JP4736712B2 - Audio system, sound reproduction apparatus, and sound reproduction control method - Google Patents

Description

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

  Music recorded on a medium such as a record, CD (compact disc), music recorded from a radio broadcast, or music downloaded via the Internet, a magnetic disc such as a mini disc player (hereinafter referred to as MD) or a hard disk It is recorded on a portable memory player equipped with a device, a flash memory, etc., and personally listened at various places.

  When recording from a sound reproducing device such as a CD player to a recording device such as a portable memory player, a sound signal may be input to the recording device by connecting a communication cable to the headphone terminal of the sound reproducing device. In recent years, sound reproducing apparatuses have become smaller and dedicated external output terminals (LINE OUT and AUX terminals) are often not provided (see, for example, Patent Document 1). In many cases, the sound output of a personal computer is only a headphone terminal.

Normally, in a sound reproduction device, when a headphone jack is inserted into a headphone terminal, the speaker relay is disconnected (see, for example, Patent Document 2 or Patent Document 3). When the speaker relay is cut off, no sound is output from the speaker connected to the sound reproducing device, and the recorded sound may not be monitored during recording in a portable memory player or the like. Further, even if monitoring during recording is possible, if no sound is output from the sound reproduction apparatus when recording is not being performed, it is not possible to determine from which point recording is to be started. When a sound signal is taken out from the headphone terminal of the sound reproducing device and recorded by another recording device, the reproduced sound cannot be monitored in many cases.
JP 2001-332076 A JP 2005-045477 A JP-A-6-113393

The present invention has been made in view of the above circumstances, and an audio system , a sound reproduction device, and a sound reproduction control method capable of monitoring reproduced sound even when sound signal data is output from a headphone terminal of the sound reproduction device to a recording device. The purpose is to provide.

In order to achieve the above object, an audio system according to the first aspect of the present invention provides:
A sound reproducing apparatus and the recording apparatus are connected through a universal communication cable removal, it transmits an acoustic signal to the recording device from the previous SL audio reproduction device via the communication cable, a predetermined recording by said recording device An audio system for recording on a medium,
The recording apparatus comprises a connection signal supply means for supplying to said sound reproducing apparatus through the communication cable connection signal indicating that the recording device is connected before Symbol sound reproducing apparatus,
The sound reproducing device is
A headphone terminal to which the communication cable is connected;
And speaker terminals speaker is Ru is connected,
Connection signal detecting means for detecting the connection signal;
Speaker connection control means for outputting the acoustic signal to both the headphone terminal and the speaker terminal when a connection signal is detected by the connection signal detection means;
It is characterized by providing.

Preferably, the sound reproducing apparatus, the front comprises a Ruoto amount adjusting means to adjust the output volume of the Kion Hibiki signal,
When the connection signal is detected by the connection signal detecting means, before Kion amount adjustment means of the acoustic signal output to both the speaker terminal and the headphone terminal is outputted to the speaker terminal and adjusting only the volume of the sound signal.

  Further, the connection signal supply means supplies the connection signal to the sound reproduction device using a signal line different from a line for transmitting the sound signal of the communication cable.

Alternatively, the connection signal supply means supplies the connection signal to the sound reproduction device using at least one of the lines for transmitting the sound signal of the communication cable.
The sound reproducing device according to the second aspect of the present invention is
A headphone terminal and a speaker terminal;
A recording device for recording an acoustic signal coming from a sound reproduction device via a communication cable and outputting a connection signal indicating that the sound reproduction device is connected to the communication cable is connected to the headphone terminal. Connection signal detection means for detecting the connection signal when connected via a cable;
Speaker connection control means for outputting the acoustic signal to both the headphone terminal and the speaker terminal when the connection signal is detected by the connection signal detection means;
Is provided.
Preferably, a volume adjusting means for adjusting the output volume of the acoustic signal is provided,
When the connection signal is detected by the connection signal detection means, the sound volume adjustment means is output to the speaker terminal among the acoustic signals output to both the headphone terminal and the speaker terminal. Only the volume of the acoustic signal is adjusted.

