TWI429300B - Electronic apparatus - Google Patents

Description

Electronic equipment

The present invention relates to an electronic device, and more particularly to an electronic device having an audio output function.

With the rapid development of the electronics industry, various audio/video electronic devices have begun to enter people's lives. Such as MP3, MP4, Walkman, video player and portable CD player. People enjoy music and watch movies through audio/video electronic devices, which enrich people's spare time.

In order to meet the needs of consumers in different occasions, most of the consumer electronics in the industry are designed with speakers and headphones, users can choose to use speakers or headphones to enjoy music. When the user needs to use headphones to listen to music, the earphone is inserted into the earphone jack of the electronic product, and the earphone plays sound. When the user needs to use the speaker to listen to music, the earphone is pulled out from the earphone jack, and the speaker plays the sound. Usually, the volume of the sound played by the speaker is large, and the volume of the sound played by the earphone is small.

Most electronic products use digital control mode (discontinuity control) for the volume adjustment part of the speaker and earphone, that is, different volume output levels, corresponding to different gain values. However, at present, consumer electronic products use the same volume adjustment mode for the volume adjustment part of the speaker and the earphone, and the volume adjustment mode generally sets the volume output level value by using an output mode (such as a speaker) as a standard. When based on The speaker standard sets the volume output level value, and when listening to music with headphones, the user can't listen because of the loud volume; when the volume output level value is set based on the earphone standard, and the sound is played by the speaker, the volume is smaller. And can't enjoy music in the noisy surroundings. In this way, it is difficult to meet the different needs of the user for the volume adjustment of the speaker and the earphone.

In view of this, it is necessary to provide an electronic device that can meet different volume adjustment requirements.

An electronic device includes a power amplifying unit having a control end and a volume adjusting end, a voltage dividing unit, a volume adjusting unit, a headphone interface circuit, and a speaker. The power amplifying unit is configured to perform power amplification processing on the audio signal, and output the processed audio signal to the earphone interface circuit and the speaker respectively. The earphone interface circuit includes a headphone jack for connecting with the earphone and a switch unit for detecting whether the earphone is inserted. The switch unit is connected between the earphone jack and the control end for adjusting a voltage generated by the voltage dividing unit and transmitted to the control terminal according to whether the earphone is inserted into the earphone jack. The power amplifying unit controls whether the speaker operates according to the voltage received at its control terminal. The volume adjustment unit stores a speaker gain level value and a headphone gain level value, and the volume adjustment unit is connected between the control end and the volume adjustment end. The volume adjusting unit respectively generates a speaker adjustment signal and a headphone adjustment signal according to the speaker gain level value and the earphone gain level value, and the speaker adjustment signal is used to adjust the volume of the speaker playing sound, and the earphone adjusting signal is used to play the sound to the earphone. The volume is adjusted.

In the above electronic device, the volume of the speaker playing sound is adjusted by calling the speaker gain level value by the volume adjusting unit, and the headphone gain level value is called to the headphone The volume of the sound is adjusted to meet the different needs of the user for adjusting the volume of the speaker and the headphone.

100, 200‧‧‧ electronic devices

10‧‧‧Audio interface

12‧‧‧Power amplification unit

14, 15‧‧‧ Speakers

16‧‧‧ headphone interface circuit

C1‧‧‧First electrolytic capacitor

C2‧‧‧Second electrolytic capacitor

18‧‧‧ headphones

20‧‧‧Voltage unit

23, 27‧‧‧ power interface

22‧‧‧First partial pressure unit

24‧‧‧Second voltage division unit

25‧‧‧ Third pressure division unit

26‧‧‧Control unit

28‧‧‧Volume adjustment unit

123‧‧‧Volume adjustment side

120‧‧‧Signal input

122‧‧‧Control terminal

124, 126‧‧ ‧ positive phase output

125, 128‧‧‧ Negative phase output

160‧‧‧ headphone jack

162‧‧‧Switch unit

164, 165‧‧‧ conductive end

168‧‧‧ Grounding terminal

166, 169‧‧‧ contact end

R1~R8‧‧‧ resistance

V1, V2‧‧‧ DC power supply

Q1‧‧‧ triode

1 is a detailed circuit diagram of an electronic device of a first preferred embodiment.

