JP2004056309A - Recording and reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording and reproducing apparatus for automatically discriminating whether an input apparatus is connected or an output apparatus is connected to a signal input output terminal used in common in an excellent way. <P>SOLUTION: In the recording and reproducing apparatus provided with an external signal input function such as a microphone and an external signal output function such as a headphone wherein a plug 2 of the input apparatus 3 and the output apparatus 4 is plugged into the signal input output terminal 1 used in common, when the plug 2 of the input apparatus 3 or the output apparatus 4 is plugged into the signal input output terminal 1 used in common, a DC current is applied between a signal electrode 2a and a ground electrode 2b of the plug 2 and a voltage between the signal electrode 2a and the ground electrode 2b of the plug 2 is measured to detect the resistance between the signal electrode 2a and the ground electrode 2b of the plug 2, and whether the input apparatus 3 or the output apparatus 4 is connected to the signal input output terminal 1 used in common is discriminated depending on the detected resistance value. <P>COPYRIGHT: (C)2004,JPO

Description

【００４４】
即ち、この録音、再生装置が録音モードであり、信号入出力端子１にプラグ２が挿入接続されており、このプラグ２が出力装置４であると判別したときには、この信号入出力端子１は出力機能となり、切換回路１８は内蔵マイクロホン１９を選択する。
【００４５】
この録音・再生装置が録音モードであり、信号入出力端子１に挿入接続されているプラグ２が入力装置３であると判別したときは、この信号入出力端子１は入力機能となり、切換回路１８は外部マイクロホンを選択する。
【００４６】
また、この録音・再生装置が録音モードで信号入出力端子１にプラグが挿入されていないときには、信号入出力端子１は使用せず、切換回路１８は内蔵マイクロホン１９を選択する。
【００４７】
この録音・再生装置が再生モードであり、信号入出力端子１に挿入接続されているプラグ２が出力装置４であると判別したときは、この信号入出力端子１は出力機能とされ、切換回路１８は不動作となり、マイクロホンは選択しない。
【００４８】
この録音・再生装置が再生モードであり、信号入出力端子１に挿入接続されているプラグ２が出力装置４であると判別したときは、この信号入出力端子１は出力機能とされ、切換回路１８は不動作となり、マイクロホンは選択されない。
【００４９】
また、この録音・再生装置が再生モードであり、信号入出力端子１にプラグが挿入されていないときには、信号入出力端子１は使用せず、切換回路１８も不動作であり、マイクロホンは選択されない。
【００５０】
斯る図４例においても図１例同様の作用効果が得られることは容易に理解できよう。
【００５１】
尚、本発明は、上述例に限ることなく、本発明の要旨を逸脱することなく、その他種々の構成が採り得ることは勿論である。
【００５２】
【発明の効果】
【００５３】
斯る本例によれば共通で使用する信号入出力端子に入力装置あるいは出力装置のプラグが挿入接続されたときにプラグの信号電極と接地電極との間の抵抗値を検出し、この抵抗値により良好に自動判別できるので、入力端子及び出力端子を共通にでき、この録音・再生装置の小型化が実現できる。
【００５４】
特に昨今では記録メディアの小型化により録音・再生装置自体の小型化が大きな課題となっており、大きな配置体積を必要とする接続端子の個数を削減することは、録音・再生装置の小型化の上で大きなメリットがある。
【００５５】
また、この接続端子の個数を削減するのに、録音・再生装置の状態により入出力を切り換えたり、切換スイッチを設け、人為的に入出力を切り換えたりすることが考えられるが、録音・再生装置の状態のみで切り換えた場合、誤動作や致命的な制限事項があり、切換スイッチで切り換える場合、切り換え忘れによる録音機会を逸したりする問題があるが、本発明によれば自動検出を使用するので、録音機会を逸することがなく、誤動作や致命的な制限事項もほとんど無くすことが可能になる等、使用者の不利益を軽減できる。
【図面の簡単な説明】
【図１】
本発明録音・再生装置の実施の形態の要部の例を示す構成図である。
【図２】
プラグの例を示す構成図である。
【図３】
本発明の説明に供するフローチャートである。
【図４】
本発明録音・再生装置の実施の形態の要部の具体的例を示す構成図である。
【符号の説明】
１‥‥信号入出力端子、１ａ‥‥信号端子、１ｂ‥‥接地端子、１ｃ‥‥検出端子、２‥‥プラグ、２ａ‥‥信号電極、２ｂ‥‥接地電極、３‥‥入力装置、４‥‥出力装置、５‥‥切換スイッチ、６，７‥‥増幅回路、８‥‥マイクロコントローラ、９，１０，１３，１５，１６‥‥抵抗器、１１‥‥判別回路、１２‥‥接続スイッチ、Ｖｃｃ，＋Ｂ‥‥電源端子[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a signal input function from the outside such as a microphone and a signal output function to the outside such as a headphone, and inserts and connects plugs of an input device and an output device to a signal input / output terminal commonly used. Recording / playback device.