Sound reproduction control method according to a third aspect of the present invention, a sound reproduction device having a headphone jack and a speaker terminal, recording device and are connected via a communication cable, via the communication cable from the previous SL sound reproducing apparatus the acoustic signal transmitted to the recording device and, a sound reproduction control method in an audio system for recording on a predetermined recording medium by said recording device,
When the recording device is connected to the headphone terminal,
The recording device comprises the step of providing a connection signal indicating that該録sound device is connected before Symbol audio reproducing apparatus to the sound reproducing apparatus,
The sound reproducing device is
Detecting the connection signal;
Outputting the acoustic signal to both the headphone terminal and the speaker terminal when the connection signal is detected;
Comprising
It is characterized by that.

  According to the audio system of the present invention, the reproduced sound can be monitored even when an acoustic signal is output from the headphone terminal of the acoustic reproducing device to the recording device. As a result, the sound signal to be recorded can be properly recorded without making a mistake.

(Embodiment 1)
Embodiment 1 of an audio system according to the present invention will be described with reference to FIG. 1 and FIG. 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 connection signal reception unit 23, a selector 24, a headphone amplifier 25, and a speaker amplifier 26. The external input unit 21 includes a key switch, a touch panel, or the like. When the user operates the key switch or the like, the reproduction control unit 22 is instructed to select a piece of music to be reproduced and to reproduce an acoustic signal of the selected piece of music. Tell. Also, the volume of the speaker described later is adjusted.

  The reproduction control unit 22 instructs the selector 24 to reproduce and stop the acoustic signal in accordance with a command input from the external input unit 21. The reproduction control unit 22 instructs the selector 24 to output an acoustic signal to the headphone amplifier 25 and / or the speaker amplifier 26 depending on the presence / absence of a connection signal described later and whether a headphone jack is inserted.

  The connection signal receiving unit 23 receives a connection signal (described later) sent via the communication cable 4 and notifies the reproduction control unit 22 of the connection signal.

  The selector 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 playback device thereof. The selector 24 reproduces the acoustic signal recorded on these media according to the instruction of the reproduction control unit 22 and outputs the acoustic signal simultaneously to the headphone amplifier 25 or the speaker amplifier 26 or both the headphone amplifier 25 and the speaker amplifier 26. The selector 24 may also select an audio signal from an external sound source and output it to a speaker or headphones.

  The headphone amplifier 25 amplifies the acoustic signal input from the selector 24 to power that can drive a headphone (not shown), and outputs the amplified power to the headphone terminal 25T. Then, the acoustic signal is transmitted to the recording device 3 via the communication cable 4 connected to the headphone terminal 25T. When listening to music from the sound reproducing device 2 with headphones, the headphones are connected to the headphone terminal 25T.

  The speaker amplifier 26 amplifies the acoustic signal input from the selector 24 to power that can drive a speaker (not shown), and outputs the amplified power to the speaker terminal 26T. The sound reproducing device 2 may include a speaker (not shown). The speaker is a separate device and may be connected to the sound reproduction device 2 by a speaker cable. When the speaker is built in the sound reproduction device 2, the speaker terminal 26 </ b> T is a connection point between the built-in speaker and the speaker amplifier 26 and is inside the sound reproduction device 2. Although one speaker terminal 26T is shown in FIG. 1, in the case of stereo reproduction, the output is divided into left and right channels. In some cases, acoustic signals are separated and output to a large number of speakers in order to realize the surround effect.

  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 connection signal receiving unit 23, and the selector 24 can be configured by a DSP (Digital Signal Processor).

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

  For example, the connection signal transmission unit 31 sends a connection signal represented by a constant voltage to the GND 7 described later to the connection signal line 6.

  In accordance with the control signal input from the external input unit 36, the recording control unit 32 starts recording, stops recording, records a track mark or creates a file, creates a folder, etc. The 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 communicated from the headphone terminal 25T of the sound reproducing device 2 is usually an analog audio signal.

  The acoustic signal storage unit 34 includes a recording medium such as an HDD, a flash memory, or an MD, and a driving 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 external input unit 36 includes a key switch, a touch panel, or the like. When the user operates the key switch or the like, the recording control unit 32 gives commands such as recording start, recording stop, track mark recording, or file creation. To tell.

