JPH02260380A - Delay comperseting jack - Google Patents

Abstract

PURPOSE: To provide a jack assembly constituted of one jack with no intermediate loop provided therefor for use in a video receiver by interposing a switch mechanism and a delay circuit between its first conductor and second conductor. CONSTITUTION: A jack 40 comprises a housing body 42 constituted of a forward part 43 and a backward part 44. The backward part 44 of the jack 40 has jack couplings 52 and 53 constituting the first and the second coupler means respectively. Ports 46 and 48 are a standard port for receiving therein a coaxial plug. The backward part 44 includes a solid-state circuit element 68 constituted of a non-cable element employed as a delay line. The circuit element 68 is combined with spring conductors 64 and 66 to form a delay circuit 62. The level of delay is determined such that the circuit element 68 simulates a coaxial cable of a length equal to a predetermined length of a patch code to be used in the jack.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a delay compensation type jack, and is particularly suitable for use in a jack assembly used in a video transmitter.

2. Description of the Related Art The present invention is used for transmitting color video signals and the like. In a color video transmitter, the timing relationships of the various color signals dictate the arbitrary selection of their signal circuits, and therefore the performance of the video routing switches used to make the selection of said circuits is critical. Determined by If the timing relationships between the circuits are not accurate, the hues of the various video signals will not be accurate in relation to each other and recalibration of the signals will be required when they are selected. However, recalibration of the signals described above is nearly impossible to implement and is often problematic.

In order to be able to select the above-mentioned signals by means of a routing switch without recalibration, the various parts of the video equipment used are connected to all connected equipment when first starting broadcasting in a television studio. and routing switches to maintain proper timing relationships. One of the most important factors affecting the above timing relationships is the length of the coaxial video cable between each piece of equipment and the routing switch.

Varying the length or size of the coaxial video cable in a given circuit will affect the timing relationship of that circuit in relation to other circuits in the system.

While a broadcast is in progress, it may often be desirable to recirculate the television signal between the various elements and the broadcast equipment. For example, when first starting a broadcast, the broadcast equipment directs the signal from the television camera to a particular member of the video recording equipment using a routing switch. When a problem occurs in the video recording device during a broadcast period, it may be desirable to recirculate the signal to another video recording device.

To facilitate recirculation of the video signal, video jacks are connected between the various parts of the device. However, if signal path recirculation occurs during broadcast, the timing relationships of the devices must be preserved. .

When recirculating television signals between devices during a broadcast period, it is necessary to provide signals that do not have a timing relationship that would cause hue distortion. For this purpose, it is helpful to use a video jack in combination with a patch cord. A patch cord consists of a simple long cable with seven lugs on each end. To recirculate one signal, one plug of the patch cord is attached to the jack into which the signal is input, and
The other plug of the patch cord is connected to a jack located on a second device that recirculates the signal. In this way, when recirculating the signal, a cable (ie, batch cord) having the required length is connected to the system of the broadcasting device.

However, without compensation, the added cable length will cause hue distortion and require calibration.

Commercially available video jack field assemblies are:
Currently, cables of equal length to the length of the patch cord are incorporated into the jack assembly to provide compensation when installing the patch cord without the need for calibration.

An example of such a product is manufactured by ADC Telecommunications, Inc., Minneapolis, Minnesota, USA.
nc,), “Video Pro Patch M
It is sold under the trademark KI[''.

An example of the above product is “Professi”.
onalAudio and Video, Pr
on pages 24 and 25 of the April 1988 brochure published by NDC Telecommunications under the title ``Oducts''.

In the Video Pro Patch MKII, the jack circuit or jack assembly includes two jacks. The first jack receives the signal and the second jack transmits the signal to the required components of the video transmission device. The two jacks are connected by a long cable (considered as a compensating lobe) equal to the length of the patch cord used in the jack field. For example, “Vide.

The Pro Patch MKI has a 3-foot compensation lobe that is used with a 3-foot patch cord. If you need to install a 4-foot patch cord, The length of the compensation rope must be 4 feet; however, the NDC Telecommunications product, as described above, is designed to compensate for patch cords that are 3 feet long. Therefore, using a 4 foot long patch cord will result in a 6 degree phase shift.

