JP2001266563A - Audio device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an audio device which detects a connection state of a device main body with an earphone and can perform the prescribed processing in accordance with a connection state in a compact audio device. SOLUTION: This audio device is provided with a signal generating circuit (D/A converter 110), a first terminal 205a to which an audio signal outputted from this signal generating circuit is supplied, a device main body 200 having a second terminal 205c to which reference voltage is supplied, an electric/ acoustic conversion device (earphone 600) having first and second connection terminals removably connected to the first and the second terminals. A connection state between the first and the second terminal is detected while an audio signal line Li connecting the signal generating circuit and the first terminal 205a is cut off, and when it is non-connection, the prescribed operation is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an audio device, and more particularly, to an audio device that detects a connection state between an earphone and a device main body and executes and controls a process according to the connection state.

[0002]

2. Description of the Related Art Conventionally, there is a portable audio device. This type of portable audio device has a built-in storage medium such as a CD, MD, cassette tape, or semiconductor memory, and has a built-in playback unit that plays back music data stored in the storage medium. An earphone or a headphone (hereinafter, referred to as an earphone or the like) that converts an audio signal transmitted from the apparatus main body into sound and outputs the sound.

Usually, an earphone or the like is detachable from the main body of the apparatus. An output jack for outputting an audio signal is provided on the main body of the apparatus. To an earphone or the like, and emits a sound based on the audio signal. For this reason, if the plug of the earphone or the like is disconnected from the output jack for some reason, or if the user intentionally removes the plug, music cannot be heard.

On the other hand, there is an audio device that automatically shuts off the power when an earphone or the like is disconnected from an output jack (Japanese Utility Model Laid-Open No. 60-57237). In this type of audio equipment,
Insulating movable plate for plug insertion detection that moves so as to be in contact with or non-contact with the electrode according to the attachment / detachment of the plug in order to detect that the plug of the earphone etc. is inserted into the jack part of the audio equipment to connect the earphone etc. Is provided near the plug insertion hole, and this is used as a power switch. When the plug is removed, the power is cut off by bringing the insulated movable plate into contact with the electrode to stop the reproduction of music.

[0005]

However, in the above-described audio equipment, a mechanism for detecting a connection state with the earphone or shutting off the power supply is mechanically provided. That is, the insulating movable plate for plug insertion detection is provided with a plug insertion hole. It is difficult to reduce the size of the device because it needs to be provided nearby.

[0006] In order to bring a connection plug of a well-known standard into contact with a special small contact provided on an audio apparatus main body, a detachable adapter may be interposed between an earphone or the like and the apparatus main body. It is desired that this adapter be further miniaturized in accordance with the miniaturization of the apparatus main body and the portability of the device be improved.

When the apparatus main body and the earphone are connected via the adapter as described above, it is necessary to detect both the connection state between the apparatus main body and the connection adapter and the connection state between the connection adapter and the earphone or the like. . When a detection mechanism such as the above-described acoustic device is applied, an insulating movable plate must be provided both in the audio device main body and in the adapter. Can not be converted.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a more compact audio device capable of detecting a connection state between the device main body and an earphone and executing a predetermined process according to the connection state. It is.

[0009]

The present invention has the following features in order to achieve the above object. In addition,
In the following description of the means, a configuration corresponding to the embodiment will be exemplified by parentheses as an example. Reference numerals and the like are reference numerals and the like in the drawings described later.

According to the first aspect of the present invention, a signal generating circuit for generating and outputting an audio signal (for example, FIGS. 5 and 6)
And a first terminal (for example, an output terminal "OUT2-R" 205a shown in FIG. 6) to which an audio signal output from the signal generation circuit is supplied.
And a second terminal (for example, an output terminal “GND2” 205c shown in FIG. 6) to which a reference voltage is supplied (for example, a main unit 200 shown in FIGS. 1, 3, and 4).
And first and second connection terminals detachably connected to the first and second terminals (for example, FIG. 1, FIG. 3, and FIG. 4).
And a stereo pin plug 601 shown in FIG. 1 (for example, an earphone 600 shown in FIGS. 1, 4, and 5), the signal generating circuit and the first terminal are connected to each other. A disconnecting means (for example, transistor 14 shown in FIG. 6, FIGS. 5 and 6)
And a detecting means (the controller 108) for detecting the connection state between the first and second terminals when the signal generating circuit and the first terminal are disconnected by the disconnecting means. For example, the detection circuit 11 shown in FIGS.
1, controller 108 and CPU 101; S in FIG.
23 to S24, S36 to S37), and when the detection means detects that the first and second terminals are not connected,
Processing executing means for executing a predetermined operation (for example, CPU 101 shown in FIG. 5; S25 to S28, S38 to S4 in FIG. 7)
1).

According to the first aspect of the present invention, a signal generation circuit for generating and outputting an audio signal, a first terminal to which the audio signal output from the signal generation circuit is supplied, and a reference voltage An audio device comprising: a device main body having a supplied second terminal; and an electroacoustic transducer having first and second connection terminals detachably connected to the first and second terminals. , The cutoff means cuts off between the signal generation circuit and the first terminal, and the detection means sets off the first signal when the signal generation circuit is cut off from the first terminal. And a connection state between the first and second terminals, and the processing execution means executes a predetermined operation when it is detected that the first and second terminals are not connected.

Therefore, the connection state of the electroacoustic transducer can be detected, and a predetermined process can be automatically performed according to the connection state. Useless current consumption such as audio signal generation when the electroacoustic transducer is not connected can be eliminated, and the battery life can be extended. Further, since no mechanical structure is required as the detecting means, the size of the audio device can be reduced.

Here, as in the second aspect of the present invention, in the first aspect of the present invention, the detecting means generates the signal by the cutoff means when no audio signal is generated in the signal generating circuit. The connection between the circuit and the first terminal may be cut off to detect the connection state (for example, S22 in FIG. 7; N → S23 to S24).

According to a third aspect of the present invention, in the first aspect of the present invention, the detecting means is configured to connect the signal generating circuit to the signal generating circuit by the interrupting means before the signal generating circuit starts generating an audio signal. The connection with the first terminal is cut off to detect the connection state (for example, S in FIG. 7).
35; N → S36 to S37).

