JP2004356770

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DESCRIPTION JP2004356770
The present invention provides an analog voice monitoring apparatus and method that realize
flexible operation by making connection relations between input / output ports and mix ratio
variable by external computer control or the like. An audio signal input for each channel from an
input side is controlled from the outside to each channel of a signal bus 3 to which a material is
input, as a changing means for changing the signal level for each desired channel. It comprises a
variable part 4 provided with a variable resistor (element) 40 which is a possible signal level
adjuster. A router unit 5 and each adder 6 are provided as addition means for selecting and
adding the voice signals of each channel passed through the variable resistor 40 in a desired
combination and outputting them to the output side. [Selected figure] Figure 1
Analog voice monitoring apparatus and method
The present invention relates to an analog voice monitor apparatus and method for realizing
flexible operation by making connection relations between input / output ports and mix ratio
variable by external computer control or the like. It is a thing. 2. Description of the Related Art In
recent years, with the advancement of digital technology and audio and video technologies and
content in the background, digital and audio technology has been enhanced with four channels
and 5.1 channels in addition to traditional monaural and two-channel stereo. There is an increase
in the types of sound source materials (also referred to as sources) such as surround sound. In
response to this, an audio monitor used at a content production site including audio requires an
operation of reducing the number of channels of an input source and outputting it, and such
operation is called downmix (DownMix) ( See, for example, Patent Document 1). An example of
downmixing is not to output 5.1-channel or 4-channel sources as 2-channel stereo. Although the
actual playback environment of content may differ from user to user, such downmixing allows
multi-channel sources such as 5.1 channel surround stereo to be used in various playback
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environments, such as multi-channels. You can monitor how it sounds when played on a system,
a mono or two channel stereo system, a surround system without a center speaker, and a system
with a center speaker but without a surround speaker. This makes it easy to set acoustic
characteristics such as the level ratio for each channel in order to achieve the adaptation that
exhibits the highest value in the largest number of system configurations. As an example, the
discrete 5.1 channel surround is composed of a full range of 5 main channels (L / C / R / Ls / Rs)
and a subwoofer (SW) for a deep bass effect (LFE). Of these, the main 5 channels should be set to
have uniform sound quality and level, and the main channel and the LFE channel should be set to
an appropriate level ratio. These can be said to be common frameworks even for different multichannel audio formats such as Dolby Digital, DTS, DVD-Audio (LPCM or MLP Lossless), and
MPEG2 AAC (registered trademark), respectively. [0006] The conventional analog audio
monitoring apparatus for performing the downmix as described above has dedicated input and
output ports corresponding to each type of sound source, and the corresponding channels on the
input and output sides. In addition, the pre-fixed wire connection and fixed resistance were
applied.
That is, in such a prior art, as illustrated in FIG. 3, first of all, in the case of having a plurality of
input ports 11, the channel application is made in advance like Lch (left channel) for each
individual input port. It was decided. For example, in an apparatus for inputting and selecting a
multi-channel surround signal and a stereo signal, a set of channels as many as necessary for
each mode is separately made independent of each other as a port matched beforehand with the
mode of input material, that is, type. It was necessary to make the design provided, or if not, it
was necessary to make part of the channels of the surround port also serve as a stereo material
input. Further, the mix ratio is not determined by the user, but is determined at the time of
manufacture of the device, and is realized by changing the level of the audio signal of each
channel by using the fixed resistance according to it. The circuit as described above is called a
downmix circuit or the like, and one example of the surround signal downmix circuit is, as
exemplified in FIG. 3, a resistor 14, a switch 15 such as a relay, an adder 16, etc. It is configured
using an adder circuit. At this time, the downmix ratio for each channel of the surround signal is
determined by the mix resistance ratio realized by the used resistors, and the downmixer
matched to the surround mode of the input signal is performed by turning on / off the switch. It
was When dealing with a plurality of surround modes, the mix ratio is realized by preparing a
resistor and a switch for each required mode. As a more specific example, by turning on the input
port changeover switch provided in the input port of each mode, it is determined which mode is
to be selected, and the input port changeover switch is selected. On the other hand, an output
port changeover switch that switches an output port may be interlocked by a relay in a fixed
correspondence relationship. In such prior art, for example, when down-mixing 5.1 channel
surround to 2-channel stereo and outputting, L (main left), C (center) as illustrated in the wiring
diagram of FIG. The outputs of LFE (subwoofer for bass) and SL (left of surround) may be mixed
into Lt and output from the left channel of stereo. Also, conventionally, in downmix in such a
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case, the mix ratio is determined by passing a predetermined fixed resistance as described above
for each channel, but such resistance is called a mix resistance. It was.