Although phase-shifted or delay-compensated jacks such as the "Video Pro Patch MKII" have some functional advantages, they have their own drawbacks. For example, a jack assembly connected by a three foot coaxial cable requires two jacks, which makes the jack section large and expensive. Therefore, there is a need for improvement in the conventionally provided delay compensation type jacks, regardless of their functional satisfaction.

Next, in order to facilitate understanding of the present invention, the prior art will be explained in detail with reference to FIGS. 1 to 4.

Figure 1 shows the official record A D CV 1deo Pro Pat
A conventional jack assembly, such as a ch MKII, is shown. The jack assembly 1 comprises two jacks 20.20°. 20 jacks each
．． 20° has the same shape, jack 20 is jack 20
is structurally located above the jack 20.20
' is mechanically connected to the front panel 6 of the housing 8. The housing 8 includes a rear panel 10 spaced from the front panel 6.

Jacks such as Jack 20.20' are designated by product name 5.
J100O, manufactured by NDC Telecommunications. June 1988
An example of a jack is disclosed in more detail in US Pat. No. 4,749,968, issued May 7th. (The jack represents an improved version of the prior art 5J100O.

) The jack 20.20° is provided with a front boat 50.50° located through the front panel 6.

At the rear of the jack 20.20' is a pair of coaxial cables.
Coaxial cable connectors 55 and 55' are provided within the housing 8.
A compensating lobe 24 consisting of a coaxial cable extending between is attached.

A pair of jack couplings 26.26° are mounted on rear panel 10, with jack couplings 26 coupled to cable connector 54 via coaxial cable 30. Similarly, coupling 26' is connected to cable connector 54' via coaxial cable 30'.

Boat 50.50°, as known in the art
is provided for inserting a coaxial plug. Also,
As is known in the art, the jack coupling 26, 26' is a BNC type connector into which a plug into which a coaxial cable is inserted is inserted.

In U.S. Pat. No. 4,749,968,
．． A brief description of the internal structure of the 20° jack is provided.

The reference numerals used in the following three paragraphs are the same as those in the drawings and specification of U.S. Pat. No. 4,749,968.

The best prior art reference is disclosed in Figure 2 of said US patent, in which the jack is shown in cross section. (In addition, in the jack shown in Figure 2 of the patent,
Cable connector 54.54 on the rear body of the jack
' is not provided, but a BNC type connector is attached directly to the jack body. ) As shown in FIG. 2 of the above-mentioned U.S. patent and FIG.
50 and 158 are arranged.

The conductor 150 extends from the front boat 5o to the rear BNC type connector 54. A conductor 158 extends from the second BNC type conductor and is disposed substantially parallel to conductor 150. conductors 150 and 1
A V-shaped spring conductor 164 is disposed between the conductors 58 and 58 .

A switch assembly 156 is provided with a cam surface that engages a plug inserted into the boat 50. Engagement of the cam surface with a plug inserted into the boat 5o urges the spring conductor 164 out of electrical contact with the conductor 150.

FIG. 11 of the above-mentioned US patent discloses various mechanical elements corresponding to the plug inserted into the boat 50 and their relationships.

In the jack disclosed in that patent, from a cable inserted and installed without a plug in the boat 50, through a conductor +50 to a BNC type connector 54, through a spring conductor +64 to a conductor 158, It also sends electrical signals to a coaxial cable connected to another rear BNC type connector. Upon insertion of the plug into boat 50, the electrical connection between spring conductor 164 and conductor 150 is broken. Accordingly, the signal passes from the coaxial cable connected to the BNC connector 54, through the conductor 150, and to the coaxial cable connected within the boat 50 via the plug. Activation of switch mechanism 156 prevents the signal from passing through conductor 158 .

Another embodiment of the product in which there are two front boats 50 is disclosed in FIG. 8 of the aforementioned US patent.

In this embodiment, switch 156 is actuated by insertion and removal of a plug into both forward boats 50.

To explain the operation of the prior art shown in FIGS. 1 to 4 above,
In FIG. 1, dotted line A indicates the signal path through jack assembly 1. In FIG. In the structure shown, the gloss coupling 26 is at the input port and the jack
Coupling 26 is the output boat. The signal from one device of the transmission facility, for example a television camera,
The jack coupling 26 is powered via a coaxial cable. The signal from the television camera is route A.
It passes through and is output from the output boat 26°. The output port 26° sends the signal via a coaxial cable to the next broadcast device, such as a video recorder.

