JP2007124315A - Audio system and recording control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an audio system capable of automatically stopping recording when a cable is disconnected during recording. <P>SOLUTION: In the audio system 1 wherein an acoustic reproducing apparatus 2 and a recording apparatus 3 are connected via the communication cable 4 and the recording apparatus 3 records an acoustic signal transmitted from the acoustic reproducing apparatus 2 to the recording apparatus 3 via the communication cable 4 to a prescribed recording medium, the acoustic reproducing apparatus 2 includes a control signal transmission section 23 that supplies a connection signal being a control signal independent of the acoustic signal and denoting the connection of the communication cable 4 to the recording apparatus 3. The recording apparatus 3 includes: a control signal reception section 31 for detecting a recording control signal; and a recording control section 32 for controlling the recording of the acoustic signal to an acoustic signal storage section 34 according to the presence/absence of the connection signal detected by the control signal reception section 31. When no connection signal is detected during recording of the acoustic signal, the recording apparatus 3 stops recording of the acoustic signal and erases the acoustic signal back by a prescribed time. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to an audio system and a recording control method.

  When recording sound such as music on a mini-disc (hereinafter referred to as MD), a song number can be assigned to the head of each song. This song number is called a track mark. A track mark is a segment recorded in the recording portion, and one segment to the next segment is counted as one song. By attaching a track mark to each song, you can select and listen to the song when playing it. When a plurality of songs are recorded on the MD, adding a track mark between songs is called track switching. In the case of recording on an MD, a simple folder division can be performed by assigning each song on the disc to several groups.

  Also, when recording on a magnetic disk device (hereinafter referred to as HDD), one song is made one file, and several songs are put together to form a folder. Even when recording to the HDD, configuring a file for each song is called track switching.

  When a portable memory player using a magnetic disk device or the like is connected to a stereo device with a communication cable and analog audio is recorded from the stereo device to the portable memory player, the track switching operation cannot be automatically performed. When switching tracks, the user has to stop recording on the memory player side and create a new file. Further, since the recording is continued even when the communication cable is disconnected, silence or unnecessary noise is recorded. For this reason, it took time and effort to search up to what song was recorded, delete unnecessary parts, and record again.

  When an audio signal is supplied as digital data, an audio system that can control a recording operation when a communication cable is disconnected has been proposed (see, for example, Patent Document 1 or Patent Document 2).

  Patent Document 1 describes a technique for stopping a recording operation of a recording device when a disconnection of a communication cable is detected. Japanese Patent Application Laid-Open No. H10-228707 controls the recording means to the recording standby state when it is detected that the digital signal is lost, and the recording means when the detecting means detects that the digital signal is input again from the input terminal. Describes a technique for canceling the recording standby state and restarting recording. However, in both Patent Document 1 and Patent Document 2, when an acoustic signal is supplied to the recording device as digital data, the recording is stopped by detecting the absence of the digital signal. Also, the track cannot be switched automatically during recording.

  Patent Document 3 describes a technique for starting recording of an audio signal when an input level exceeds a first threshold. In the technique of Patent Document 3, during recording, when the time from when the input level falls below the second threshold higher than the first threshold to when it exceeds the second threshold exceeds the first predetermined time, it is determined that the interval is between songs. And update the song number. However, depending on the sound to be recorded, it cannot be completely distinguished that the sound is zero and that there is no signal (for example, when the cable is disconnected).

When recording with a cable connected from the headphone terminal of a stereo device, or when recording with LINE from a stereo device with an analog LINE output, it cannot be determined whether or not the cable has been disconnected based on the presence or absence of an audio signal.
JP 2002-171204 A JP-A-9-231636 JP 2002-133773 A

  The present invention has been made in view of the above circumstances, and provides an audio system capable of automatically stopping recording when a cable is disconnected during recording.

In order to achieve the above object, an audio system according to the first aspect of the present invention provides:
The sound reproducing device and the recording device are connected via a detachable communication cable, and the sound signal transmitted from the sound reproducing device to the recording device via the communication cable is recorded by the recording device. An audio system for recording on a medium,
The sound reproduction device includes a control signal supply means for supplying a connection signal indicating that the communication cable is connected to the recording device, which is a control signal independent of the sound signal,
The recording device is
Control signal detecting means for detecting the presence or absence of the connection signal;
Recording control means for controlling recording of the acoustic signal on the predetermined recording medium according to the presence or absence of the connection signal detected by the control signal detection means;
With
The recording control means includes
If the connection signal is not detected, stop recording the acoustic signal to the predetermined recording medium;
It is characterized by that.