According to the second or third aspect of the present invention, when the audio signal is not generated in the signal generation circuit or before the generation of the audio signal is detected, the connection state is detected. The connection status of the earphone can be detected periodically, such as before or between songs. As a result, even in the case where a plurality of music pieces are continuously reproduced, the reproduction can be automatically stopped between the music pieces in accordance with the connection state of the earphone.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the processing executing means is configured to execute the processing when the detecting means detects that the first and second terminals are disconnected. It is characterized in that the generation of the audio signal in the signal generation circuit is stopped (for example, S26 and S39 in FIG. 7).

According to the fourth aspect of the present invention, when the first and second terminals are not connected, that is, when the electroacoustic transducer is not connected to the apparatus main body, the audio signal of the signal generation circuit is not generated. Since the generation is stopped, unnecessary current consumption is eliminated, and the battery life can be extended.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the processing executing means is configured to execute the processing when the detecting means detects that the first and second terminals are disconnected. , May be notified (for example, S49 in FIG. 7).

According to the fifth aspect of the present invention, when the electroacoustic transducer is not connected to the apparatus main body, the fact is notified by a warning display, an alarm sound, or the like.
The user can be made aware of the disconnection.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the processing execution means is provided when the detection means detects that the first and second terminals are not connected. The operation of the external operation switch means operated to start or stop the generation of the audio signal in the signal generation circuit is prohibited (for example, S28 in FIG. 7,
S41) You may make it.

According to the sixth aspect of the present invention, when the electroacoustic transducer is not connected to the apparatus main body, no external instruction operation for audio reproduction or stop is accepted, so that the electroacoustic transducer can be connected. It is possible to prevent useless battery consumption such as audio reproduction due to erroneous operation of a switch when carrying an audio device without carrying it.

According to a seventh aspect of the present invention, in the first aspect of the invention, the first and second connection terminals of the electroacoustic transducer are adapters (eg, FIG. , FIG. 3, and FIG. 4 are connected to the first and second terminals via an earphone connection adapter 500).

According to the present invention, not only the disconnection state caused by the removal of the adapter from the apparatus main body but also the adapter is attached to the apparatus main body by the blocking means and the detecting means provided in the apparatus main body. Although it is possible to detect a disconnected state caused by removing the electroacoustic transducer from the adapter, it is not necessary to separately provide a detecting means for the adapter and the apparatus main body. As a result, the device main body and the adapter can be reduced in size, which is suitable for a more miniaturized audio device.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an audio device according to the present invention will be described below in detail with reference to the drawings.

First, the configuration will be described. FIG. 1 is a schematic configuration diagram showing the overall appearance of a list-type music playback device 100 as an embodiment of an audio device according to the present invention.
FIG. 3 is a schematic diagram illustrating the configuration of the display unit 103 and the key unit 102 of the list-type music playback device 100. FIG. 3 is a diagram illustrating the connection between the main unit 200 of the list-type music playback device 100, the earphone connection adapter 500, and the earphone 600. It is an enlarged view of a partial section of a part. FIG. 4 shows a list-type music playback device 100.
FIG. 9 is a circuit diagram illustrating a connection state between a headset and an earphone connection adapter 500 and an earphone 600. FIG. 5 is a block diagram showing a main configuration of the list-type music playback device 100. FIG.
Is a detection circuit 111 for detecting the connection state of the earphone 600
This is an example of the configuration.

The list-type music reproducing apparatus 100 is a fixed, portable semiconductor storage medium (hereinafter, referred to as a semiconductor memory 107) having a built-in recording medium such as a nonvolatile semiconductor storage element such as a flash memory. Alternatively, it is detachably provided and has a reproducing function of reproducing music based on, for example, music data in the MP3 format stored in the semiconductor memory 107, and also functions as a wristwatch for displaying clock information such as date and time.

As shown in FIG. 1, a wrist-type music player 100 has a substantially rectangular parallelepiped main body 200 and a main body 2.
00 is attached to a user's body (for example, a wrist, an upper arm, or the like).
01 and 302. ) And each wristband 301, 3
02 buckles 401 and 4 for detachably connecting 02
02, an earphone connection adapter 500 detachably attached to one side of the main body 200, and an earphone 600.

The mode key 10 is provided on the surface of the main body 200.
2a, a key unit 102 including a volume control key 102b and a play / stop operation key 102c, and a display unit 103 for displaying a current time, a song number (track number), song information, a song playback time, and the like.

Play / stop operation key 102 of key section 102
As shown in FIG. 2, c includes a play / stop switch SW2 operated when instructing reproduction or stop, a previous music switch SW1 operated when selecting the previous music, and a reproduction / stop switch SW1 operated when selecting the next music. The next song switch SW3 to be operated is included.

The key section 102 receives a press signal of each key from the CPU.
Output to 101. There are two types of key operations: a normal pressing operation in which a key is pressed for a short time shorter than a predetermined time, and an operation in which a key is continuously pressed for a predetermined time or more (for example, 2 seconds or more). Different instructions can be entered.

As shown in FIG.
A display area 103a and a second display area 103b are provided, and display data output from the CPU 101 is displayed on each of the display areas 103a and 103b.

The first display area 103a is, for example, 6 × 7.
It has a dot display area, and in the player mode described below, among the song information of the song to be played, “Song name”, “Singer name”,
And about 30 letters and numbers of "Album Name" are sequentially displayed one by one. Subsequently, the character image and the animation image associated with the music may be sequentially displayed one by one.

The first display area 103a is further divided to form a display area having a size of about 6 dots in a vertical direction and 1 dot in a horizontal direction adjacent to both ends, and a glyco pattern (frame dot pattern) is formed in this display area. Etc. may be sequentially displayed according to the music.

The second display area 103b displays the track number and play time of the music being reproduced in the player mode, and displays the current time in the player operation disable mode of the clock mode. In addition, by a special operation (pressing and holding the mode key 102a for a predetermined time or more), the mode can be switched to the clock operable mode during the player mode, and the current time can be displayed during the music reproduction.

An external device connection connector portion 204 is provided on the other side of the main body portion 200. The external device such as a personal computer (PC) can transmit data transmitted through a connection attachment (not shown) from a list type music reproducing device. Enter 100. The data to be transmitted is the semiconductor memory 1
07 is written.

