JP2002171204A - Audio system and recording control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an audio system capable of properly controlling a recording operation when a communication cable comes off. SOLUTION: A personal computer 1 supplies generated audio data through a USB cable 5 to an audio device 2. A USB-codec 23 acquires the audio data supplied from the personal computer 1, and converts the acquired audio data into an audio signal, and supplies it to an MD player 4 or the like. The MD player 4 data compresses the audio signal supplied from the USB-codec 23, and records the audio signal in an MD as composition data. A USB microcomputer 22 monitors signals periodically transmitted from the personal computer 1, and detects that the USB cable 5 comes off when the signal stops. At the time of detecting that the USB cable 5 comes off, the USB microcomputer 22 transmits a stop command to instruct the stop of a recording operation to the MD player 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a host device and an audio device which are connected via a predetermined communication cable, and which transmits data transmitted from the host device to the audio device via the communication cable by a recording device. The present invention relates to an audio system for recording on a predetermined recording medium, and more particularly to an audio system and a recording control method capable of appropriately controlling a recording operation when a communication cable is disconnected.

[0002]

2. Description of the Related Art Conventionally, electronic devices such as printers and modems connected to a host device such as a personal computer have been known. Such an electronic device includes, for example, an interface such as RS232C or Centronics, is connected to a host device via a predetermined cable, and operates according to control from the host device.
Recently, USB (Universal Serial Bus) and the like have attracted attention as interface standards adopted for host devices. This USB is supported by a general OS (Operating System) installed in the host device, and can be connected while the power of the electronic device is turned on. It features plug-and-play that can automatically set up.

[0003] This USB is an "Isochronous" (Isoc) which assumes electronic equipment classified as a multimedia device.
For example, audio data can be transmitted in real time from a host device to an audio device (electronic device). At this time, since the audio data transmitted by USB is digital data, the audio data is hardly affected by noise or the like, and the audio device can output high-quality music sound.

FIG. 3 shows an example of an audio system using such a USB interface. As illustrated, the audio system includes a personal computer 100, an audio device 110, a speaker 120, and an MD player 130. Note that the personal computer 100 and the audio device 110 are connected via a USB cable 140.

[0005] Personal computer (personal computer) 10
0 generates audio data according to an audio application (song playing software) to be executed or the like, and transmits the generated audio data to the USB cable 140.
, To the audio device 110. The audio device 110 is an electronic device having a USB interface, and includes a USB_CODEC 111, a D / A converter 112, and an amplifier circuit 113.

[0006] The USB_CODEC 111 includes, for example, U
CODEC (COde) that also has a communication function in accordance with the SB standard
(r / DECoder) IC and the like, and sequentially obtains audio data (such as an isochronous transfer frame) supplied from the personal computer 100. Then, the acquired audio data is converted into an audio signal, and is sequentially supplied to the D / A converter 112 and the MD player 130. D /
A converter (digital / analog converter) 112
Converts the audio data (digital data) sent from the USB_CODEC 111 into an analog signal, and converts the converted audio signal (analog signal) to the amplifier circuit 1.
13. The amplifier circuit 113 appropriately amplifies the audio signal supplied from the D / A converter 112 and supplies the amplified audio signal to the speaker 120.

The speaker 120 emits a predetermined sound in accordance with the audio signal supplied via the amplifier circuit 113. An MD (mini-disc) player 130 is a recording device that records (records) music data on an MD serving as a recording medium, and a USB_CODEC of the audio device 110.
The audio signal transmitted from 111 is subjected to data compression, and music data (audio signal after data compression) is recorded on the MD.

As described above, the audio system supplies the audio data obtained by playing the music on the personal computer 100 to the audio device 110 via the USB cable 140, and outputs the audio data as high-quality music sound data to the MD device. The information can be recorded by the player 130.