  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 connection signal transmission unit 31, and the encoding unit 33 can be configured by a DSP (Digital Signal Processor).

  The communication cable 4 is configured as a single cable including the acoustic signal lines 5L and 5R, the connection signal line 6, and the GND 7. The acoustic signal lines 5L and 5R transmit the left channel acoustic signal and the right channel acoustic signal, respectively. The connection signal line 6 is connected to the connection signal transmission unit 31 and the connection signal reception unit 23, and transmits a connection signal converted to a DC level, for example. The GND 7 determines the reference of the potential of signals (acoustic signals and connection signals) 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.

  In the example of the present embodiment, the connection signal is represented by the potential with respect to the GND 7 of the connection signal line 6. When a headphone is connected to the headphone terminal 25T, it is determined that there is no connection signal line 6 in the cable for connecting the headphone and that the connection signal line 6 is open and there is no connection signal.

  In the example of the present embodiment, the connection signal is set to a positive voltage level with respect to the GND 7, for example. However, the connection signal is not limited to a positive DC voltage. For example, the connection signal may be a negative voltage or an AC voltage.

  The connection 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, a tone signal having a certain frequency or a combination of a plurality of frequencies can be used. Alternatively, the control signal line 6 and GND 7 may be connected via a resistor on the recording device 3 side, and a connection signal may be formed by forming a loop circuit of the control signal line 6 and GND 7. The formation of the loop circuit can be detected by a current flowing on the sound reproduction device 2 side.

  Next, the operation of the audio system 1 according to Embodiment 1 will be described. FIG. 2 is a flowchart showing an example of the operation of the audio system 1 according to the first embodiment. The recording control on the left side of FIG. In the right side of FIG.

  The recording control unit 32 detects when the recording device 3 is turned on or when the communication cable 4 is connected, and sends a connection signal from the connection signal transmission unit 31 to the connection signal line 6 of the communication cable 4. Send out (step R1). Then, a recording process is performed according to the user's operation input from the external input unit 36 (step R2).

  On the other hand, in the sound reproduction device 2, the reproduction control unit 22 detects that the communication cable 4 is connected to the headphone terminal 25T (step P1). For example, when a switch (not shown) provided in the headphone terminal 25T is operated by a jack of the communication cable, it can be detected that the communication cable 4 (or headphone cable) is connected. When the communication cable 4 or the headphone cable is connected to the headphone terminal 25T (step P2; Yes), it is detected whether there is a connection signal (step P3).

  When the connection signal is not detected by the connection signal receiving unit 23 and the reproduction control unit 22 is notified that there is no connection signal (step P4; No), the reproduction control unit 22 sends an acoustic signal to the selector 24 to the headphone amplifier 25. Instructs not to output to the speaker amplifier 26 (step P5). As a result, the acoustic signal is not output to the speaker terminal 26T, and music is not reproduced from the speaker. The acoustic signal is output to the headphone terminal 25T, and music can be listened to through the headphones.

  When the connection signal is detected by the connection signal receiving unit 23 and the reproduction control unit 22 is notified that there is a connection signal (step P4; Yes), the reproduction control unit 22 sends the acoustic signal to the selector 24 and the headphone amplifier 25 and the speaker. The amplifier 26 is instructed to output (step P6). The acoustic signal is output to both the headphone terminal 25T and the speaker terminal 26T. As a result, the sound signal can be recorded by the recording device 3 while listening to music through the speaker.

  When neither the communication cable 4 nor the headphones are connected to the headphone terminal 25T (step P2; No), the reproduction control unit 22 outputs an acoustic signal to the speaker amplifier 26 to the selector 24 and outputs to the headphone amplifier 25. It is instructed not to do so (step P7). The acoustic signal is output to the speaker terminal 26T, and music played through the speaker can be heard.

  Here, step P7 may be the same operation as step P6. That is, an acoustic signal may be output to the headphone amplifier 25 even when a communication cable or headphones are not connected to the headphone terminal 25T. Simply, the output of the headphone terminal 25T is not used.

