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DESCRIPTION JP2016096368

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DESCRIPTION JP2016096368
Abstract: The present invention provides a recording apparatus capable of reliably operating a
microphone and performing backup recording even when power supply from the transmitter to
the microphone is cut off. A recording device (backup recording device) 12 is connected between
a microphone 10 and a transmitter 14. The recording device 12 monitors the operating voltage
supplied from the transmitter 14 to the microphone 10, and supplies the operating voltage to the
microphone 10 in place of the transmitter 14 when the voltage falls below the threshold. In this
case, since the level of the audio signal changes, the gain of the audio signal is adjusted in
conjunction with the operation voltage supply. [Selected figure] Figure 1
Recording device
[0001]
The present invention relates to a recording device, and more particularly to the supply of
operating voltage to a microphone.
[0002]
BACKGROUND Conventionally, a recording apparatus has been developed that copes with
various faults during recording.
[0003]
Patent Document 1 discloses a digital voice recording and reproducing method that achieves a
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1
function that can be played back without losing voice information recorded so far without using
a backup battery even when the battery is exhausted during recording. The device is described.
It is described that when recording is performed on a removable memory which is an external
memory and the power supply voltage becomes lower than a predetermined level, a warning
display is performed to perform recording end processing.
[0004]
Patent Document 2 describes a digital amplifier whose task is to perform continuous voice
output in a state in which voice deterioration is prevented even when the power supply circuit
that supplies power to the digital amplifier is stopped. ing.
When the power supply circuit (DC / DC converter) for supplying power to the digital amplifier is
stopped, the battery power is switched to be directly supplied to the class D driver and pulse
modulator, and the gain of the analog input signal is lowered. It has been described to generate
an operating condition commensurate with the power supply voltage dropped due to the stop of
the DC / DC converter.
[0005]
JP, 2001-5494, A JP, 2006-148671, A
[0006]
By the way, there is known a system in which a speaker wears a lavalier microphone (condenser
microphone) and a transmitter, inputs voice from the lavalier microphone, transmits this to a
remote master recorder by the transmitter, and records a voice signal. It has been proposed that
a backup recording device be interposed between the lavelia microphone and the transmitter in
preparation for transmission errors of the transmitter.
[0007]
In such a system, the Lavelia microphone and transmitter inherently function as a pair, so the
Lavelia microphone's operating power will be supplied from the transmitter, but if the
transmitter's power circuit is shut down or the transmitter's battery is exhausted. Since the power
supply to the lavelia microphone is cut off, the backup recording device can not back up and
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record the audio signal.
[0008]
The present invention has been made in view of the above problems, and the microphone can be
reliably used even when the power supply from the transmitter to the microphone is cut off
(including the case where the voltage drops below the voltage necessary for the microphone to
operate). Provided is a recording device capable of operating and performing backup recording.
[0009]
The present invention is a recording device connected between a microphone and a transmitter,
which is means for outputting an audio signal supplied from the microphone to the transmitter,
and recording means for processing the audio signal and recording it in a memory. Detecting
means for detecting an operating voltage supplied from the transmitter to the microphone; and
voltage supplying means for supplying the operating voltage to the microphone instead of the
transmitter when the detected operating voltage is less than a threshold. It is characterized by
having.
[0010]
In one embodiment of the present invention, further, an adjustment means for adjusting at least
one of a gain and a frequency characteristic of the audio signal supplied from the microphone
when the operating voltage is supplied by the voltage supply means is provided. Prepare.
[0011]
According to the present invention, even if the power supply circuit of the transmitter is stopped
or the battery is exhausted and the operating voltage of the microphone can not be supplied, the
microphone can output an audio signal because the recording device substitutes the operating
voltage. This enables backup recording.
[0012]
Further, according to the present invention, even if the level of the audio signal from the
microphone changes due to the alternative supply of the operating voltage, this can be
compensated to maintain the quality of the backup recording.
[0013]
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It is a system configuration figure of an embodiment.
It is a structure block diagram of the recording device of embodiment.
It is a processing flow chart of an embodiment.
[0014]
Hereinafter, embodiments of the present invention will be described based on the drawings.