2 is a detailed circuit diagram of an electronic device of a second preferred embodiment.

FIG. 1 is a specific circuit diagram of the electronic device 100 of the first preferred embodiment. The electronic device 100 includes an audio interface 10, a power amplifying unit 12, speakers 14, 15, a first electrolytic capacitor C1, a second electrolytic capacitor C2, a fourth resistor R4, a headphone interface circuit 16, an earphone 18, a voltage dividing unit 20, and a volume adjustment. Unit 28. The headphone interface circuit 16 includes an earphone jack 160 into which the earphone 18 is inserted and a switch unit 162.

The audio interface 10 is used to connect an audio source to provide an audio signal to the signal input terminal 120 of the power amplifying unit 12.

The power amplifying unit 12 is configured to receive an audio signal, perform power amplification processing on the audio signal, and output the processed audio signal to the speakers 14, 15 and the earphone jack 160, respectively. In particular, power amplifying unit 12 has positive phase outputs 124, 126 and negative phase outputs 125, 128. The power amplifying unit 12 supplies the audio signal to the headphone jack 160 via its positive phase output terminals 124, 126, respectively. The power amplifying unit 12 also supplies audio signals to the speaker 14 and the speaker 15 through its normal phase output terminal 124, negative phase output terminal 125 and positive phase output terminal 126, and negative phase output terminal 128, respectively.

The power amplifying unit 12 also has a control terminal 122. When the input voltage of the control terminal 122 is low, the positive phase output terminals 124, 126 respectively output the positive phase audio signals to the speakers 14, 15; the negative phase output terminals 125, 128 respectively output the negative phase audio signals to the speaker. The inverted audio signals are superimposed on each other, so that the volume of the sound played by the speakers 14, 15 can be increased. When the input voltage of the control terminal 122 is high level, the positive phase output terminals 124, 126 respectively output the audio signals of the positive phase to the speakers 14, 15 respectively, and the negative phase output terminals 125, 128 also output the audio signals of the positive phase to the speaker 14, respectively. 15, the in-phase audio signals cancel each other, so that the speakers 14, 15 stop playing the sound.

The positive electrode of the first electrolytic capacitor C1 is connected to the positive phase output terminal 124, and the negative electrode is connected to the earphone jack 160. The first electrolytic capacitor C1 is used to filter out the DC voltage component in the audio signal input from the positive phase output terminal 124 to the earphone jack 160. The positive electrode of the second electrolytic capacitor C2 is connected to the positive phase output terminal 126, and the negative electrode is connected to the earphone jack 160. The second electrolytic capacitor C2 is used to filter out the DC voltage component in the audio signal input from the positive phase output terminal 126 to the earphone jack 160.

The earphone jack 160 includes conductive ends 164, 165 and a ground end 168. The conductive end 164 is connected to the negative electrode of the first electrolytic capacitor C1, the conductive end 165 is connected to the negative electrode of the second electrolytic capacitor C2, and the ground terminal 168 is grounded. The conductive terminals 164 and 165 receive the audio signals output from the positive phase output terminals 124 and 126 of the power amplifying unit 12 through the first electrolytic capacitor C1 and the second electrolytic capacitor C2, respectively. The conductive ends 164, 165 and the ground terminal 168 are used to provide an audio signal to the earphone 18 when the earphone 18 is inserted into the earphone jack 160 to play the sound.

The switch unit 162 is turned on when the earphone 18 is not inserted into the earphone jack 160, and is turned off when the earphone 18 is inserted into the earphone jack 160. Switch unit 162 includes contact ends 166, 169, one end of which is coupled together. The contact ends 166, 169 are electrically connected to the conductive ends 164, 165, respectively, when the earphones 18 are not inserted into the earphone jacks 160. The contact ends 166, 169 are also disconnected from the conductive ends 164, 165, respectively, when the earphone 18 is inserted into the earphone jack 160.