In such prior art, the mix ratio (for example, the ratio of L, C, S) that differs depending on the
type of source is determined in advance for each type of source, and the fixed resistance is
adjusted according to the ratio. Was provided on the line of the output port. In the example of
FIG. 3, there is a line without fixed resistance in L and R of the signal bus, and this is a mix ratio
relative to the attenuation by the fixed resistance of the other line to be added However, fixed
resistances may be provided for all the lines. For example, when outputting L and R as Lt and Rt
as in stereo ST, fixed resistance may not be necessary, but in the case of surround, for example, L
and R inputs may be attenuated by the fixed resistance. It will be common to mix with other L, R
components and output to Lt, Rt. However, such details depend on the mix ratio, and even if you
do not necessarily insert fixed resistances in L and R, set a fixed resistance value on the mix
target side with them to obtain a predetermined mix ratio In this case, only the line without fixed
resistance may be pulled out from the bus. However, in the prior art as described above, since the
connection relationship between the input and output ports and the resistance value are fixed,
There were problems such as the difficulty of flexible operation and the complication of the
mechanism. That is, in the prior art as described above, in which the connection relationship
between input and output ports and the resistance value are previously fixed, it is assumed in
advance how each mode will be monitored, and each output port In addition to preparing the
channel wiring in advance, it is necessary to set the fixed resistance in accordance with the
resistance value of each wiring part as to how to extract the wiring from each line of the bus for
each such wiring. there were. In addition, when the connection relationship between input and
output ports and the resistance value are fixed as such, it is possible to cope with a source having
a different input mode such as a new standard surround without changing the design. There was
also an inconvenience that could not be done. In other words, when different surround modes are
handled simultaneously by the same device, it is necessary to pre-limit the types of input
surround, or to prepare in advance input ports and mix circuits for the expected types. There is a
problem that the circuit scale and the entire device become large. In particular, providing a
dedicated wiring or fixed resistance in accordance with a plurality of modes as described above
complicates the device configuration such as the wiring, increases the cost, reduces the
reliability, and makes maintenance difficult. There was also a problem that brought
disadvantages such as
The present invention solves the problems of the prior art as described above, and its object is to
make the connection relationship between the input and output ports and the mix ratio flexible
by externally controlling the computer etc. It is an object of the present invention to provide an
analog voice monitoring apparatus and method for realizing operation. SUMMARY OF THE
INVENTION In order to achieve the above object, an analog audio monitoring apparatus
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according to claim 1 changes the level of an audio signal input for each channel from the input
side for each desired channel. Changing means for causing the change, adding means for
selecting and adding the audio signal of each channel through the changing means in a desired
combination, and outputting the selected signal to the output side, and for each channel in the
changing means A control means is provided for controlling the contents of level change and the
combination in the addition means. According to a fourth aspect of the present invention, there is
provided an analog audio monitoring method, in which the invention of the first aspect is
captured from the viewpoint of the method, a change in level of an audio signal input for each
channel from the input side for each desired channel. According to the process, the addition
process of selecting and adding the audio signal of each channel which has passed through the
change process in a desired combination and outputting it to the output side, and the change
contents of the level for each channel in the change process And a control process for controlling
the combination in the addition process. [0020] The invention of claim 2 is the analog voice
monitoring apparatus according to claim 1, wherein the changing means is provided for each
channel of a signal bus connected to one or more input ports. An electronic variable resistor is
provided, and the control means is configured to control each variable resistor in accordance
with a predetermined value corresponding to the input instruction. Do. According to the
invention of claim 3, in the analog voice monitor apparatus according to claim 1 or 2, the
addition means is connected to each channel of a signal bus connected to one or more input
ports and an output port. A router means which forms a physical or logical matrix by physical or
electronic contacts with each of the channels, the control means is configured to connect the
contacts of the router means to the input instructions It is characterized in that it is configured to
be turned on and off according to a corresponding and predetermined combination.
In the present invention, flexible operation can be realized by making the connection relationship
between the input and output ports and the mix ratio variable by external computer control or
the like. That is, by controlling the attenuation value applied to each channel from the input side
as the change content of the level, it is possible to cope with any of a plurality of audio modes
including the surround format of the new standard that will appear in the future. Also, by freely
controlling which combination of each channel is added and output to each channel on the
output side, it is possible to control the same output port in multiple voice modes regardless of
the number of input ports and selection switching. Ports can also be used freely, such as sharing
in DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of an
analog voice monitoring apparatus (hereinafter referred to as this apparatus ) and a method
according to the present invention (hereinafter referred to as this embodiment ) will be
described with reference to the drawings. This will be described specifically. In addition, about
the member same as the prior art shown in FIG. 3, it represents with the same code ¦ symbol and
abbreviate ¦ omits description. 【0024】 〔1. Configuration] As shown in the configuration
diagram of FIG. 1, this device is an analog voice monitor device that connects the input port 1 for
each mode provided on the input side and the output port 2 on the output side with a signal bus
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3. This device can be externally controlled on each channel of the signal bus to which material is
input, as a changing means for changing the signal level for each desired channel for the audio
signal input for each channel from the input side A variable portion 4 provided with a variable
resistor (element) 40 which is a signal level adjuster. That is, the changing unit 4 is a set of
electrical or electronic variable resistors 40 provided for each channel of the signal bus 3
connected to each input port 1. In addition to the variable resistors shown in FIG. 1, desired
element technologies such as VCA (Voltage Controlled Amplifier) and DA converter may be
selected as the level changing means for each channel. The present apparatus also includes a
router unit 5 and each adder 6 as addition means for selecting and adding the audio signals of
each channel passed through the variable resistor 40 in a desired combination and outputting
them to the output side. Here, the router unit 5 is physically switched by physical or electronic
on / off switches, that is, contacts 50 of each channel of the signal bus 3 connected to each input
port 1 and each channel toward the output port 2. Form a logical or logical input / output matrix,
and for each channel going to output port 2, each line from a contact that may be mixed to that
channel is concentrated to each summer 6 of that channel .