Further, the control signal supply means includes
When the connection signal is not detected, after the recording of the acoustic signal to the predetermined recording medium is stopped, the recorded sound for a predetermined time from the position where the recording to the predetermined recording medium is stopped Go back and erase the signal,
It is characterized by that.

  Preferably, the control signal supply means supplies the connection signal to the recording device using a signal line different from a line for transmitting the acoustic signal of the communication cable.

  Alternatively, the control signal supply means superimposes the connection signal on the acoustic signal using at least one of the lines for transmitting the acoustic signal of the communication cable, and the connection signal is transmitted to the recording device. Supply.

In the recording control method according to the second aspect of the present invention, the sound reproducing device and the recording device are connected via a detachable communication cable, and transmitted from the sound reproducing device to the recording device via the communication cable. A recording control method in an audio system for recording the acoustic signal thus recorded on a predetermined recording medium by the recording device,
The sound reproduction device includes a step of supplying a connection signal indicating that the communication cable is connected to the recording device, which is a control signal independent of the sound signal,
The recording device is:
A control signal detecting step for detecting the presence or absence of the connection signal;
And a step of stopping recording of the acoustic signal to the predetermined recording medium when the connection signal is not detected.

  According to the audio system of the present invention, recording can be automatically stopped when a cable is disconnected during recording. It is also possible to create a file that does not contain unnecessary records.

(Embodiment 1)
Embodiment 1 of an audio system according to the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing an audio system 1 according to Embodiment 1 of the present invention.

  In the audio system 1 according to Embodiment 1, as shown in FIG. 1, a sound reproducing device 2 and a recording device 3 are connected via a communication cable 4.

  The sound reproduction device 2 includes an external input unit 21, a reproduction control unit 22, a control signal transmission unit 23, and an acoustic signal reproduction unit 24. The external input unit 21 includes a key switch or a touch panel, and the user operates the key switch to select a music to be played, play an acoustic signal of the selected music, and record synchronized with the playback of the acoustic signal. And the like are transmitted to the reproduction control unit 22.

  The reproduction control unit 22 instructs the acoustic signal reproduction unit 24 to reproduce and stop the acoustic signal according to the command input from the external input unit 21. The reproduction control unit 22 receives information such as a break (track mark) and end of music from the acoustic signal reproduction unit 24. Then, the reproduction control unit 22 instructs the control signal transmission unit 23 to supply the recording device 3 with a recording control signal for controlling recording in synchronization with the acoustic signal.

  The control signal transmission unit 23 converts a recording control signal, which will be described later, into a DC voltage level, for example, and transmits it to the recording device 3.

  The acoustic signal reproducing unit 24 includes a medium on which acoustic data is recorded, such as a compact disc (CD), a DVD (Digital Versatile Disc), a mini disc (MD), or a magnetic disc (HDD), and a reproducing device thereof. The The acoustic signal reproducing unit 24 reproduces the acoustic data recorded on the medium according to the instruction of the reproduction control unit 22 and transmits the acoustic signal to the recording device 3. The acoustic signal transmitted to the recording device 3 may be an analog audio signal or a digital signal. In addition, the playback control unit 22 is instructed about the break (track mark) and end information of the acoustic data to be played back.

  The reproduction control unit 22 can be configured by a microcomputer including a CPU (Central Processing Unit), a memory, and an input / output unit, for example. Further, the reproduction control unit 22, the control signal transmission unit 23, and the acoustic signal reproduction unit 24 can be configured by a DSP (Digital Signal Processor).

  The recording device 3 includes a control signal receiving unit 31, a recording control unit 32, an encoding unit 33, an acoustic signal storage unit 34, and an input unit 36.

  The control signal receiving unit 31 receives the recording control signal transmitted from the control signal transmitting unit 23 and transmits the recording control signal to the recording control unit 32.

  The recording control unit 32 starts recording, stops recording, records a track mark or creates a file, creates a folder, etc. according to a recording control signal transmitted from the control signal receiving unit 31. The signal storage unit 34 is instructed and executed.

