JPH0652226U - Signal switching circuit - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a signal switching circuit used in an audio mixer, and an object thereof is to facilitate the operation and reduce the cost of the device. [Composition] When an effect send signal is taken out from a front stage or a rear stage of a channel fader 24, an output unit 22
In addition, a pre / post switch 30 for selecting the extraction of the effect send signal from the front stage or the rear stage in the input section 21 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a signal switching circuit used in an audio mixer.

[0002]

[Prior art]

 Conventionally, a circuit for extracting an effect send signal has been added to an audio mixer, and the effect send signal is used to add an effect to the output signal and perform monitoring, etc. Figure 3 shows the effect send circuit of a conventional mixer. The circuit diagram of is shown. Generally, the effect send signal sent from each channel of the mixer is taken out from the latter stage (post) of the channel fader, but depending on the usage situation, you may want to take it out from the front stage (pre). The mixer is equipped with a switch that switches between pre / post.

In FIG. 3, the volume of an input signal is adjusted by a channel fader 11, amplified by a buffer amplifier 12, and then input to a pan pot (panoramic potentiometer) 13, and at the same time a pre / post switch 14 is operated. It is input to the post side. Further, the input signal is input to the pre (PRE) side of the pre / post switch 14.

The pan pot 13 sets the stereo localization of L and R, and its output is sent to each of the L channel bus and the R channel bus.

On the other hand, the effect send signal taken out from the common side of the pre / post switch 14 is adjusted in volume by the variable resistor 15 and sent to the effect send bus B ₁ .

A plurality of sets of these circuits are connected to the L channel bus, the R channel bus, and the effect send bus B ₁ for each input channel.

In the output stage (master section), the L channel signal is sent from the L channel bus to the L channel line via the summing amplifier 16, and the R channel signal is sent from the R channel bus via the summing amplifier 17 to the R channel signal. Is sent to the R channel line. Then, the effect send signal is sent from the effect send bus B ₁ through the summing amplifier 18 to the effect send line E ₁ connected to a predetermined effector (e.g. echo) or monitor speaker.

In the circuit as described above, when the pre / post switch 14 is on the post side, an effect send signal is sent to an effector such as an echo, and when it is on the pre side, monitoring is performed.

[0009]

[Problems to be solved by the device]

 By the way, the pre / post switch 14 provided in each input channel is rarely different on each channel, such as on the pre side or the post side, and it is preferable that all the channels are on the pre side or the post side. It is common. Therefore, in order to set the effect send signals of the multi-channel mixer of several tens of channels (for example, 24 channels, 32 channels) to the pre side or the post side all at once, all the pre / post switches 14 must be switched. However, there is a problem that it is complicated. In addition, if these are switched all at once by a relay or the like, there is a problem that it becomes expensive.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a signal switching circuit for facilitating the operation and reducing the cost of the device.

[0011]

[Means for Solving the Problems]

 The above-mentioned problem is that the stereo localization is set after the signal amount of the input signal is adjusted by the adjusting means, and the effect send signal of another system is taken out from either the front stage or the rear stage of the adjusting means. A signal switching circuit comprising a number of input sections and an output section for outputting the stereo-localized stereo signal and the effect send signal to a predetermined channel line, wherein the output section has the input section This is solved by providing a switch means for selecting the extraction of the effect send signal from the front stage or the rear stage of the adjusting means.

[0012]

[Action]

 As described above, when the effect send signal is taken out from the front stage or the rear stage of the adjusting means, it is switched and output by the switch means provided in the output section. That is, by providing the switch means at the output portion, even if a plurality of input portions are connected, the effect send signal can be taken out from the front stage or the rear stage of the adjusting means by a single switching.

Thus, the operation can be facilitated and the cost of the device can be reduced.

[0014]

【Example】

 FIG. 1 shows a block diagram of a first embodiment of the present invention. FIG. 1 shows a signal switching circuit used in an audio mixer.

The signal switching circuit 20 in FIG. 1 is roughly divided into an input section 21 and an output section 22 with an L channel bus, an R channel bus, and effect send buses B ₁ and B ₂ as boundaries.

The input section 21 is connected to the input terminal of the pan pot 26 of the stereo localization circuit via the channel fader 24 and the buffer amplifier 25 from the input terminal 23 connected to the equalizer circuit in the preceding stage. The two output terminals of the pan pot 26 are connected to the L channel bus and the R channel bus, respectively.

The output terminal of the buffer amplifier 25 is connected to the effect send bus B ₁ via the variable resistor 27a, and the input terminal 23 is connected to the effect send bus B ₂ via the variable resistor 27b. The two variable resistors 27a and 27b are two variable resistors that are interlocked with each other.

