CN103974169B - Audio processing device and audio processing method - Google Patents

Abstract

The invention provides an audio processing device and an audio processing method, which are used for eliminating noise when an earphone is plugged, and the audio processing device comprises: audio jack, processing unit and switch. The audio jack includes a plurality of audio contacts. The processing unit detects whether a headset is inserted through the audio jack. The switch is coupled between one of the audio contacts and a grounding point. Wherein the processing unit turns on the switch when the processing unit detects that the earphone is inserted. When the switch is conducted for more than a preset time, the processing unit disconnects the first switch.

Description

Audio processing device and audio processing method

technical field

The present invention relates to an electronic device, and in particular to an audio processing device and an audio processing method.

Background technique

With the increasing use of mobile electronic devices such as laptops, smart phones or tablet computers, in order to play audio data without disturbing others, there are more and more opportunities to use earphones. However, when using earphones to connect with mobile electronic devices, we often encounter a situation, that is, when the earphones are plugged and unplugged, there will often be a "boo" noise from the earpiece of the earphones. With the different types of mobile electronic devices and earphones, such noises may also vary in size. When the usage situation requires, such noises will continue to appear, which may make the user unacceptable.

Contents of the invention

The invention provides an audio processing device and an audio processing method, which can eliminate the noise generated when the earphone is plugged and unplugged.

An audio processing device of the present invention is suitable for an audio processing method, comprising: an audio jack, a processing unit and a first switch. The audio jack includes multiple audio contacts. The processing unit detects whether an earphone is plugged in through the audio jack. The first switch is coupled between one of the audio contacts and a ground point. Wherein, when the processing unit detects that the earphone is inserted, the processing unit turns on the first switch; and when the first switch is turned on for more than a predetermined time, the processing unit turns off the first switch.

An audio processing method of the present invention is suitable for an audio processing device, and is used for eliminating noise caused by plugging and unplugging an earphone, comprising the following steps. Firstly, it is detected whether an earphone is plugged into an audio jack of the audio processing device. Then, when it is detected that the earphone is plugged in, a first switch of the audio processing device is turned on, wherein the first switch is coupled between an audio contact of the audio processing device and a grounding point. Next, when the first switch is turned on for more than a predetermined time, the first switch is turned off.

Based on the above, the present invention provides an audio processing device and an audio processing method, which can eliminate the noise that may be generated by the earphone receiver when it is detected that the earphone is inserted.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are illustrated in detail as follows.

Description of drawings

FIG. 1 is a schematic structural diagram of an audio processing device according to an embodiment of the present invention;

FIG. 2 is a timing diagram showing the conduction state of the first switch and the second switch and the detection voltage according to an embodiment of the present invention;

FIG. 3 is a flowchart illustrating an audio processing method according to an embodiment of the present invention.

Explanation of reference signs:

10: Audio processing device;

110: audio jack;

111-114: connection point;

120, 130: switch;

20: Connecting terminal of earphone;

GP: ground point;

LC: left channel signal;

RC: right channel signal;

GND: ground voltage;

MCR: microphone signal;

CS: control signal;

DV: detection voltage;

VDD: power supply voltage;

R1: resistance;

S301～S303: steps;

T1~T5: time interval.

detailed description

FIG. 1 is a schematic structural diagram of an audio processing device according to an embodiment of the present invention. Referring to FIG. 1 , the audio processing device 10 includes an audio jack 110 , a processing unit (not shown), a first switch 120 and a second switch 130 . The audio jack 110 is used to connect with the connecting terminal 20 of the earphone, including audio contacts 111-114. When the connecting terminal 20 of the earphone is inserted into the audio jack 110, the audio processing device 10 transmits/receives the earphone through the audio contacts 111-114 respectively. The microphone signal MCR, the ground voltage GND, the right channel signal RC and the left channel signal LC. The audio contacts 111-114 are shrapnel or other types of metal contacts.

The first switch 120 is coupled between the audio contact 114 receiving the left channel signal LC and the ground point GP, wherein the ground point GP provides a ground voltage. The second switch 130 is disposed on the inner surface of the audio jack 110 , is coupled to the processing unit, and is coupled to a power supply voltage VDD through the resistor R1 . The processing unit receives the detection voltage DV from the second switch 130 . Since FIG. 1 mainly shows the structure of the audio processing device 10 , the processing unit is omitted in FIG. 1 , but the operation content of the processing unit will still be mentioned in the following description.