[0002]
Problems to be solved by the prior art and the invention
2. Description of the Related Art Conventionally, in a recording / playback device having a function of inputting an external signal such as a microphone and a function of outputting a signal to an external device such as a headphone, a plug between a plug of an input device such as a microphone and a plug of an output device such as headphones. Even when the shape is the same, the plugs of the input device and the output device are provided with separate signal input terminals and signal output terminals, respectively, due to their different functions.
[0003]
In a recording / reproducing apparatus provided with two terminals, such as a signal input terminal and a signal output terminal, in particular, a portable recording / reproducing apparatus, the size of the recording / reproducing apparatus is limited by the installation location of the two terminals. Was inconvenient.
[0004]
Therefore, it has been considered to provide a signal input / output terminal for commonly using the signal input terminal and the signal output terminal in the recording / reproducing apparatus. Or play function.
[0005]
In this case, there is a problem that recording cannot be performed when an output device such as headphones is connected to the signal input / output terminal, or reproduction cannot be performed when an input device such as a microphone is connected. Was.
[0006]
Further, in this recording / reproducing apparatus, a signal input / output terminal which uses the signal input terminal and the signal output terminal in common is provided, and a switch is provided. In some cases, the playback device is switched between an input function and an output function.
[0007]
In this case, the switching of the switch or the like is sometimes forgotten, and when the switching is forgotten, there is an inconvenience that a recording opportunity is missed and the usability is poor.
[0008]
In view of the above, it is an object of the present invention to enable automatic determination of whether an input device or an output device is connected to a commonly used signal input / output terminal. .
[0009]
[Means for Solving the Problems]
The recording / reproducing apparatus of the present invention has an external signal input function such as a microphone and an external signal output function such as a headphone, and can insert and connect plugs of an input apparatus and an output apparatus to a signal input / output terminal commonly used. In such a recording / reproducing apparatus, when a plug of the input device or the output device is inserted and connected to the commonly used signal input / output terminal, a direct current is applied between the signal electrode of the plug and the ground electrode. The voltage between the signal electrode and the ground electrode of the plug is measured, and the resistance between the signal electrode and the ground electrode of the plug is detected. It is determined whether an input device or an output device is connected to the signal input / output terminal used in step (1).
[0010]
According to the present invention, when a plug of an input device or an output device is inserted and connected to a commonly used signal input / output terminal, a resistance value between a signal electrode and a ground electrode of the plug is detected. The resistance value can be determined satisfactorily by the resistance value (input device is several hundred Ω, output device is several tens Ω).
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an embodiment of a recording / reproducing apparatus of the present invention will be described with reference to the drawings.
[0012]
In FIG. 1, reference numeral 1 denotes a signal input / output terminal provided in a recording / reproducing apparatus. The signal input / output terminal 1 is configured such that a monaural plug 2 as shown in FIG. 2A is inserted and connected. The signal terminal 1a to which the signal electrode 2a connected to the signal line of the plug 2 is connected, the ground terminal 1b to which the ground electrode 2b to which the ground line of the plug 2 is connected, and the ground electrode 2b are connected. And a detection terminal 1c.