  The encoding unit 33 receives the acoustic signal transmitted from the acoustic reproduction device 2. Further, the received acoustic signal is encoded into a format to be recorded in the acoustic signal storage unit 34. When the acoustic signal is transmitted as an analog audio signal, the encoding unit 33 performs A / D conversion and further encodes the acoustic signal. When the acoustic signal is transmitted as a digital signal, if the sampling frequency and the number of bits match the recording data format of the recording device 3, it is encoded as it is and recorded in the acoustic signal storage unit 34. When the sampling frequency or the number of bits does not match the recording data format of the recording device 3, the sound signal is converted into the sampling frequency and the number of bits of the recording format and encoded. Then, the encoding unit 33 performs recording of the encoded data in the acoustic signal storage unit 34, recording of a track mark, creation of a file, and the like according to a command from the recording control unit 32.

  The acoustic signal storage unit 34 includes a recording medium such as an HDD, MD, or DVD, and a drive device that writes data to the recording medium. The acoustic signal storage unit 34 records the acoustic signal encoded by the encoding unit 33 as file or track data according to the recording format of the recording medium.

  The input unit 36 includes a key switch, a touch panel, and the like, and when a user operates the key switch or the like, commands such as start and stop of recording, selection of music to be played back, playback of audio signals of the selected music, and the like. Tell the recording control unit 32.

  The recording control unit 32 can be constituted by, for example, a microcomputer including a CPU (Central Processing Unit), a memory, and an input / output unit. In addition, the recording control unit 32, the control signal receiving unit 31, and the encoding unit 33 can be combined with a DSP (Digital Signal Processor).

  The communication cable 4 includes the acoustic signal lines 5L and 5R, the control signal line 6, and the GND 7, and is configured as one cable. The acoustic signal lines 5L and 5R transmit the left channel acoustic signal and the right channel acoustic signal, respectively. The control signal line 6 is connected to the control signal transmission unit 23 and transmits, for example, a recording control signal converted to a DC level. The GND 7 determines the reference of the potential of signals (acoustic signal and recording control signal) transmitted from the sound reproducing device 2 to the recording device 3. The communication cable 4 is detachably connected to the sound reproducing device 2 and the recording device 3 through a pin plug or pin jack and a socket or a connector, respectively.

  FIG. 2 is a diagram illustrating an example of a recording control signal of the audio system 1 according to the first embodiment. In the example of FIG. 2, the connection signal C, which is a recording control signal, is represented by a potential with respect to the GND 7 of the control signal line 6. In FIG. 2, the connection signal C indicates that the communication cable is being connected. A voltage of 0 V indicates that there is no connection signal C. When the communication cable 4 is disconnected (disconnected) from the sound reproducing device 2 or the recording device 3 (represented by a point B in FIG. 2), the potential of the control signal line 6 observed by the recording device 3 is 0 (open). Therefore, it can be distinguished from the connection signal C. If control is performed so that recording is stopped when the connection signal C is not detected, recording can be stopped when the communication cable 4 is disconnected, and silence or unnecessary noise can be prevented from being recorded.

  In the example of FIG. 2, the connection signal C is set to a positive voltage level, but the voltage level representing the connection signal C is not limited to the relationship shown in FIG. For example, the connection signal C may be a negative voltage. The connection signal C may not be the potential level of the control signal line 6 as long as it can be distinguished from the state in which the communication cable 4 is disconnected. For example, the connection signal C can be a tone signal using a tone signal of a certain frequency or a combination of a plurality of frequencies. Alternatively, the connection signal C may be that the control signal line 6 and GND 7 are connected via a resistor on the sound reproduction device 2 side, and a loop circuit of the control signal line 6 and GND 7 is formed. The formation of the loop circuit can be detected by a current flowing on the recording device 3 side.

  Next, the operation of the audio system 1 according to Embodiment 1 will be described. FIG. 3 is a flowchart showing an example of the operation of the audio system 1 according to the first embodiment. In this embodiment, since the operation of the sound reproducing device 2 related to the present invention only transmits the connection signal C, only the operation of the recording device 3 is shown in FIG.

  In the sound reproduction device 2, the reproduction control unit 22 instructs the control signal transmission unit 23 to transmit the connection signal C in advance. In response to the connection signal transmission command, the control signal transmission unit 23 transmits the connection signal C to the recording device 3 via the control signal line 6. In the example of FIG. 2, a connection signal C that is a voltage level signal is transmitted.

