal state, by the 5th coupling capacitance 12 (3) and the 6th coupling capacitance 12 (4), is transferred to the output of signal bypass loop 12.
In video tape recorder 1, use recording/reproduction loop 3, when with received signal that antenna received in the recording/reproduction loop 3 when recording a video (when calling video recording in the following text) as picture signal, perhaps will regenerate in the picture signal that recording/reproduction loop 3 is recorded, and when supplying with TV imagescope 5 (when calling regeneration in the following text) as the video picture signal, then connect the power supply of video tape recorder 1, to the power end supply line voltage of antenna pressurization mixing return circuit 2.At this moment, the 1st and the 2nd change over switch 6 and 11, because to power end 27 supply line voltage, so the 1st and the 2nd switch diode 6 (2) and 11 (2), voltage (V between its anode and negative electrode
AK), a quite additional forward bias voltage drop (positive voltage).Thereby the 1st and the 2nd switch is in on-state with diode 6 (2) and 11 (2), the 1st and the 2nd switch FET (1) and 11 (1), and for example as characteristic shown in Figure 6, grid and voltage between source electrodes (V
GS) negative bias values of value is big more, drain current (I then
D) value more very little.And grid and voltage between source electrodes (V
GS), it is to select and change along with the resistance value of the 1st buffer resistance 21 and the 1st resistance 6 (3), so grid and voltage between source electrodes (V
GS), make its direction that increases to negative direction select the resistance value of the 1st buffer resistance 21 and the 1st resistance 6 (3) as far as possible.As the resistance value selecting, then the 1st and the 2nd switch FET6 (1) and 11 (1) is in the state of cut-offfing, and the 1st and the 2nd change over switch 6 and 11 is converted at the 1st and the 2nd booster amplifier 7 and 9 sides.
When recording a video, the received signal that is received at antenna 4, as long as supply with the antenna input 14 of antenna pressurization mixing return circuit 2, the the 1st and the 2nd change over switch 6 and 11 then, promptly be converted at the 1st and the 2nd booster amplifier 7 and 9 sides, therefore received signal is supplied with the 1st booster amplifier 7 and the 1st distributor 8 from the 1st change over switch 6, and the 1st distributor divides 2 assign direction.One side's received signal of being distributed at the 1st distributor 8, via the 2nd booster amplifier the 9, the 2nd distributor 10 and the 2nd change over switch 11, supply with antenna output end 15, supply with the antenna input 18 of TV imagescope 5 in succession, and carry out the video picture regeneration of received signal at TV imagescope 5.Meanwhile, another received signal that is assigned with at the 1st distributor 8, supply with the tuner 17 of recording/reproduction loop 3 sides, and received signal is conciliate after modulation is changed to the picture signal that is suitable for recording a video by frequency translation, resupply recording/reproduction portion 16, this picture signal is recorded a video in recording/reproduction portion 16.
In addition when regenerating, in recording/reproduction loop 3, when picture signal is regenerated in recording/reproduction portion 16, this picture signal is in the high-frequency modulator 13 of antenna pressurization mixing return circuit 2, by modulation and frequency translation, be transformed to the received signal that is suitable for TV signal, and the received signal of institute's conversion, by from the 2nd distributor 10 to the 2nd change over switches 11, directly supply with antenna output end 15, supply with the antenna input 18 of TV imagescope 5 in succession simultaneously, on TV imagescope 5, carry out the video picture regeneration of received signal.
Like this, as the antenna pressurization mixing return circuit 2 according to the 1st embodiment, the power supply of video tape recorder 1 is to be in the state of cut-offfing, and does not also power to antenna pressurization mixing return circuit 2, do not have big transmission loss to received signal, yet can supply with TV imagescope 5 by signal bypass loop 12.
In addition,, compare, can improve the distortion of phase inter-modulation with the antenna pressurization mixing return circuit before shown in Fig. 8 B as antenna pressurization mixing return circuit 2 according to the 1st embodiment.
Shown in Figure 3 is the loop composition diagram that belongs to the 2nd embodiment of antenna pressurization mixing return circuit 2 of the present invention, for the 1st embodiment, has part to change in the composition of the 1st and the 2nd change over switch loop 6 and 11.
In Fig. 3, about element illustrated in fig. 2 and identical element, be marked with identical symbol, therefore explanation is omitted.
As shown in Figure 3 as seen, in the 1st change over switch loop 6, it is to replace the 1st switch by the ground connection of the 2nd resistance 6 (4) to use the grid of FET6 (1) directly to link to each other with ground, and in the 2nd change over switch loop 11, the 2nd switch is identical with FET6 (1) with the 1st switch with FET11 (1), also is to replace grid by the ground connection of the 4th resistance 11 (4) directly to link to each other with ground.
