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JP2004109502

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DESCRIPTION JP2004109502
A media conversion device for converting digital data into analog data enables data processing.
SOLUTION: A digital effect processing unit 28 of a media conversion device 11 receives digital
data received from the outside by a 1394 I / F unit 20 based on the processing content and
processing degree set by the operation unit 30 received by the interface unit 29. Process the
When the processed digital data is audio data, it is converted into analog data by the audio
processing unit 31 including the audio data A / D / D / A conversion unit 32 and transmitted to
the outside. When the processed digital data is image data, it is converted into analog data by the
image processing unit 34 including the image data A / D · D / A conversion unit 35 and
transmitted to the outside. [Selected figure] Figure 2
Converter, data transmission method and data transmission system
The present invention relates to an apparatus for converting digital data into analog data by a
conversion device and transmitting the converted analog data to an analog device, and in
particular, processing the data to be transmitted by the conversion device It is what makes it
possible. Conventionally, digital devices and analog devices are connected by a media conversion
device, and the media conversion device converts digital data and analog data so that data can be
transmitted between the devices. There are in-vehicle data transmission systems. FIG. 4 shows a
conventional data transmission system 1 including a media conversion device 2. The media
conversion device 2 connects the DVD device 3 to the digital connection port 2a with the
network cable 6, and to the analog connection port 2b. The amplifier apparatus 4 is connected by
the wire harness 7a. Further, a speaker 5 is connected to the amplifier device 4 by a wire harness
7 b. In the data transmission system 1 configured as described above, when a DVD (Digital
Versatile Disc) is reproduced by the DVD device 3, digital audio data output from the DVD device
3 is converted into analog audio data by the media conversion device 2. Is transmitted to the
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amplifier device 4. Also, the amplifier device 4 adjusts analog audio data to a required state by
the volume switch 4a, the high-tone adjustment switch 4b, the low-pitch adjustment switch 4c,
etc., which it has, and transmits it to the speaker 5 to transmit it to the speaker The adjusted
voice is output. In addition, the system which connected various vehicle equipment is disclosed
by the following gazette (refer patent document 1). As described above, the conventional media
conversion apparatus 2 enables conversion of digital data and analog data. However, it does not
have the function of adjusting the volume, the adjustment of the treble, the adjustment of the
bass, etc. performed by the amplifier device 4. Therefore, when converting digital audio data into
analog audio data and outputting it from the speaker 5, there is a problem that the amplifier
device 4 is always required. In addition, when various effects such as echo and arrangement are
added to the audio data, it is necessary to intervene between the media conversion device 2 and
the speaker 5 an effector device capable of adding this kind of effect to the audio data. The
Further, the amplifier device 4 occupies a limited internal space of the vehicle S, and a plurality
of wire harnesses 7a and 7b are required from the media conversion device 2 to the speaker 5,
and the wire harnesses 7a and 7b There is also a problem that the wiring work to the vehicle S
becomes complicated.
In particular, since the amplifier device 4 is often installed at the center console of the instrument
panel of the vehicle S, when the speaker 5 is installed at the rear of the cabin, the total length of
the wire harness 7b connecting both becomes long. The burden of wiring work also increases. In
addition, in the media conversion device 2, not only audio data but also image data may be D / A
converted and transmitted. For example, a DV (digital video) camera and an analog monitor
brought into a vehicle are connected to the media conversion device 2, digital image data of the
DV camera is converted to analog image data by the media conversion device 2, and displayed on
the analog monitor Is also possible. However, in this case as well, it has been impossible
conventionally to process and edit the brightness, image quality and the like of the image data
itself to be displayed by the media conversion device 2. The present invention has been made in
view of such circumstances, and by providing processing means of various data in the media
conversion device, the conversion device capable of processing data to be transmitted by the
media conversion device, data transmission Method and data transmission system Another object
of the present invention is to provide a conversion device capable of processing data in detail by
allowing the contents to be processed by the media conversion device and the processing degree.