Batch codes are used when it is desired to recirculate the signal to another video recorder different from the one described above. FIG. 2 illustrates an example of the jack assembly of FIG. 1 in which batch code 36 is used.

2, batch cord 36 includes a coaxial cable 38 extending between plugs 41 and 42. In FIG. Plug 41 is inserted into boat 50 and plug 42 is attached to the boat of another jack assembly (not shown).

Insertion of the plug 41 into the boat 50 is accomplished by a jack switch mechanism (fully disclosed in U.S. Pat. No. 4.74.9,968) that connects the jack coupling 26.
The signals from the . . . , . . . , are propagated to and circulated through the batch code 36, as shown by dotted line B.

Upon switch activation of the jack, no signal passes through the compensated rope 24 or the jack coupling 26'.

When installing the batch coat 36 in a video broadcast system, if no action is taken, a phase shift will occur in the video signal that will manifest as visible hue distortion. To prevent this, the compensating rope 2
4 is selected to be the same length as batch code 36. As a result, the compensated rope 24 and the batch code 3
6 electrical characteristics (features such as phase shift) are matched.

Since the compensating rope 24 is a front-mounted element, a person using the jack assembly l or the technology in which it is incorporated must:
A restricted patch cord 36 with a length equal to the length of compensating rope 24 must be used. Generally, batch cords and compensating ropes are approximately 3 feet long, but may be 4 feet or any other length.

If a batch cord is installed in the boat 50 to receive signals from the jack coupling 26, the user of the jack assembly must also install a batch cord in the boat 50.
You can attach the code. In this case, a new signal is input through the jack coupling 26' and the signal is sent through the jack 20', while the jack 20
The signal from is blocked.

The electrical behavior of the prior art jack assembly l is shown in Figures 3 and 4. 3 and 4 schematically show a jack assembly I of the prior art (FIG. 3) and an electrical circuit of the jack assembly (FIG. 4). It is listed in parallel. As shown in FIG. 4, a first conductor 50 extends from the boat 50 to a cable conductor 54. A conductor 158 extends from connector 55 to switch member 156.

A conductor 158 is connected to conductor 150 by a spring conductor 16.1.

The second jack 20° has the same internal elements as the jack 20, and identical parts are marked with (゛).

The entire jack system is grounded as shown by dotted line 165. Compensated rope 24 is connected to cable connector 55.55°.

SUMMARY OF THE INVENTION In a preferred embodiment of the invention, a compensated jack connects a first, second and third boat to an eleventh, second and third respective coaxial cable. We are prepared.

The first signal path is provided in a jack for electrically connecting the first cable and the second cable, and the first cable is connected to the first boat, and the second cable is connected to the second boat. Ru. The second signal path connects the first cable to the third
It is provided in a jack for electrically connecting cables, said cables being connected to the first boat and the third boat, respectively. The first signal path includes circuitry selected to induce a signal compensation in the signal passing through the first signal path. A switch mechanism is provided to open the first path when the third cable is connected to the third boat.

Hereinafter, the jack according to the present invention will be explained with reference to the drawings from FIG. 5 onwards.

5 to 7, a jack 40 according to the present invention is shown, which includes a front portion 43 and a rear portion 4.
A housing body 42 having a diameter of 4 is provided. Said front part 43 comprises boats 46, 48 constituting third and fourth connection means, respectively, and a mounting flange 51 for attaching said jack 40 to the front wall (not shown) of the jack field housing. There is.

The rear portion 44 of the jack 40 has first and second portions, respectively.
Jack coupling 52.53 constituting the connection means
It is equipped with The jack coupling 52 is arranged coaxially with the boat 46. Similarly, Ja Tsuku
The coupling 53 is arranged coaxially with the boat 48. The Boat I-46.48 is a standard boat for accepting coaxial plugs. jack coupling 52
．． Reference numeral 53 is a BNC type connector, which accepts an ordinary coaxial cable plug-in type connector.

