JPH0563875B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a DAT device, and in particular, to a tape recorder with the main parts around the mechanism and signal processing circuit,
It is divided into two parts: the input/output circuit and the auxiliary part around the power supply circuit, and the equipment on the auxiliary part is installed both in the vehicle and at home, and the main part is used for both the vehicle and the home. This invention relates to a DAT device that is selectively connected to auxiliary equipment so that each device functions as a complete tape recorder.

[Prior Art] Recently, there is a strong demand for high-quality reproduced sound from audio equipment, and in order to meet this demand, digitalization of equipment is progressing rapidly.

One of these digital audio devices is R-
There is a DAT (rotary tilt azimuth magnetic recording/reproducing device). This R-DAT generally uses a rotating head to detect PCM signals stored on tape.
A signal processing circuit restores the original digital audio sample signal, and a D/A converter converts it to an analog audio signal and outputs it to an external amplifier, or vice versa. The digital audio sample signal is converted into a digital audio sample signal by a /D converter, subjected to processing such as addition of an error correction code, interleaving, modulation, etc. by a signal processing circuit, and then stored on a tape by a head.

[Problems to be solved by the invention] By the way, if you want to enjoy music using R-DAT both at home and in your car, the in-vehicle R-DAT set converts the car's battery voltage to the required voltage using a DC-DC converter. However, if you use it for home use, you will need a separate power supply that converts 100V AC to DC, and since it is only for playback, you cannot record.

On the other hand, a household R-DAT set only converts AC100V to DC voltage, but when used in a car, a separate DC-DC converter is required, and since the set is large, it must be installed inside the car. It is impossible.

Of course, it would be possible to prepare separate sets for in-vehicle use and home use, but this would be expensive and uneconomical.

In view of the above-mentioned problems, the object of the present invention is to provide a DAT device that can be used for both in-vehicle and home use, is economical, has excellent sound quality, and is advantageous in terms of crime prevention. do.

[Means for Solving the Problems] The DAT device according to the present invention includes a tape running means for running the tape, a head for recording and playback, and a digital audio sample signal from the tape signal read by the head during playback. and a signal processing means that converts the digital audio sample signal input from the outside into a predetermined recording format signal and outputs it to the head during recording, and allows the predetermined signal input/output line and power input line to be freely connected to the outside. a first device comprising a connector;
The first device is mounted on a vehicle and is removable, and includes a D/A conversion means for converting a digital audio sample signal input from the first device into an analog signal, and a predetermined DC voltage from an on-vehicle battery. a second device comprising a power supply means for connecting the first device to the first device; and a connector for connecting the power output line and the signal input line of the power supply means to the first device; D/A conversion means for converting a digital audio sample signal input from the first device into an analog signal; and A/D conversion means for converting the analog audio signal input from the outside into a digital audio sample signal and outputting it to the first device. and a third device comprising a power source means for generating a predetermined DC voltage from a commercial power source, and a connector that allows the power output line and signal input/output line of the power source means to be freely connected to the first device; It is characterized by being composed of.

[Example] Embodiments of the invention will be described with reference to the drawings.

FIG. 1 shows the configuration of an R-DAT device according to the present invention.

The main parts of the R-DAT, including the mechanical part and the vicinity of the signal processing part, form a portable main body device 10.

On the other hand, on the vehicle console or instrument panel,
Detachable case 1 to which the main device 10 is detachably attached
2, an in-vehicle auxiliary device 14 including the output circuit area of the R-DAT, a power supply circuit, a tuner, etc. are installed, and at home, there is an attachment/detachment hole 16 in which the main device 10 is detachably attached, and Household auxiliary equipment 18 including the input/output circuit area, power supply circuit, display/operation area, and others is installed.

When using R-DAT in a vehicle, main unit 1
0 to the in-vehicle auxiliary device 14 to complete the in-vehicle system and enjoy R-DAT at home,
The main device 10 is attached to the household auxiliary device 18 to complete the household system.