  In the sound reproducing device 2, it is assumed that a plurality of songs to be reproduced are selected by the user. The sound reproducing device 2 receives a command for reproducing a plurality of selected songs from the external input unit 21. Then, the reproduction control unit 22 instructs the acoustic signal reproduction unit 24 to reproduce the selected song. The acoustic signal reproduction unit 24 reproduces the acoustic signal of the commanded music and transmits it to the recording device 3 via the acoustic signal lines 5L and 5R.

  The recording device 3 waits for a recording command to be input from the input unit 36 (step A1, step A2; No). When a recording command is input from the input unit 36 and transmitted to the recording control unit 32 (step A1, step A2; Yes), the recording control unit 32 instructs the control signal receiving unit 31 to receive the connection signal C. (Step A3). If the connection signal C has not been received (step A3; No), the recording is terminated without starting recording.

  When the connection signal C is received (step A3; Yes), the recording control unit 32 creates a new file in the acoustic signal storage unit 34 and instructs the encoding unit 33 to start recording (step A4). . The encoding unit 33 encodes the acoustic signal received from the acoustic signal lines 5L and 5R and records it in a newly created file in the acoustic signal storage unit 34.

  The recording device 3 monitors the connection signal C and the recording stop input from the input unit 36 while recording (coding the received acoustic signal and recording it in the acoustic signal storage unit 34) ( Step A5). Recording stop is not input from the input unit 36 (step A6; No), and recording is continued while the connection signal C is detected by the control signal receiving unit 31 (step A7; Yes) (step A5).

  When a recording stop command is input from the input unit 36 (step A6; Yes), the recording control unit 32 performs a recording stop process (step A8). The recording control unit 32 instructs the encoding unit 33 to stop recording and closes the recorded file. The encoding unit 33 stops the encoding of the acoustic signal and the recording to the acoustic signal storage unit 34.

  If no recording stop command is input (step A6; No), but the connection signal C is not detected by the control signal receiving unit 31 (step A7; No), the recording control unit 32 stops the recording to the encoding unit 33. And records for a predetermined time are deleted retroactively (step A9). Since an unnecessary acoustic signal is recorded in the time from when the connection signal C stops until it is detected, the unnecessary acoustic signal is deleted. Then, the recorded file is closed.

  While the recording device 3 is recording (step A5), if the communication cable 4 is disconnected from the sound reproducing device 2 or the recording device 3, the connection signal C is stopped, so the operation from the above-described steps A7 to A9. Thus, recording stop processing and retroactive erasure of unnecessary acoustic signals are performed.

  As described above, according to the audio system 1 of the first embodiment, since the connection signal C is transmitted from the sound reproducing device 2 to the recording device 3, recording is automatically performed even when the cable is disconnected during recording. Can be stopped. In that case, unnecessary records for the time to detect that the connection signal C is stopped are deleted retroactively. As a result, unnecessary sounds are not heard when the recorded music is played back. Also, if you play back the last part of the recording, you can easily see how many songs have been recorded normally and from which song you can start recording again.

(Embodiment 2)
Next, a second embodiment in the case where a playback signal, a track mark signal, and a recording stop signal are added to the recording control signal will be described with reference to FIGS.

  FIG. 4 is a block diagram showing an example of the configuration of the audio system 1 according to the second embodiment. The audio system 1 shown in FIG. 4 has no control signal line 6 in the communication cable 4 as compared with the configuration of FIG. Instead, the sound reproducing device 2 is provided with a signal superimposing unit 25, and the recording device 3 is provided with a signal separating unit 35.

  The signal transmitted from the control signal transmission unit 23 is superimposed on one of the acoustic signals by the signal superimposing unit 25. In the example of FIG. 4, the recording control signal is superimposed on the right channel acoustic signal line 5R and transmitted. In the recording device 3, the recording control signal is separated from the acoustic signal by the signal separation unit 35 and input to the control signal receiving unit 31.

  When the acoustic signal is an analog audio signal, the lower limit of the audible band is a few dozen Hz and there is no frequency component lower than that. Therefore, even if a DC component recording control signal is superimposed, the acoustic signal is not affected. Further, the signal separation unit 35 can separate the direct current component and extract it as a recording control signal.