According to a first aspect of the present invention, there is provided a converter according to
the first aspect of the present invention, which is an on-vehicle converter for performing D / A
conversion, and data processing means for processing digital data received from the outside; It is
characterized by comprising: conversion means for performing D / A conversion of digital data
processed by the means; and transmission means for transmitting to the outside analog data
subjected to D / A conversion by the conversion means. The conversion apparatus according to
the second aspect of the present invention further includes processing content receiving means
for receiving the processing content of the digital data, and the data processing means is
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configured to perform the digital processing based on the processing content received by the
processing content receiving means. It is characterized by processing data. In the conversion
device according to the third aspect of the present invention, the digital data is voice data, and
the processing content of the voice data changes at least one of the size of voice, high and low
voice, long and short voice, and voice timbre. It is characterized by being. The conversion device
according to the fourth aspect of the present invention further comprises processing degree
receiving means for receiving the processing degree for the processing content received by the
processing content receiving means, and the data processing means is processing performed by
the processing degree receiving means. And processing the digital data based on the degree.
In a data transmission method according to a fifth aspect of the present invention, the digital
device transmits digital data, the conversion device receives the digital data, converts it into
analog data, and transmits the analog data from the conversion device to the analog device In the
data transmission method, the conversion device processes the received digital data, and
converts the processed digital data into analog data. A data transmission system according to a
sixth aspect of the present invention is an on-vehicle data transmission system in which a
converter for converting digital data transmitted by a digital device into analog data transmits
the converted analog data to the analog device. The data processing apparatus is characterized
by comprising: data processing means for processing the digital data; and conversion means for
converting digital data processed by the data processing means into analog data. In the first
invention, the fifth invention and the sixth invention, since the conversion device is provided with
data processing means for processing digital data, the data processed by the conversion device
can be transmitted to the analog device, so Configuration can be simplified. For example, it
becomes possible to perform the function of a conventional amplifier device for audio data with a
conversion device, making the amplifier device unnecessary, and limiting the limited space in the
vehicle occupied by the amplifier device up to now to other applications. It can be used. Further,
the number of wire harnesses connecting the amplifier device and the speaker can be reduced
and the wiring form can be simplified, and depending on the mounting position of the conversion
device on the vehicle, the wire harness length can be shortened. In the second aspect of the
invention, the conversion device includes the processing content receiving means, and the
processing of data is performed based on the received processing content, so that the required
processing can be surely performed by the conversion device. As such processing content
receiving means, a means such as an interface unit that receives the processing content
instructed by the passenger of the vehicle as an instruction signal corresponds. Therefore,
various processing contents are connected by connecting various operation switches integrally or
separately provided to the conversion device, a monitor having a touch panel function, etc. to the
interface unit and a passenger of the vehicle operates the switch or the touch panel. It is possible
to process data smoothly by accepting required processing contents from among the above. In
the third aspect of the invention, when the digital data is voice data, the processing content is
changed to at least one of the size of voice, the height of voice, the length of voice, the length of
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voice, and the voice. It is possible to reliably perform the function of the conventional amplifier
device in the conversion device.
In addition to the above, it is also possible to include an effect process in which an effect such as
an echo and an arrangement is added to the process content of the audio data. Furthermore,
when the digital data is image data, it is modified to change the size, lightness, saturation, image
quality, color tone, etc. of the image, and processed by effect processing to add effects such as
patterns, figures, and other images. It may be included in the content. In the fourth aspect of the
invention, since the conversion device is provided with the processing degree reception means,
the conversion device can grasp the degree of processing the data in the received processing
contents, and more detailed data processing can be realized. For example, when the conversion
device receives the processing content to strengthen the high sound for the voice data, the
processing degree reception unit receives the degree to strengthen the high sound, so the
conversion device performs data processing in consideration of the received processing degree
The voice data can be changed to the required high pitch. Also, for image data, when the
lightness of the original image is low, the conversion device accepts the extent to which the
lightness is increased by the processing degree reception means, and corrects too low lightness
to appropriate lightness and is good. You can get an image. DESCRIPTION OF THE PREFERRED
EMBODIMENTS The present invention will be described below based on the drawings showing
the embodiments thereof. FIG. 1 shows the overall configuration of a data transmission system
10 according to an embodiment of the present invention. The data transmission system 10 is a
system built in the vehicle S, and is connected to the vehicle S from the outside while connecting
the digital camera 13 and the DVD device 14 which are on-vehicle digital devices by the media
conversion device 11 corresponding to a conversion device. The DV camera 15 is also connected.