To specifically explain the main unit 10, the vehicle-mounted auxiliary device 14, and the household auxiliary device 18, first, the main unit 10 has a tape running system, a rotary head, a motor, etc. inside a case 20, as shown in FIG. A mechanical section 22 is provided, and the rotary head is equipped with a recording/recording unit 22.
A signal processing circuit 26 is connected through a recording/reproducing amplifier 24 that also serves as a re-recording/reproducing device. During playback, the recorded signal read by the rotary head is subjected to digital data synchronous demodulation, deinterleaving, and error correction, and then converted into a digital signal. The audio sample data is restored, and at the time of recording, an error correction code is added, interleaved, and modulated to the digital audio sample data, and the data is digitally recorded onto a tape by a rotating head. Further, the signal processing circuit 26 outputs the subcode to the reading system microcomputer 28 during reproduction, and conversely records the subcode from the outside onto the tape during recording. Further, the signal processing circuit 26 outputs a mute signal when not outputting digital audio sample data.

The mechanical part 22 includes a mechanical microcomputer 30 and a servo circuit 3.
Under the control of 2, the pinch roller is pressed and released,
It performs operations such as reversing and constant speed rotation of the reel and drum motor, causing the tape to play at a predetermined running speed, and fast forwarding and rewinding.

A display/operation panel 34 is provided on the front of the case 20, and includes normal playback operation keys such as the PALY key, stop key, and fast forward key, as well as high/low frequency enhancement necessary when used as an in-vehicle system. Ski, Chuna control key, tape/
A tuner switching key, a VR key, etc. are also provided, and in conjunction with these, various display sections such as a normal regenerator operation display, a tuner operation display, and a VR display are also provided.

The display/operation panel 34 is a system microcomputer 28
The system microcomputer 28 receives various key inputs, executes predetermined system control processing based on the built-in program, and issues PLAY commands and fast-forward commands to the mechanical microcomputer 30.
Input the subcode from the signal processing circuit 26,
Outputs subcodes to the signal processing circuit 26, sends and receives control signals and other signals to external equipment,
It performs various display controls on the display/operation panel 34.

Further, a regulator 36 is provided inside the case 20, and the DC power supply voltage input from the outside is stabilized and supplied to each part of the main device 10.

The input power line of the regulator 36, the input/output line for digital audio sample data to the signal processing circuit 26, and the control line for the signal processing circuit 26 and the system microcomputer 28 are connected to a connection connector attached to the rear outside of the case 20. It is connected to 38.

Next, to explain the in-vehicle auxiliary device 14, a connecting connector 40 that can be freely connected to a connecting connector 38 is bonded to the rear inner side of the detachable case 12 that allows the main device 10 to be attached and detached. is connected to a car audio set 44 via a cable 42. The car audio set 44 includes a D/A that is connected to the digital audio data output line on the main unit 10 side.
A converter 46 is provided, and the D/A converter 46 converts the signal into an analog audio signal.
The output side of the D/A converter 46 is connected to one audio input side of the electronic volume 50 via the LPF 48, and the electronic volume 50 is connected to the LPF.
When the 48 side is selected, the tape playback audio signal from which high-frequency noise has been removed by the LPF 48 is level-adjusted by the electronic volume 50. The output of the electronic volume 50 passes through an output amplifier 52 and a mute circuit 54, and is output from an external connection connector (not shown) to a power amplifier as 2ch L and R signals. A tuner 56 (PLL frequency synthesizer type electronic tuning tuner) is connected to the other audio input side of the electronic volume 50, and when the electronic volume 50 selects the tuner 56 side, the tuner 56 and the tuner 56 The level of the received signal is adjusted by an electronic volume 50.

The D/A converter 46, tuner 56, electronic volume 50, and mute circuit 54 are connected to the control line from the main unit 10 side, and perform emphasis control, tuning control, tuner/tape switching control, VR control, tuner/tape switching control. And the on/off control of Mute is performed. Mute circuit 54 is also controlled by tuner 56.
In addition, the control line from the main unit 10 side is also connected to the power amplifier to turn on/off the amplifier power.
Off is made.

A DC-DC converter/regulator 60 is provided in the car audio set 44.
The car battery voltage is input to form a predetermined stabilized DC voltage, which is supplied to each part of the set, and DC power is also supplied to the main unit 10 via the connection connector 40.

Here, the operation of the in-vehicle system completed by attaching the main body device 10 to the in-vehicle auxiliary device 14 will be explained.