  Even when the acoustic signal is transmitted as a digital signal, the recording control signal of the DC component can be superimposed using a code having no DC component such as an AMI (Alternative Mark Inversion) code.

  FIG. 5 is a diagram showing an example of a recording control signal of the audio system 1 according to Embodiment 2 of the present invention. In the example of FIG. 5, the recording control signal is represented by a potential with respect to the GND 7 of the control signal line 6. In FIG. 5, the reproduction signal R indicates that the music reproduction apparatus 2 is reproducing a music piece. Also, the timing for recording the track mark is represented by a track mark signal T having a predetermined time width. A recording stop signal S is added at the end of the last recording. The recording stop signal S has a voltage level different from those of the in-reproduction signal R and the track mark signal T so as to be distinguished from those signals. The recording stop signal S needs to be distinguishable from the no-signal state and the connection signal C. In the example of FIG. 5, the recording stop signal S is an intermediate voltage between the reproducing signal R and the track mark signal T.

  When the connection signal C is at the voltage level, it represents a state in which neither the playback nor the track mark nor recording is stopped. A voltage of 0 V indicates that there is no signal. When the communication cable 4 is disconnected (disconnected) from the sound reproducing device 2 or the recording device 3, the potential of the control signal line 6 observed by the recording device 3 becomes 0 (open), so that the connection signal C is being reproduced. It can be distinguished from the signal R, the track mark signal T, and the recording stop signal S. If none of the connection signal C, the in-play signal R, the track mark signal T, and the recording stop signal S is detected, the recording is stopped when the communication cable 4 is disconnected. Or it is possible to prevent unnecessary noise from being recorded.

  In the example of FIG. 5, the reproducing signal R is set to a high voltage level, the track mark signal T is set to a low voltage level, and the recording stop signal S is set to an intermediate voltage level. The relationship shown in FIG. For example, the order of high, medium, and low voltage levels may be different from that in FIG. Further, any recording control signal may be a negative voltage. For example, the reproducing signal R may be set to a low voltage level, and the track mark signal T may be set to a high voltage level. Alternatively, one may be a positive voltage and the other may be a negative voltage. Further, the track mark signal T is defined as a voltage level or 0V of the connection signal C having a predetermined time width, for example, 10 ms to 50 ms width, and the track mark signal T is defined by the voltage level of the connection signal C or the duration of 0V. It is possible to distinguish between the signal T and the connection signal C or no signal.

  The recording control signal may not be the potential level of the control signal line 6 as long as it can be distinguished from the state in which the communication cable 4 is disconnected. For example, the connection signal C may be such that the control signal line 6 and GND 7 are connected via a resistor on the sound reproduction device 2 side, and a loop circuit of the control signal line 6 and GND 7 is formed. The formation of the loop circuit can be detected by a current flowing on the recording device 3 side. In this case, for example, the track mark signal T can be a tone signal or a pulse that opens the loop circuit with a predetermined time width.

  FIG. 5 schematically shows a state in which the acoustic signal A is superimposed on the signal R being reproduced. In the case of only the track mark signal T, the recording stop signal S, and the connection signal C, since there is no acoustic signal A, the acoustic signal A is substantially superimposed only on the in-playing signal R, but the acoustic signal A is the track mark signal. Even if superimposed on T or the like, they can be separated, and the acoustic signal A and the recording control signal are independent.

  In Embodiment 2, since the recording control signal is transmitted while being superimposed on the acoustic signal, the number of core wires of the communication cable 4 can be reduced. For example, the structure of a normal stereo cable currently available on the market can be used.

  In the configuration of the audio system 1 of FIG. 4, the recording control signal is superimposed on the right channel acoustic signal line 5R, but the recording control signal may be superimposed on the left channel acoustic signal line 5L. Further, the recording control signals may be divided and superimposed on the left channel and right channel acoustic signal lines 5L and 5R, respectively. When superimposing the recording control signal on one acoustic signal line, the signal superimposing unit 25 and the signal separating unit 35 each need only one circuit. When the recording control signal is divided and superimposed on the two acoustic signal lines 5L and 5R, the signal superimposing unit 25 and the signal separating unit 35 each have two circuits, but the number of voltage levels to be superimposed or separated can be reduced.