On one side surface of the main body 200, a fixed hook concave portion 200a engaging with the fixed hook 507 of the earphone connection adapter 500 and a movable hook concave portion 200b engaging with the movable hook 508 are provided. (See FIG. 3). The fixed hook concave portion 200a and the movable hook concave portion 200b are also used when the main body 200 is fixed to the above-described external device connection adapter.

Here, the connection state between the main body 200 and the earphone connection adapter 500 will be described with reference to FIG. As shown in FIG. 3, the earphone connection adapter 500 is a substantially rectangular parallelepiped casing 501 including an upper casing 502 made of synthetic resin and a lower casing 503 made of synthetic resin.
And an earphone 60 provided on one end surface of the casing 501.
A stereo pin jack 504 that inserts and holds the stereo pin plug 601 of the first case and an upper casing 502
The circuit board 505 held inside the casing 501 by being sandwiched between the lower casing 503 and the lower casing 503, and the circuit board 505 protrudes from a plurality of holes 503 b provided on the lower surface of the lower casing 503 in three rows. A plurality of pin-shaped connection terminals 506a, 506b, 506c, a fixed hook 507 provided on one end side of the lower surface of the lower casing 503, a movable hook 508 provided rotatably on the other end surface of the lower casing, and a movable hook It is roughly constituted by a torsion coil spring 509 (spring member) sandwiched between 508 and the other end surface of the casing 501.

The earphone connection adapter 500 is connected to the main body 20.
0, the fixing hook 507 is engaged with the concave portion 200a of the main body 200, and then the entire earphone connection adapter 500 is connected to the main body 200 using the fixing hook 507 as a fulcrum.
And the movable hook 508 is fitted into the concave portion 200b. After the insertion, the movable hook 508 is turned by the urging force of the torsion coil spring 509 into the recess 200b.
And the earphone connection adapter 500 is fixed to the main body 200 together with the fixing hook 507.

In this fixing, the connection terminals 506a,
506b and 506c are output terminals 205a, 205b, and 205 of the earphone connector 205 of the main body 200, respectively.
After being in contact with c, each coil spring 506d is pushed in while contracting. That is, each connection terminal 506a,
The output terminals 205a, 205b, and 205c of the earphone connector 205 are electrically connected to the output terminals 205a, 205b, and 205c with an appropriate contact pressure due to the repulsive force of the coil spring 506d.

As a result, each output terminal 205a, 20a provided in the earphone connection connector 205 of the main body 200
5b, 205c and the stereo pin plug 601 of the earphone 600 are connected to the connection terminal 5 of the earphone connection adapter 500.
06a, 506b, 506c, each coil spring 50
6d, circuit board 505, and stereo pin jack 50
4 will be connected.

The earphone 600 is a well-known earphone that converts an audio signal generated and output in a D / A converter 110 (to be described in detail later) provided in the main body 200 into sound and outputs the sound. A standard stereo pin plug 601 that is inserted into the stereo pin jack 504 of the main body 200 and conducts with the earphone connection connector 205 of the main body 200, and an audio signal input from the stereo pin plug 601 is transmitted to the right pad 603 and the left pad 604. An earphone cord 602 to be transmitted, a right pad 603 attached to the right ear to emit sound based on the audio right signal, and a left pad 6 attached to the left ear to emit sound based on the audio left signal.
04.

Next, referring to FIG. 4, each output terminal of the earphone connection connector 205 of the main body 200 and the earphone 60
A connection state with the “0” via the earphone connection adapter 500 will be described.

As shown in FIG. 4, a D / A converter 11 for generating and outputting an audio signal is provided in the main body 200.
0 (details will be described later) is provided. The D / A converter 110 outputs an audio right signal “OUT-
An "R" terminal, an "OUT-L" terminal for outputting an audio left signal, and a "GND" terminal for supplying a reference voltage are provided. These terminals are output terminals 205a, 205b, 205c of the earphone connection connector unit 205. That is, the output terminals 205a and 205b (first terminals) are electrically connected to the "OUT-R" terminal and the "OUT-L" terminal, respectively, to supply the right and left audio signals. The output terminal 205c (second terminal) is electrically connected to the "GND" terminal, and is supplied with a reference voltage.

Then, the earphone connection adapter 500
Are attached to the earphone connection connector unit 205, the connection terminals 5 provided on the earphone connection adapter 500 are provided.
06a, 506b, and 506c are provided in the main body 200, respectively.
With the output terminals 205a, 205b, 205c.
The connection terminals 506a, 506b, and 506c provided on the earphone connection adapter 500 are connected to the coil spring 506 in the earphone connection adapter 500 as described above.
It is electrically connected to the stereo pin plug 601 of the earphone 600 inserted into the stereo pin jack 504 via the terminal d and the circuit board 505.

The stereo pin plug 601 is
0 to the output terminal 205a of the D / A converter 11
0 is supplied to the right pad 603 via the earphone cord 602 while being output from the "OUT-L" terminal of the main unit 200 while being supplied from the "OUT-L" terminal. The left audio signal is supplied to the left pad 604 of the earphone 600 via the earphone cord 602. Also, the output terminal 205 of the main body 200
c, the reference voltage output from the “GND” terminal of the D / A converter 110 is supplied to the left and right pads 603 and 604 of the earphone 600 via the earphone cord 602.

Therefore, when the earphone 600 is connected, the audio output terminals 205a and 205b of the earphone connector 205 are connected to the earphone 6 respectively.
It is electrically connected to the reference voltage output terminal 205c via the diaphragm driving coils 603a and 604a in the internal portion 00.

On the other hand, when the wrist-type music playback device 100 is used only as a timepiece, the earphone connection adapter 500 can be detached from the main body 200 with one touch by the following procedure. That is, the movable hook 508 is pushed out of the recess 200b of the main body 200, and the fixed hook 50
After rotating in a direction away from the main body 200 around the fulcrum 7, the fixing hook 507 is removed from the recess 200a.
At this time, the connection terminal 5 in the earphone connection adapter 500
06a, 506b and 506c are detached from the main body 200, so that the output terminals 205a, 205
b and 205c are released.