In advance, the main body device 10 is inserted into the removable case 12, and the connection connector 38 and the connection connector 40 are connected. First, when IG.SW is turned on, DC−
The output voltage of the DC converter/regulator 60 is supplied to each part within the vehicle-mounted auxiliary device 14 and is also input to the regulator 36 on the main device 10 side.
The output voltage of the regulator 36 is supplied to each part within the main unit 10, and the system becomes operational. Initially, when the tape/tuner switch key is on the tape side, the input of the electronic volume 50 is switched to the LPF 48 side under the control of the system microcomputer 28, and
The control input of the mute circuit 54 is the signal processing circuit 26
switch to the side and enter the mute-on state.

If you want to play the tape, turn on the PLAY key. The system microcomputer 28 is the mechanical microcomputer 3
0, gives a PLAY command to the signal processing circuit 26, causing the tape to play, reading the tape signal by the head, outputting digital audio sample data and subcode from the signal processing circuit 26, and outputting mute off. Further, the system microcomputer 28 gives a power-on command to the power amplifier to turn on the amplifier power. The mute circuit 54 is energized by the mute off output of the signal processing circuit 26 to release the mute. The system microcomputer 28 inputs the subcode from the signal processing circuit 26 and displays the song number etc. on the display/operation panel 34. The digital audio sample data output from the signal processing circuit 26 is converted into an analog audio signal by the D/A converter 46, passed through the LPF 48, and the volume is adjusted by the electronic volume 50, and then sent to the output amplifier 52 and the mute circuit 54. After that, it is output to a power amplifier as 2ch L and R signals, and is output as an audio signal. Therefore, the user can enjoy digital car audio.

UP/VR key on display/operation panel 34
When the DOWN operation is performed, the system microcomputer 28 controls the electronic volume 50 to vary the volume according to the operation of the VR key. Also, when the high frequency emphasis key is operated, the system microcomputer 28 controls the D/A converter 46 to raise the high frequency range, and when the low frequency emphasis key is operated, the system microcomputer 28 controls the D/A converter 46. and boosts the low range. Note that when the stop key on the display/operation panel 34 is operated, the system microcomputer 28 issues a stop command to the mechanical microcomputer 30 and the signal processing circuit 26 to stop tape running and signal reading. The signal processing circuit 26 outputs a mute-on signal to the mute circuit 54 at the same time as signal reading is stopped, thereby causing the mute to be applied. Further, the system microcomputer 28 turns off the power to the power amplifier.

If you wish to receive radio broadcasts separately from this, you can switch the tape/tuner switch key to the tuner side and operate the tuner control key to select a desired song. When the tape/tuner switching key is set to the tuner side, the system microcomputer 28 controls the electronic volume 50 to set the input to the tuner 56 side, and also controls the mute circuit 54 to set the mute control input to the tuner 56 side, and Turn on the power amplifier. The tuner 56 outputs a mute-on signal to the mute circuit 54 to apply mute unless a broadcast signal is received.

When the user selects a preset song by operating the tuner control keys, the system microcomputer 28 reads frequency data for the channel specified by the user from the channel memory, controls the tuner 56 based on this data, and selects the specified channel. It tunes to the received frequency and causes the display/operation panel 34 to display the frequency.

The tuner 56 changes the receiving frequency under the control of the system microcomputer 28, and when it catches a broadcast station, outputs a mute-off signal to the mute circuit 54 to cancel mute, and also outputs the received broadcast signal to the electronic volume 50. The electronic volume 50 adjusts the level of the broadcast signal in accordance with the volume control signal sent from the system microcomputer 28, and outputs the 2ch L and R signals to the power amplifier via the output amplifier 52 and mute circuit 54 for sound output.

This allows the user to enjoy listening to the car radio.

Of course, by operating the VR key on the display/operation panel 34, the reception volume can be varied, and in addition to preset reception, automatic music selection can also be performed.

Note that if the user removes the main device 10 from the removable case 12 and takes it home with him when getting off the vehicle, the relatively expensive main device 10 can be prevented from being stolen.

Next, to specifically explain the household auxiliary device 18 side, a detachable hole 16 is formed in the upper half of the front surface of the case 62, and the main device 10 can be attached and detached. A connection connector 38 is provided inside the rear part of this attachment/detachment hole 16.
A connecting connector 63 is attached which can be freely connected to. The digital audio data input/output line on the main unit 10 side is connected via a switching circuit 64 to a high-precision D/A converter 66 and a digital I/O 6 on the output side.
8. Input side is digital I/O 68 and high precision A/
It is connected to the D converter 70. When digital audio sample data is input from the main device 10 side to the D/A converter 66 via the switching circuit 64, it is converted into an analog audio signal. An LPF 72 and a mute circuit 7 are connected to the output side of the D/A converter 66.
It is connected to the L and R2ch output terminals via the LPF 72, and the tape playback audio signal from which high-frequency noise has been removed by the LPF 72 is outputted from the output terminal to an external amplifier or the like.

