JP4071539B2 - Audio signal switching device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an audio signal switching device that selectively adds a plurality of input systems of audio signals and outputs them as a plurality of output systems.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an audio signal switching device, a plurality of input systems (input channels) of audio signals corresponding to a plurality of voices having different purposes and contents (for example, announcements such as real voices and contents such as music) are selected by a predetermined selection method. A plurality of output systems (output channels) are selected and added. The selection method of the output system to be added has been conventionally realized by various circuit methods.
[0003]
FIG. 3 is a circuit diagram showing a circuit configuration of a conventional audio signal switching device. The audio signal switching device shown in FIG. 3 forms a full assign mixer, and can add audio signals of all input systems to all output systems. Therefore, it is possible to meet any system requirements relating to audio signal mixing processing.
[0004]
Specifically, in FIG. 3, on the BUS 91, the audio signals of these input systems are operated by the operation of the switch groups interposed between the input systems (inputs 911, 912, 913, 914) and the BUS 91, 92, 93. Are arbitrarily selected and added to be taken out as an output 921 (output system). Similarly, on the BUS 92, the audio signals of the above-described input system are arbitrarily selected and added, and are extracted as an output 922 (output system). Further, also on the BUS 93, the above-mentioned audio signals of the input system are arbitrarily selected and added, and are extracted as an output 923 (output system).
[0005]
FIG. 4 is a circuit diagram showing a conventional audio signal switching device. The audio signal switching device shown in FIG. 4 constitutes a system-fixed mixer and is used as a mixer limited in application. In this system fixed mixer, the audio signal of the input system is selected and added in a fixed manner. Therefore, it cannot meet various system requirements such as the above-mentioned full assign mixer. However, the fixed system does not require an operation of selecting a switch, and has an advantage that the system configuration can be easily performed.
[0006]
Specifically, in FIG. 4, on the BUS 91, only the inputs 911, 913, and 914 (the input 912 is cut) are always selected and added, and are taken out as an output 931. On the BUS 92, only the input 912 is always selected and added, and is taken out as an output 932. Further, on the BUS 93, the inputs 911, 912, 913, and 914 (all input systems) are always selected, added, and taken out as an output 933.
[0007]
FIG. 5 is a circuit diagram showing a conventional audio signal switching device. The audio signal switching device shown in FIG. 5 has the same wiring as the audio signal switching device constituting the full assign mixer shown in FIG. 3, but each input system (inputs 911, 912, 913, 914) and BUS 91, 92, 93 is different in that the switch pattern (a combination of ON / OFF states) of the switch group interposed between the switch 93 is controlled via the CPU 952 so as to be a switch pattern selected from those stored in the pattern selector 951. ing.
[0008]
The audio signal switching device shown in FIG. 5 is such that the above-described switch group in the audio signal switching device constituting the full assign mixer shown in FIG. 3 can be controlled by the CPU 952, and the switch pattern of this switch group is actually used. Are controlled so as to have several switch patterns corresponding to.
[0009]
[Problems to be solved by the invention]
However, the above-described conventional audio signal switching device has the following problems either in terms of component cost or convenience in use.
[0010]
In the case of the audio signal switching device constituting the full assign mixer shown in FIG. 3, only the contact (specifically, 12 switches) is required as a result (product) obtained by multiplying the number of input systems and the number of output systems. Thus, there is a problem in terms of cost. In addition, although the degree of freedom in system configuration is high, it is necessary to set all the switches by the user's operation and form the system desired by the user, so that the operability is poor and system setting errors are likely to occur. There's a problem.
[0011]
In the case of the audio signal switching device constituting the system fixed mixer shown in FIG. 4, since the distribution of the audio signal from the input system to the output system is fixed, the system desired by the user cannot be formed by the user, There are problems such as lack of convenience and system flexibility.
[0012]
In the case of an audio signal switching device with a pattern selector shown in FIG. 5, when a system desired by a user is formed, there is a convenience that a patterned system configuration can be used, which is excellent in operability and system setting. Although there is an advantage that an error is hardly generated, on the other hand, since the pattern selector 951 and the CPU 952 are required, there is a problem that the cost is more disadvantageous than the audio signal switching device shown in FIG.
[0013]
The present invention has been made in view of the above-described circumstances, and provides a low-cost audio signal switching device that can switch the distribution of audio signals from an input system to an output system with a simple operation. It is an object.
[0014]
[Means for Solving the Problems]
In order to achieve the above-described object, an audio signal adding device according to the present invention is an audio signal switching device that selectively adds a plurality of input audio signals and outputs them from a plurality of channels. A first output system for adding and outputting the audio signal of the first input system fixedly selected and the audio signal of the input system dynamically selected based on the first predetermined selection pattern ; The audio signal of the second input system that is fixedly selected from all the predetermined input systems and the audio signal of the input system that is dynamically selected based on the second predetermined selection pattern are added. a second output system for outputting Te, of prior SL all predetermined input system, a third output line for outputting by adding the audio signal of the input channel to be dynamically selected by the manual operation, the first 1 and a second predetermined selection pattern A pattern switching circuit control for, characterized by comprising a.