Further, to the media conversion device 11, a speaker 16, a microphone 17 and an analog
monitor 18 which are on-vehicle analog devices are also connected by analog cables 19a to 19c.
The media conversion device 11 applies IEEE 1394 which is a network standard of serial
interface to connection of digital devices, and daisy chain method of each digital devices 13 to 15
corresponding to IEEE 1394 with the connection cables 12 a to 12 c To form an IEEE 1394
network 12. Each of the digital devices 13 to 15 outputs digital data in the IEEE 1394 format.
FIG. 2 shows the internal configuration of the media conversion device 11. The media conversion
device 11 includes a 1394 I / F (interface) unit 20 that transmits and receives digital data to and
from each digital device 13-15. The control unit 24 performs control of the digital effect
processing unit 28, and the sound processing unit 31 and the image processing unit 34 that
perform D / A conversion of converted digital data and data transmission to the outside.
The 1394 I / F unit 20 further includes a PHY (PHY) LSI 21, a link control LSI 22, and an image
RAM 30. The LSI 21 is connected to the digital connection port 11a of the media conversion
device 11, and transmits and receives digital data of the IEEE 1394 format through the digital
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connection port 11a. Further, since data is serially transmitted in IEEE 1394, the file LSI 21 also
has a function of converting serial data received from the digital connection port 11 a into
parallel data and converting parallel data received from the link control LSI 22 into serial data.
The link control LSI 22 connected to the file LSI 21 converts the IEEE 1394 format of the digital
data received from the file LSI 21 into a normal format and transmits the data to the digital effect
processing unit 28. The link control LSI 22 converts the digital data of the normal format
received from the digital effect processing unit 28 into the IEEE 1394 format and transmits the
converted data to the file LSI 21 in reverse to the above. The image RAM 23 to which the link
control LSI 22 is connected temporarily stores various data related to the conversion process.
The control unit 24 connected to the link control LSI 22 includes a CPU 25, a ROM 26 and a
RAM 27. The CPU 25 performs overall control processing of the media conversion apparatus 11,
and the ROM 26 is a program related to control processing of the CPU 25. Is stored, and the
RAM 27 temporarily stores data related to control processing of the CPU 25. On the other hand,
the digital effect processing unit 28 connected to the link control LSI 22 corresponds to data
processing means for processing digital data received from each of the digital devices 13 to 15,
and is used as processing content receiving means and processing degree receiving means It is
connected to the operation unit 30 via the corresponding interface unit 29. The digital effect
processing unit 28 processes digital data transmitted from the link control LSI 22 based on the
processing content and processing degree from the operation unit 30 received by the interface
unit 29. The digital effect processing unit 28 can process audio data including music and image
data corresponding to a still image and a moving image. The audio data and the image data have
different contents to be processed.
For audio data, perform processing to change the pitch of the sound, the size of the sound, length
and shortness of the sound, change the timbre and sound quality, and further add processing
such as echo, rhythm and arrangement to the sound (music) . On the other hand, for image data,
in addition to the process of changing the image size, changing the image quality, changing the
image resolution, the image tone, the image brightness, etc., effects such as mosaic, blur, graphic
and fill Perform additional processing. Further, the digital effect processing unit 28 can process
the processing degree in the various processing contents described above stepwise in accordance
with the setting operation of the operation unit 30, and, for example, for the height of sound, The
processing to emphasize in three steps is performed by the setting operation of the operation
unit 30. The digital effect processing unit 28 transmits the data to the image processing unit 34
if the processed digital data is image data after performing such modification and effect addition
processing, and in the case of audio data, Data is transmitted to the voice processing unit 31. The
digital effect processing unit 28 also accepts digital data obtained by converting the analog data
by the audio processing unit 31 and the image processing unit 34, and the 1394 I / F unit is
processed without processing the received digital data in this manner. Transmit to 20. The
operation unit 30 is provided with various switches and buttons corresponding to the processing
content and processing degree of the digital effect processing unit 28 described above, and by
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operating these switches and buttons, the processing content and processing degree are The
instruction signal is transmitted to the interface unit 29. The operation unit 30 has a structure in
which switches and buttons for operating the processing degree can be set stepwise. The
interface unit 29 receives the transmitted instruction signal, arranges the contents of the signal,
and transmits the signal to the digital effect processing unit 28. The audio processing unit 31 to
which audio data is transmitted from the digital effect processing unit 28 is an A / D / D / A for
audio data corresponding to a conversion means for converting digital data into analog data (D /
A conversion) A converter 32 and an amplifier 33 are provided. The audio data A / D / D / A
converter 32 converts the digital audio data subjected to the processing into analog audio data
and transmits the analog audio data to the amplifier 33. The audio data A / D / D / A converter
32 is connected to the analog audio input terminal 11 c of the media conversion device 11, and
analog audio data received from the analog audio input terminal 11 c is It also functions as
means for converting digital audio data and transmitting the converted digital audio data to the
digital effect processing unit 28.