[0013]
In this case, a monaural plug 2 as shown in FIG. 2A is used as a plug of an input device 3 such as a microphone and an output device 4 such as headphones connected to a signal input / output terminal 1 of the recording / reproducing device. It is assumed that
[0014]
In the example of FIG. 1, the signal terminal 1a of the signal input / output terminal 1 is connected to the changeover switch 5 movable contact 5a. The first fixed contact 5b of the changeover switch 5 is connected to a signal input circuit (not shown) of the recording / reproducing apparatus via the amplifier circuit 6, and the second fixed contact 5c of the changeover switch 5 is connected to the amplifier 7 To the signal output circuit (not shown) of the recording / reproducing apparatus, and the third fixed contact 5d of the changeover switch 5 is electrically floated.
[0015]
The movable contact 5a of the changeover switch 5 is controlled by a microcontroller 8, which will be described later.
[0016]
The ground terminal 1b of the signal input / output terminal 1 is grounded, and the detection terminal 1c of the signal input / output terminal 1 is connected to a first power supply terminal Vcc via a series circuit of resistors 9 and 10. When the plug 2 is inserted and connected to the signal input / output terminal 1, the detection terminal 1c is grounded. Therefore, a predetermined insertion detection signal for detecting the insertion connection of the plug 2 at the connection point between the resistors 9 and 10. (Predetermined voltage) is obtained, and in this example, the insertion detection signal is supplied to the discrimination circuit 11, and the discrimination circuit 11 informs the microcontroller 8 that the plug 2 has been inserted and connected to the signal input / output terminal 1. input.
[0017]
Also, the second power supply terminal + B is connected to the signal terminal 1a of the signal input / output terminal 1 via the connection switch 12 and the resistor 13 whose on / off is controlled by the microcontroller 8. In this case, when a plug 2 of an input device 3 such as a microphone is inserted and connected to the signal input / output terminal 1, a resistance R1 between the signal electrode 2a and the ground electrode 2b of the plug 2 is connected to the signal terminal 1a, for example, several hundred ohms. When the plug 2 of the output device 4 such as a headphone is inserted and connected to the signal input / output terminal 1, the signal electrode 2a of the plug 2 and the ground are connected to the signal input / output terminal 1. A second voltage V2 corresponding to a resistance value R2 between the electrodes 2b, for example, several tens of ohms is obtained.
[0018]
The voltage obtained at the signal terminal 1a is supplied to one input terminal of the voltage comparison circuit 14. A connection point between the connection switch 12 and the resistor 13 is grounded via a series circuit of resistors 15 and 16 for voltage division. In this case, a reference voltage VR intermediate between the first voltage V1 and the second voltage V2 is obtained at the connection point between the resistors 15 and 16.
V1>VR> V2
[0019]
The reference voltage VR obtained at the connection point between the resistors 15 and 16 is supplied to the other input terminal of the voltage comparison circuit 14. The output signal of the voltage comparison circuit 14 is supplied to a discrimination circuit 11, which discriminates whether the input device 3 or the output device 4 is connected to the signal input / output terminal 1, The result of this determination is input to the microcontroller 8.
[0020]
Further, the operating power is supplied from the first power supply terminal Vcc to the microcontroller 8, the discriminating circuit 11, the voltage comparing circuit 14, and the like. The other components of the recording / reproducing apparatus according to this embodiment are the same as those of the conventional apparatus.
[0021]
This embodiment is configured as described above, and the recording / reproducing apparatus of FIG. 1 is operated by the microcontroller 8 as shown in the flowchart of FIG. That is, first, it is checked whether or not the plug 2 has been inserted into the signal input / output terminal 1 (step S1), and it is determined whether or not the plug 2 has been inserted (step S2). When the plug 2 is not inserted into the input / output terminal 1, the process is terminated, the plug 2 is inserted into the signal input / output terminal 1, and an insertion detection signal is supplied to the discrimination circuit 11, from which the plug 2 insertion detection is input. At this time, the microcontroller 8 connects the movable contact 5a of the changeover switch 5 to the third fixed contact 5d (step S3), and makes the movable contact 5a electrically float.