[0015]
This saves the total number of switches used compared to the conventional audio signal switching device, enables the formation of a system for other purposes, and is preset instead of using an expensive CPU and pattern selector. A low cost audio signal switching device is realized by controlling a switch group based on a predetermined selection pattern.
[0016]
In addition, there is provided means for adding, to the first to third output systems, audio signals of the input system that are dynamically selected from the additionally set audio signals of the input system. It is characterized by. As a result, an audio signal switching device that can respond to the formation of a more versatile system is realized.
[0017]
In addition, a pattern switch for providing the first and second predetermined selection patterns is provided. This realizes an audio signal switching device that improves operational convenience and is unlikely to cause system misconfiguration.
[0018]
Further, the present invention is characterized in that a premixing mechanism is provided that adds a sound signal of an input system selected based on the first or second predetermined selection pattern by a mixing amplifier . As a result, the number of switches, which are necessary parts, can be further saved, and an audio signal switching device with lower cost can be realized.
[0019]
In addition, a switch for selecting an output to the first or second output system based on an instruction from the pattern switch circuit is provided. Thereby, the convenience of the operativity at the time of adding a pre-mixing mechanism can be improved.
[0020]
The pattern switch circuit operates according to an instruction from an external circuit. This realizes an audio signal switching device that improves operational convenience and enables timing control of system formation.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
The audio signal switching device of the present invention will be described below with reference to the drawings.
FIG. 1 is a circuit diagram showing an audio signal switching device according to an embodiment of the present invention. The audio signal switching device shown in FIG. 1 includes BUS1, BUS2, and BUS3 that form a base wiring for adding audio signals, and a switch SW1 that supplies an input 11 supplied to BUS1 to BUS2, as well as an input 11 Switch SW11 for supplying BUS3, switch SW2 for supplying input 12 supplied to BUS2 to BUS1, switch SW12 for supplying input 12 to BUS3, and input 13 for BUS1. A switch SW31 for supplying the input 13 to the BUS2, a switch SW13 for supplying the input 13 to the BUS3, and a switch for supplying the input 15 to the BUS3. SW15 and switch SW15 for supplying the input 15 to BUS1 as well Similarly, the switch SW152 for supplying the input 15 to the BUS2 and the pattern switch 5 for controlling the ON / OFF state pattern of the switches SW1 to SW3 and for controlling the ON / OFF state pattern of the switches SW31 and SW32. (Pattern switch circuit). In addition, the element relevant to the input 15 (full assign system | strain) can be provided arbitrarily.
[0022]
The function of the audio signal switching device shown in FIG. 1 will be described below. The audio signals of the input 11, the input 12, the input 13, and the input 15 are added on BUS1 (provided that the switches SW151, SW2, and SW3 are ON) and are extracted as the output 21. Also, each audio signal of the input 11, input 12, input 13, input 15 is added on BUS2 (However, when the switch SW1, SW3, SW152 is ON), is taken out as an output 22. Further, the audio signals of the input 11, the input 12, the input 13, and the input 15 are added on the BUS3 (provided that the switches SW11 to SW15 are ON). BUS3 is a bus for performing addition of a full assign system.
[0023]
The input 11 is always supplied to BUS1, but is also supplied to BUS2 when the switch SW1 is ON. Further, when the switch SW11 is ON, it is also supplied to the BUS3 of the full assign system. The input 12 is always supplied to BUS2, but is also supplied to BUS1 when the switch SW2 is ON. Further, when the switch SW12 is ON, it is also supplied to the BUS3 of the full assign system. The input 13 is also supplied to BUS1 when the switch SW31 is ON. Further, when the switch SW3 is ON, it is also supplied to BUS2. Further, when the switch SW13 is ON, it is also supplied to the BUS3 of the full assign system. The input 15 of the full assignment system is supplied to BUS1, BUS2, and BUS3, respectively, when the switches SW151, SW152, and SW15 are ON.
[0024]
From BUS1, BUS2, and BUS3, audio signals of output 21, output 22, and output 23 are extracted, respectively.
[0025]
The pattern switch 5 stores the ON / OFF state pattern of the switches SW1 to SW4, and controls the ON / OFF state of the switches SW1 to SW4 according to this storage. The pattern switch 5 also stores a pattern of the ON / OFF state of the switch SW31, and controls the ON / OFF state of the switch SW31 according to this storage. These controls are also performed based on a control signal from an external circuit.
[0026]
Switch SW11～SW 13, SW 15 full assignment system, and SW151～SW15 2 is manually operated by an operator, the input 11, input 12, input 13 is added to BUS3 select dynamically the input 15 At the same time, the input 15 is added to BUS1 (output 21), BUS2 (output 22), and BUS3 (output 23) (each dynamically selected).
[0027]
The output 21 extracted from the BUS1 is fixedly selected from all the predetermined input systems (in this case, the input 11, the input 12, and the input 13) (that is, directly allocated without intervention of a switch). The audio signals of the input system (here, input 11) and the input system (here, input 12 and input 13) that are dynamically selected according to the state of the switches SW 2 and SW31 are added and output. And corresponds to the first output system of the present invention.