Next, with reference to FIG. 5, the internal structure of the wrist-type music playback device 100 will be described. As shown in FIG. 5, the list-type music playback device 100 includes a CPU 101, a key unit 102, a display unit 103, a clock unit 104, a RAM 10
5, ROM 106, semiconductor memory 107, controller 108, decoder IC 109, D / A converter 11
0, the detection circuit 111 is provided inside the main body 200, and is connected to the earphone 600.

The CPU 101 controls the execution of the operation according to the mode based on the key operation signal supplied from the mode key 102a of the key section 102, so that the list-type music playback device is operated in accordance with the system program and the application program stored in the ROM 106. Centralized control of each part of 100.

The executable modes include a player mode for reproducing music and a clock mode for displaying the current time. The clock mode further includes a player inoperable mode in which the time and day of the week are displayed and music playback operation is not accepted,
There is a player operable mode in which the time is displayed while music is being played.

In the player mode, the CPU 101
Is the reproduction of music according to the reproduction process (see FIG. 7) described later,
It displays song information (song name, singer name, album name, play time, track number, etc.) and displays images (character images, glyco patterns, etc.). That is, the key unit 10
The music data and the music information stored in the semiconductor memory 107 are read out according to the reproduction instruction input from the reproduction / stop operation key 102 c of the second and the RAM 105 and secured in the RAM 105.
At this time, the character images may be read simultaneously.

The CPU 101 also selects music data selected according to the music selection operation by the play / stop operation key 102c,
Alternatively, the controller reads out music data of a song determined in accordance with a playback method set by operating the mode key 102a (for example, a playback method such as "shuffle playback" for playing in random order, or "loop playback" for repeating playback), and a controller. The reproduction start request is output to 108. In response to the reproduction start request, the controller 108 passes the music data to the decoder IC 109 and the D / A converter 110 to generate an audio signal and reproduce the music. When the reproduction of the music ends, the controller 108 outputs a reproduction end signal to the CPU 101.

The CPU 101 detects the connection state of the earphone 600 before music playback is started or after music is completed (between songs), or while music is stopped. That is, an earphone connection detection request is sent to the controller 108, and the connection state of the earphone 600 is detected by the detection circuit 111 described below under the control of the controller 108. The detection circuit 11
When the earphone connection detection signal generated in step 1 is input, the CPU 101 determines the connection state of the earphone 600 based on the state of the earphone connection detection signal, and when it is determined that the earphone 600 is not connected, D / For example, forcibly stopping the music playback in the A-converter 110, notifying (display, alarm sound) that the earphone is not connected, entering a player operation disable mode, and the like.
Execute a predetermined process.

When the mode key 102a is pressed for a predetermined time or more, for example, two seconds or more while playing music in the player mode, the CPU 101 reads the current time from the clock unit 104 and enters the player operation enabled mode. Switch. In this mode, the second
The current time is displayed instead of the track number and the play time displayed in the display area 103b. At this time, the reproduction of music is continued, and the display state (display of music information) in the first display area 103a is continued. Also,
When the mode key 102a is pressed again for a predetermined time or more, for example, 2 seconds or more, the mode returns to the player mode, and the display content of the second display area 103b returns to the display of the track number and the play time.

Further, when it is detected that the mode key 102a is pressed for less than a predetermined period of time (for example, less than 2 seconds) in the player mode, the reproducing method may be changed. The CPU 101 reads the reproduction control information corresponding to the changed reproduction method from the ROM 106, and reproduces music according to the read reproduction control information. The playback mode includes "sequential playback (default)", which plays all songs one by one in order, "SHUFFLE", which plays songs in random order, and "all song loop", which plays all songs repeatedly in order. (All songs LOOP) "," SHUFFLE LOOP "that repeats all songs in random order," one song loop (one song LOOP) "that repeats one selected song, partially repeated "EQ" for setting an equalizer (EQ) and the like.

In the player operation disable mode in the clock mode, the CPU 101 generates display data for displaying the current time, date, and day of the week based on the time data measured by the clock section 104, and outputs the second display data of the display section 103. It is displayed in the display area 103b. Further, a clock function (correction of a clock or the like) according to an operation input from the key unit 102 is executed, and a processing result is displayed on the display unit 103.

It is also possible to shift to a communication mode for performing processing such as reading and writing data and initializing the semiconductor memory 107 in accordance with various control signals transmitted from an external device such as a PC. Further, data requested from the PC may be transmitted to the PC via an external device connection adapter (not shown).

The clock section 104 is composed of an oscillator for oscillating an electric signal of a predetermined frequency and a frequency dividing circuit for dividing the signal from the oscillator to obtain a signal of a predetermined frequency. Time. Clock information such as the measured time, date, and day of the week is sent to the clock register and sequentially updated and set.

The RAM 105 stores the semiconductor memory 107 and the R
The music data, music information, and image data read from the OM 106 are temporarily stored. Also, the list-type music playback device 10
A processing program relating to the operation of No. 0, processing results of various processes, and the like are stored.

The ROM 106 stores the list-type music player 10
0 is a fixedly provided semiconductor memory that stores a system program corresponding to 0, various application programs corresponding to the system, or various control information and various display information. A reproduction processing program described later,
Reproduction control information and the like corresponding to various reproduction modes are stored. Also, a plurality of dot animations, a plurality of glyco patterns, and the like are stored in advance.

The semiconductor memory 107 is a small and portable semiconductor storage medium having a built-in recording medium such as a nonvolatile semiconductor storage element such as a flash memory.
It stores three types of music data, music information corresponding to the music data, and image data.

The controller 108 controls the decoder IC 10
9 and the D / A converter 110 to control music reproduction,
Controls the detection of the connection status of That is, the CPU 101
When the playback start request is input from the CPU, the music data secured in the RAM 105 is sent to the decoder IC 109 and the D / A converter 110 to generate an audio signal. Also, every time the playback of one song ends, a playback end signal is
Output to PU101. Further, based on the earphone connection detection request input from the CPU 101 before the start of music reproduction or each time the music ends, the “OU” of the D / A converter 110 is
A line connecting the TR ”terminal and the audio right signal output terminal 205a of the earphone connection connector unit 205 (hereinafter, referred to as a line)
Called audio signal line L1. ) Is output as “Low”. And the audio signal line L1
Audio right signal output terminal “OUT2-
The voltage of R ″ 205a is read and output to the CPU 101 as an earphone connection detection signal.