The mute circuit 74 is connected to the control line from the main device 10 side, and is connected to the signal processing circuit 2
The mute is turned on and off according to the mute on/off signal output in step 6.

The output side of the A/D converter 70 is connected to the L and R2 input terminals via the LPF 76, and after the LPF 76 suppresses the occurrence of aliasing for the analog audio signal input from an external player, etc. The data is converted into digital audio sample data by the A/D converter 70 and input to the main device 10 via the switching circuit 64.

The digital I/O 68 is connected to a digital input/output terminal, and when digital audio sample data is input from the main unit 10 side via the switching circuit 64, it is synchronized by the PLL 78 and converted into a predetermined digital I/O format. and output to external DAT etc. Conversely, if you input data that follows the digital I/O format from the outside,
While synchronizing with the PLL 78, it is converted into digital audio sample data and output to the main device 10 side via the switching circuit 64.

Switching control of the switching circuit 64 and digital I/O 68 is performed by a sub-microcomputer 80. A display/operation panel 82 is provided at the lower front half of the case 62. This display/operation panel 82 includes normal recording operation keys such as the recording key and recording operation key, as well as a subcode input key, analog/digital input/output switching key, REC/PB level meter, and recording operation display. There are several departments, etc.

The display/operation panel 82 is connected to the sub-microcomputer 80. The sub-microcomputer 80 is also connected to the control line of the main device 10,
Based on the built-in program, predetermined system support processing is executed in response to key input operations on the display/operation panel 82 and control signal input from the main device 10 side, and switching control is performed on the switching circuit 64 and digital I/O 68. or output the recording system or subcode system key code to the main unit 10 side,
It drives the REC/PB level meter and controls the display on the display/operation panel 82.

In addition, a power supply circuit 84 is provided inside the case 62, which forms a predetermined DC voltage from the commercial power input from the AC outlet 86, supplies power to each part in the vehicle auxiliary device 14, and connects the connection connector. Power is also supplied to the main unit 10 side via 63. Here, the operation of the home R-DAT system completed by attaching the main unit 10 to the home auxiliary device 18 will be explained.

In advance, the main body device 10 is inserted into the attachment/detachment hole 16, and the connection connector 38 and the connection connector 63 are engaged. When the AC outlet 86 is plugged into an electrical outlet, the output voltage of the power supply circuit 84 is changed to the household auxiliary device 1.
8 and is also input to the regulator 36 on the main unit 10 side.
The output voltage is supplied to each part within the main unit 10, and the system becomes operational.

Switch the tape/tuner switch key to the tape side in advance. At this time, the mute circuit 74 applies mute to the mute-on signal output from the signal processing circuit 26.

When performing speaker playback from a tape, connect the amplifier/speaker system to the output terminal, switch the analog/digital input/output switch key on the display/operation panel 82 to the analog side, and
Turn on the PLAY key. The system microcomputer 28 first outputs a reproduction mode signal to the sub microcomputer 80. The sub-microcomputer 80 controls the switching circuit 64 and connects the digital audio sample data output line from the main device 10 side to the D/A converter 66.

Next, the system microcomputer 28 is the mechanical microcomputer 3.
0, gives a PLAY command to the signal processing circuit 26, causing the tape to play, reading the tape signal by the head, outputting digital audio sample data and subcodes, and outputting mute off from the signal processing circuit 26. The mute circuit 74 is energized by the mute-off output of the signal processing circuit 26 to release the mute. The system microcomputer 28 inputs the subcode from the signal processing circuit 26 and displays the song number etc. on the display/operation panel 34. The digital audio sample data outputted from the signal processing circuit 26 is converted into an analog audio signal with high accuracy by the D/A converter 66, and then sent to the LPF 72,
The signals are outputted as 2ch L and R signals to the amplifier/speaker system through the mute circuit 74, and are output as sound. Therefore, the user can enjoy high-quality digital home audio.