By the action of above-mentioned the 2nd embodiment that forms, as seen no matter be when receiving, during video recording and during regeneration, with the action of the 1st embodiment that had narrated much at one, therefore, be omitted about the detailed description of the 2nd embodiment.
At this moment, as antenna pressurization mixing return circuit 2 according to the 2nd embodiment, not only can obtain the action effect same with the 1st embodiment, and to improving the distortion aspect of phase inter-modulation, compare with the antenna pressurization mixing return circuit before shown in Fig. 8 B, still can improve about 11 to 22db, compare with the 1st embodiment significantly and improved.
Shown in Figure 4 is the loop composition diagram of the 3rd embodiment of antenna pressurization mixing return circuit 2 under the present invention, relative the 1st embodiment, in the 1st and the 2nd change over switch loop 6 and 11, and during relevant part loop is formed in signal bypass loop 12, change to some extent respectively.
In Fig. 4, about element illustrated in fig. 2 and identical element, be marked with identical symbol, therefore explanation is omitted.
As shown in Figure 4, the 1st change over switch loop 6, form with diode 6 (6) with diode 6 (5) and the 4th switch by the 3rd switch, its input is to join with antenna input 14 by the 1st coupling capacitance 19, join with earth point by the 9th resistance 28, the 1st output is to join with the input of the 1st booster amplifier 7, and the 2nd output is to join with the input of signal bypass loop 12.And the 2nd change over switch loop 11, form with diode 11 (6) with diode 11 (5) and the 6th switch by the 5th switch, the 1st input is joined with the output of the 2nd distributor 10, the 2nd input is joined with the output of signal bypass loop 12, its output is joined with antenna output end 15 by the 4th coupling capacitance 26, joins with earth point by the 10th resistance 29.Signal bypass loop 12 is by the 7th coupling capacitance the 12 (7), the 6th resistance the 12 (8), the 2nd and the 3rd bypass diode 12 (9) and the 12 (10), the 7th resistance 12 (11), filter capacitor 12 (12) and the 8th resistance 12 (13) and form.In the 1st change over switch loop 6, the 3rd switch is with diode 6 (5), and its anode is to join with the 1st booster amplifier 7, and negative electrode is to join with the 1st coupling capacitance 19 and the 4th switch negative electrode with diode 6 (6).The 4th switch diode 6 (6), the input of its anode and signal bypass loop 12 is joined.In the 2nd change over switch loop 11, the 5th switch diode 11 (5), its anode and the 2nd distributor 10 join, and negative electrode and the 4th coupling capacitance 26 and the 6th switch join with the negative electrode of diode 11 (6).The 6th switch diode 11 (6), the output of its anode and signal bypass loop 12 is joined.In signal bypass loop 12, the 7th coupling capacitance 12 (7), one end and the other end join with the input and output of signal bypass loop 12 respectively, and an end of an end of the 6th resistance 12 (8) and the 7th coupling capacitance 12 (7) joins, and the other end joins with the conversion electric power end 30 of supplying with changing voltage.The the 2nd and the 3rd bypass diode 12 (9) and 12 (10), each end of its anode and the 7th resistance 12 (11) and filter capacitor 12 (12) joins, and the other end of negative electrode and the 7th coupling capacitance 12 (7) joins.The 7th resistance 12 (11) other ends and power end 27 join, and filter capacitor 12 (12) other ends and earth point join.One end and the other end of the 8th resistance 12 (13) join respectively with the input and output of signal bypass loop 12.Conversion electric power end 30 is supplied with anodal changing voltage when receiving, supply with the changing voltage of earthing potential when recording a video and regenerate.
By the action of above-mentioned the 3rd embodiment that forms, no matter be when receiving, during video recording and during regeneration, therefore the action of its essence and the 1st embodiment that had narrated is omitted about the detailed description of the 3rd embodiment much at one.
But, when the power supply of video tape recorder 1 is in when cut-offfing state, the 1st change over switch 6, because by the 6th resistance 12 (8) supply conversion electric power ends are positive polarity changing voltages, make the 3rd switch carry out reverse bypass and become to cut-off state with diode 6 (5), and the 4th switch carries out forward bypass with diode 6 (6) and becomes on-state, and therefore the 1st change over switch 6 is converted in signal bypass side 12.Other the 2nd change over switch 11, because by the 6th resistance 12 (8) and the 8th resistance 12 (13) supply conversion electric power ends 30 are positive polarity changing voltages, the 5th switch is to be in reverse bypass to become to cut-off state with diode 11 (5), the 6th switch is to be in forward that bypass becomes on-state with diode 11 (6), and therefore the 2nd change over switch 11 is also changed in signal bypass 12 sides.Moreover, signal bypass loop 12, voltage by the 5th resistance 12 (8) and the 7th resistance 12 (13) supply power ends 27, because of the 2nd and the 3rd bypass diode 12 (9) and 12 (10), be respectively to carry out reverse bypass to become to cut-off state, therefore the received signal that input is supplied with by the 7th coupling capacitance 12 (7), can be transferred to output by the little loss of signal.