  Next, the operation of the audio system 1 according to Embodiment 2 will be described. FIG. 6 is a flowchart showing an example of the operation of the audio system 1 according to the second embodiment. On the left side of FIG. 6, playback control indicates the operation of the sound playback device 2. On the right side of FIG. 6, the recording control shows the operation of the recording device 3.

  In the present embodiment, after the music selected by the sound reproducing device 2 is reproduced, the user can select whether to continue recording in the folder recorded by the recording device 3 or to close the folder once. ing. The folder is continued when, for example, a CD to be played is exchanged, a song is further selected and played back, and the recording apparatus 3 collectively wants to make one folder. Whether or not to continue the folder after playing the selected song is input from the external input unit 21, notified to the playback control unit 22, and stored there.

  In the sound reproducing device 2, it is assumed that a plurality of songs to be reproduced are selected by the user. The sound reproducing device 2 waits for a command (synchronous recording command) to be recorded by the recording device 3 in synchronization with the reproduction of the plurality of selected songs (step B1, step B2; No). When a synchronous recording command is input (step B1, step B2; Yes), the playback control unit 22 commands the control signal transmission unit 23 to transmit the signal R during playback (step B3). The control signal transmission unit 23 receives the in-reproduction signal transmission command and transmits the in-reproduction signal R to the recording device 3 via the control signal line 6. In the example of the recording control signal shown in FIG. 5, a signal R being reproduced which is a high voltage level signal is transmitted. Then, the reproduction control unit 22 instructs the acoustic signal reproduction unit 24 to reproduce the selected music piece (step B4). The acoustic signal reproduction unit 24 reproduces the acoustic signal of the commanded music and transmits it to the recording device 3 via the acoustic signal lines 5L and 5R.

  On the other hand, in the recording device 3, a recording standby command is input from the input unit 36, notified to the recording control unit 32, and waiting for the reproduction signal R to be transmitted from the control signal line 6 (step C1, Step C2; No). When the playback signal R is received by the control signal receiving unit 31 and transmitted to the recording control unit 32 (step C1, step C2; Yes), the recording control unit 32 creates a new file in the acoustic signal storage unit 34. Then, the encoder 33 is instructed to start recording (step C3). The encoding unit 33 encodes the acoustic signal received from the acoustic signal lines 5L and 5R and records it in a newly created file in the acoustic signal storage unit 34. The fact that the recording device 3 starts recording by transmitting the signal R during playback from the sound playback device 2 is indicated by a wavy arrow from step B3 to step C2 in FIG.

  The reproduction control unit 22 monitors the acoustic data during reproduction of the acoustic signal (step B5). That is, it waits for the music being played to end. While the music being played continues (Step B6; No, Step B8; No), the playing signal R is continuously transmitted.

  When the sound signal playback unit 24 is notified that the playback of the music being played ends, it is determined whether or not to transmit the track mark signal T depending on whether or not there is a next selected music (step B6). When there is the next song, that is, when the track mark signal is to be transmitted (step B6; Yes), the reproduction control unit 22 instructs the control signal transmission unit 23 to transmit the track mark signal T (step B7). The control signal transmission unit 23 transmits the track mark signal T to the recording device 3 via the control signal line 6. In the example of the recording control signal shown in FIG. 5, a track mark signal T having a predetermined time width is transmitted at a low voltage level. Then, the reproduction control unit 22 instructs the acoustic signal reproduction unit 24 to reproduce the next song (step B4).

  The recording device 3 monitors the control signal while recording (coding the received acoustic signal and recording it in the acoustic signal storage unit 34) (step C4). Recording continues while the signal R during playback continues (Step C5; No, Step C7; No, Step C9; Yes).

  When the track mark signal T is received (step C5; Yes), the recording control unit 32 performs track switching (step C6). That is, when the recording medium is an MD or the like, a track mark is recorded. When the recording medium is an HDD or the like, the recorded file is closed and a new file is created. Next, the encoder 33 is instructed to start the next recording (step C4). The encoding unit 33 encodes the acoustic signal received from the acoustic signal lines 5L and 5R and records it in the newly created file in the acoustic signal storage unit 34. The fact that the track switching is performed in the recording device 3 by transmitting the track mark signal T from the sound reproducing device 2 is indicated by a wavy arrow from step B7 to the front of step C5 in FIG.