Therefore, the audio acquired by the microphone 17 connected to the analog audio input
terminal 11c shown in FIG. 1 is converted from analog to digital audio data by the audio data A /
D / D / A conversion unit 32, and thus 1394I Transmission to digital equipment is possible via
the / F unit 20. Further, the amplification unit 33 of the audio processing unit 31 is connected to
a volume switch (not shown) provided in the operation unit 30, and the A / D for audio data is
interlocked with the setting position of the volume switch. The analog audio data transmitted
from the D / A converter 32 is amplified to a desired size. The amplified analog audio data is
transmitted from the analog audio output terminal 11 b and output as audio from the speaker
16. Therefore, as described above, the magnitude of the sound of the audio data can be adjusted
in two places by the operation of the amplification unit 30 corresponding to the volume switch
or the processing of the volume in the digital effect processing unit 28. Further, the image
processing unit 34 to which the image data from the digital effect processing unit 28 is
transmitted has an image data A / D / D / A conversion unit 35 as a conversion means, and the
processing is performed. The converted digital image data is converted to analog image data (D /
A conversion). The image data A / D · D / A conversion unit 35 transmits the analog image data
thus converted from the analog image output terminal 11 d to the analog monitor 18. The image
data A / D / D / A conversion unit 35 is also connected to the analog image input terminal 11e,
and is connected to an analog device such as an analog video camera capable of outputting
analog image data. It also converts data into digital image data and transmits it to the digital
effect processing unit 28. Next, in the data transmission system 10 described above, a series of
processes relating to a data transmission method of processing digital audio data of a DVD
reproduced by the DVD device 14 and then outputting it from the speaker 16 is shown in the
flowchart of FIG. It explains based on. In the media conversion device 11, it is assumed that the
processing content and the processing degree for enhancing the high sound of the audio data by
three steps are set in advance by the operation unit 30. First, digital audio data in the IEEE 1394
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format is transmitted from the DVD device 14 with the media conversion device 11 as the
destination (S 1). The media conversion device 11 accepts digital audio data transmitted through
the IEEE 1394 network 12 (S2).
The media conversion device 11 converts the format of the received digital audio data from IEEE
1394 to a normal format by the link control LSI 22 (S 3), and the digital effect processing unit 28
sets the high-pitched sound previously set by the operation unit 30. To enhance the treble of the
digital audio data based on the instruction signal to intensify the three steps (S4). The digital
voice data in which the high tone is intensified is converted into analog voice data by the voice
data A / D / D / A conversion unit 32 (S5). Next, it is judged whether or not the setting of
amplification is performed on the audio data by the volume switch (S 6), and when the setting is
performed (S 6: YES), the analog voice is detected by the amplification unit 33 After the data is
amplified (S7), it is transmitted to the speaker 16 (S8). The analog voice data thus transmitted is
outputted as a voice from the speaker 16 and the processing is completed. Also, when the setting
of amplification is not performed by the volume switch (S6: NO), analog audio data is transmitted
to the speaker 16 without amplification (S8), and output from the speaker 16 at the volume of
the audio data itself. Ru. Although the above-described processing method has been described
based on the processing content and processing level to increase the high sound of the voice data
by three steps, the media conversion device 11 of this embodiment is another processing content
and processing level relating to the voice data. Can be processed by the same processing method.