Note that during tape playback, the sub-microcomputer 80 inputs digital audio sample data from the switching circuit 64, drives the REC/PB level meter on the display/operation panel 82 in accordance with this input level, and outputs the playback level.

Conversely, when digitally recording onto a tape from an external player, for example, connect the player to the input terminal, switch the analog/digital input/output switch key on the display/operation panel 82 to the analog side, and put the player in the PLAY state. Turn on the recording key on the display/operation panel 82. Sub microcomputer 80
controls the switching circuit 64, connects the output side of the A/D converter 70 to the digital audio sample data input line to the main device 10 side, and sends the recording key code to the system microcomputer 28 on the main device 10 side. Output.

The analog audio signal input from the player has high frequencies removed by the LPF 76, and is then converted into digital audio sample data with high precision by the A/D converter 70, and is input to the signal processing circuit 26.

The system microcomputer 28 is energized by the input of the recording key code and gives commands to the mechanical microcomputer 30 and the signal processing circuit 26 to run the tape during recording, convert digital audio sample data into recorded data, and process the tape recording by the head. Write. This allows high-quality digital recording.

During tape recording, the sub-microcomputer 80 inputs digital audio sample data from the switching circuit 64, drives the REC/PB level meter on the display/operation panel 82 in accordance with this input level, and outputs the recording level. If you want to write subcodes at the same time as recording, use the display/operation panel 8.
When the subcode input key 2 is operated to input a subcode, the key code is output from the submicrocomputer 80 to the system microcomputer 28, and the signal processing circuit 26 records the subcode on tape. At this time, the system microcomputer 28 displays the subcode information entered by the user on the display/operation panel 34.

Separately, when outputting tape playback to an external DAT, connect other devices to the digital input/output terminal.
Connect the DAT, switch the analog/digital input/output operation switch key on the display/operation panel 82 to the digital side, put the other DAT in the recording state, and display/
Turn on the PLAY key on the operation panel 34. The sub microcomputer 80 inputs the playback mode signal from the system microcomputer 28, controls the switching circuit 64, connects the digital audio sample data output line from the main device 10 side to the digital I/O 68, and connects the digital I/O 68 to the digital audio sample data output line from the main device 10 side. Set to output mode.

Subsequently, the system microcomputer 28 gives a PLAY command to the mechanical microcomputer 30 and the signal processing circuit 26 to play back the tape. The digital audio sample data output from the signal processing circuit 26 is sent to the digital I/O 68 and converted into a predetermined digital I/O format.
Output to DAT and digital-to-digital recording.

Conversely, when performing digital recording from an external DAT, connect the DAT on the source side to the digital input/output terminal, switch the analog/digital input/output switch key on the display/operation panel 82 to the digital side, and play the DAT on the source side. state, and turn on the recording key on the display/operation panel 82. Sub microcomputer 80
controls the switching circuit 64 to connect the digital audio sample data input line on the main unit 10 side to the digital I/O 68, and
Set the O68 to input mode and output the recording key code to the system microcomputer 28.

The digital I/O 68 converts the digital signal in a predetermined format input from the source side DAT into digital audio sample data and sends it to the main unit 10.
output to the side.

System microcomputer 2 where the recording key code was input
8 gives a recording command to the mechanical microcomputer 30 and the signal processing circuit 26, and the signal processing circuit 26 converts the data into recording data, which then records the data on a tape.

This allows high-quality digital-to-digital recording.

According to this embodiment, R
-Installing the in-vehicle auxiliary device 14 and household auxiliary device 18 including the input/output portion of the DAT and the power supply circuit;
If the main unit 10 including the mechanical and processing parts of R-DAT is attached to the in-vehicle auxiliary device 14, an in-vehicle system is completed and digital playback becomes possible, and if the main unit 10 is attached to the home auxiliary device 18, it can be used at home. With the completion of the system for digital recording and playback, one main unit 10 can be used for both in-vehicle and home use depending on the TPO, thereby reducing costs and eliminating the need to use the in-vehicle system. When the in-vehicle auxiliary device 14 to the main device 1
You can easily prevent theft by removing the 0 and taking it home. In addition, the main unit 10 and the vehicle auxiliary mounting 1
4. Or, since signals are digitally exchanged through the connection between the main unit 10 and the household auxiliary device 18, greenhouse deterioration due to contact resistance of the connection does not occur, and especially the D/A converter of the household auxiliary device 18. 66
By increasing the accuracy of the A/D converter 70, a high-spec home system can be realized. moreover,
Since a tuner function is added to the vehicle-mounted auxiliary device 14 and the music selection is controlled by the system microcomputer 28 of the main device 10, the music can be enjoyed together with the car radio with a small burden on installation space. In addition, the main device 10 and the in-vehicle auxiliary device 14,
Alternatively, when the main device 10 and the household auxiliary device 18 are attached or detached, they can be automatically connected and disconnected using the connector, so there is no need to make electrical connections and disconnections using connection cords or the like.