  In the sound reproduction device 2, when the reproduction of the music being reproduced is notified from the sound signal reproduction unit 24 and there is no next music selected (step B6; No, step B8; Yes), reproduction control is performed. The unit 22 instructs the acoustic signal reproduction unit 24 to stop transmission of the acoustic signal (step B9). Next, it is determined whether or not to continue the recording folder (step B10). When the folder is not continued (step B10; No), the reproduction control unit 22 instructs the control signal transmission unit 23 to transmit the recording stop signal S (step B11). Whether the folder is continued (step B10; Yes) or not, the control signal transmission unit 23 is instructed to stop the reproducing signal R (step B12).

  In the recording device 3, when the control signal receiving unit 31 notifies the recording control unit 32 that the recording stop signal S has been detected (step C7; Yes), the recording control unit 32 performs a recording stop process (step C8). . The recording control unit 32 instructs the encoding unit 33 to stop recording and closes the recorded file. The encoding unit 33 stops the encoding of the acoustic signal and the recording to the acoustic signal storage unit 34. Then, the created series of files are combined into one folder. The fact that the recording stop process is performed in the recording device 3 by transmitting the recording stop signal S from the sound reproducing device 2 is indicated by a wavy arrow from step B11 to step C7 in FIG. When the recording stop signal S is detected, the recording device 3 may end recording in the folder and close the folder.

  In the recording device 3, when the reproducing signal R stops without detecting the recording stop signal S (step C9; No), it is checked whether or not there is a connection signal C (step C10). If there is a connection signal C (step C10; Yes), the recording control unit 32 performs a recording stop process (step C11). The recording control unit 32 instructs the encoding unit 33 to stop recording and closes the recorded file. The encoding unit 33 stops the encoding of the acoustic signal and the recording to the acoustic signal storage unit 34. In this case, since the folder is continued as described in step B10, a new folder is not created by making the next song file the same folder.

  When the playback signal R stops and the connection signal C is not detected (step C10; No), it is determined that the communication cable 4 has been disconnected from the sound playback device 2 or the recording device 3. In that case, the recording control unit 32 instructs the encoding unit 33 to stop recording, and deletes the recording for a predetermined time (step C12). Since an unnecessary acoustic signal is recorded in time from when the signal R being reproduced is stopped until it is detected, the unnecessary acoustic signal is deleted. Then, the recorded file is closed.

  In step C12, the created series of files may be combined into one folder, or the last recorded file may be deleted and recording may be performed again from that song. Moreover, you may make a user select those processes.

  In the second embodiment, a recording stop signal S is transmitted from the sound reproducing device 2 to the recording device 3 at the end of the reproduction of a series of songs. When the reproducing signal R is stopped and the connection signal C is not detected, it can be determined that the communication cable 4 has been disconnected. In that case, unnecessary recordings for the time required to detect that the signal R being reproduced and the connection signal C are stopped are retroactively erased. As a result, unnecessary sounds are not heard when the recorded music is played back. It is also possible to erase only the song that was being played when the signal R being played was stopped and start recording again from that song. By examining the track marks recorded so far, it is easy to know which song has been recorded normally and from which song it should be re-recorded.

  In the second embodiment, whether or not the communication cable 4 is connected can be determined based on the presence or absence of the connection signal C. Therefore, the recording stop signal S is used as a folder creation command, and it can be considered that the folder is continued when the recording stop signal S is absent and the playback signal R stops (becomes the connection signal C). As a result, it is possible to select a piece of music that is continuously played back by the sound playback device 2 and is recorded synchronously.

  Further, the connection signal C can be used as a recording standby signal. That is, when there is a connection signal C, the recording standby is performed, and when there is no connection signal C, the recording is completely stopped. In recording standby, for example, the recording medium can be rotated and recording can be started quickly. In the complete stop state, for example, the rotation of the recording medium can be stopped to reduce power consumption.

  In Embodiment 2, since the recording control signal is transmitted while being superimposed on the acoustic signal, the number of core wires of the communication cable 4 can be reduced. For example, the structure of a normal stereo cable currently available on the market can be used.