[0015]
FIG. 1 is a system configuration diagram using a recording device in the present embodiment.
The recording device 12 functions as a backup recording device and is connected between the
microphone 10 and the transmitter 14.
[0016]
The basic configuration of the system is a microphone 10 and a transmitter 14, and an audio
signal input from the microphone 10 is supplied to the transmitter 14.
The transmitter 14 modulates the audio signal in a predetermined format and transmits it to a
master recorder (not shown) disposed at a remote location.
The master recorder receives and records the audio signal transmitted from the transmitter 14.
[0017]
The microphone 10 and the transmitter 14 are both wearable, and worn by a player or the like to
input and transmit voice.
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[0018]
In such a basic system, when the transmitter 14 has some trouble and transmission of an audio
signal becomes impossible, the audio signal input from the microphone 10 is not recorded in the
master recorder.
In this case, another voice input is required, which causes a burden on the player and the like.
[0019]
Therefore, as shown in FIG. 1, the recording device 12 is interposed between the microphone 10
and the transmitter 14, and an audio signal from the microphone 10 is output to the transmitter
14 and transmitted from the transmitter 14, and the microphone is parallel to this. The audio
signal from 10 is recorded by the recording device 12.
As a result, even if the transmitter 14 has a problem and can not transmit an audio signal, the
audio signal is recorded by the recording device 12 (backup recording), so that the recorded
audio signal is used as necessary. Is possible.
For example, an audio signal of a period not recorded by the master recorder is replaced with an
audio signal backed up and recorded by the recording device 12 or the like.
The voice signal backed up by the recording device 12 can be arbitrarily edited by a voice editor
or the like.
Of course, when the transmitter 14 is operating normally, the audio signal backed up to the
recording device 12 may be erased.
[0020]
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In FIG. 1, an arrow 100 indicates the flow of an audio signal. An audio signal from the
microphone 10 is supplied to the recording device 12 via a cable 16 connecting the microphone
10 and the recording device 12. The recording device 12 outputs the audio signal from the
microphone 10 as it is, and is supplied to the transmitter 14 via the cable 18 connecting the
recording device 12 and the transmitter 14. At the same time, the recording device 12 branches
the audio signal from the microphone 10 and records it in the internal memory.
[0021]
Further, in FIG. 1, dashed dotted arrows 200 and 300 indicate the flow of power supply. In the
case where the microphone 10 is a Lavalia microphone or a condenser microphone, operating
power is required to convert the input voice into a voice signal, and this power is supplied from
the transmitter 14 as indicated by the arrow 200. That is, the microphone 10 and the transmitter
14 are connected by the cables 16 and 18 via the recording device 12, and operating power is
supplied from the transmitter 14 to the microphone 10 via the cables 16 and 18.
[0022]
On the other hand, when the power supply circuit of the transmitter 14 is stopped or the battery
of the transmitter 14 is exhausted, the power supply to the microphone 10 is interrupted, so that
the audio signal can not be supplied from the microphone 10. In this case, not only the audio
signal can not be transmitted from the transmitter 14 but also the recording device 12 can not
record (it becomes silent recording).
[0023]
Therefore, the recording device 12 of the present embodiment constantly monitors the power
supplied from the transmitter 14 to the microphone 10, and the power supplied from the
transmitter 14 to the microphone 10 does not reach the power necessary for the operation of the
microphone 10. In addition, as indicated by the arrow 300, the microphone 10 is maintained by
supplying alternative power to the microphone 10 instead of the transmitter 14.
[0024]
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The power supplied from the recording device 12 to the microphone 10 is the power of a built-in
battery for supplying power to each part of the recording device 12.
Since the power required for the operation of the microphone 10 is relatively small, it hardly
affects the power supplied to each part of the recording device 12.
[0025]
FIG. 2 is a block diagram of the recording device 12. The recording device 12 includes a codec
22, a CPU 24, a RAM 26, a flash ROM 28, an SD card slot 32, a display 36, an infrared
transceiver 40, various switches 42, and a battery 44.
[0026]
The microphone 10 is connected to the input side interface (IN) of the recording device 12 by a
cable 16, and the transmitter 14 is connected to the output side interface (OUT) by a cable 18.