In addition when the power supply of video tape recorder 1 is in on-state, the 1st change over switch 6 is earthing potentials by the voltage of the 6th resistance 12 (8) the conversion electric power ends 30 of supplying with, meanwhile because from the supply voltage of the input institute supply power end 27 of the 1st booster amplifier 7, become on-state and make the 3rd switch be in forward bypass with diode 6 (5), make the 4th switch be in reverse bypass with diode 6 (6) and become to cut-off state, therefore the 1st change over switch 6 is carried out conversion at the 1st and the 2nd booster amplifier 7 and 9 sides.And the 2nd change over switch 11, by the 6th resistance 12 (8) and the 8th resistance 12 (13), the voltage of the conversion electric power end 30 of supplying with is earthing potentials, by from the 2nd booster amplifier 9 with output to the supply voltage of the 2nd distributor 10 supply power ends 27, so the 5th switch is in forward with diode 11 (5), and bypass becomes on-state, the 6th switch is in reverse bypass with diode 11 (6) and becomes to cut-off state, and the result makes the 2nd change over switch 11 also be carried out conversion at the 1st and the 2nd booster amplifier 7 and 9 sides.
So as seen, the situation of the 3rd embodiment is identical with the 1st embodiment, when the power supply of video tape recorder 1 cut-offs, antenna pressurization mixing return circuit 2 is not powered, there is not big transmission loss to received signal yet, therefore can supply with by 12 pairs of TV imagescopes of signal bypass, thereby can obtain not produce the antenna pressurization mixing return circuit 2 of unnecessary power consumption.
Shown in Figure 5 is in the 1st to the 3rd embodiment, when receiving, during video recording and during regeneration, and the key diagram of the list of each part state of living in.Fig. 5 A is the 1st and the 2nd embodiment, and Fig. 5 B is the 3rd embodiment.
At first shown in Fig. 5 A, the the 1st and the 2nd embodiment, when when recording a video and when regeneration, to video tape recorder 1 and antenna pressurization mixing return circuit 2 energized, thereby make the 1st change over switch 6 and the 2nd change over switch 11, simultaneously be carried out conversion at the 1st and the 2nd booster amplifier 7 and 9 sides, when video recording, the part of received signal is supplied with the recording/reproduction loop 3 of video tape recorder 1 and is recorded a video, its rest parts received signal is supplied with TV imagescope 5 and is carried out video picture regeneration, its whole signals of being regenerated in recording/reproduction loop 3 when regeneration are supplied with TV imagescope 5 and are carried out video picture regeneration.But when receiving, video tape recorder 1 and antenna pressurization mixing return circuit 2 are disconnected power supply, thereby make the 1st change over switch 6 and the 2nd change over switch 11, be converted in signal bypass loop 12 sides simultaneously, therefore all received signal is passed through signal bypass loop 12, supply with TV imagescope 5, thereby carry out video picture regeneration.
Shown in Fig. 5 B, the 3rd embodiment, when video recording and regeneration, video tape recorder 1 and antenna pressurization mixing return circuit 2 energized, and conversion electric power end 30 is supplied with the changing voltage of earthing potentials, so the 1st change over switch 6 and the 2nd change over switch 11, be converted at the 1st and the 2nd booster amplifier 7 and 9 sides simultaneously, when video recording, the part of received signal is supplied with the recording/reproduction loop 3 of video tape recorder 1 and is recorded a video, and its rest parts received signal is supplied with TV imagescope 5 and carried out video picture regeneration, when regeneration, whole signals that it is regenerated in recording/reproduction loop 3 are supplied with TV imagescope 5 and are carried out video picture regeneration.In addition when receiving, to video tape recorder 1 and antenna pressurization mixing return circuit 2 energize not, and what conversion electric power end 30 was supplied with is the positive polarity changing voltage, so the 1st change over switch 6 and the 2nd change over switch 11, be converted in signal bypass loop 12 sides simultaneously, and all received signal is supplied with TV imagescope 5 by signal bypass loop 12, thereby carries out video picture regeneration.