[0009]

However, in the above-described audio system, if the USB cable 140 connecting the personal computer 100 and the audio device 110 is disconnected for some reason, the MD player 13
0 has a problem that useless recording operation is continued. That is, when the USB cable 140 is disconnected, audio data is not transmitted to the USB_CODEC 111, and the USB_CODEC 111 supplies an audio signal such as silence to the MD player 130. Then, the MD player 130 continues to record audio signals such as silence on the MD.

[0010] The present invention has been made in view of the above circumstances, and has as its object to provide an audio system and a recording control method capable of appropriately controlling a recording operation when a communication cable is disconnected.

[0011]

To achieve the above object, an audio system according to a first aspect of the present invention comprises:
An audio system in which a host device and an audio device are connected via a detachable communication cable, and audio data transmitted from the host device to the audio device via the communication cable is recorded on a predetermined recording medium by a recording device. And detecting means for detecting disconnection of the communication cable while the recording device is recording audio data, and detecting the disconnection of the communication cable,
And control means for stopping the recording operation of the recording apparatus.

According to the present invention, while the recording device is recording audio data, the detection means periodically transmits the audio data from the host device to the audio device via a communication cable (USB cable or the like). The disconnection of the communication cable is detected from the disconnection of the signal. When the detecting means detects the disconnection of the communication cable, the control means stops the recording operation of the recording apparatus, for example, by supplying a stop command for instructing the recording apparatus to stop the recording operation. As a result, when the communication cable is disconnected, the recording operation can be appropriately controlled.

The detection means monitors a signal periodically transmitted from the host device to the audio device via the communication cable, and detects the disconnection of the communication cable when the signal is interrupted, and The means may stop the recording operation of the recording device by supplying a stop command for instructing the recording device to stop the recording operation.

In order to achieve the above object, in an audio system according to a second aspect of the present invention, a host device and an audio device are connected via a detachable communication cable, and are connected to the host device via the communication cable. An audio system that records audio data transmitted to an audio device on a predetermined recording medium in a recording device,
A situation acquisition unit for acquiring a current operation situation in the recording device, and disconnection of a signal transmitted periodically via the communication cable together with the audio data causes disconnection of the communication cable from either the host device or the audio device. Instructing to stop the recording operation when the operation state of the recording apparatus is acquired by the detecting means for detecting and the state acquiring means that the recording apparatus is performing the recording operation, and when the disconnection of the communication cable is detected by the detecting means. Control means for supplying a stop command and an erase command for instructing erasure of audio data being recorded from the recording medium to the recording device, respectively.

According to the present invention, the status obtaining means obtains the current operating status of the recording device. The detecting means is:
Communication cable (eg, USB) with audio data
The disconnection of a cable from any of the host device and the audio device is detected by disconnection of a signal transmitted periodically via the cable or the like. The control means, when the operation status of the recording apparatus is obtained by the status obtaining means that the printing operation is being performed, and when the disconnection of the communication cable is detected by the detecting means, a stop command for instructing stop of the printing operation, and An erasing command for instructing erasure of audio data being recorded from the recording medium is supplied to the recording device. As a result, when the communication cable is disconnected, the recording operation can be appropriately controlled.

In order to achieve the above object, a recording control method according to a third aspect of the present invention is a recording control method in which a host device and an electronic device are connected via a detachable communication cable, and the host device is connected via the communication cable. A recording control method in a system for recording data transmitted from an electronic device to a predetermined recording medium in a recording device, wherein the recording device transmits a signal transmitted via a communication cable together with the data during a recording operation. A detecting step of detecting disconnection of the communication cable due to the disconnection, and supplying a stop command to stop the recording operation to the recording apparatus when the disconnection of the communication cable is detected in the detecting step; And a control step of stopping the operation.