[0022]
At this time, the connection switch 12 is turned on by the microcontroller 8, and a DC current flows between the signal electrode 2a and the ground electrode 2b of the plug 2 from the second power supply + B via the resistor 13.
[0023]
At this time, depending on whether the plug 2 inserted and connected to the signal input / output terminal 1 is the input device 3 or the output device 4, the voltage obtained at the signal electrode 2a is the first voltage V1 or the second voltage V1 corresponding to the equivalent resistance value. The voltage V2 is compared with the reference voltage VR by the voltage comparison circuit 14, and the determination circuit 11 determines whether the input device 3 or the output device 4 is based on the output signal of the voltage comparison circuit 14. (Step S5), the result of this determination is input to the microcontroller 8.
[0024]
Next, it is determined whether the recording / reproducing apparatus is in the recording mode or the reproducing mode (step S6).
At this time, when the recording / reproducing apparatus is in the reproducing mode, the microcontroller 8 turns off the connection switch 12 (step S7), and thereafter connects the movable contact 5a of the changeover switch 5 to the second fixed contact 5c to record. Output the playback signal of the playback device to the output device 4 such as headphones; In this case, since it is not determined whether the signal input / output terminal 1 is connected to an input device or an output device, there is no inconvenience even if the active speaker dubbing cable is determined to be an input device.
[0025]
When the recording / playback device is in the recording mode, it is determined whether the input device 3 or the output device 4 is connected to the signal input / output terminal 1 (step S9), and the input device 3 such as a microphone is determined. If so, the movable contact 5a of the changeover switch 5 is connected to the first fixed contact 5b (step S10), and an audio signal from the input device 3 such as the microphone is recorded.
[0026]
In this case, the connection switch 12 is kept turned on, and the power from the second power supply terminal + B is supplied to the input device 3 such as a microphone via the signal terminal 1a.
[0027]
If it is determined in step S9 that the output device 4 is connected to the signal input / output terminal 1, the connection switch 12 is turned off (step S11) and the movable contact 5a of the changeover switch 5 is set to the second position. Connect to fixed contact 5c. In this case, a monitor sound at the time of recording with the built-in microphone or the like of the recording / reproducing apparatus can be output.
[0028]
According to the present embodiment, when the plug 2 of the input device 3 or the output device 4 is inserted and connected to the signal input / output terminal 1 that is commonly used, the resistance value between the signal electrode 2a of the plug 2 and the ground electrode 2b. Can be detected and automatically determined satisfactorily based on the resistance value. Therefore, the input terminal and the output terminal can be shared, and the size of the recording / reproducing apparatus can be reduced.
[0029]
In particular, in recent years, the downsizing of recording / reproducing devices themselves has become a major issue due to the downsizing of recording media, and reducing the number of connection terminals that require a large layout volume is an important factor in reducing the size of recording / reproducing devices. There is a big advantage on the above.
[0030]
In order to reduce the number of connection terminals, it is conceivable to switch input / output according to the state of the recording / reproducing device, or to provide a changeover switch to artificially switch the input / output. When switching only in the state of, there is a malfunction or fatal limitation, and when switching with the switch, there is a problem of missing the recording opportunity due to forgetting to switch, but according to this example, since automatic detection is used, It is possible to reduce the disadvantages of the user, for example, without losing the opportunity for recording, eliminating malfunctions and fatal restrictions.