Explain by above-mentioned, power supply according to the present invention when video tape recorder is in the state of cut-offfing, to antenna pressurization mixing return circuit supply power not, there is not big transmission loss to received signal yet, therefore pass through the signal bypass loop of antenna pressurization mixing return circuit, can supply with video tape recorder, can obtain not produce the antenna pressurization mixing return circuit effect of unnecessary power consumption at last.
In addition, according to the present invention, compared with former antenna pressurization mixing return circuit, still can be improved The effect of intermodulation distortion.
Claims (10)
1. the feature of this antenna pressurization mixing return circuit is that antenna input is housed in video tape recorder, antenna output end, booster amplifier with above-mentioned video tape recorder common source is connected between above-mentioned antenna input and the above-mentioned antenna output end, and the signal bypass loop that is in parallel with above-mentioned booster amplifier, when the power connection of above-mentioned video tape recorder, supply with the antenna receiving signal of above-mentioned antenna input, then transmit to above-mentioned antenna output end from above-mentioned booster amplifier, when the power supply of above-mentioned video tape recorder cut-offs, supply with the above-mentioned antenna receiving signal of above-mentioned antenna input, then export from above-mentioned antenna output end by above-mentioned signal bypass loop.
2. the antenna pressurization mixing return circuit of putting down in writing according to claim 1, it is characterized in that between above-mentioned booster amplifier and above-mentioned antenna output end, connecting the mixing link, the output of an input of above-mentioned mixing link and above-mentioned booster amplifier is joined, another input is joined with the output that the regenerated signal of above-mentioned video tape recorder carries out the high-frequency modulator of high frequency modulated, and the output of above-mentioned mixing link is joined with above-mentioned antenna output end respectively.
3. according to claim 1 or 2 antenna pressurization mixing return circuits of being put down in writing, it is characterized in that at above-mentioned antenna input or above-mentioned antenna output end, have at least a side to need to change the change over switch that is connected with above-mentioned booster amplifier side or above-mentioned signal bypass side and join, above-mentioned change over switch is according to the connection of above-mentioned booster amplifier power supply/cut-off and change.
4. the antenna pressurization mixing return circuit of putting down in writing according to claim 3, it is characterized in that, above-mentioned change over switch is by 1 N type slot field-effect transistor (FET), be connected with the negative electrode of diode by the source electrode of bias resistance that is connected between above-mentioned field-effect transistor (FET) grid and source electrode and above-mentioned FET and 1 switch and form, the source electrode of above-mentioned FET is connected on above-mentioned antenna input and above-mentioned antenna output end, the anode of above-mentioned diode is by the input of above-mentioned booster amplifier, output and buffering resistance, be connected on the power supply of above-mentioned booster amplifier, the drain electrode of above-mentioned FET is connected on the above-mentioned signal bypass loop, when the power connection of above-mentioned booster amplifier, then above-mentioned diode current flow, above-mentioned FET cut-offs, and above-mentioned booster amplifier side is converted, when the power supply of above-mentioned booster amplifier cut-offs, then above-mentioned diode cut-offs, above-mentioned FET conducting, above-mentioned signal bypass loop is converted.
5. the antenna pressurization mixing return circuit of putting down in writing according to claim 4 is characterized in that above-mentioned N type slot field-effect transistor (FET), and its grid is to carry out ground connection by resistance.
6. the antenna pressurization mixing return circuit of putting down in writing according to claim 3, it is characterized in that form with diode jointly by a side and 2 switches of the opposing party of connection by negative electrode for above-mentioned change over switch, the common negative electrode that connects of above-mentioned 2 diodes, be connected above-mentioned antenna input and output, the anode of a wherein above-mentioned side's diode, input and output by above-mentioned booster amplifier, join with the power supply of above-mentioned booster amplifier, and the anode of above-mentioned the opposing party's diode, join with above-mentioned signal bypass loop, when the power connection of above-mentioned booster amplifier, a then above-mentioned side's diode current flow, above-mentioned the opposing party's diode cut-offs, above-mentioned booster amplifier side is converted, when the power supply of above-mentioned booster amplifier cut-offs, above-mentioned the opposing party's diode current flow then, above-mentioned signal bypass loop side is converted.
7. according to claim 1 or 2 antenna pressurization mixing return circuits of being put down in writing, it is characterized in that at above-mentioned antenna input or above-mentioned antenna output end, have at least a side to need to change the change over switch that is connected with above-mentioned booster amplifier side or above-mentioned signal bypass loop side and join, above-mentioned change over switch is according to the connection of above-mentioned booster amplifier power supply/cut-off and change.