The first conductor 150 is connected to the housing body 42 coaxially with the boat 46 and the jack coupling 52.
It extends through the axial direction.

Similarly, a second conductor +58 is arranged coaxially with the boat 48 and jack coupling 53 and extends through the housing body 42. The first conductor 150 and the second conductor 158 are of the type described in the aforementioned US Pat. No. 4,794,968. A switch mechanism 15G and a delay circuit 62 are arranged between the parallel first conductor 150 and second conductor 158 in the housing body 42. The delay circuit 62 and switchboard 4A I 56 are shown in FIG. 13 with the rear portion 44 of the housing body 42 removed and the first conductor 50 and second conductor 158 removed. There is.

The delay circuit 62 has a first spring conductor 64 and a second spring conductor 64.
A spring conductor 66 is provided. The first and second spring conductors 64,66 are mirror images of each other and include spring contact portions 64a, 66a and a strip conductor 64b166b integrally connected to the spring contact portions 64a, 66a, respectively. For ease of illustration, the second spring conductor 66 is shown separately in FIG. (The above first spring conductor 6
The fourth and second spring conductors 66 are to be contrasted with the spring conductors 164 of Moeki U.S. Pat. No. 4,749,968, in which two spring conductors extend directly between parallel conductors. for a direct electrical connection. ) As shown in FIGS. 7 to 12, the first spring conductor 64 and the second spring conductor 66 have spring contact portions 64a and 66a connected to the first conductor 15, respectively.
0, and is arranged to elastically abut against the second conductor 158. The strip conductors 64b, 66b are connected to the housing body 4 rearwardly from the spring contact portions 64a, 66a.
2 into the rear portion 44 of 2. In addition, the strip conductor 6
4b566b extends to the upwardly protruding tabs 64c and 66c.

A solid state circuit element 68 consisting of a non-cable element constituting a delay line is disposed in the rear portion 44, and the circuit element 68 includes a first lead 68a and a second lead 68.
It is equipped with 8b. The first lead 68a is the tab 64c.
Similarly, the second lead 68b is electrically connected to the tab 66c. Circuit element 68 is the third
A lead (not shown) is provided, and the third lead is grounded via appropriate means. (eg, connecting the third lead to housing body 42). A delay circuit 62 is formed by the combination of spring conductors 64, 66 and circuit element 68 as described above.

The switch mechanism 156 is described in U.S. Pat. No. 4,749, discussed above.
It may also be of the type disclosed in No. 968. As shown in FIG. 13, the switch mechanism 156 is approximately V
a conductor 70 having a shape of 7°, the conductor 70 having a first
It includes an arm section 72 and a second arm section 74, with free ends of the first arm section 72 and the second arm section 74 facing the spring contact sections 64a and 66b, respectively. The first arm 72 and the second arm 74 are held between insulating columns 200 and 201, respectively, so that they do not spread too far apart.

The second arm 72 is provided with a pad 76 made of an insulating material, and the pad 76 serves as a cam surface, as will be described later. Similarly, the second arm 74 has a pad 7 that acts as a cam surface.
It has 8. The putts are 76 and 78 respectively for the above boat 4.
6.48. The switch mechanism 156 is disclosed in U.S. Pat.
．． No. 749,968 has the same function. That is, by inserting the plug 6I into the boat 46, the plug 6I engages with the pad 76, and the first arm 72
The free end of the spring contact portion 64a is electrically and mechanically connected to the spring contact portion 64a. Therefore, the spring contact portion 64a is no longer electrically connected to the first conductor 150. The free end of the first arm portion 72 acts as a pushing point for pushing the spring contact portion 64a. The arrangement as described above is shown in FIG.

The state of the jack 40 according to the invention when no plug is inserted into the boat 46, 48 is shown in the schematic circuit diagram of FIG. The state of the invention when the plug 6I is inserted into the boat 46 is shown in the schematic circuit diagram of FIG.

As shown in FIG. 6, if both boats 46, 48 are unplugged, the spring conductor 64
is electrically connected to the first conductor 150 at a contact point C. Similarly, the spring conductor 66 has a second contact point.
It is electrically connected to the conductor 158. A first signal path then extends between jack coupling 52 and jack coupling 53. That is, the signal is transmitted from the bright coupling 52 to the first conductor 1.
50 to contact C, spring conductor 64, and further circuit element 68, spring conductor 66.
to the contact point via the second conductor 15.
8 to the jack coupling 53.