The decoder IC 109 is constituted by a decoding circuit for decoding music data encoded by a predetermined encoding method. For example, it is constituted by an MP3 decoder, and encodes encoded music data into an AAU (Audio Access Uniform).
(t: audio decoding unit), and side information such as a frame header, bit allocation information, and scale factor is extracted for each frame, and inversely quantized based on the extracted scale factor and bit allocation information. Then, subband synthesis and L / R separation are performed, and PC
The signal is output to the D / A converter 110 as an M (Pulse Code Modulation) output signal.

The D / A converter 110 is a decoder IC1
09 is converted into an analog audio signal by a D / A conversion process, and the audio right signal and the audio left signal are respectively converted to an “OUT-R” terminal,
Output from the “OUT-L” terminal.

The detection circuit 111 is a circuit for detecting the connection state of the earphone 600, and as shown in FIG.
An inverter 13 for inverting a signal output from an "OUT" terminal of the controller 108; a signal inverted by the inverter 13 as a base signal;
The transistor 14 functioning as a switch for shutting off the signal 1 and a signal from the "OUT" terminal of the controller 108 as a base signal and connected to the output terminal "OUT2-R" 205a of the earphone connector 205 via the resistor 16. And a transistor 15 to be used. The resistance 16 has a value sufficiently larger than the internal resistance of the earphone 600. Further, the negative side of the resistor 16 (output terminal “OUT2-R” 205
a) is connected to the “IN” terminal of the controller 108.

The detection principle of the earphone connection state in the detection circuit 111 will be described in detail. During music playback, a “High” level signal is output from the “OUT” terminal of the controller 108. In this state, since the signal of the level inverted by the inverter 13 becomes the base signal of the transistor 14, the transistor 14 is turned "ON", and the output terminal "OUT2-R" 205a of the earphone connector 205 is D / D.
Conduction with the “OUT-R” terminal of the A converter 110 supplies an audio right signal. In this state, since the base signal of the transistor 15 is at the “High” level, “O”
FF ".

When detecting the connection state of the earphone 600,
That is, the controller 108 switches the signal output from the “OUT” terminal to a “Low” level signal before the start of reproduction or when music between songs is not being reproduced. Then, the transistor 14 is turned “OFF” and the transistor 1
5 is "ON".

That is, the transistor 14 is turned off.
Therefore, the audio signal line L1 connecting the "OUT-R" terminal of the D / A converter 110 and the "OUT2-R" terminal 205a of the connector 205 is cut off.
When the transistor 15 is turned “ON”, a “High” level voltage is applied to the resistor 16.

If the earphone 600 is connected to the earphone connector section 205 via the earphone connection adapter 500, the negative side of the resistor 16, ie, the output terminal "OUT2-R" 205a is connected to the diaphragm driving coil inside the earphone 600. Reference voltage output terminal "GND2" 2 via 603a
05c. Since the value of the resistor 16 is sufficiently larger than the value of the internal resistance of the earphone 600, the signal to the “IN” of the controller 108 (the output terminal “OUT2-R” 20
5a) becomes “Low”.

On the other hand, if the earphone 600 is not connected to the earphone connector section 205 (only the earphone connection adapter 500 is connected and the earphone 600 is disconnected, or both the earphone connection adapter 500 and the earphone 600 are disconnected). Since the negative side (output terminal "OUT2-R" 205a) of the resistor 16 is open, the signal to the "IN" of the controller 108 (the negative voltage of the resistor 16) becomes "High". .

When the controller 108 obtains an earphone connection detection signal (input signal to the “IN” terminal of the controller 108) with the audio signal line L 1 cut off, the controller 108 outputs the detection signal to the CPU 101. CPU1
For 01, if the input earphone connection detection signal is at the “High” level, it is determined that the earphone 600 is not connected, and if it is “Low”, it is determined that the earphone 600 is connected.

In the detection circuit 111 shown in FIG.
"OUT-R" terminal of A / A converter 110 and connector 20
5, the transistor 14 is provided so as to cut off the audio signal line L1 connecting to the "OUT2-R" terminal 205a. However, the present invention is not limited to this.
4 may be provided so as to cut off the line connecting the “OUT-L” terminal of the D / A converter 110 and the “OUT2-L” terminal 205 b of the connector 205.

Next, the operation will be described. FIG. 7 is a flowchart illustrating the operation of the list-type music playback device 100, and FIG. 8 is a diagram illustrating a display example of the display unit 103 in each mode.

A program for realizing each function described in this flowchart is stored in the ROM 106 in the form of a readable program code, and the CPU 101 sequentially executes operations according to the program code. I do. Also, the RAM 105 stores a “mode flag” indicating which mode (any one of the clock mode (player operation enabled mode), the clock mode (player operation disabled mode), and the player mode) is set, and music playback. It is assumed that various flags such as a “forced stop flag” indicating whether or not a forced stop has been set according to the current state.

First, the "mode flag" is set to the clock mode (operation disable mode), and the "forced stop flag" is set.
Is set to "0", that is, it is not during forced stop.

In this case, the CPU 101 refers to the “mode flag” and determines that the mode is the clock mode (step S
1; Y), the current time measured by the clock unit 104 is read out and displayed on the display unit 103 (step S2).
Further, it is confirmed that the operation mode is the player operation disable mode and the forced stop is not being performed (step S3; Y → step S4; N), and the day of the week is displayed on the display unit 103 (step S5).

FIG. 8A shows a display example of the display section 103 in the clock mode (player operation disabled mode). In this example, the first display area 103a displays the day of the week (FIG. 8).
(A) shows “SU”, that is, Sunday (Sunday). ) Is displayed. Also, the current time (hour, minute) “(pm) 3 (hour): 52 (minute)” and the second “18” are displayed in the second display area 103b.

In this state, the CPU 101 waits for any key input operation. If there is a key input (step S6; Y), it is confirmed that the forcible suspension flag is "0" and that the mode key 102a has been operated for a predetermined time or more (for example, 2 seconds or more). (Step S7; N → Step S8; Y → Step S
9; Y), set to player mode. That is, the "mode flag" is switched to the player mode (step S10).

