JPS5932030Y2 - signal distribution circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal distribution circuit that is optimal as an input circuit for, for example, a stereo tape recorder.

FIG. 3 shows a conventional example of this type of signal distribution circuit as an input circuit for a stereo tape recorder.

In the same figure, there are two jacks J1. J2 is the one into which the plug of a microphone (not shown) is inserted and removed, and when the plug is inserted, there are contact points al that contact the tip of the plug,
a2 and the contact point a1, a contact point b1. away from a2.
b2 respectively.

When no microphone plug is inserted into either jack Jl or J2, the two line signals connected to contacts bl and b2, for example, the L signal and R signal of an FM receiver, are input to the L input amplifier of a stereo tape recorder. A
1 and R input amplifiers A2, respectively.

On the other hand, when microphone plugs are inserted into jacks Jl and J2vc, the output of the microphone inserted into jack Jl is sent to L input amplifier A1, and the output of the microphone inserted into jack J2 is sent to R input amplifier A2. is input, and stereo recording is performed using a microphone.

By the way, in this signal distribution circuit, jack J1. J2
For example, if a microphone plug is inserted only into one of jacks J, the output of the microphone connected to jack J is input to L input amplifier A1, but R
The line signal connected to contact b2 is still input to the side input multiplier A2.

Therefore, when there is only one microphone, the input circuit of R input amplifier A2, etc. must be opened by other means.
There is a drawback that the receiver signal and microphone signal are recorded mixedly, and even if you want to record monaurally with a microphone, prepare two microphones and plug them into both jacks JISJ2. It has the disadvantage that it must be inserted and handling is complicated.

Therefore, the present invention provides a signal distribution circuit with a new configuration that eliminates the above-mentioned drawbacks, and its gist is that the first and second jack terminals
A, ■NB, and the first and second input terminals IN1. IN
2 and the first jack terminal INA through a signal transmission path that is conductive when the plug is inserted into the first jack terminal INA.
the first output terminal 0UT1 connected to NA;
and a second output terminal 0UT2 connected to the jack terminal N3 via a signal transmission path that is conductive when the plug is inserted into the jack terminal INB, and the plug is inserted into the first jack terminal INA. When the plug is inserted, the first input terminal IN and the first output terminal 0 are
The above-mentioned terminals INl and 0UT1 are connected through a switch circuit S2 which makes the signal transmission path with UT1 non-conductive, and when the plug is inserted into the above-mentioned jack terminals NA and INB, both of them are unplugged. The respective terminals IN2 and 0UT2 are connected through a switch circuit S1+84 which brings into conduction the signal transmission path between the second input terminal IN2 and the second output terminal 7'0UT2 in the inserted state. , in conjunction with the insertion of the plug into the second jack terminal NB, and when the plug is inserted, the signal transmission path between the first jack terminal NA and the second output terminal OUT is brought into a non-conducting state. The above terminals INA and 0U are connected to each other via the switch circuit S3.
It is in a signal distribution circuit that connects OUTz.

Next, the present invention will be specifically explained with reference to FIG.

In the figure, Sl, S2. S3. S4 is the first
．． Second. Third. The fourth switches ■NA and ■NB are respectively the first. The second jack terminals, INl and IN2, are connected to the first jack terminals, INl and IN2, respectively. The second input terminals, 0UTl and 0UT2, are the first and second input terminals, respectively. This is the second output terminal.

The first switch S1 is a normally closed switch, and when a signal input plug is inserted into the first jack terminal NA, its movable contact co separates from the normally closed fixed contact C1 and opens.

The second switch S2 is a two-contact switch having a normally closed fixed contact d1 and a normally open fixed contact d2, and when the signal input/lug is inserted into the first jack terminal hole NA, its movable contact aO is normally Switching contact is made from the closed fixed contact d1 to the normally open fixed contact d2.

The third switch S3 is a normally closed switch, and when the signal input plug is inserted into the second jack terminal ■NB, its movable contact e□ separates from the normally closed fixed contact e1 and opens.

The fourth switch S4 is a two-contact switch having a double-open fixed contact f1 and a normally open fixed contact f2, and has a second jack terminal l.
When the signal input plug is inserted into N13, its movable contact fo switches from the normally closed fixed contact fl to the normally open fixed contact f2.