The voltage dividing unit 20 includes a first voltage dividing unit 22, a power supply interface 23, and a second voltage dividing unit 24 And a third voltage dividing unit 25. The first voltage dividing unit 22 is connected to the switch unit 162, and the second voltage dividing unit 24 and the third voltage dividing unit 25 are respectively connected to the earphone jack 160. The first voltage dividing unit 22 is also connected to the power supply interface 23, and the power supply interface 23 is used to connect the DC power supply V1. The first voltage dividing unit 22, the second voltage dividing unit 24, and the third voltage dividing unit 25 are used to collectively divide the DC power source V1 when the switching unit 162 is turned on to generate a first electrical signal. The first voltage dividing unit 22 is further configured to separately divide the DC power source V1 when the switching unit 162 is turned off to generate a second electrical signal. In this embodiment, the first electrical signal is a low level signal, and the second electrical signal is a high level signal.

The first voltage dividing unit 22 includes a first resistor R1. One end of the first resistor R1 is connected between the contact terminals 166, 169 and the fourth resistor R4, and the other end is connected to the DC power source V1. The fourth resistor R4 is connected between the contact terminals 166, 169 and the control terminal 122. The second voltage dividing unit 24 includes a second resistor R2. One end of the second resistor R2 is connected between the negative electrode of the first electrolytic capacitor C1 and the conductive end 164, and the other end is grounded. The third voltage dividing unit 24 includes a third resistor R3. One end of the third resistor R3 is connected between the negative electrode of the second electrolytic capacitor C2 and the conductive end 165, and the other end is grounded. In this embodiment, the DC power supply V1 is 5V, the resistance of the first resistor R1 is 100KΩ, the resistance of the second resistor R2 is 1KΩ, and the resistance of the third resistor R3 is 1KΩ. When the earphone 18 is not inserted into the earphone jack 160, the switch unit 162 is turned on. Thus, the first resistor R1, the second resistor R2, and the third resistor R3 collectively divide the DC power supply V1, and the voltage value of the second resistor R2 is obtained, that is, the voltage value of the point A in FIG. 1: VA=V1*R2/ /R3/(R1+R2//R3)=5*0.5/(100+0.5)V 0.02V

The voltage at point A is further lowered after passing through the fourth resistor R4, so that the control terminal 122 is a low level signal. When the earphone 18 is inserted into the earphone jack 160, the switch unit 162 is disconnected, and the DC power source V1 is connected to the control terminal 122 through the first resistor R1 and the fourth resistor R4, so that the control terminal 122 is a high level signal.

The first amplifying signal received by the power amplifying unit 12 in response to the control terminal 122 outputs an inverted audio signal through the positive phase output terminal 124, the negative phase output terminal 125, the positive phase output terminal 126 and the negative phase output terminal 128, respectively. The speaker 14 and the speaker 15 are used to play sound. The power amplifying unit 12 also outputs an in-phase audio signal to the second electrical signal received by the control terminal 122 via its normal phase output terminal 124, the negative phase output terminal 125, the positive phase output terminal 126, and the negative phase output terminal 128. The speaker 14 and the speaker 15 are such that the earphone 18 plays sound.

The power amplifying unit 12 also has a volume adjusting end 123. The volume adjustment unit 28 is connected between the control terminal 122 and the volume adjustment terminal 123. A speaker gain level value and an earphone gain level value are previously set in the volume adjustment unit 28. For example, the volume adjustment step interval of the electronic device 100 is 1 to 20, and the speaker gain level value and the headphone gain level value respectively have 20 different gain values for respectively performing gain amplification on the audio signal. The speaker gain value, which is usually at the same volume adjustment order (such as order 2), is greater than the headphone gain value, that is, the speaker playback sound is louder than the earphone.

The volume adjustment unit 28 is configured to invoke the speaker gain level value in response to the first electrical signal to generate a speaker adjustment signal to the volume adjustment terminal 123. The power amplifying unit 12 adjusts the volume of the sounds played by the speakers 14, 15 according to the speaker adjustment signal received by the volume adjustment terminal 123.