In the initial state of the audio processing device 10, the second switch 130 is in an open circuit (disconnection) state, while the first switch 120 is in a short circuit (conduction) state. The detection voltage DV is in a high potential state, that is, the voltage value of the power supply voltage minus the voltage drop across the resistor R1. The second switch 130 is disposed slightly away from the audio contact 114 receiving the left channel signal LC. When the connecting terminal 20 of the earphone is inserted into the audio jack 110 , the connecting terminal 20 of the earphone contacts the audio contacts 111 , 112 , 113 , 114 and the second switch 130 in sequence.

In this embodiment, the second switch 130 can be a physical mechanical switch. When the connecting terminal 20 is connected to the audio jack 110, the second switch 130 will be closed due to the stress of the earphone connecting terminal 20 inserted into the audio jack 110. Closed (conducting). Due to the conduction of the second switch 130, the detection voltage DV received by the processing unit is a low potential, and the processing unit judges that the earphone is inserted into the audio jack 110, and transmits a control signal to switch the audio processing device 10. The working mode is headphone mode.

Generally speaking, the audio processing device 10 does not have the first switch 120 which is normally closed. Since the internal resistance of the earpiece itself is not large, for example, about 32 ohms. In the absence of the first switch 120, when the connecting terminal 20 of the earphone is inserted into the audio jack 110, a DC voltage (such as the power supply voltage VDD, or the bias voltage of the left channel signal LC) will be fed back to the earpiece of the earphone, To cause the user to hear a "pop" noise from the earpiece of the earphone.

In this embodiment, when the connection terminal 20 of the earphone is connected to the audio jack 110, the first switch 120 is in a conducting state, so that the path for transmitting the left channel signal LC is grounded, so that the earphone end (that is, the earphone) The earpiece) can avoid the noise caused by the momentary DC voltage. And when the connecting terminal 20 of the earphone is inserted, and the first switch 120 is turned on for more than a predetermined time, the processing unit sends a control signal CS to turn off the first switch 120, so that the left channel signal LC can be transmitted to the earphone through the contact 114 The internal resistance is connected to the ground voltage (ground plane) through the terminal 113, so that the left channel of the earphone emits audio through the left channel signal LC.

In this embodiment, since the conduction of the first switch 120 is only to eliminate the noise caused by the earphone's internal resistance due to the instantaneous DC voltage passing through the earphone, the above-mentioned predetermined time can only be set within 1-2 milliseconds, but The present invention is not limited thereto. In the present invention, the second switch 130 can also be arranged to be connected to the contacts 111-113, and the second switch 130 can also be a switch of other forms such as a transistor. The audio processing device 10 can be set together with various electronic devices such as a personal computer, a notebook computer, a smart phone, a tablet computer, or a music player. The processing unit of the audio processing device 10 can be set together with the processor of the above-mentioned electronic device, or can be set independently. In the above-mentioned situation where the processing unit of the audio processing device 10 is independently set, the processing unit can be implemented as a system-on-chip (System on Chip, SoC), or several logic gates in cooperation with physical circuits such as counting circuits, and the present invention does not limit the above-mentioned implementation. Way.

FIG. 2 is a diagram showing the timing relationship between the conduction states of the first switch and the second switch and the detection voltage according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 2 , when the time interval T1 is the initial state, that is, the audio processing device 10 is started, and when the audio jack 110 is not yet connected to the connecting terminal 20 of the earphone, the switch 120 is turned on, and the switch 130 is turned on. disconnected state. During the time interval T2 , the connecting terminal 20 of the earphone is inserted into the audio jack 110 , and the switch 130 is turned on by the stress of the connecting terminal 20 inserted into the audio jack 110 . Moreover, due to the conduction of the switch 130 at this time, the detection voltage DV is converted from a high potential to a low potential, and the processing unit also judges from the change of the detection voltage DV that the connecting terminal 20 of the earphone has been inserted into the audio jack 110 .

The time interval T3 is when the connecting terminal 20 of the earphone is inserted into the audio jack 110 for more than a predetermined time, for example, 1 millisecond, the control unit sends a control signal CS to control the switch 120 to be turned off, so that the left channel signal LC can be normally transmitted to the earphone. The time interval T4 is the time when the earphone is used stably, and the switches 120 and 130 are kept off and on respectively. The time interval T5 indicates that the earphone is unplugged. When the connection terminal 20 of the earphone is pulled out, the switch 130 returns to the off state due to the disappearance of the stress. Since the switch 130 is turned off, the detection voltage DV received by the control unit also returns to a high potential state. When the control unit detects that the detection voltage DV is at a high potential, it sends an inverted control signal CS to the switch 120 to turn on the switch 120 . It can be seen from this that when the earphone is unplugged, the states of the switches 130 and 120 return to the initial state, just like the switch state of the time interval T1.