The first jack terminal IN is connected to the normally open fixed contact d2 of the second switch S2 and the normally closed fixed contact el of the third switch S3.
NB is connected to the normally open fixed contact f2Vc of the fourth switch S4, and the second input terminal ■N2 is connected to the first switch S1.
The first input terminal IN is connected to the movable contact co of the
The first output terminal OUT1 is connected to the normally closed fixed contact d1 of the switch S2, and the first output terminal OUT1 is connected to the movable contact d1 of the second switch S2.
o, and the second output terminal 0UT2 is the movable contact e□ of the third and fourth switches S3+84.

foI/c is connected, and the normally closed fixed contact of the first switch Sl (1'l is the normally closed fixed contact f of the fourth switch S4)
It's close to 1.

However, the first. second jack terminal INA;

■When a signal input plug is not inserted into any of the NBs, the signal supplied to the second output terminal IN2 is distributed to the second output terminal 0UT2, and the signal supplied to the first input terminal ■N1 is distributed to the second output terminal IN2. is distributed to the first output terminal OUT.

1st. When signal input plugs are inserted into the second jack terminals INA and ■NB, the signal supplied through the plugs inserted into the first jack terminal INAK is
Output terminal 0UTIYc distribution Now the second jack terminal ■
The signal supplied via the plug inserted into the NB is distributed to the second output terminal 0UT2.

In this case, 1. Second input terminal ■N1. ■The signal supplied to N2 is sent to the first and second output terminals 0UT1, 0UT2.
It is not distributed to any of the following.

Next, when a signal input plug is inserted only into the first jack terminal INAK without inserting a signal input plug into the second jack terminal INB, the signal input plug is inserted into the first jack terminal INB.
The signal supplied through the NAK inserted plug is the first one.
It is distributed to both the second output terminals OUT1, 0UT2.

In this case as well, 1. Second input terminal ■N1. ■The signal supplied to N2 is the first signal. a second output terminal OUT;

It is not distributed to 0UT2.

Also, if you insert a signal input plug only into the second jack terminal INB without inserting a signal input plug into the first jack terminal NA, the second jack terminal INH
The signal connected to the first input terminal IN1 is distributed to the second output terminal OUT2, and the signal connected to the first input terminal IN1 is distributed to the first output terminal OUT1.

In this case, the signal connected to the second input terminal ■N2 is the signal connected to the first input terminal ■N2. No signal is applied to any of the second output terminals 0UT10UT2.

That is, in the embodiment having the above-described configuration, each of the switch circuits S l and S 2 operates in conjunction with the insertion of a plug into the first and second jack terminals INA and ■NB.
, S 3 t S 4, each output terminal 0UT1.0
Each jack terminal IN for UT2VC.

The connection states of IN and input terminals IN and IN can be switched as shown in Table 1.

In Table 1, - indicates that either a conductive or non-conductive state is acceptable, and ☆ indicates that there is no connection relationship.

Therefore, the signal distribution circuit of the present invention as described above is used, for example, as an input circuit of a stereo tape recorder. The second output terminals OUT, OUT2 are connected to the input terminals of an L channel input amplifier and an R channel input amplifier of a stereo tape recorder, respectively. Second input terminal ■N1. IN2 has a stereo line signal such as F.
M receiver's L and R signals are supplied, and the first. 2nd jack terminal ■NA.

Assuming that each microphone signal is supplied to INBK, it will operate as follows.

1. When the microphone is not used, the LR signals of the FM receiver as stereo line signals supplied to the first and second input terminals IN, IN2 are respectively input to the L and R channel input amplifiers. Recorded in stereo.

Next, when trying to record in stereo using two microphones, the output signal of the L side microphone is supplied to the first jack terminal INA, and the output signal of the R side microphone is supplied to the second jack terminal INB. Stereo recording is achieved.

In addition, when only one microphone is prepared or when trying to make monaural recording using a microphone, if the output signal of one microphone is supplied to the first jack terminal INA, the output signal of the microphone will be set to L. −
It is equally distributed to the R channel input amplifier for monaural recording.

1. If only the output signal of one microphone is supplied to the first jack terminal INA, the FM receiver L-R signal connected to the first and second input terminals INl and IN2 will be mixed in. Monaural recording using a microphone can be performed without any inconvenience.