As described above, in the data transmission system 10 according to the present embodiment,
since the audio data is processed by the media conversion device 11, the amplifier device used in
the conventional system is unnecessary and the system is simplified. In addition to being able to
construct, it becomes possible to process data according to the function of the conventional
effect device. In addition, when the media conversion device 11 is mounted at the central portion
of the vehicle compartment, the length of the analog cable 19a used for connection with the
speaker 16 can be shortened, and the burden of wiring the cable (wire harness) in the vehicle is
incurred. Can also be reduced. Furthermore, digital image data captured by digital devices such
as the digital camera 13 and the DV camera 15 undergo the same processing as the flowchart of
FIG. 3, and the above-described processing is performed based on the content set by the
operation unit 30. The various effects are performed by the digital effect processing unit 28. That
is, digital image data in the IEEE 1394 format sent from the digital device is received by the
1394 I / F unit 20 of the media conversion device 11 and subjected to format conversion, and
then various changes or addition of effects are performed by the digital effect processing unit 28.
The processing mentioned above is performed.
Therefore, for example, even when the lightness of the digital image data is insufficient because
the image is picked up, the digital effect processing unit 28 of the media conversion device 11
performs processing to increase the lightness, so that the lightness is appropriately applied. The
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corrected image can be displayed on the analog monitor 18. The data transmission system 10,
the media conversion device 11, and the data transmission method according to the present
embodiment can be applied to various modifications other than the above-described
embodiment. For example, a monitor device provided with a touch panel function having a switch
according to processing content and processing degree may be connected to the media
conversion device 11 via the interface unit 29. Alternatively, the operation unit 30 may be
separated from the media conversion device 11 and the instruction signal may be transmitted to
the interface unit 29 by remote control (wireless). As described above, by enabling the
instruction of the processing content and the processing degree by the monitor device having the
touch panel function or the separate operation unit, the degree of freedom of the mounting place
of the media conversion device 11 on the vehicle is improved. Therefore, it is also possible to
install the media conversion device 11 with an emphasis on the wiring workability of the
network cable and the wire harness. Further, a vehicle speed sensor provided in the vehicle may
be connected to the interface unit 29 of the media conversion device 11, and the interface unit
29 may receive a signal corresponding to the current speed from the vehicle speed sensor. In
addition to such a configuration, when the digital effect processing unit 28 performs processing
to increase the volume of the audio data when the signal for the predetermined speed or more is
received from the vehicle speed sensor, the traveling sound is increased. Even in the case, it is
possible to automatically form a state where the user can hear the voice well. In addition, when
the digital image processing unit 28 performs an effect process such as filling the image black
when the image data has a predetermined speed or more, the displayed image hinders the
driver's driving operation. You may make it prevent. Furthermore, the ROM 26 of the control unit
24 stores a program or a table that defines the content and the degree of processing according to
the type of data to be transmitted, and the digital effect processing unit 28 stores these programs
and Processing may be performed based on a table, and the operation unit 30 and the interface
unit 29 may be omitted.
Furthermore, when only processing of audio data is performed, the part related to processing of
image data from media conversion device 11 can be omitted, and when only processing of image
data is performed, part related to processing of audio data from media conversion device 11 May
be omitted. As described above in detail, in the first invention, the fifth invention and the sixth
invention, since the conversion device performs data processing and D / A conversion, there are
other devices. The conversion device can bear the above-described functions, and the number of
devices included in the system can be reduced to simplify the overall system configuration. In
addition, the wiring configuration of the conversion device and the wire harness for connecting
the analog devices can be simplified, and the system construction for the vehicle can be
improved. According to the second aspect of the invention, the conversion device receives the
processing content and processes the data based on the received processing content, so that the
required processing can be performed reliably even when there are a plurality of processing
contents. . In the third aspect of the present invention, required processing can be performed on
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audio data. In the fourth aspect of the invention, the conversion device receives the processing
degree and performs data processing based on the received processing degree, so that more
detailed data processing can be realized. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an
overall configuration diagram of a data transmission system according to an embodiment of the
present invention. FIG. 2 is an internal configuration diagram of a media conversion device. FIG.
3 is a flowchart according to a data transmission method. FIG. 4 is an entire configuration
diagram of a conventional data transmission system. [Description of Code] 10 data transmission
system 11 media conversion device 12 IEEE 1394 network 13 digital camera 14 DVD device 15
DV camera 16 speaker 18 analog monitor 20 1394 I / F unit 28 digital effect processing unit 29
interface unit 32 A / D for audio data・ D / A converter 35 A / D / D / A converter for image data
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