A plurality of sets of the above circuits are connected to the L channel bus, the R channel bus, and the effect cent buses B ₁ and B ₂ .

On the other hand, the output unit 22 is connected from the L channel bus to the L channel line via the summing amplifier 28, and from the R channel bus to the R channel line via the summing amplifier 29.

Further, the effect send bus B ₁ is connected to the post (POST) terminal of the pre / post switch 30 which is a switch means, and the effect send bus B ₂ is connected to the pre (PRE) terminal. The common terminal of the pre / post switch 30 is connected to the effect send line E ₁ connected to a predetermined effector via the summing amplifier 31.

In such a signal switching circuit 20, first, in the input section 21, the volume of the input signal input to the input terminal 23 is adjusted by the channel fader 24, the volume is amplified by the buffer amplifier 25, and then the pan pot 26. Stereo localization is adjusted by and becomes a stereo signal, which is sent to the L and R channel buses.

On the other hand, the post signal of the effect send signal extracted from the subsequent stage of the channel fader 24 (output of the buffer amplifier 25) is adjusted in volume by the variable resistor 27a and sent to the effect send bus B ₁ . Also, pre-signal effect send signal taken from the preceding channel fader 24 (input terminal 23) is sent is the volume adjusted to effect send bus B ₂ the variable resistor 27b.

In the output section 22, the L channel bus signal is mixed by the summing amplifier 28 to obtain a stereo L channel signal, and the R channel bus signal is mixed by the summing amplifier 29 to obtain a stereo R channel signal. To be

Further, the post signal and the pre signal of the effect send signals in the effect send buses B ₁ and B ₂ are switched by the pre / post switch 30, mixed by the summing amplifier 31 and sent to a predetermined effector. For example, with the switch 30 on the pre-terminal side, the input signal input to each channel can be monitored with one switching.

As described above, since the pre / post switch 30 is not provided for each channel but is collectively switched by the output unit 22, even a mixer having several tens of channels can be easily operated and the parts can be easily operated. The number of points can be reduced and the cost of the device can be reduced.

Next, FIG. 2 shows a block diagram of a second embodiment of the present invention. The signal switching circuit 20 of FIG. 2 is for outputting an effect send signal in stereo, and has effect send buses B ₃ and B ₄ added to the circuit of FIG. That is, the effect send buses B ₁ and B ₃ are post signal buses, and the buses B ₂ and B ₄ are pre signal buses.

In this case, two effect send pan pots 32 and 33 are respectively provided at the subsequent stages of the variable resistors 27 a and 27 b, and the effect send bus B is provided from the pot 32.₁, B₃Send a post signal to the effect send bus B from pot 33. ₂ , B_FourSend a pre signal to.

The pre / post switch 30a switches the post signal or the pre signal from the effect send buses B ₁ and B ₂ , and mixes them by the summing amplifier 31a and outputs them. Then, a pre / post switch 30b (two series of pre / post switches) interlocking with the pre / post switch 30a switches the post signal or the pre signal from the effect send buses B ₃ and B ₄ , and mixes them by the summing amplifier 31b. Output.

That is, a stereo effect send signal is sent out between the effect send lines E ₁ and E ₂ , and the stereo localization of the post signal or the pre signal is set by the effect send pan pots 32 and 33. Is.

As described above, even in the case of stereo output, by switching the post signal and the pre signal with the two pre / post switches, the operation can be facilitated and the cost of the device can be reduced. Is.

[0031]

[Effect of device]

 As described above, according to the present invention, the effect send signal is monaural or stereo output by switching the effect send signal by the switch means provided in the output section and extracting it from the front stage or the rear stage of the adjusting means. However, the cost of the device can be reduced by facilitating the operation and reducing the number of parts.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a second embodiment of the present invention.

FIG. 3 is a circuit diagram of an effect send circuit of a conventional mixer.

[Explanation of symbols]

 20 signal switching circuit 21 input section 22 output section 23 input terminal 24 channel fader 25 buffer amplifier 26 pan pot 27a, 27b variable resistor 28, 29, 31, 31a, 31b summing amplifier 30, 30a, 30b pre / post switch 32, 33 Effect Send Pan Pot

Claims (1)

[Scope of utility model registration request] 1. The stereo localization is set after the signal amount of the input signal is adjusted by the adjusting means, and the effect of another system is set from either the front stage or the rear stage of the adjusting means.
A signal switching circuit comprising a predetermined number of input sections from which a send signal is taken out and an output section for outputting the stereo-localized stereo signal and the effect send signal to a predetermined channel line, wherein the output section has the input A signal switching circuit having a switch means for selecting whether to take out the effect send signal from the front stage or the rear stage of the adjusting means.