  In the configuration of the audio system 1 of FIG. 4, the recording control signal is superimposed on the right channel acoustic signal line 5R, but the recording control signal may be superimposed on the left channel acoustic signal line 5L. Further, the recording control signals may be divided and superimposed on the left channel and right channel acoustic signal lines 5L and 5R, respectively. When superimposing the recording control signal on one acoustic signal line, the signal superimposing unit 25 and the signal separating unit 35 each need only one circuit. When the recording control signal is divided and superimposed on the two acoustic signal lines 5L and 5R, the signal superimposing unit 25 and the signal separating unit 35 each have two circuits, but the number of voltage levels to be superimposed or separated can be reduced.

  In addition, the hardware configuration and the flowchart described above are merely examples, and can be arbitrarily changed and modified.

  The audio system 1 can be realized using a normal computer system without depending on a dedicated system. For example, a computer program for executing the above operation is stored and distributed on a computer-readable recording medium (flexible disk, CD-ROM, DVD-ROM, etc.), and the computer program is installed in the computer. Thus, the audio system 1 that executes the above-described processing may be configured. Further, the audio system 1 of the present invention may be configured by storing the computer program in a storage device included in a server device on a communication network such as the Internet and downloading it by a normal computer system.

  When each of the above functions is realized by sharing an OS (operating system) and an application program, or by cooperation between the OS and the application program, only the application program part is stored in a recording medium or a storage device. Also good.

  It is also possible to superimpose the above computer program on a carrier wave and distribute it via a communication network.

It is a block diagram which shows the example of a structure of the audio system which concerns on Embodiment 1 of this invention. It is a figure which shows the example of the recording control signal of the audio system which concerns on Embodiment 1 of this invention. 5 is a flowchart showing an example of an audio system operation according to Embodiment 1 of the present invention. It is a block diagram which shows the example of a structure of the audio system which concerns on Embodiment 2 of this invention. It is a figure which shows the example of the recording control signal of the audio system which concerns on Embodiment 2 of this invention. It is a flowchart which shows an example of operation | movement of the audio system which concerns on Embodiment 2 of this invention.

Explanation of symbols

1 Audio system
2 Sound playback device
3 Recording device
4 Communication cable 5L, 5R Acoustic signal line
6 Control signal line
7 GND
21 External input section
22 Playback control unit
23 Control signal transmitter
24 Sound signal reproduction part
25 Signal superimposing section
31 Control signal receiver
32 Recording controller
33 Encoding unit
34 Acoustic signal storage
35 Signal separator
36 Input section
C Connection signal
R Playback signal
S Recording stop signal
T Track mark signal

Claims (5)

The sound reproducing device and the recording device are connected via a detachable communication cable, and the sound signal transmitted from the sound reproducing device to the recording device via the communication cable is recorded by the recording device. An audio system for recording on a medium,
The sound reproduction device includes a control signal supply means for supplying a connection signal indicating that the communication cable is connected to the recording device, which is a control signal independent of the sound signal,
The recording device is
Control signal detecting means for detecting the presence or absence of the connection signal;
Recording control means for controlling recording of the acoustic signal on the predetermined recording medium according to the presence or absence of the connection signal detected by the control signal detection means;
With
The recording control means stops recording the acoustic signal on the predetermined recording medium when the connection signal is not detected;
An audio system characterized by that. The control signal supply means includes
When the connection signal is not detected, after the recording of the acoustic signal to the predetermined recording medium is stopped, the recorded sound for a predetermined time from the position where the recording to the predetermined recording medium is stopped The audio system of claim 1, wherein the signal is retroactively erased.   The audio system according to claim 1, wherein the control signal supply unit supplies the connection signal to the recording device using a signal line different from a line for transmitting the acoustic signal of the communication cable.   The control signal supply means superimposes the connection signal on the acoustic signal and supplies the connection signal to the recording device using at least one of the lines for transmitting the acoustic signal of the communication cable. The audio system according to claim 1 or 2. The sound reproduction device and the recording device are connected via a detachable communication cable, and the sound signal transmitted from the sound reproduction device to the recording device via the communication cable is recorded by the recording device. A recording control method in an audio system for recording on a medium,
The sound reproducing device includes a step of supplying a connection signal indicating that the communication cable is connected to the recording device, which is a control signal independent of the sound signal,
The recording device is
A control signal detection step for detecting the presence or absence of the connection signal;
And a step of stopping recording of the acoustic signal on the predetermined recording medium when the connection signal is not detected.

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