According to the present invention, the detecting step detects disconnection of the communication cable due to disconnection of a signal transmitted via a communication cable (for example, a USB cable or the like) together with data during the recording operation of the recording apparatus. . In the control step, when the disconnection of the communication cable is detected in the detection step, a stop command instructing to stop the recording operation is supplied to the recording device, and the recording operation of the recording device is stopped. As a result, when the communication cable is disconnected, the recording operation can be appropriately controlled.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS US according to an embodiment of the present invention
An audio device having a B (Universal Serial Bus) interface will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an example of a configuration of an audio system including an audio device applied to an embodiment of the present invention. As shown, the audio system includes a personal computer 1, an audio device 2,
It comprises a speaker 3 and an MD player 4. The personal computer 1 and the audio device 2 are connected via a USB cable 5.
And the MD player 4 are connected via a system signal line 6.

Personal computer (personal computer) 1
Are an input unit such as a keyboard and a mouse, a storage unit such as a memory and a hard disk, and a CPU (Central Processing Unit).
nit), a display unit (output unit) such as a display, and a USB interface unit. The personal computer 1 stores music performance software (audio application), music files to be played, and the like in a storage unit (such as a hard disk). Then, the personal computer 1 starts playing a predetermined audio file in response to a performance start instruction input from the input unit. Specifically, the personal computer 1 generates audio data from a music file, and sequentially supplies the generated audio data to the audio device 2 via the USB cable 5.

The audio device 2 is a device provided with a USB interface, and as shown in FIG.
USB microcomputer 22, USB_CODEC 23, D
A / A converter 24 and an amplifier circuit 25 are included.

The hub 21 branches and collects communication data according to the USB standard. Specifically, the hub 21 is a USB
It relays control data communication between the microcomputer 22 and the personal computer 1, and relays audio data communication between the USB_CODEC 23 and the personal computer 1.

The USB microcomputer 22 is an IC having a communication function according to the USB standard, and transmits control data (frame data and the like) to the personal computer 1 via the hub 21. Further, the USB microcomputer 22 monitors a predetermined signal periodically transmitted from the personal computer 1 through the hub 21, and is connected between the audio device 2 and the personal computer 1 when the transmission of the signal is interrupted. It detects that the USB cable 5 has been disconnected. Further, the USB microcomputer 22 sends a predetermined command to the MD player 4 via the system signal line 6. Specifically, when the USB microcomputer 22 detects that the USB cable 5 has been disconnected during the recording operation by the MD player 4, the USB microcomputer 22 outputs a stop command for instructing to stop the recording operation, and a command for stopping the recording (track). An erasure command instructing erasure is transmitted to the MD player 4.

The USB_CODEC 23 is, for example, a US
CODEC (COder /
An audio data (isochronous transfer frame or the like) supplied from the personal computer 1 via the hub 21 or the like is sequentially acquired. Then, the acquired audio data is converted into an audio signal, and D / D
It is sequentially supplied to the A converter 24 and the MD player 4. The USB_CODEC 23 is an MD player 4
Receives audio data transmitted from the MD player 4 via an optical communication cable or the like when reproducing music data, converts the received audio data into an audio signal, and sequentially supplies the audio signal to the D / A converter 24. .

The D / A converter (digital / analog converter) 24 converts the audio signal (digital data) sent from the USB_CODEC 23 into an analog signal, and supplies the converted audio signal (analog signal) to the amplifier circuit 25.

The amplifier circuit 25 includes a D / A converter 24
The audio signal supplied from is supplied to the speaker 3 after being appropriately amplified.

The speaker 3 emits a predetermined sound in accordance with the audio signal supplied via the amplifier circuit 25.

An MD (mini-disc) player 4 records (records) music data on an MD serving as a recording medium.
This is a recording / reproducing device for reproducing music data recorded on an MD. Specifically, the MD player 4 compresses data of an audio signal supplied from the audio device 2 by operating an operation unit including a recording key for instructing the start of a recording operation, a stop key for instructing a stop of the recording operation, and the like. MD as data
A communication unit for transmitting / receiving predetermined commands to / from the audio device 2 via the system signal line 6; , And a processing control unit that controls the entire MD player 4.