The cables 16 and 18 respectively have a microphone line (MIC) and a microphone bias line
(MICBIAS), and transmit an audio signal in the former and transmit power in the latter.
[0027]
The microphone line (MIC) 20 has the input side interface (IN) connected as it is to the output
side interface (OUT) and is output to the transmitter 14, and a part of the line is branched and
connected to the codec (CODEC) 22. .
[0028]
The codec 22 includes a programmable gain amplifier (PGA) and an A / D, amplifies an audio
signal from the microphone 10 with a given gain, converts it into a digital signal, and supplies
the digital signal to the CPU 24.
Although the gain is usually a fixed value, in the present embodiment, when power is alternately
supplied to the microphone 10, it is dynamically adjusted. This will be further described later.
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[0029]
The CPU 24 processes digital audio signals and records audio data on the SD card inserted in the
SD card slot 32. Since the audio signal from the microphone 10 is output as it is to the
transmitter 14 and recorded on the SD card, the audio signal is transmitted from the transmitter
14 to the master recorder and recorded, and is back-up recorded in the recording device 12
become.
[0030]
The CPU 24 uses the RAM 26 as a working memory in accordance with the program stored in
the flash ROM 28 and performs predetermined recording processing and various processing
(recording audio data on an SD card such as analog / digital conversion of audio signals and
creation of audio data files) Signal processing and information processing for operating the
recording device 12). The CPU 24 operates with a clock signal from an oscillator (clock
generator) 33 connected to the CPU 24. The real time clock (RTC) 34 generates date and time
information on the basis of a clock signal from an oscillator 35 connected to the RTC 34 and
displays it on the display 36 and supplies the date and time information to the CPU 24.
[0031]
The display 36 is, for example, an organic EL display, and displays various statuses of the
recording device 12 according to an instruction from the CPU 24. The various statuses are
recording time, playback time, and the like.
[0032]
The infrared transmitter / receiver 40 is connected to the CPU 24 via the controller 38, and
transmits / receives other recording devices 12 and various setting information (time
information, menu setting information, etc.). In addition, operation signals from various switches
42, such as a power switch, a recording start / stop switch, a menu switch, and a volume switch,
are input, and the CPU 24 controls the operation of the recording device 12 according to these
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operation signals. For example, when the user (user wearing the microphone 10, the recording
device 12 and the transmitter 14) turns on the power and turns on the recording start switch,
recording starts and the recording time is displayed on the display 36. When the stop switch is
operated, the recording is stopped, and the file name being recorded is displayed on the display
36.
[0033]
When connected to a personal computer or the like via the USB connector 30, the CPU 24 reads
out audio data recorded in the SD card and outputs the read audio data to the personal computer
via the USB connector 30. Further, audio data supplied from the personal computer is input
through the USB connector 30 and recorded in the SD card.
[0034]
The battery 44 is a digital input / output in the recording device 12 including the CPU 24 via the
DC / DC converter 46, low dropout voltage regulators (LDOs) 48 to 54, the DC / DC converter 56,
and the LDO 58. A power supply voltage is supplied to the circuit (DIGITAL I / O), display 36
(PWR DISP), analog circuit (ANALOG), SD card (PWR SD), CPU (CPU CORE), and analog audio
circuit (ANALOG AUDIO).
[0035]
On the other hand, the microphone bias line (MICBIAS) 60 connected to the input side interface
(IN) and the output side interface (OUT) is connected to the ADC terminal of the CPU 24.
The CPU 24 monitors the microphone bias voltage supplied to the ADC terminal (A / D converter
terminal), and determines at a predetermined control cycle whether the threshold voltage is
equal to or higher than a threshold. The threshold is a voltage required for the operation of the
microphone 10.
[0036]
Usually, about 5 V is supplied from the transmitter 14 to the microphone bias line 60, and the
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microphone 10 operates by this voltage supply, but when the power supply circuit of the
transmitter 14 is stopped or the battery of the transmitter 14 is exhausted, the microphone The
voltage of the bias line 60 drops and falls below the threshold. When the CPU 24 detects that the
voltage of the microphone bias line 60 falls below the threshold, it assumes that the power
supply of the microphone 10 from the transmitter 14 is cut off, supplies a control signal to the
switch 64, and turns on the switch 64. Do.