[0028]
Further, the output 22 extracted from the BUS2 is the input system (in this case, the input 12) fixedly selected from all the predetermined input systems and the states of the switches SW1 and SW3 (the first predetermined input system). The audio signal of the input system (here, (input 11, input 13)) that is dynamically selected in the state based on the selection pattern is added and output, and corresponds to the second output system of the present invention.
[0029]
Further, the audio signal on the BUS3 is manually operated by the switches SW11 to SW1 3 and the additional switch SW15 among all the predetermined input systems and the additional input system (here, the input 5). The audio signal of the input system that is dynamically selected is added, and this BUS 3 corresponds to the means constituting the third output system of the present invention.
[0030]
In the conventional audio signal switching device shown in FIGS. 3 and 5, 12 switches are used. However, in the audio signal switching device of the present invention shown in FIG. 1, the number of switches used is 10. A total of two switches are saved.
[0031]
The conventional audio signal switching device shown in FIG. 5 requires a pattern selector 951 having a complicated circuit configuration and an expensive CPU 952, but the audio signal switching device of the present invention shown in FIG. Since only the simple pattern switch 5 is required, the component cost can be reduced.
[0032]
FIG. 2 is a circuit diagram showing another configuration of the switch group used in the audio signal switching device according to the embodiment of the present invention. The systems of switches SW1 and SW3 for determining whether or not to transmit the audio signals of the inputs 11 and 13 to BUS3 in order to add the signals on BUS2 are equivalently substituted by the circuit shown in FIG. be able to.
[0033]
In the circuit shown in FIG. 2, the audio signals of the inputs 11 and 13 are added by a mixing amplifier 42 (premixing mechanism) which is a premix circuit, and supplied to the BUS2 via the switch SW41. The switch SW41 is controlled by the pattern switch 5.
[0034]
Compared to the circuit shown in FIG. 1, the circuit shown in FIG. 2 uses only the switch SW41 as the switches, so that the total number of switches to be used can be further saved.
[0035]
In the audio signal switching device according to the present embodiment, the predetermined input system has four systems of input 11, input 12, input 13, and input 15, and the output system has three systems of output 21, output 22, and output 23. In the present invention, generally, the number of input systems and the number of output systems of the audio signal switching device can be arbitrarily set.
[0036]
As described above, according to this embodiment, it is possible to save the total number of switches used as compared with the conventional audio signal switching device. Furthermore, by using a premix circuit, the total number of switches used can be further saved. In addition, the circuit for pattern control of the switch group is simplified as compared with the conventional audio signal switching device, and it is not necessary to use an expensive CPU. In addition, since the switch group can be pattern-controlled from an external circuit, the operational convenience is improved. Furthermore, it is possible to respond to the formation of a versatile system by arbitrarily adding a full assignment system.
[0037]
【The invention's effect】
As described above, according to the present invention, the total number of switches to be used can be saved as compared with the conventional audio signal switching device, a system for other purposes can be formed, and an expensive CPU and pattern selector can be formed. Instead of use, it is possible to provide a low-cost audio signal switching device by controlling a switch group based on a predetermined pattern using only a simple pattern switch.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an audio signal switching device according to an embodiment of the present invention.
FIG. 2 is a circuit diagram showing another configuration of a switch group used in the audio signal switching device according to the embodiment of the present invention.
FIG. 3 is a circuit diagram showing a conventional audio signal switching device.
FIG. 4 is a circuit diagram showing a conventional audio signal switching device.
FIG. 5 is a circuit diagram showing a conventional audio signal switching device.
[Explanation of symbols]
1-2 BUS
3 BUS (Full assign system)
5 Pattern switches 11 to 1 3 inputs 15 inputs (full assign system)
21-23 Output SW1-SW4 Switch SW3 1 Switch SW11 to SW15 Switch (Full assign system)
SW151 to SW153 switch (Full assign system)

Claims (4)

In the audio signal switching device that selectively adds the input audio signals of a plurality of systems and outputs from the plurality of systems,
Out of all the predetermined input systems, the audio signal of the first input system fixedly selected and the audio signal of the input system dynamically selected based on the first predetermined selection pattern are added and output. A first output system to
Out of all the predetermined input systems , the audio signal of the second input system that is fixedly selected and the audio signal of the input system that is dynamically selected based on the second predetermined selection pattern are added. A second output system for outputting ;
Among previous SL all predetermined input system, a third output line for outputting by adding the audio signal of the input channel to be dynamically selected by manual operation,
A pattern switch circuit for controlling the first and second predetermined selection patterns;
An audio signal switching device comprising: 2. The audio signal switching device according to claim 1, further comprising a premixing mechanism for adding an audio signal of an input system selected based on the first or second predetermined selection pattern by a mixing amplifier . 3. The audio signal switching device according to claim 2, further comprising a switch for selecting an output to the first or second output system based on an instruction from the pattern switch circuit.   4. The audio signal switching device according to claim 1, wherein the pattern switch circuit operates in accordance with an instruction from an external circuit.

Images