Multiplex communications – Diagnostic testing – Path check
Patent
1995-06-19
1998-05-26
Olms, Douglas W.
Multiplex communications
Diagnostic testing
Path check
34082506, 34082536, 370242, 370257, 379269, H04J 116
Patent
active
057577773
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electronic device system for use in inspecting AV devices (audio/video devices) and inspecting the connected states thereof the invention including electronic devices applied to the electronic device system, an inspecting apparatus and a state setting apparatus.
BACKGROUND ART
When television receivers are manufactured, inspection of substrate level has heretofore been carried out by using a pin jig and an internal bus, such as an I.sup.2 C bus. Moreover, assembled television receivers also are inspected by using the I.sup.2 C bus.
When the television receiver is used as an AV center to which other AV devices such as VTRs are connected, the, AV devices are connected by an external bus, such as a D2B bus so that the respective systems can be controlled individually. To this end, each AV device incorporates a circuit shown in FIG. 16, for example.
Specifically, each AV device includes two sockets (11), (12) to connect it to the D2B bus. The socket (11) includes terminals (11a), (11b) and (11c) connected to balancing signal lines (13), (14) and a ground line (15). Similarly, the socket (12) also includes terminals (12a), (12b) and (12c) connected to the balancing signal lines (13), (14) and the ground line (15).
A current control circuit (19) of a D2BIC (24) is connected between a predetermined voltage source and the balancing signal line (13) and outputs a positive balancing signal to the balancing signal line (13) under the control of a control unit (23) via a transmission and reception buffer (22). A current control circuit (20) is connected between the balancing signal line (14) and a ground potential. The current control circuit (20) outputs a negative balancing signal to the balancing signal line (14) under the control of the control unit (23). A comparing circuit (21) detects the positive and negative balancing signals supplied to the balancing signal lines (13) and (14) and outputs a detected result through the transmission and reception buffer (22) to the control unit (23). The control unit (23) of the D2BIC (24) is connected to a CPU (25) which controls operations of the AV devices.
A resistor (16) is connected between the balancing signal lines (13) and (14) through a switch (17) or (18). The switch (17) is constantly set in its on state and turned off when a plug of the D2B bus (2) is connected to the socket (11). The switch (18) also is constantly set in its on state and turned off when the plug is connected to the socket (12).
FIG. 17 shows the connected state of an AV center (e.g., television receiver) (31) and a VTR (32) as the system. In this example, the terminals (11a) through (11c) of the socket (11) of the AV center (31) are connected through the D2B bus (2) to the terminals (11a) through (11c) of the socket (11) of the VTR (32).
In the example of FIG. 17, the D2B bus (2) is connected to the socket (11) of the AV center (31) and therefore the switch (17) of the AV center (31) is turned off. The D2B bus (2) is not connected to the socket (12) and therefore the switch (18) remains turned on.
Similarly, also in the VTR (32) side, while the D2B bus (2) is connected to the socket (11) so that the switch 17 is turned off, the D2B bus (2) is not connected to the socket (12) so that the switch (18) remains turned on.
Specifically, in this example, the resistor (16) of the AV center (31) is connected in the connection path composed of the terminal (11a) of the socket (11), the D2B bus (2), the terminal (11a) of the socket (11) of the VTR (32), the resistor (16), the switch (18), the terminal (11b) of the socket (11), the D2B bus (2), the terminal (11b) of the socket (11) of the AV center (31) and the switch (18).
FIG. 18 shows the state that the VTR (32) is connected to the AV center (31) to which a VTR (33) is further connected. Specifically, in this example, the VTR (32) is connected to the AV center (31) similarly to FIG. 17 and the terminals (12a) through (12c) of the socket (12) of the AV center (31) are connected through the D2B bus (2)
REFERENCES:
patent: 3769593 (1973-10-01), Williams
patent: 4194090 (1980-03-01), Yabe et al.
patent: 4507652 (1985-03-01), Vogt et al.
patent: 4916432 (1990-04-01), Tice et al.
patent: 5073919 (1991-12-01), Hagensick
patent: 5111497 (1992-05-01), Bliven et al.
patent: 5130793 (1992-07-01), Bordry et al.
patent: 5325376 (1994-06-01), Ushio et al.
patent: 5550978 (1996-08-01), Takahashi et al.
Hom Shick
Maioli Jay H.
Olms Douglas W.
Sony Corporation
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