[0037]
The switch 64 connects the microphone bias line 60 and the microphone bias power supply
terminal of the codec 22. When the switch 64 is turned on, the codec 22 can be connected to the
microphone bias line 60 to supply power. Become. This power is part of the power supplied from
the battery 44 to the codec 22.
[0038]
Thus, by monitoring the voltage of the microphone bias line 60 by the CPU 24 and supplying
power from the codec 22, that is, from the recording device 12 instead of the transmitter 14,
when the voltage of the microphone bias line 60 falls below the threshold. The microphone 10
can be operated continuously, the power from the transmitter 14 is cut off and the voice signal
can be backed up and recorded while preventing a situation where the voice signal can not be
output (in this case, the transmitter 14). It is assumed that transmission from
[0039]
Here, when the recording device 12 supplies operating power to the microphone 10 instead of
the transmitter 14, it is desirable that the supply voltage from the recording device 12 be equal
to the voltage previously supplied from the transmitter 14, but at least The voltage may be lower
than the voltage supplied from the transmitter 14 as long as it is higher than the operating
voltage of the microphone 10.
In particular, the recording device 12 is operated by the battery 44, and when the battery 44 is
one dry battery etc. (the recording device 12 is required to be particularly compact and
lightweight since it is attached together with the microphone 10 and the transmitter 14)
Therefore, the battery 44 is also required to be small in size and light in weight, and in many
cases it can not but be reduced in capacity. For example, while the supply voltage of the
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transmitter 14 is 5V, the supply voltage of the recording device 12 is 2V, and so on.
[0040]
In addition, since the power supply circuit is stopped or the transmitter 14 whose battery is
exhausted is connected as it is, the load condition of the microphone line 20 may change.
[0041]
As described above, even if the microphone 10 operates as it is and outputs an audio signal, the
level of the audio signal changes due to the drop in the supply voltage from the recording device
12 and the change in the load on the microphone line 20. Changes in signal level have a
significant impact on the quality of backup recording in the recording device 12.
[0042]
Therefore, when the CPU 24 monitors the microphone bias line 60 and the voltage thereof
becomes less than the threshold and supplies alternative power from the codec 22, it
simultaneously adjusts the gain of PGA in the codec 22 and supplies it from the microphone 10.
Compensate for level changes in the audio signal.
Usually, since the level of the audio signal decreases with the substitution of power, the CPU 24
controls the gain of the PGA of the codec 22 to increase to compensate for the reduction of the
audio signal level.
Although the audio signal level may increase, in this case, the PGA gain is controlled to decrease
to compensate. That is, when the voltage supplied from the transmitter 14 is less than the
threshold, the CPU 24 controls the switch 64 from OFF to ON and instructs the PGA of the codec
22 to increase or decrease the gain.
[0043]
FIG. 3 is a process flowchart of the present embodiment. In order to monitor the power supply
state to the microphone 10, this processing flow chart is repeatedly executed at a predetermined
control cycle (predetermined monitoring timing such as constant, intermittent, etc.).
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[0044]
First, the CPU 24 detects the voltage of the microphone bias line 60 (S101).
[0045]
Next, the detected voltage is compared with the threshold value (S102).
The threshold is stored in advance in the flash ROM 28 and set according to the operating
voltage of the microphone 10.
[0046]
If the detected voltage is equal to or higher than the threshold, no processing is performed. In
this case, the microphone 10 continues to operate with the power supplied from the transmitter
14.
[0047]
On the other hand, if the detected voltage is less than the threshold, the CPU 24 turns on the
switch 64 to substitute the voltage from the codec 22 (S103).
[0048]
Also, the CPU 24 increases or decreases the PGA gain of the codec 22 (S104).
The adjustment method is as follows. That is, the gain value of the PGA is stored in advance in
the flash ROM 28 as a table for each manufacturer of the microphone 10 and / or the transmitter
14. For example, assuming that the manufacturer name of the transmitter 14 is company A,
company B, company C, the company A: gain GaB: gain GbC: gain Gc. These gains Ga, Gb, and Gc
are measured and set in advance as gain values when the recording device 12 supplies
alternative power.