  When the headphone amplifier 25 and the speaker amplifier 26 are one circuit, or when the headphone amplifier 25 and the speaker amplifier 26 differ only in the final output stage, the output to the speaker terminal 26T is turned on / off by a relay (speaker relay). By doing so, the same action can be performed. That is, in Step P5, the speaker relay is turned off so that the acoustic signal is not output to the speaker terminal 26T. In Step P6 (and Step P7), the speaker relay is turned on so that the acoustic signal is output to the speaker terminal 26T.

  As described above, according to the audio system 1 of the present invention, the reproduced sound can be monitored even when the sound signal is dubbed to the recording device 3 from the headphone terminal 25T of the sound reproducing device 2. As a result, the sound signal to be recorded can be properly recorded without making a mistake.

(Embodiment 2)
Next, the case where the headphone amplifier 25 and the speaker amplifier 26 are respectively provided with volume control units 25V and 26V will be described with reference to FIG. As shown in FIG. 3, the headphone amplifier 25 of the sound reproducing device 2 includes a volume control unit 25V, and the speaker amplifier 26 includes a volume control unit 26V. The volume adjusters 25V and 26V can adjust the respective volumes by changing the gain of the amplifier with the command voltage, for example. Volume adjustment is performed by operating a switch of the external input unit 21.

  When neither the communication cable 4 nor the headphones are connected to the headphone terminal 25T (step P2 in FIG. 2; No), the reproduction control unit 22 adjusts the volume of the acoustic signal output to the speaker terminal 26T by the volume adjustment operation. To the selector 24 (step P7). At the same time, the volume of the acoustic signal output to the headphone terminal 25T may be adjusted. As a result, the music reproduced from the speaker is adjusted by the user's operation.

  When a headphone is connected to the headphone terminal 25T (step P2 in FIG. 2; Yes) and a connection signal is not detected (step P4 in FIG. 2; No), the playback control unit 22 operates the headphone terminal 25T by adjusting the volume. The selector 24 is instructed to adjust the volume of the acoustic signal output to (step P5). As a result, the music reproduced from the headphones is adjusted by the user's operation.

  When the communication cable 4 is connected to the headphone terminal 25T (step P2 in FIG. 2; Yes) and a connection signal is detected (step P4 in FIG. 2; Yes), the reproduction control unit 22 performs the volume adjustment operation, Although the volume of the acoustic signal output to the speaker terminal 26T is adjusted, the selector 24 is instructed not to change the volume of the acoustic signal output to the headphone terminal 25T. The amplification degree of the headphone amplifier 25 is fixed at a standard level optimum for recording. The monitor sound reproduced from the speaker is adjusted by a user operation, but the recording level does not change. As a result, even if the monitor sound is adjusted to the user's preference, the recording level can be kept constant and a uniform recording can be obtained.

(Embodiment 3)
Next, Embodiment 3 in the case of transmitting a recording control signal superimposed on an acoustic signal will be described with reference to FIG. 4 and FIG.

  FIG. 4 is a block diagram showing an example of the configuration of the audio system 1 according to the third 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 separating unit 27, and the recording device 3 is provided with a signal superimposing unit 35.

  In the recording device 3, the signal transmitted from the connection signal transmitting unit 31 is superimposed on one of the acoustic signals by the signal superimposing unit 35. In the example of FIG. 4, the connection signal is superimposed on the right channel acoustic signal line 5R and transmitted. In the sound reproduction device 2, the connection signal is separated from the sound signal by the signal separation unit 27 and input to the connection signal reception unit 23.

  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 connection signal is superimposed, the acoustic signal is not affected. Further, the signal separation unit 27 can separate the DC component and take it out as a connection signal.

  Even when the acoustic signal is transmitted as a digital signal, the connection 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 illustrating an example of a connection signal of the audio system 1 according to the third embodiment. FIG. 5 schematically illustrates a state in which the acoustic signal A is superimposed on the connection signal C. Even if the acoustic signal A is superimposed on the connection signal C or the like, it can be separated, and the acoustic signal A and the connection signal C are independent.