When the mode is switched to the player mode, C
The PU 101 determines whether or not music is being reproduced, and if the music is stopped (step S1; N → step S11; Y),
The display unit 103 displays the number (track number) of the song currently being played back and the total time of the song (the performance time of one song) (step S12). Further, a mark indicating that the operation is stopped is displayed on the display unit 103 (step S1).
3).

FIG. 8B shows a display example of the display section 103 when the player is stopped in the player mode. In this example, a mark indicating that the display is stopped is displayed in the first display area 103a. Also, the track number “01” and the total time of the song “4 (minutes) 38 are displayed in the second display area 103b.
(Seconds) ".

Here, when the CPU 101 determines that the music reproduction has been stopped for a certain period of time (for example, one minute or more) (step S14; Y), the CPU 101 switches to the player operation disable mode of the clock mode (step S15). That is, the “mode flag” is set to the player operation disable mode, and the process returns to step S1.

If any of the previous music switch SW1 or the next music switch SW3 is input within a predetermined time while the music is stopped (step S14; N → step S16; Y)
→ Step S17; N → Step S18; N → Step S19; Y), the CPU 101 determines whether or not the music is stopped (Step S20; Y). Select a song (step S2
1).

FIG. 8C shows a display example of the display section 103 when the next music piece is selected during the stop in the player mode. In this example, a mark indicating that the display is stopped is displayed in the first display area 103a. Also, the track number “0” of the selected next song is displayed in the second display area 103b.
2 ", and the total time of the song" 4 (minutes) 25 (seconds) "are displayed.

While the music is stopped, playback /
When the stop switch SW2 is input (step S14;
N → Step S16; Y → Step S17; N → Step S18; Y), the CPU 101 determines whether or not music is being reproduced, and if not, (Step S22;
N), the process proceeds to steps S23 to S30 to execute an earphone connection detection process.

In the earphone connection detecting process, the CPU 1
01 outputs an earphone connection detection request to the controller 108. The controller 108 outputs a “Low” level signal from the “OUT” terminal to the detection circuit 111 in response to the earphone connection detection request. Then, the detection circuit 11
1, the audio signal line L1 is cut off, and the voltage of the audio output terminal "OUT2-R" 205a of the earphone connection connector unit 205 in this state is changed to "I" of the controller 108.
N ”terminal. The controller 108 uses the signal input to the“ IN ”terminal
Output to 101.

In the earphone connection detection processing, if the earphone connection detection signal is “High”, the earphone 600
Is not connected (step S25; Y), D
The music reproduction in the / A converter 110 is forcibly stopped, and the "forcible stop flag" is set to "1" (step S26). Then, a “High” signal is output from the “OUT” terminal of the controller 108 to output the audio signal line L.
1 is released (step S27), and the "mode flag" is set to the player operation disable mode of the clock mode (step S28). Then, the process returns to step S1. That is, when the earphone 600 is not connected, the mode shifts to the clock mode without receiving the reproduction stop instruction and without executing the music reproduction.

On the other hand, if the earphone connection detection signal is "Low", it is determined that the earphone 600 is connected (step S25; N), and the cutoff state of the audio signal line L1 is released, that is, the controller 108
Then, a "High" signal is output from the "OUT" terminal (step S29), and reproduction is started (step S30).

That is, the CPU 101 transfers the music data of the music selected by the music selection operation and secured in the RAM 105 to the controller 108. The controller 10
8 is output to the playback start request. Controller 10
8 is a decoder IC for music data in response to a reproduction start request.
PCM that is decompressed at 109 and output as a result
The output signal is converted into an analog audio signal in the D / A converter 110 and output from the “OUT-R” terminal and the “OUT-L” terminal. Then, the earphone connector section 20
5. Output music from the earphone 600 connected via the earphone connection adapter 500.

During music reproduction (step S31; Y), C
The PU 101 displays the number (track number) of the currently played song and the intermediate time (play time) of the song.
3 is displayed (step S32). At this time, the clock unit 1
At 04, the CPU 101 counts the middle time of the song and sequentially
Output to Also, song information such as song title, singer name, album name, etc. is read from the RAM 105 and displayed on the display unit 103 (step S33).

FIG. 8D shows a display example of the display section 103 when music is being reproduced in the player mode.
In this example, “A” is displayed in the first display area 103a, which is “A” of the song title “Automatic”, and is followed by “U” → “T” → “O” →. In this way, the song titles are sequentially switched one by one and displayed. Subsequently, the names of the singers are sequentially displayed one by one, and the album names are sequentially displayed one by one. Thereafter, a character image corresponding to the music, an animation of the character image, or the like may be sequentially displayed. Also, the track number “01” of the selected song and the intermediate time “0 (minute) 01 (second)” of the song are displayed in the second display area 103b.

If there is a key input during the reproduction of the music (step S16; Y), a process corresponding to the input operation is executed. For example, during playback of a song, the playback / stop operation key 10
If the reproduction / stop switch SW2 of 2c is pressed (Step S18; Y → Step S22; Y), the reproduction is stopped (Step S53). If the mode key 102a is operated for a certain period of time or more during the reproduction of the music (step S
17; Y → Step S44; Y), the mode is switched to the player operation enabled mode of the clock mode (Step S45; N →).
Step S46).

When entering the player operation enable mode of the clock mode, the CPU 101 displays the current time instead of the track number and the reproduction time of the music displayed on the display unit 103. At this time, while the reproduction of the music is continued, the display of the music information is also continued (Step S1; Y → Step S2 → Step S3; N → Step S47; N → Step S4).
8; Y → Step S33).

FIG. 8E shows the mode key 10 during music playback.
2A is a display example of the display unit 103 when the player mode is switched over to a player operation enabled mode of a clock mode by pressing 2a for a predetermined time or more. In this example, "A" is displayed in the first display area 103a, but this is a part of the music information. In the second display area 103b, instead of the track number “01” of the song and the play time “0 (minute) 01 (second)” of the song, the current time “(pm) 3 (hour): 52 (minute) ) 18
(Seconds) ".

When returning to the player mode, the mode key 102a is pressed again for a predetermined time or more.