[0031]
FIG. 4 shows a more specific example of FIG. In describing FIG. 4, portions corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0032]
The signal input / output terminal 1 in the example of FIG. 4 is also adapted to insert and connect a stereo plug 2 as shown in FIG. 2B of an output device 4 such as a headphone. The signal terminals 1a and 1d to which the two signal electrodes 2a and 2c connected to the wire are connected, the ground terminal 1b to which the ground electrode 2b to which the ground wire of the plug 2 is connected, and the ground electrode 2b And a detection terminal 1c to be connected.
[0033]
In this case, the plug 2 of the input device 3 such as a microphone is a monaural plug 2 as in the example of FIG. 1 and is inserted and connected to the signal input / output terminal 1 as in the example of FIG.
[0034]
The left and right signal terminals 1a and 1d of the signal input / output terminal 1 are respectively connected to the left and right amplifying circuits 7L and 7R of the signal output circuit via field effect transistors 17L and 17R constituting switches for turning on / off a signal output line. To the output side.
[0035]
The signal terminal 1a is connected to an input side of a microphone amplifier circuit 6 constituting a signal input circuit via a switching circuit 18 for switching between an output signal of a built-in microphone and an external input signal.
[0036]
In FIG. 4, reference numeral 19 denotes a built-in microphone. The output signal of the built-in microphone 19 is supplied to the input side of the microphone amplifier circuit 6 through the switching circuit 18. The switching circuit 18 performs switching control of the microphone selection circuit 20 in accordance with a command from the microcontroller 8.
[0037]
The ground terminal 1b of the signal input / output terminal 1 is grounded, and the detection terminal 1c of the signal input / output terminal 1 is connected to a first power supply terminal Vcc via a series circuit of resistors 9 and 10, and An insertion detection signal obtained when the plug 2 is inserted and connected at the midpoint of the connection between 9 and 10 is supplied to the microcontroller 8 also serving as a discrimination circuit.
[0038]
In accordance with a command from the microcontroller 8, the audio IC power supply 22 supplies power to the audio IC 21 so that the second power supply is obtained on the + B power supply line when power is supplied to the audio IC 21. This + B power supply line is connected to the signal terminal 1a of the signal input / output terminal 1 via the field effect transistor 23 constituting a switch.
[0039]
Further, this signal terminal 1a is connected to the non-inverting input terminal + of the operational amplifier circuit constituting the voltage comparison circuit 14, and the reference voltage VR obtained at the connection point between the resistors 15 and 16 is inverted. Connect to input terminal-. The discrimination signal obtained at the output side of the operational amplifier circuit is supplied to the microcontroller 8.
[0040]
The output side of the voltage comparison circuit 14 is grounded via a field effect transistor 24 forming a switch.
In this case, the headphone control circuit 25 turns on the field effect transistors 17L, 17R and 24 and turns off the field effect transistor 23 when the output device 4 such as headphones is connected to the signal input / output terminal 1 in accordance with a command from the microcontroller 8. When the input device 3 such as a microphone is connected to the signal input / output terminal 1, the field effect transistors 17L, 17R and 24 are turned off and the field effect transistor 23 is turned on.
[0041]
Reference numeral 26 denotes a mute circuit connected between the respective output sides of the left and right amplifying circuits 7L and 7R. The mute circuit 26 serves to mute an external output when a built-in speaker (not shown) is used. The circuit 26 is controlled by the headphone mute control circuit 27 in accordance with a command from the microcontroller 8.
[0042]
In the example of FIG. 4, the operation can be performed as shown in Table 1.
[0043]
[Table 1]

[0044]
That is, when the recording / reproducing apparatus is in the recording mode, the plug 2 is inserted and connected to the signal input / output terminal 1, and it is determined that the plug 2 is the output device 4, the signal input / output terminal 1 outputs the signal. Function, and the switching circuit 18 selects the built-in microphone 19.
[0045]
When the recording / reproducing apparatus is in the recording mode and it is determined that the plug 2 inserted and connected to the signal input / output terminal 1 is the input device 3, the signal input / output terminal 1 becomes an input function and the switching circuit 18 Selects an external microphone.