If the boat 46.48 is not plugged, neither the first arm 72 nor the second arm 74 of the switch mechanism 156 is electrically connected to the spring conductor 64.66. However, the plug either on the boat (
For example, when inserted into a boat 46 ), the plug engages the camming surface of the pad 76 and biases the first arm 72 into contact with the spring conductor 64 . As the pad 76 continues to be pushed forward by insertion of the plug, the spring conductor 64 is moved diagonally and contacts C are opened and cut. When contact C is cut as above,
The signal passes directly through the second signal path, i.e. through connector 5.
2 to the boat 4G via the first conductor 150. The state of the above circuit is shown in Figure 1+.

6 and 11, the jack housing body 42 is connected to ground 82 as shown by dashed line 80. In FIGS. Switch mechanism 156 is connected to ground 82 via resistor 84.

The resistance value of the resistor 84 is preferably 75 ohms. However, those skilled in the art will appreciate that the resistance value of the resistor 84 may have a value other than that described above.

In the embodiment described above, the jack 40 has two boats 46.
48 in the front part. In another embodiment shown in FIG. 8, only one boat 46 is provided. In this embodiment, the second conductor 158 is the conductor 1 of FIG.
As shown at 58゛, it is shorter. Also, the 8th
In the embodiment shown, the jack coupling 52.5
3 has been replaced with coaxial cables 52' and 53', and the cables 52' and 53' are each connected to a conductor 150.
．． It is directly connected to 158°. In all other aspects,
The jack of FIG. 8 is similar to jack 40 of FIG.

As mentioned above, delay circuit 62 includes a combination of spring conductors 64, 66 and circuit element 68. The circuit element 68 is a delay line, such as a product named the "ST Series" by ESC Electronics, Corp. of New Chassis, Palisades Park;
Published in the ``Delay Lines and Transformers'' catalog of p.

Circuit element 68 is adapted to delay signals passing therethrough. The amount of delay is determined by the circuit element 68
It is chosen to simulate a length of coaxial cable equal to the predetermined length of the patch cord used with the jack. For example, if a 3 foot batch cord is used, circuitry 68 is preferably set to provide a delay equal to the time it takes for the signal to pass through the 3 foot batch cord. has been done.

The above time is about 5.5 nanoseconds.

7. If using a 4 foot patch cord.
A delay of 3 nanoseconds is appropriate, and circuitry 68 should also be configured to provide a delay of this length. Circuit element 68 is manufactured by ESC Electronics, Corp.
These are commercially available, such as series miniature signal delay lines, and as such do not form part of the present invention.

As noted above, the configuration of the present invention allows jack 40 to be used in place of conventional jack assemblies for cross-connecting video equipment. The jack is operated in three modes.

In the first mode of operation, as shown in Figure 5, when the patch cord is not attached to the jack, in that case the signal is not recirculated and the signal path at this time is the dashed line in Figure 5. Indicated by E. The television signal enters jack coupling 52 and passes through a first signal path (from jack coupling 52 to contact C and then to circuit element 6
8 to the contact point, and further the jack coupling 5
3).

In the second mode of operation (operating with one batch code installed), the plug is inserted into either boat 46,48. For example, when the plug is inserted into the boat 46, the delay circuit 62 is connected to ground via the switch mechanism 156 and the resistor 84. The signal passes directly from the jack coupling 52 via the first conductor 150 to the jack plug 61 inserted into the boat 46. This second signal path is indicated by dashed line F in FIG.

In addition to the above operating modes, the jack 40
．． It can be used in a dual batch mode of operation where both 48 are plugged.

In the dual patch mode of operation described above, the signal from jack coupling 52 is passed directly to boat 46. Similarly, the signal input to the boat 48 is directly connected to the jack.
The signal is transmitted to the coupling 53.