  The third embodiment is the same as the first or second embodiment in operation except that the recording control signal is superimposed on the acoustic signal.

  In the third embodiment, since the recording control signal is transmitted while being superimposed on the acoustic signal, the core wire 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 in FIG. 4, the connection signal is superimposed on the right-channel acoustic signal line 5 </ b> R, but the connection signal may be superimposed on the left-channel acoustic signal line 5 </ b> L.

  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 sound reproducing device 2 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. 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 block diagram which shows the example of a structure of the audio system which concerns on Embodiment 3 of this invention. It is a figure which shows the example of the connection signal of the audio system which concerns on Embodiment 3 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 Connection signal line
7 GND
21 External input section
22 Playback control unit
23 Connection signal receiver
24 selector
25 Headphone amplifier 25V Volume control unit 25T Headphone jack
26 Speaker amplifier 26V Volume control unit 26T Speaker terminal
27 Signal separator
31 Connection signal transmitter
32 Recording controller
33 Encoding unit
34 Acoustic signal storage
35 Signal superposition part
36 External input section
C Connection signal

Claims (7)

A sound reproducing apparatus and the recording apparatus are connected through a universal communication cable removal, it transmits an acoustic signal to the recording device from the previous SL audio reproduction device via the communication cable, a predetermined recording by said recording device An audio system for recording on a medium,
The recording apparatus comprises a connection signal supply means for supplying to said sound reproducing apparatus through the communication cable connection signal indicating that the recording device is connected before Symbol sound reproducing apparatus,
The sound reproducing device is
A headphone terminal to which the communication cable is connected;
And speaker terminals speaker is Ru is connected,
Connection signal detecting means for detecting the connection signal;
Speaker connection control means for outputting the acoustic signal to both the headphone terminal and the speaker terminal when a connection signal is detected by the connection signal detection means;
An audio system comprising: The sound reproducing apparatus, the front comprises a Ruoto amount adjusting means to adjust the output volume of the Kion Hibiki signal,
When the connection signal is detected by the connection signal detecting means, before Kion amount adjustment means of the acoustic signal output to both the speaker terminal and the headphone terminal is outputted to the speaker terminal audio system according to claim 1, characterized in that adjusting only the volume of the sound signal.   The audio system according to claim 1, wherein the connection signal supply unit supplies the connection signal to the sound reproduction device using a signal line different from a line for transmitting the sound signal of the communication cable.   2. The audio system according to claim 1, wherein the connection signal supply unit supplies the connection signal to the sound reproduction device using at least one of the lines for transmitting the sound signal of the communication cable.   A headphone terminal and a speaker terminal;
  A recording device for recording an acoustic signal coming from a sound reproduction device via a communication cable and outputting a connection signal indicating that the sound reproduction device is connected to the communication cable is connected to the headphone terminal. Connection signal detection means for detecting the connection signal when connected via a cable;
  Speaker connection control means for outputting the acoustic signal to both the headphone terminal and the speaker terminal when the connection signal is detected by the connection signal detection means;
A sound reproducing device comprising:   Volume adjustment means for adjusting the output volume of the acoustic signal,
  When the connection signal is detected by the connection signal detection means, the sound volume adjustment means is output to the speaker terminal among the acoustic signals output to both the headphone terminal and the speaker terminal. 6. The sound reproducing apparatus according to claim 5, wherein only the volume of the sound signal is adjusted. A sound reproduction device having a headphone jack and a speaker terminal, recording device and are connected via a communication cable, an acoustic signal transmitted from the previous SL audio reproducing apparatus to the recording apparatus via said communication cable and the recording A sound reproduction control method in an audio system for recording on a predetermined recording medium in an apparatus,
When the recording device is connected to the headphone terminal,
The recording device comprises the step of providing a connection signal indicating that該録sound device is connected before Symbol audio reproducing apparatus to the sound reproducing apparatus,
The sound reproducing device is
Detecting the connection signal;
Outputting the acoustic signal to both the headphone terminal and the speaker terminal when the connection signal is detected;
A sound reproduction control method comprising:

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