Thereafter, when the music is completed and one music is completed but not all the music is completed, that is, between music (Step S34; Y → Step S35; N), the CPU
101 executes the earphone connection detection processing shown in steps S36 to S43. The flow of the earphone connection detection process is the same as that in steps S23 to S30, and thus the description is omitted.

In the earphone connection detection processing, the earphone 6
If it is determined that 00 is not connected, the reproduction of the music is forcibly stopped, the “forcible stop flag” is set to “1”, then the cutoff state of the audio signal line L1 is released, and the “mode flag” is set. Set to the player operation disable mode in the clock mode and return to step S1 (step S1).
36 → S37 → S38; Y → S39 → S40 → S4
1).

In this state, the current time is displayed on the display unit 13 and an interruption display (mark or message) indicating that the operation is forcibly stopped is displayed (step S).
1; Y → Step S2 → Step S3; Y → Step S
4: Y → Step S49).

As described above, while the music is being reproduced, the earphone 60
In the case where 0 is removed and forced stop is performed, the mode is switched to the "player operation disable mode" in which the play / stop instruction by operating the play / stop switch SW2 is not accepted.
List-type music playback device 10 without the user noticing as it is
Even if the user keeps carrying 0, music playback due to erroneous operation of the play / stop switch SW2 (eg, the switch is pressed without the user's consciousness) while carrying the device, and wasteful consumption of the battery can be prevented.

FIG. 8 (F) shows that the earphone 60
0 shows a display example of the display unit 103 when music playback is forcibly stopped after the end of the music. In this example, the first
An interruption display “x” is displayed in the display area 103a. Further, the current time “(PM) 3” is displayed in the second display area 103 b.
(Hour): 52 (minutes) 38 (seconds) ". A predetermined alarm sound may be emitted simultaneously with or instead of the interruption display. In this case, the user can be notified by sound that the earphone is disconnected.

On the other hand, if it is determined in the earphone connection detection processing that the earphone 600 is connected, the cutoff state of the audio signal line L1 is released, and the output of the next music starts (steps S36 → S37 → S38; N → S
42 → S43).

That is, the CPU 101 automatically detects the earphone connection state between songs, and if the earphone 600 is not connected, the reproduction of the song is forcibly stopped.
When 00 is connected, reproduction of the next music is performed as usual.

Thereafter, when the user notices that the user is forcibly stopped, and presses any key, the forcible stop is released. That is, if any key input is made while the interruption display is displayed on the display unit 103 in step S49, the CPU 101 updates and sets the "forced stop flag" set to "1" to "0". . And display unit 1
03 displays the day of the week instead of the interruption display (step S
49 → Step S6 → Step S7; Y → Step S5
0 → Step S51). That is, the operation enters the normal clock mode inoperable mode.

FIG. 8G shows a display example of the display section 103 when any key operation is input during the interruption display. In this example, the interruption display "x" is displayed in the first display area 103a.
"SU (meaning Sunday)" is displayed instead of. In addition, the current time “(PM) 3 (hour): 52 (minute) 38 (second)” is displayed in the second display area 103 b.

When the reproduction of all songs is completed in the player mode (step S35; Y), the CPU 101 stops the reproduction of music (step S52). At this time, if the mode key 102a is operated for a predetermined time or more (step S
16; Y → Step S17; Y → Step S44; Y →
Step S45; Y), the mode is switched to the player operation disable mode in the clock mode (step S54).

As described above, the wrist-list music reproducing apparatus 100 of the present embodiment includes the detection circuit 111 for detecting the connection state of the earphone 600 in the main body 200, before starting the reproduction of music, and between songs. While the music is stopped, the detection circuit 111 determines whether or not the earphone 600 is connected.

The detection circuit 111 includes the D / A converter 11
The transistor 14 which functions as a switch for cutting off the audio signal line L1 connecting the “OUT” terminal of the “0” to the audio output terminal 205a of the main body 200.
And detects the connection state of the earphone 600 with the audio signal line L1 cut off. The connection state of the earphone 600 is determined by the voltage value of the audio output terminal 205a with the audio signal line L1 cut off. That is, when the earphone 600 is connected, the audio output terminal 205a is connected to the reference voltage output terminal “GND2” 205c via the inside of the earphone 600, so that the audio output terminal 205a becomes “Low”. When the earphone 600 is not connected, the audio output terminal 205a is opened, so that the voltage value becomes “High”.

The CPU 101 determines the connection state of the earphone 600 detected by the detection circuit 111, and performs a predetermined operation according to the result of the determination. For example, when the earphone 600 is not connected, music playback is forcibly stopped, or the fact that the earphone 600 is not connected is notified by an interruption display or an alarm sound. If the music playback is stopped in the middle, the mode is automatically switched to the player operation disable mode in the clock mode, and the operation for switching to the player mode until the operation of continuously pressing the mode key 102a for a certain period of time or longer is input. Until an input is made, an operation related to music playback or stop is not accepted.

Therefore, it is possible to automatically detect that the earphone 600 is disconnected during the reproduction of the music or before the reproduction is started, and to automatically stop the reproduction of the music or switch to the clock mode. Therefore, useless music reproduction in a state where the earphone 600 is not connected can be eliminated, useless current consumption can be reduced, and battery life can be extended.

The main unit 200 is used as the detection circuit 111.
The connection state of the earphone 600 is detected by judging the voltage value of the audio output terminal 205a provided in the earphone connection connector unit 205, and the music is stopped by the CPU 101.
Therefore, there is no need to provide a mechanical mechanism for detecting the connection state of the earphone 600, and the size of the main body 200 can be reduced. In particular, like the list-type music playback device 100 of the present embodiment, the main unit 20
Earphone connection adapter 500 provided detachably with 0
In the case where the earphone 600 is connected via the earphone 600, the connection state of the earphone 600 via the earphone connection adapter 500 can be detected only by the detection circuit 111 provided in the main body 200 by applying the present invention. That is, the connection state between the earphone 600 and the earphone connection adapter 500 and the connection between the earphone connection adapter 500 and the main body 200
It is no longer necessary to separately detect the connection states with the device and to separately provide the detection circuit 111.