With the structure and operation of the present invention described above, the advantages of the present invention over the prior art are obvious. Conventional jack assemblies required two jack bodies connected by an intermediate cross-connecting loop (compensated loop), typically three feet long. The structure described above has been improved in the present invention to consist entirely of one jack without an intermediate loop. The advantages of this improvement are evident simply by looking at FIGS. 3 and 5. The overall length (for example, the length from the boat 50.50° in the front part of the conventional jack to the jack coupling 26.26° in the rear part of the conventional jack shown in Figure 3) is significantly reduced as shown in Figure 5. be done.

Similarly, the intermediate compensating loop (typically 3 feet long) is not required. Furthermore, what conventionally required two jacks can be replaced with one jack body. An advantage of the design of the present invention is that it reduces labor and material costs as well as greatly reduces the size of each circuit implementation. Because each jack mount includes a significant number of jack assemblies, the total cost and physical size of all jack mounts is significantly reduced.

The above detailed description of the invention shows how the objects of the invention are achieved by a preferred apparatus.

However, variations and equivalent substitutions from the disclosed concept that are readily apparent to those skilled in the art are included within the technical scope of the present invention as long as they do not depart from the scope of the claims.

[Brief explanation of drawings]

FIG. 1 is a drawing showing a conventional jack assembly, FIG. 2 is a drawing of the conventional example of FIG. 1 with a patch cord added, FIG. 3 is a drawing showing a conventional compensated jack assembly, and FIG. 4 is a schematic circuit diagram of the jack assembly of FIG. 3, FIG. 5 is a plan view of the jack according to the present invention, and FIG.
5 is a schematic circuit diagram of the assembly of FIG. 5, FIG. 7 is a sectional view of the jack of FIG. 5, FIG. 8 is a sectional view of another embodiment of the jack of FIG. 7, and FIG. 9 is a sectional view of the jack of FIG. Figure 1O is a diagram showing a state in which a patch cord plug is inserted into the jack boat shown in Figure 5. Figure 10 is a diagram showing a patch cord plug inserted in the jack boat in Figure 5. Fig. 1O is a circuit diagram of the jack showing a state in which an electric circuit is opened and closed by a plug inserted into the jack, Fig. 12 is a front view of the spring conductor used in the jack according to the present invention, and Fig. 13 is a rear view. 8 is a cross-sectional view of the jack of FIG. 7 with parts and internal elements removed; FIG. 40...Jack, 42...Housing body, 46.48...Boat, 52.53...Jack coupling, 62...
Delay circuit, 68...Circuit element, 64.66...
Spring-conductor, 150.158...Conductor, 156...Switch means, E...First signal path, F...Second signal path. Patent Applicant: ADC Telecommunications, Inc.

Claims (1)