[0046]
When the recording / reproducing apparatus is in the recording mode and no plug is inserted into the signal input / output terminal 1, the signal input / output terminal 1 is not used, and the switching circuit 18 selects the built-in microphone 19.
[0047]
When the recording / reproducing apparatus is in the reproducing mode and it is determined that the plug 2 inserted and connected to the signal input / output terminal 1 is the output device 4, the signal input / output terminal 1 is set to an output function and the switching circuit 18 is inactive and no microphone is selected.
[0048]
When the recording / reproducing apparatus is in the reproducing mode and it is determined that the plug 2 inserted and connected to the signal input / output terminal 1 is the output device 4, the signal input / output terminal 1 is set to an output function and the switching circuit 18 is inactive and no microphone is selected.
[0049]
When the recording / reproducing apparatus is in the reproducing mode and the plug is not inserted into the signal input / output terminal 1, the signal input / output terminal 1 is not used, the switching circuit 18 is inoperative, and the microphone is not selected. .
[0050]
It can be easily understood that the same operation and effect as in FIG. 1 can be obtained in the example of FIG.
[0051]
It is to be noted that the present invention is not limited to the above-described example, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.
[0052]
【The invention's effect】
[0053]
According to this embodiment, when a plug of an input device or an output device is inserted and connected to a signal input / output terminal commonly used, a resistance value between a signal electrode of the plug and a ground electrode is detected, and the resistance value is determined. , The input terminal and the output terminal can be shared, and the size of the recording / reproducing apparatus can be reduced.
[0054]
In particular, in recent years, the downsizing of recording / reproducing devices themselves has become a major issue due to the downsizing of recording media, and reducing the number of connection terminals that require a large layout volume is an important factor in reducing the size of recording / reproducing devices. There is a big advantage on the above.
[0055]
In order to reduce the number of connection terminals, it is conceivable to switch input / output according to the state of the recording / reproducing device, or to provide a changeover switch to artificially switch the input / output. In the case of switching only in the state of, there is a malfunction or fatal limitation, and when switching with the switch, there is a problem that the recording opportunity is lost due to forgetting to switch, but according to the present invention, since automatic detection is used, It is possible to reduce the disadvantages of the user, for example, without losing the opportunity for recording, eliminating malfunctions and fatal restrictions.
[Brief description of the drawings]
FIG.
1 is a configuration diagram illustrating an example of a main part of an embodiment of a recording / reproducing apparatus of the present invention.
FIG. 2
It is a block diagram showing an example of a plug.
FIG. 3
5 is a flowchart for explaining the present invention.
FIG. 4
1 is a configuration diagram illustrating a specific example of a main part of an embodiment of a recording / reproducing apparatus of the present invention.
[Explanation of symbols]
1 signal input / output terminal, 1a signal terminal, 1b ground terminal, 1c detection terminal, 2 plug, 2a signal electrode, 2b ground electrode, 3 input device, 4 {Output device, 5} changeover switch, 6,7} amplifying circuit, 8} microcontroller, 9, 10, 13, 15, 16} resistor, 11} discriminating circuit, 12} connection switch , Vcc, + B power supply terminal

Claims (2)

A recording / reproducing device which has a function of inputting signals from the outside such as a microphone and a function of outputting signals to the outside such as headphones, and is capable of inserting and connecting plugs of an input device and an output device to commonly used signal input / output terminals. At
When a plug of the input device or the output device is inserted and connected to the commonly used signal input / output terminal, a direct current is applied between a signal electrode of the plug and a ground electrode, and A voltage between the signal electrode and the ground electrode is measured to detect a resistance value between the signal electrode and the ground electrode of the plug, and the detected resistance value is input to the signal input / output terminal commonly used. A recording / reproducing device characterized in that it is determined whether a device is connected or an output device is connected. The recording / reproducing apparatus according to claim 1,
A recording / reproducing apparatus characterized in that it is determined whether the signal input / output terminal functions as an input or an output according to a result of the determination and information on a recording state or a reproduction state.

Images