In the above embodiment, the music data recording medium is a semiconductor memory, and the MP3 format music data stored in the semiconductor memory is stored in the decoder IC.
109, the present invention is not limited to this configuration.
Or a storage medium such as an MD or a cassette tape, and a drive device or the like for reproducing music data in a format suitable for these storage media may be provided to reproduce music.

[0111] In addition, an example has been shown in which an interruption display is displayed on the display unit 103 or an alarm sound is emitted to notify that the earphone 600 is not connected. Vibration may be used to alert the user.

Also, an example in which the earphone 600 and the main body are connected via the earphone connection adapter 500 has been described. However, the earphone connection adapter 500 is omitted, and the stereo pin plug 601 of the earphone 600 is directly connected to the stereo The same effect can be obtained even when configured to be inserted into the jack 504.

[0113]

According to the first aspect of the present invention, the connection state of the electroacoustic transducer can be detected, and a predetermined process can be automatically performed according to the connection state. By performing a predetermined process such as preventing generation of an audio signal when the electroacoustic transducer is not connected, useless current consumption can be eliminated and battery life can be extended. Further, since no mechanical structure is required as the detecting means, the size of the audio device can be reduced.

According to the second or third aspect of the present invention, when the audio signal is not generated in the signal generation circuit or before the generation of the audio signal is detected, the connection state is detected. The connection state of the earphone 600 can be detected periodically, such as between music tracks. As a result, even in the case where a plurality of music pieces are continuously reproduced, the reproduction can be automatically stopped between the music pieces in accordance with the connection state of the earphone 600.

According to the fourth aspect of the present invention, when the first and second terminals are not connected, that is, when the electroacoustic transducer is not connected to the apparatus main body, the audio signal in the signal generating circuit is output. Is stopped, wasteful current consumption is eliminated, and the battery life can be extended.

According to the fifth aspect of the present invention, when the electroacoustic transducer is not connected to the apparatus main body, the fact is notified by displaying a warning or an alarm sound, so that the user is not connected. You can notice that.

According to the sixth aspect of the present invention, when the electroacoustic transducer is not connected to the apparatus main body, an external instruction operation for audio reproduction or stop is not accepted, so that the electroacoustic transducer is not connected. It is possible to prevent unnecessary battery consumption such as audio reproduction due to erroneous operation of the switch when carrying the audio device.

According to the seventh aspect of the present invention, not only the disconnection state caused by the removal of the adapter from the apparatus main body but also the adapter is attached to the apparatus main body by the blocking means and the detecting means provided in the apparatus main body. However, it is possible to detect a disconnection state caused by removing the electroacoustic transducer from the adapter, so that it is not necessary to separately provide a detecting means in the adapter and the apparatus main body. As a result, the device main body and the adapter can be reduced in size, which is suitable for a more miniaturized audio device.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an external appearance of an entire wrist-type music playback device 100 which is an embodiment of an audio device according to the present invention.

FIG. 2 is a schematic diagram illustrating a configuration of a display unit 103 and a key unit 102 of the list-type music playback device 100.

FIG. 3 is an enlarged view of a partial cross section of a connection portion between a main body 200 of the wrist-type music playback device 100, an earphone connection adapter 500, and an earphone 600.

FIG. 4 is a circuit diagram illustrating an electrical connection state between the wrist-type music playback device 100, the earphone connection adapter 500, and the earphone 600.

FIG. 5 is a block diagram showing a main configuration of the wrist-type music playback device 100.

FIG. 6 is a diagram illustrating a configuration example of a detection circuit 111 that detects a connection state of an earphone 600.

FIG. 7 is a flowchart illustrating an operation of the list-type music playback device 100.

FIG. 8 is a diagram illustrating a display example of a display unit 103 in each mode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 Wrist-type music reproducing apparatus 101 CPU 102 Key part 103 Display part 104 Clock part 105 RAM 106 ROM 107 Semiconductor memory 108 Controller 109 Decoder IC 110 D / A converter 111 Detection circuit 13 Inverter 14 Transistor 15 Transistor 16 Resistance 200 Main part 205 Earphone Connector section 205a Output terminal (audio right signal) 205b Output terminal (audio left signal) 205c Output terminal (reference voltage) 301, 302 Wristband 401, 402 Buckle 500 Earphone connection adapter 504 Stereo pin jack 506a Connection terminal 506b Connection terminal 506c Connection terminal 600 Earphone 601 Stereo pin plug

Claims (7)

[Claims] 1. A signal generating circuit for generating and outputting an audio signal, a first terminal to which an audio signal output from the signal generating circuit is supplied, and a second terminal to which a reference voltage is supplied. An audio device comprising: a device main body having: an electroacoustic transducer having first and second connection terminals detachably connected to the first and second terminals; Disconnecting means for disconnecting between the first terminal and the first terminal; and disconnecting means between the signal generating circuit and the first terminal when the disconnecting means disconnects between the signal generating circuit and the first terminal. An audio device, comprising: a detection unit for detecting a connection between the first and second terminals; and a processing execution unit for executing a predetermined operation when the detection unit detects that the first and second terminals are disconnected. . 2. The signal processing circuit according to claim 1, wherein said detecting means cuts off said signal generating circuit and said first terminal when said signal generating circuit does not generate an audio signal. The audio device according to claim 1, wherein the audio device is detected. 3. The detecting means detects the connection state by interrupting a connection between the signal generating circuit and the first terminal by the interrupting means before the signal generating circuit starts generating an audio signal. The audio device according to claim 1, wherein: 4. The method according to claim 1, wherein said processing execution means stops generation of an audio signal in said signal generation circuit when said detection means detects that the first and second terminals are not connected. The audio device according to claim 1, wherein 5. The audio processing apparatus according to claim 1, wherein when the detecting means detects that the first and second terminals are not connected, the processing executing means notifies the fact. apparatus. 6. The process execution means for starting or stopping generation of an audio signal in the signal generation circuit when the detection means detects that the first and second terminals are not connected. 2. The audio device according to claim 1, wherein the operation of the external operation switch means to be operated is prohibited. 7. The first and second connection terminals of the electroacoustic transducer are connected to the first and second terminals via an adapter detachably attached to the device main body. 2. The audio device according to claim 1, wherein