Further, if the output signal of the microphone is supplied to the second jack terminal INB, the output signal of the microphone is supplied to the L channel input amplifier and recorded on the L track of the magnetic tape.

At this time, the line signal being supplied to the first input terminal IN1 is supplied to the R channel input amplifier and recorded on the R track of the magnetic tape.

That is, the output signal of the microphone and the line signal are simultaneously recorded on the L-R rack of the magnetic tape.

In addition, 1. Each switch S1. S
2. S3. To open/close or switch S4, for example, each switch S1. Using a relay for S2゜S3tS4, the first. A block for signal input to the second jack terminals INA and INB? Each switch S1. S2. S3. 7X first .S4 that can be configured to control the S4. When signals are supplied to the second jack terminals INA and INB using plugs and jacks, a simple configuration as shown in FIG. 2 can be used.

That is, as shown in FIG. 2, the first jack terminal IN
A first jack terminal INA and a first jack terminal INA are inserted into the jack JA into which a plug for supplying a signal to A is inserted. second switch S
1° S2 is integrated into the jack JB into which a plug for supplying a signal to the second jack terminal INB is inserted, and the second jack terminal INB and the third . Fourth switch S3
Incorporate tS4 into one piece.

Then, when the plug is inserted, the contact pieces yl and 2□ of the jacks JA and JB are pushed outward and in contact with the tips of the inserted plugs (connected to the first and second jack terminals NA and INB, respectively). ) are connected to insulating actuating members hl and h2 connected to the first and second switches SL.
yS2 movable contacts co, d.

and 3rd. The movable contact e of the fourth switch S3tS4.

+fO are respectively locked. Note that the explanation of the operation will be omitted.

As is clear from the description of the embodiments described above, according to the present invention, each input terminal IN1 . ■Stereo line signal supplied to N2 to each output terminal 0UT1,0
Operating status output from UT2 and each jack terminal ■NA
, ■Stereo input signal supplied to NB to each output terminal 0
An operating state in which the monaural input signal supplied from one jack terminal INAK is output from each output terminal 0UTI and 0UT2, or a line signal supplied to one input terminal IN1 is output from one output terminal. It is possible to switch between the operating state in which the monaural input signal is output from the terminal 0UT1 and also supplied to the other jack terminal 1NB, and is output from the other output terminal 0UT2, making it an optimal signal distribution circuit for the input circuit of a stereo tape recorder, etc. realizable.

It should be noted that the signal distribution circuit of the present invention can be appropriately applied to applications other than input circuits such as stereo tape recorders, etc., to achieve the desired effect, and each switch is not limited to a mechanical switch.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing the basic configuration of the extra distribution circuit according to the present invention, Fig. 2 is a circuit diagram showing a specific configuration example of the signal distribution circuit according to the present invention, and Fig. 3 is a circuit diagram showing a conventional signal distribution circuit. It is a circuit diagram of a circuit. Sl, S2. S3. S4...Switch, ■NA
. ■NB...Jack terminal, INl, ■N2...
...Input terminal, 0UTI, 0UT2...Output terminal.

Claims (1)

[Claims for Utility Model Registration] The first and second jack terminals INA, NB, and the first
and second input terminals IN1 and IN2, and a first output terminal 0UT1 connected to the jack terminal ■NA via a signal transmission path that is conductive when the first jack terminal INA is plugged in; Said second jack terminal I
A second output terminal 0UT2 is connected to the jack terminal INB via a signal transmission path that is conductive when the plug is inserted into the NB, and the plug is connected to the first jack terminal INA when the plug is inserted into the first jack terminal INA. In the inserted state, the first
The respective terminals IN1 to UT1 are connected via a switch circuit S2 that makes the signal transmission path between the input terminal IN and the first output terminal OUT non-conductive, and the respective jack terminals INA are connected to each other. A switch circuit S 1 y S 4 that is linked to the insertion of the plug into IN8 and brings into conduction the signal transmission path between the second input terminal IN2 and the second output terminal 0UT2 when the plug is not inserted. Each terminal above through "2s
Connect between OUT 2 and the above second jack terminal ■N
In conjunction with the insertion of the plug into B, when the plug is inserted, the above first jack terminal ■NA and the second output terminal 0UT2
A switch circuit S that makes the signal transmission path between the
A signal distribution circuit formed by connecting each of the terminals INA and 0UT2 through the terminals INA and 0UT2.