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[0049]
The user of the recording device 12 inputs the manufacturer name of the microphone 10 and /
or the transmitter 14 from the switch 42. The CPU 24 reads the gain value of the PGA
corresponding to the manufacturer name input from the switch 42 from the table, and increases
or decreases the gain value of the PGA so as to be the gain value.
[0050]
The CPU 24 may be configured to automatically identify the manufacturer name and other
attributes of the connected microphone and transmitter 14 and read out the corresponding gain
value from the table in response thereto.
[0051]
Thus, by adjusting the gain together with the alternative power, it is possible to back up and
record the audio signal from the microphone 10 with high quality.
[0052]
As mentioned above, although embodiment of this invention was described, this invention is not
limited to this, A various deformation | transformation is possible.
[0053]
For example, in the present embodiment, the recording device 12 supplies the power to the
microphone 10 instead of the transmitter 14 and adjusts the gain to compensate for the change
in the audio signal level. At the same time, frequency characteristics (equalizer characteristics)
may be adjusted.
The table in this case is, for example, as follows.
Company A: gain Ga, frequency characteristic faB: gain Gb, frequency characteristic fbC: gain Gc,
frequency characteristic fc
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[0054]
In addition, if the shapes of the input interface (IN) and the output interface (OUT) of the
recording device 12 correspond to the manufacturer of the microphone 10 and / or the
transmitter 14, the microphone 10 and the transmitter 14 of any manufacturer are connected As
it is known or known, gain values and / or frequency characteristics corresponding to the
manufacturer may be stored in the flash ROM 28.
[0055]
Further, in the present embodiment, there is one kind of audio signal level, but a dual recording
configuration may be adopted in which the audio signal is recorded in advance at two levels of
high level and low level. When power is supplied to the microphone 10 instead of 14, the gains
of both the high level and low level systems may be adjusted.
Company A: high gain Gha, low gain GlaB: high gain Ghb, low gain GlbC: high gain Ghc, low gain
Glc, and the like.
[0056]
Further, in the present embodiment, the CPU 24 automatically supplies alternative power to the
microphone 10 when the voltage of the microphone bias line 60 becomes lower than the
threshold, but it goes without saying that the user operates the switch 42 to substitute Whether
to supply power may be set manually.
[0057]
Further, in the present embodiment, when the alternative power is supplied, the gain is adjusted
to compensate the level of the audio signal, but the “compensation” of the audio level is not
necessarily the original level (the power from the transmitter 14 is It does not have to be equal to
the level of the audio signal obtained in the case of supply, and it may be a gain adjustment to
such an extent that the reduction of the level of the audio signal can be suppressed.
Depending on the type of transmitter 14 connected, when the recording device 12 supplies
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alternative power, a level difference of about 20 dB may occur with the original audio signal, so
this level difference is substantially eliminated. It is sufficient if the gain adjustment can be
performed as much as possible.
[0058]
Further, in the present embodiment, the process may be changed according to the remaining
capacity (SOC: State of Charge) of the battery 44 of the recording device 12.
Specifically, if the remaining capacity is 30% or more, the alternative power is supplied and the
gain (or frequency characteristic) is adjusted, and if it is less than 30%, the alternative power is
supplied to adjust the gain (or frequency characteristic) It is not.
[0059]
Furthermore, in the present embodiment, the microphone line 20 is directly connected from the
input interface (IN) to the output interface (OUT), and a part of the microphone line 20 is
connected to the codec (CODEC) 22. Although it is possible to record an audio signal from the
microphone 10 without being connected to the interface (OUT), also in this case, it is assumed
that the supply voltage from the transmitter 14 is 0 V and less than the threshold, the recording
device 12, instead of the transmitter 14, may supply alternative power to the microphone 10 to
adjust gain and frequency characteristics. In this case, the gain value or the like according to the
manufacturer of the microphone 10 is adjusted.
[0060]
10 microphones, 12 recording devices (backup recording devices), 14 transmitters, 22 codecs
(CODECs), 24 CPUs, batteries 44, switches 64.
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