8. the antenna pressurization mixing return circuit of putting down in writing according to claim 7, it is characterized in that above-mentioned change over switch is by 1 N type slot field-effect transistor (FET), form with being connected with the negative electrode of diode with 1 switch by the bypass loop resistance that connects between above-mentioned field-effect transistor (FET) grid and the source electrode at the source electrode of above-mentioned FET, the source electrode of above-mentioned FET, be connected on above-mentioned antenna input and the above-mentioned antenna output end, the anode of above-mentioned diode is by the input of above-mentioned booster amplifier, output and buffering resistance, receive on the power supply of above-mentioned booster amplifier, the drain electrode of above-mentioned FET is connected on the above-mentioned signal bypass loop, when the power connection of above-mentioned booster amplifier, then above-mentioned diode current flow, above-mentioned FET cut-offs, above-mentioned booster amplifier side is converted, and when the power supply of above-mentioned booster amplifier cut-off, then above-mentioned diode cut-off, above-mentioned FET conducting, above-mentioned signal bypass loop is converted.
9. the antenna pressurization mixing return circuit of being put down in writing according to Claim 8 is characterized in that above-mentioned N type channel fet, and its grid is to carry out ground connection by resistance.
10. the antenna pressurization mixing return circuit of putting down in writing according to claim 7, it is characterized in that form with diode jointly by a side and 2 switches of the opposing party of connection by negative electrode for above-mentioned change over switch, the common negative electrode that connects of above-mentioned 2 diodes, be connected on above-mentioned antenna input and output, the anode of a wherein above-mentioned side's diode, input and output by above-mentioned booster amplifier, be connected with the power supply of above-mentioned booster amplifier, and the anode of above-mentioned the opposing party's diode, join with above-mentioned signal bypass loop, when the power connection of above-mentioned booster amplifier, a then above-mentioned side's diode current flow, above-mentioned the opposing party's diode cut-offs, above-mentioned booster amplifier side is converted, when the power supply of above-mentioned booster amplifier cut-offs, above-mentioned the opposing party's diode current flow then, above-mentioned signal bypass loop side is converted.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11896196A JP3481388B2 (en) | 1995-08-30 | 1996-05-14 | Antenna booster mixer circuit |
| JP118961/96 | 1996-05-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1165412A true CN1165412A (en) | 1997-11-19 |
Family
ID=14749568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97104262A Pending CN1165412A (en) | 1996-05-14 | 1997-05-14 | Antenna pressurization mixing return circuit |
Country Status (5)
| Country | Link |
|---|---|
| KR (1) | KR970077814A (en) |
| CN (1) | CN1165412A (en) |
| DE (1) | DE19719946A1 (en) |
| FR (1) | FR2748883B1 (en) |
| GB (1) | GB2313238A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11164212A (en) * | 1997-11-28 | 1999-06-18 | Mitsumi Electric Co Ltd | Antenna booster circuit for vtr |
| KR20010013758A (en) * | 1998-04-16 | 2001-02-26 | 요트.게.아. 롤페즈 | Video recorder/reproducer apparatus |
| JP3526771B2 (en) * | 1999-02-05 | 2004-05-17 | シャープ株式会社 | RF modulator device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3440119A1 (en) * | 1984-11-02 | 1986-05-07 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Circuit arrangement for an image recording and reproduction apparatus |
| KR960008728B1 (en) * | 1992-09-30 | 1996-06-29 | Samsung Electro Mech | High frequency switching circuit of vcr |
| EP0679025B1 (en) * | 1994-04-21 | 2000-03-22 | Philips Patentverwaltung GmbH | Circuit arrangement for the feeding of an antenna signal |
| JP3481388B2 (en) * | 1995-08-30 | 2003-12-22 | アルプス電気株式会社 | Antenna booster mixer circuit |
-
1997
- 1997-05-01 GB GB9708798A patent/GB2313238A/en not_active Withdrawn
- 1997-05-06 KR KR1019970017231A patent/KR970077814A/en not_active Application Discontinuation
- 1997-05-13 DE DE19719946A patent/DE19719946A1/en not_active Withdrawn
- 1997-05-14 CN CN97104262A patent/CN1165412A/en active Pending
- 1997-05-14 FR FR9705902A patent/FR2748883B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| FR2748883A1 (en) | 1997-11-21 |
| GB2313238A (en) | 1997-11-19 |
| KR970077814A (en) | 1997-12-12 |
| DE19719946A1 (en) | 1997-11-20 |
| FR2748883B1 (en) | 1998-11-06 |
| GB9708798D0 (en) | 1997-06-25 |
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