The volume adjustment unit 28 also calls the earphone gain level value in response to the second electrical signal to generate a headphone adjustment signal to the volume adjustment terminal 123. The power amplifying unit 12 adjusts the volume of the sound played by the earphone 18 according to the earphone adjusting signal received by the volume adjusting terminal 123. In this way, the user can control the electronic device 100 to call the earphone gain level value, and increase or decrease the earphone by operating a remote controller (not shown) or a button on the electronic device 100 (not shown) when the earphone 18 plays the sound. 18 output sound volume; user also When the sounds are played by the speakers 14, 15 by operating a remote controller (not shown) or a button (not shown) on the electronic device 100, the control electronic device 100 calls the speaker gain level value to increase or decrease the speaker 14 15, the volume of the output sound; can meet the different needs of the user to play the sound volume of the speakers 14, 15 and headphones 18.

FIG. 2 is a specific circuit diagram of the electronic device 200 of the second preferred embodiment. The electronic device 200 differs from the electronic device 100 in that the electronic device 200 further includes a control unit 26. The control unit 26 is connected between the control terminal 122 and the volume adjustment unit 28.

The control unit 26 is configured to respond to the first electrical signal to generate a first control signal. The volume adjustment unit 28 is configured to respond to the first control signal and call the speaker gain level value to generate a speaker adjustment signal to the volume adjustment terminal 123. The power amplifying unit 12 adjusts the volume of the sounds played by the speakers 14, 15 according to the speaker adjustment signal received by the volume adjustment terminal 123.

The control unit 26 is further configured to respond to the second electrical signal to generate a second control signal. The volume adjustment unit 28 is configured to respond to the second control signal and invoke the earphone gain level value to generate the earphone adjustment signal to the volume adjustment end 123. The power amplifying unit 12 adjusts the volume of the sound played by the earphone 18 according to the earphone adjusting signal received by the volume adjusting terminal 123. In this embodiment, the first control signal is a high level signal, and the second control signal is a low level signal.

The control unit 26 includes a transistor Q1, a power supply interface 27, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. The power interface 27 is used to connect the DC power source V2, the fifth resistor R5 is connected between the fourth resistor R4 and the sixth resistor R6, and the sixth resistor R6 is grounded. One end of the seventh resistor R7 is connected between the fifth resistor R5 and the sixth resistor R6, and the other end is connected to the base of the transistor Q1. The emitter of the transistor Q1 is grounded, and the collector is connected to the DC power source V2 through the eighth resistor R8. The collector of the transistor Q1 is also connected to the volume adjustment Section unit 28.

When the earphone 18 is not inserted into the earphone jack 160, the switch unit 162 is turned on, and the control terminal 122 receives the first electrical signal, that is, the voltage at point A in FIG. 2 is a low level voltage, and the speakers 14, 15 play the sound. The base of the transistor Q1 is extremely low voltage, and the transistor Q1 is turned off. The DC power source V2 applies a high level voltage to the volume adjusting unit 28 through the fifth resistor R5, that is, the voltage VB at point B in FIG. 2 is a high level voltage. The volume adjustment unit 28 calls the speaker gain level value according to the high level voltage received by the speaker to generate a speaker adjustment signal to the volume adjustment terminal 123. The power amplification unit 12 adjusts the signal to the speaker 14 according to the speaker adjustment signal received by the volume adjustment terminal 123. 15 The volume of the playback sound is adjusted.

When the earphone is inserted into the earphone jack 160, the switch unit 162 is turned off, and the control terminal 122 receives the second electrical signal, that is, the voltage at the point A in FIG. 2 is a high level voltage, and the earphone 18 plays the sound. The base of the transistor Q1 is extremely high-level voltage, the transistor Q1 is turned on, and the collector of the transistor Q1 is grounded, that is, the voltage at point B in FIG. 2 is a low-level voltage. The volume adjustment unit 28 calls the earphone gain level value according to the low level voltage received by the microphone to generate the earphone adjustment signal to the volume adjustment terminal 123. The power amplification unit 12 plays the earphone adjustment signal according to the volume adjustment terminal 123 thereof. The volume of the sound is adjusted.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above descriptions are only preferred embodiments of the present invention, and those skilled in the art will be able to include equivalent modifications or variations in the spirit of the present invention.