More specifically, when the recording key is pressed by the user on the operation unit, the MD player 4 compresses the audio signal sent from the USB_CODEC 23 of the audio device 2 by the recording unit, and stores the music data (data The compressed audio signal) is recorded (recorded) on the MD. Also,
During the recording operation, the MD player 4 operates the USB microcomputer 22.
As soon as a stop command is sent from, the recording operation is stopped.

Hereinafter, the operation of the audio system according to the embodiment of the present invention will be described with reference to FIG.
FIG. 2 is a flowchart illustrating a recording process performed by the MD player 4 (the processing control unit and the like) and a recording control process performed by the audio device 2 (the USB microcomputer 22 and the like). The recording process and the recording control process are performed on the personal computer 1 after the personal computer 1 and the audio device 2 are connected via the USB cable 5 and the audio device 2 and the MD player 4 are connected via the system signal line 6. This is started after a predetermined audio application is started.

First, the MD player 4 (processing control unit)
Wait until the recording key is pressed (step S1)
1). That is, the MD player 4 waits for the execution of the subsequent processing until the recording key instructing the start of the recording operation is pressed by the user.

When the MD player 4 determines that the recording key has been pressed, the MD player 4 transmits recording start information to the audio device 2 (step S12). That is, the MD player 4
Supplies start information indicating that the recording operation has started to the USB microcomputer 22 via the system signal line 6.

On the other hand, when the start information is sent from the MD player 4, the USB microcomputer 22 of the audio device 2 determines that the start information has been received (step S 21) and receives a signal periodically sent from the personal computer 1. It is determined whether it is in the middle (step S22). That is, the USB microcomputer 22 monitors a control signal periodically transmitted from the personal computer 1 through the hub 21 and determines whether the USB cable 5 is disconnected.

If the USB microcomputer 22 determines that a signal from the personal computer 1 is being received, it determines whether stop information has been received from the MD player 4 (step S2).
3). That is, the USB microcomputer 22 determines whether or not the recording operation is stopped by the user operation on the MD player 4 and the stop information is transmitted from the MD player 4 via the system signal line 6 accordingly. USB microcomputer 2
If it is determined that the stop information has not been received, the process returns to step S22, and the above-described steps S22 and S2
The processes such as 3 are repeatedly executed.

On the other hand, when the MD player 4 transmits the start information to the audio device 2 in step S12 described above,
The music data is recorded on the MD to be recorded (step S1)
3). That is, the MD player 4 uses the USB_CODE
The audio signal sent via C23 is data-compressed and sequentially recorded on the MD as music data.

In parallel, the MD player 4 determines whether or not the stop key has been pressed (step S14). That is, it is determined whether or not a stop key of the operation unit is pressed by a user's operation and an instruction to stop the recording operation is issued.

When the MD player 4 determines that the stop key has not been pressed, it determines whether a stop command has been received (step S15). That is, the MD player 4 connects the audio device 2 via the system signal line 6.
It is determined whether or not a stop command has been transmitted from. MD
When determining that the stop command has not been received, the player 4 returns the process to step S13, and repeatedly executes the processes of steps S13 to S15 described above.

If it is determined in step S14 that the stop key has been pressed, the MD player 4 transmits recording stop information to the audio device 2 (step S1).
6). That is, stop information indicating that the recording operation has been stopped is transmitted to the audio device 2 via the system signal line 6.

On the other hand, when the stop information is transmitted, the USB microcomputer 22 determines in step S23 that the stop information has been received, and ends the recording control process as it is. If it is determined in step S22 that the signal has not been received from the personal computer 1 (the signal to be transmitted from the personal computer 1 has been interrupted), the USB microcomputer 22 supplies a stop command to the MD player 4 (step S22). S24).
That is, the USB microcomputer 22 determines that the USB cable 5 has been disconnected, and transmits a stop command to stop the recording operation to the MD player 4 via the system signal line 6.

Then, the USB microcomputer 22 subsequently supplies an erase command to the MD player 4 (step S2).
5). That is, since the USB cable 5 has been disconnected, the supply of audio data is interrupted halfway, and an erasing command for instructing erasing of a track (song data) that has not been normally recorded on the MD is transmitted to the MD player 4.