It is worth mentioning that the implementation of the control signal CS is related to the implementation of the first switch 120, for example, when it is controlled to be turned on, a high potential signal is continuously sent, and when it is controlled to be turned off, a low potential signal is continuously sent, or A pulse signal is sent to control the on/off of the first switch 120 so that the first switch 120 is turned on/off alternately. The present invention is not limited to the above-mentioned embodiments.

The present invention provides an audio processing method, which is suitable for an audio processing device and used for eliminating the noise caused by plugging and unplugging an earphone. FIG. 3 is a flowchart illustrating an audio processing method according to an embodiment of the present invention. Please refer to FIG. 3 , firstly in step S301 , it is detected whether an earphone is plugged into an audio jack of the audio processing device. Then, in step S302 , that is, when it is detected that the earphone is plugged in, a first switch of the audio processing device is turned on, wherein the first switch is coupled between one of an audio contact of the audio processing device and a ground point. Then in step S303, when the first switch is turned on for more than a predetermined time, the first switch is turned off. As for the detailed implementation of the present invention, reference may be made to the descriptions of the above-mentioned embodiments in FIG. 1 and FIG. 2 , and details are not repeated here.

To sum up, the present invention provides an audio processing device and an audio processing method. When the earphone is inserted into the audio jack of the audio processing device, the path of the DC voltage is first grounded so that it will not be interrupted due to the internal resistance of the earphone passing through the earphone instantaneously. generates noise. The noise caused by plugging and unplugging the earphone every time can be eliminated.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (8)

1. a kind of apparatus for processing audio, noise during eliminating headset plugging, it is characterised in that including：

One audio jack, including multiple audio contacts；

One processing unit, detect whether an earphone is inserted into the audio jack by the audio jack；And

One first switch, its first end are coupled to one of those audio contacts, and the second end of the first switch is coupled to a ground connection Point；

One second switch, its first end are coupled to the first end of the first switch, and the second end of the second switch passes through a resistance Receive supply voltage,

Wherein, when the earphone is not inserted into the audio jack, the second switch is worked as the apparatus for processing audio and started to disconnect And the processing unit, when detecting the earphone and being not inserted into the audio jack, the processing unit turns on the first switch；

When the earphone is inserted into the audio jack, the second switch is led according to the stress that the connection terminal of the earphone provides It is logical；

After the processing unit, which detects the earphone, is inserted beyond a scheduled time, the processing unit disconnects the first switch；With And

When the processing unit, which detects the earphone, to be pulled out, the processing unit turns on the first switch.

2. apparatus for processing audio according to claim 1, it is characterised in that those audio contacts include a left audio Contact, a right audio channel contact, a ground contact and Mike's air contact.

3. apparatus for processing audio according to claim 1, it is characterised in that the processing unit judges according to a detection voltage Whether the earphone is inserted into, wherein, when the detection voltage is a low potential, the processing unit judges that the earphone is inserted into.

4. apparatus for processing audio according to claim 3, it is characterised in that the second switch is arranged in the audio jack On surface, and the processing unit is coupled,

Wherein, when the earphone is inserted into, the detection voltage is the low potential.

5. a kind of audio-frequency processing method, suitable for an apparatus for processing audio, to eliminate the noise caused by a headset plugging, its It is characterised by, including：

When the apparatus for processing audio starts and one earphone of detection is not inserted into an audio jack of the apparatus for processing audio, conducting One first switch, and a second switch is disconnected, the first end of the wherein first switch is coupled to a sound of the apparatus for processing audio Frequency contact, the second end of the first switch are coupled to an earth point, and the first end of the second switch couples the audio contact, and this Second end of two switches receives supply voltage by resistance；

When the earphone inserts the audio jack, the second switch is led according to the stress that the connection terminal of the earphone provides It is logical；

When detect the earphone be inserted beyond a scheduled time after, disconnect the first switch；And

When detect the earphone be pulled out when, turn on the first switch.

6. audio-frequency processing method according to claim 5, it is characterised in that the audio contact is that a left audio connects Point, a right audio channel contact, a ground contact or Mike's air contact.

7. audio-frequency processing method according to claim 5, it is characterised in that the step of whether earphone of detection one is inserted into Also include：

Judge whether the earphone is inserted into according to a detection voltage, wherein, when the detection voltage is a low potential, judge the ear Machine is inserted by this.

8. audio-frequency processing method according to claim 7, it is characterised in that whether the earphone is judged according to the detection voltage The step of being inserted into also includes：

When the second switch is switched on, the detection voltage is the low potential.