[Claims] 1. A first connecting means for connecting to a first coaxial cable, a second connecting means for connecting to a second coaxial cable, and a third connecting means for connecting to a third coaxial cable. a third means for electrically connecting the first cable to the second cable when the first cable and the second cable are respectively connected to the first connecting means and the second connecting means; a first signal path for electrically connecting the first cable and the third cable when the first cable and the third cable are respectively connected to the first connecting means and the third connecting means; a second signal path; and a switch means for opening the first signal path when the third cable is connected to the third connection means, and the first signal path is configured to connect the first signal path to the first signal path. said third cable has predetermined electrical characteristics, said circuit means being selected to induce a predetermined signal compensation in the signal passing therethrough, said circuit means said said first signal path having said predetermined electrical characteristics; A delay-compensated jack with non-cable elements selected to have electrical characteristics similar to the electrical characteristics. 2. The jack of claim 1, wherein the length of the third cable is known and the circuit means is selected to induce a delay of a selected period corresponding to the length of the third cable. . 3. The jack of claim 2, wherein said circuit means are selected to induce a delay equal to the length of time required for a signal to travel the length of said third cable. 4. The jack of claim 3 wherein said third cable is approximately 3 feet long and said circuit means is selected to induce a delay of approximately 5.5 nanoseconds. 5. The jack of claim 3 wherein said third cable has a length of approximately 4 feet and said circuit means is selected to induce a delay of approximately 7.3 nanoseconds. 6. said first signal path comprises normally closed circuit contacts movable to an open position to prevent transmission of signals through said first signal path; said switch means for placing said circuit contacts in said open position; 2. The jack of claim 1, further comprising means responsive to a cable coupled to the third connecting means for energizing the cable. 7. The switch means comprises a push member having a cam surface and a push point, the cam surface being arranged to engage the connection of the cable to the third connection means, the push point being the normally closed 7. The jack of claim 6, wherein the circuit contacts are arranged to engage the cam surface and bias it to the open position. 8. The jack includes a jack body including a first conductor extending from the first connecting means to the third connecting means and a second conductor extending from the second connecting means; and a second conductor, the first
a delay circuit having a first spring contact resiliently biased into engagement with a conductor; and a delay circuit element disposed in the delay circuit, wherein the first conductor extends from the second conductor. The second conductor is arranged to be spaced apart and in electrical contact with the respective cables connected to the first and third connecting means, and the second conductor is in electrical contact with the cables connected to the second connecting means. Claim 7 arranged so as to connect.
Jack as described. 9. The jack according to claim 7, wherein the pressing point is an electrical conductor and is electrically connected to ground via a resistor. 10. The jack body comprises four connecting means for connecting with four coaxial cables, and the second conductor extends from the second connecting means to the fourth connecting means, and the second conductor extends from the second connecting means to the fourth connecting means, and the second conductor extends from the second connecting means to the fourth connecting means. said delay circuit comprises a second spring contact resiliently biased into engagement with said second conductor, said delay circuit element being arranged in electrical connection with a cable connecting said delay circuit element to said second conductor; 9. The jack of claim 8, wherein the jack is electrically connected to the first and second spring contacts. 11. four connecting means for connecting with the four coaxial cables; the second cable and the fourth cable are connected to the second and fourth cables;
When connected to the connecting means, the second cable and the fourth
a third signal path for electrically connecting the cable, and the switch means includes means for opening the first signal path when the fourth cable is connected to the fourth connection means. The jack according to claim 1. 12. The first signal path includes a portion electrically connected to the second cable when the first signal path is opened, and the switch means is configured to connect the third cable to the third connection means. 2. The jack according to claim 1, further comprising means for electrically connecting said portion to ground via a resistor when connected. 13. The jack according to claim 10, wherein said switch means includes means for opening said first signal path when said fourth cable is connected to said fourth connection means. 14. The first signal path includes a portion connected to the cable when the first signal path is opened, and the switch means connects the portion to the cable when the first signal path is opened. 14. A jack according to claim 13, further comprising means for connecting to electrical ground via a resistor. 15. a jack body comprising first, second and third conductor connection means for receiving first, second and third electrical signal conductors, respectively; a first signal path for electrically connecting the first conductor and the second conductor when connecting with the first and second connecting means; and a first signal path for electrically connecting the first conductor and the second conductor; a second signal path for electrically connecting the first conductor and a third conductor when connected to the means; the length of the third cable is predetermined, and the circuit means is configured to change the length of the third cable to be similar to the electrical characteristics of the signal passing through the third signal path; A delay-compensated jack having non-cable circuitry selected to induce a delay in the signal of a correspondingly selected period of time. 16. The jack according to claim 15, further comprising switch means for opening said first signal path when said third cable is connected to said third connection means. 17. a jack body having first, second and third connection means for respectively receiving first, second and third cables; When the three cables are connected to the first and third connecting means, respectively, the first
a first conductor electrically connected to the cable and a third cable; a second conductor disposed within the body and electrically connected to the second cable when the second cable is connected to the second connection means; and a delay circuit disposed within the jack and electrically connected to the first and second conductors, the delay circuit configured to induce a delay in a signal passing between the first and second conductors. A delay compensating jack comprising a selected non-cable element, the delay being selected to be a predetermined period of time corresponding to a predetermined length of the third cable. 18. The compensated jack of claim 17, wherein said circuit element is an electrical delay line. 19. A compensated jack according to claim 18, further comprising switch means for blocking the flow of signals through said delay circuit when a third cable is connected to said third connection means. 20, the delay circuit includes a first delay circuit in the jack body;
a spring contact and a resiliently biased portion into engagement with the first conductor, the delay element having a first spring contact to the second conductor such that a signal passes through the delay element; 20. The compensated jack of claim 19, wherein the switch element comprises means for connecting a third cable and the third conductor apart from the first spring contact and the first conductor.