Note that if the on-vehicle auxiliary device is installed in each of a plurality of vehicles, the on-vehicle system can be used in each vehicle.
In addition, the in-vehicle auxiliary device is equipped with an amplifier and speakers, making the whole device small and lightweight, and can also be carried by hand if desired.In addition to the car battery, dry batteries (an AC adapter may be added) However, it may be possible to make it move so that it can be used like a radio cassette player.

[Effects of the Invention] The DAT device according to the present invention includes a tape running means for running the tape, a head for recording and playback, and a digital audio sample signal that is reproduced from the tape signal read by the head during playback, and is used for recording. At the time, a signal processing means converts a digital audio sample signal inputted from the outside into a predetermined recording format signal and outputs it to the head, and a connector allows the predetermined signal input/output line and power input line to be freely connected to the outside. configure the equipment,
The first device is removably attached to the vehicle, and the first device is removably attached to the vehicle.
D/A conversion means for converting a digital audio sample signal input from the device into an analog signal;
A second device is equipped with a power source that generates a predetermined DC voltage from an on-vehicle battery, and a connector that allows the power output line and signal input line of this power source to be freely connected to the first device. The first device is detachable, and includes an A/D conversion means for converting a digital audio sample signal inputted from the first device into an analog signal, and an A/D conversion means for converting an externally input analog audio signal into a digital audio sample signal. A/D conversion means for converting the DC voltage into a predetermined DC voltage and outputting it to the first device, a power source means for forming a predetermined DC voltage from a commercial power source, and a power output line and a signal input/output line of the power source means are connected to the first device. By installing a third device with a flexible connector, one first device can be shared between the vehicle and the home, which is economical, and the second device can be connected to the vehicle when not in use. Theft can be prevented by removing the first device from the device, and digital Since signals are sent and received using the same device, deterioration in sound quality is less likely to occur, and since the electrical connections between each device are made by directly connecting them with connectors, it does not take much effort to connect them.

[Brief explanation of the drawing]

FIG. 1 shows an R-DAT according to an embodiment of the present invention.
The system configuration diagram of the device, Figure 2 is a block diagram of the main unit, Figure 3 is a block diagram of the in-vehicle auxiliary device,
FIG. 4 is a block diagram of the household auxiliary device. 10: Main device, 14: In-vehicle auxiliary device, 1
8: Household auxiliary device, 22: Mechanical part, 26: Signal processing circuit, 38, 40, 63: Connector for connection,
44: Car audio set, 46, 66:
D/A converter, 60: DC/DC converter/regulator, 70: A/D converter, 84: power supply circuit.

Claims (1)

[Scope of Claims] 1. A tape running means for running the tape, a head for recording and playback, and a digital audio sample signal for reproducing a digital audio sample signal from a tape signal read by the head during playback and input from an external source during recording. a first device comprising a signal processing means for converting a digital audio sample signal into a predetermined recording format signal and outputting the signal to the head; and a connector that allows the predetermined signal input/output line and power input line to be freely connected to the outside; , a D/A that is mounted on the vehicle and that the first device is removable and converts a digital audio sample signal input from the first device into an analog signal;
a second device comprising a conversion means, a power source means for generating a predetermined DC voltage from an on-vehicle battery, and a connector that allows a power output line and a signal input line of the power source means to be freely connected to the first device; , the first device is detachable, and includes a D/A conversion means for converting a digital audio sample signal input from the first device into an analog signal, and a D/A conversion means for converting an analog audio signal input from the outside into a digital audio sample signal. A/D conversion means for outputting to the first device, a power source means for forming a predetermined DC voltage from a commercial power source, and a power output line and a signal input/output line of the power source means can be freely connected to the first device. A DAT device comprising: a third device having a connector; and a third device having a connector.