Further, according to an instruction input from the operation unit 7 such as a push button, the
present apparatus changes the level of each channel in the change unit 4 and the combination of
the router unit 5 and each adder 6. , And a controller 8 for controlling. The control unit 8 turns
on / off each contact 50 of the router unit 5 according to a combination determined in advance
corresponding to the instruction input from the operation unit 7 by the action of a built-in
program or control data (not shown). Each variable resistor 40 is configured to be controlled in
accordance with a predetermined value corresponding to the instruction input from the
operation unit 7. 【0028】 〔2. Operation and Effects] In the present embodiment
configured as described above, flexible operation can be realized by making the connection
relationship between the input and output ports and the mix ratio variable by external computer
control or the like. That is, there are various types of audio material in the analog signal to be
monitored, such as stereo and various surround modes, but when monitoring, the attenuation
value to be applied to each channel from the input side is variable resistors 40 etc. The input
level of each channel can be freely determined by changing by the changing means and
controlling the contents of the change. In addition, a combination of each level-adjusted channel
in such a combination and output to each channel on the output side can be freely selected by
the matrix-like router unit 5 and will appear in the future. It can support any of a number of
different audio modes, including the new standard surround format. In particular, these controls
are performed by a control device such as a CPU in the control unit 8, and the program and
control data can be corrected to easily cope with the downmix related to any surround mode.
Here, a processing procedure of downmixing realized by such a control device in the control unit
8 is shown in FIG. That is, in this procedure, when the operator selects the input material and the
output mode with the switch of the operation unit 7 or the like (step 1), the switch or relay of the
selected input port based on the command from such switch Is turned on (step 2), and according
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to the output mode (steps 3, 7 and 11), the necessary downmix level is set (steps 4, 5, 8, 9, 12,
13) and plays the role of output router The router unit 4 is set to the corresponding mode (steps
6, 10, 14, 16).
When the monaural signal is output as it is or when the output mode is 5.1ch surround, the
downmix setting in steps 4 and 5 is unnecessary. Also, in the example of FIG. 2, monaural (steps
3 to 3), stereo (steps 7 to 7), 4ch surround (steps 11 to), and 5.1ch surround (step 15 to) are
shown. The same process may be repeated to handle it. Further, by using the router unit 5 based
on the input / output matrix, even if there are a plurality of input ports and output ports to be
used, they can be selected independently from each other independently, or the same output port
Ports can also be used in a free manner, such as sharing multiple voice modes. For example, the
SL and SR input ports in 5.1ch surround input can be treated as mere L and R channel input
ports of stereo material. Of course, since the output can be taken out from any wiring of the
signal bus to any output terminal, there is no need to prepare plural kinds of output ports
according to the output form of the monitor, and the wiring is simplified. Further, the wiring of
the output port is not limited by the resistance value, and an appropriate mix ratio can be
obtained by connecting any input to any output wiring. 【0034】 〔3. Other
Embodiments] The present invention is not limited to the above embodiment, but includes other
embodiments as exemplified below. For example, when the output mode is stereo, level
attenuation in the downmix may be omitted, and the L or R of the source may be output as it is.
Further, the number of terminals of the signal bus and the input port can be increased according
to the number of channels. For example, when eight channels are used depending on the type of
VTR, each element such as an input / output port, a signal bus, a matrix, etc. may be expanded so
that the number of channels corresponding thereto can be handled on at least one of the input
side or output side. . As described above, according to the present invention, analog voice
realizing flexible operation by varying the connection relationship between input and output
ports and the mix ratio by external computer control or the like. A monitoring device and method
can be provided. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the
configuration of an embodiment of an analog voice monitor apparatus according to the present
invention. FIG. 2 is a flowchart showing a processing procedure of control in the embodiment of
the present invention.
FIG. 3 is a block diagram showing an example of an analog voice monitor apparatus according to
the prior art. Explanation of symbols 1 ... input port 2 ... output port 3 ... signal bus 4 ... change
section 40 ... variable resistor 5 ... router section 50 ... contact point 6 ... adder 7 ... operation
section 8 ... control section
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