On the other hand, when the stop command is sent from the USB microcomputer 22, the MD player 4 determines in step S15 that the stop command has been received, and stops the recording operation (step S17). Note that, even after the stop information is transmitted to the audio device 2 in step S16, the MD player 4
Stops the recording operation.

Then, the MD player 4 determines whether or not the erase command has been continuously received (step S18).
When it is determined that the erase command has been received, the track whose recording has been stopped is erased from the MD (step S19).
That is, the MD player 4 deletes the music data being recorded.

As described above, while the audio data (song data) supplied from the personal computer 1 via the audio device 2 is being recorded by the MD player 4, the USB cable connecting the personal computer 1 and the audio device 2 is used. 5
Is lost for some reason, the recording operation in the MD player 4 is automatically stopped. Furthermore,
The music data being recorded in the MD player 4 is also appropriately deleted. As a result, when the USB cable 5 is disconnected, the recording operation can be appropriately controlled.

In the above embodiment, the case where audio data is transmitted between the personal computer 1 and the audio device 2 has been described. However, the transmitted data is not limited to audio data and is arbitrary. For example, it may be image data.

In the above embodiment, the personal computer 1
The audio device 2 has a USB interface, and the personal computer 1 and the audio device 2 have a USB interface.
Although the audio system connected via the cable 5 has been described, the interface provided in the personal computer 1 and the audio device 2 is not limited to USB, but is arbitrary.
For example, an interface such as IEEE 1394 may be used, and the personal computer 1 and the audio device 2 may be connected via an IEEE 1394 cable.

[0046]

As described above, according to the present invention,
When the communication cable is disconnected, the recording operation can be appropriately controlled.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a configuration of an audio system including an audio device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a recording process and a recording control process according to the embodiment of the present invention.

FIG. 3 is a block diagram illustrating an example of a configuration of an audio system including a conventional audio device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Personal computer 2 Audio device 3 Speaker 4 MD player 5 USB cable 6 System signal line 21 Hub 22 USB microcomputer 23 USB_CODEC 24 D / A converter 25 Amplifier circuit

Claims (4)

[Claims] A host device and an audio device are connected via a detachable communication cable, and audio data transmitted from the host device to the audio device via the communication cable is transmitted to a predetermined recording medium by a recording device. An audio system for recording the audio data in a recording device, wherein the recording device detects the disconnection of the communication cable while the recording device is recording the audio data; An audio system comprising: control means for stopping the operation of the audio system. A detecting means for monitoring a signal periodically transmitted from the host device to the audio device via the communication cable, and detecting the disconnection of the communication cable when the signal is interrupted; The audio system according to claim 1, wherein the control unit stops the recording operation of the recording device by supplying a stop command for instructing the recording device to stop the recording operation. 3. A host device and an audio device are connected via a detachable communication cable, and audio data transmitted from the host device to the audio device via the communication cable is transmitted to a recording medium by a recording device. An audio system for recording the current operating status of the recording device; and a disconnection of a signal periodically transmitted through the communication cable together with the audio data, whereby any one of the host device and the audio device can be recorded. Detecting means for detecting the disconnection of the communication cable from the device; and if the operating state of the recording device is acquired by the status acquiring means that the recording operation is being performed, and the disconnection of the communication cable is detected by the detecting means. The stop command for instructing the stop of the recording operation and the deletion of the audio data being recorded from the recording medium Audio system characterized in that it and a control means for supplying each recording device an erase command for instructing. 4. A host device and an electronic device are connected via a detachable communication cable, and data transmitted from the host device to the electronic device via the communication cable is transferred to a predetermined recording medium by a recording device. A recording control method in a recording system, wherein during a recording operation of a recording device, a disconnection of a signal transmitted via a communication cable together with data detects a disconnection of a communication cable; and And a control step of, when the disconnection of the communication cable is detected, supplying a stop command for instructing to stop the recording operation to the recording device, and stopping the recording operation of the recording device.