200‧‧‧Electronic devices

10‧‧‧Audio interface

12‧‧‧Power amplification unit

14, 15‧‧‧ Speakers

16‧‧‧ headphone interface circuit

C1‧‧‧First electrolytic capacitor

C2‧‧‧Second electrolytic capacitor

18‧‧‧ headphones

20‧‧‧Voltage unit

23, 27‧‧‧ power interface

22‧‧‧First partial pressure unit

24‧‧‧Second voltage division unit

25‧‧‧ Third pressure division unit

26‧‧‧Control unit

28‧‧‧Volume adjustment unit

123‧‧‧Volume adjustment side

120‧‧‧Signal input

122‧‧‧Control terminal

124, 126‧‧ ‧ positive phase output

125, 128‧‧‧ Negative phase output

160‧‧‧ headphone jack

162‧‧‧Switch unit

164, 165‧‧‧ conductive end

168‧‧‧ Grounding terminal

166, 169‧‧‧ contact end

R1~R8‧‧‧ resistance

V1, V2‧‧‧ DC power supply

O1‧‧‧ triode

Claims (13)

An electronic device includes a power amplifying unit having a control end, a voltage dividing unit, a headphone interface circuit and a speaker, wherein the power amplifying unit is configured to perform power amplification processing on the audio signal, and output the processed audio signal to the earphone interface circuit respectively And a speaker, the earphone interface circuit comprises a headphone jack for connecting with the earphone and a switch unit for detecting whether the earphone is inserted, the switch unit is connected between the earphone jack and the control end, and is used for adjusting the partial pressure according to whether the earphone is inserted into the earphone jack The voltage generated by the unit is transmitted to the control terminal, and the power amplifying unit controls whether the speaker operates according to the voltage received by the control terminal thereof. The improvement is that the electronic device further includes a volume adjusting unit, and the speaker adjusting unit stores the speaker gain level. The value and the headphone gain level value, the power amplifying unit further has a volume adjusting unit connected between the control end and the volume adjusting end, the volume adjusting unit calls the speaker gain level value according to the voltage and generates a speaker adjusting signal Or call the headset The power level unit generates a headphone adjustment signal, and the power amplifying unit adjusts the volume of the received audio signal according to the speaker adjustment signal value and outputs the sound through the speaker, and the power amplifying unit adjusts the earphone adjustment signal according to the earphone adjustment level value. The volume of the audio signal is output through the headphones. The electronic device of claim 1, wherein the switch unit is connected to a volume adjustment unit for turning on when the earphone is not inserted into the earphone jack, and for disconnecting when the earphone is inserted into the earphone jack. The electronic device of claim 1, wherein the voltage dividing unit comprises a power supply interface connected to a DC power source, a first voltage dividing unit and a second voltage dividing unit, wherein the first voltage dividing unit is connected to the switching unit, The second voltage dividing unit is connected to the earphone jack, and the switch unit is used for turning on when the earphone is not inserted into the earphone jack, and the first voltage dividing unit and the second voltage dividing unit are used for the switching unit to be turned on. The DC power source is jointly divided to generate a first electrical signal to the control terminal, and the power amplifying unit controls the speaker operation according to the first electrical signal received by the control terminal thereof. The electronic device of claim 3, wherein the switch unit is further configured to be disconnected when the earphone is inserted into the earphone jack, and the first voltage dividing unit is further configured to separately divide the DC power source when the switch unit is disconnected, The second signal is generated to the control end, and the power amplifying unit further controls the speaker to stop working according to the second electrical signal received by the control terminal. The electronic device of claim 4, wherein the first electrical signal is a low level signal and the second electrical signal is a high level signal. The electronic device of claim 4, wherein the electronic device further comprises a control unit, the control unit is connected between the control end and the volume adjustment unit, and the control unit generates the first control signal in response to the first electrical signal. The volume adjustment unit calls the speaker gain level value to generate a speaker adjustment signal according to the first control signal, the control unit further generates a second control signal in response to the second electrical signal, and the volume adjustment unit further invokes the earphone gain according to the second control signal. The level value is used to generate a headphone adjustment signal. The electronic device of claim 6, wherein the first control signal is a high level signal, the second control signal is a low level signal, and the control unit comprises a power supply interface, a triode, and a fifth connected to the DC power source. a resistor, a sixth resistor, a seventh resistor and an eighth resistor, wherein the fifth resistor is connected between the control terminal and the sixth resistor, one end of the sixth resistor is connected to the fifth resistor, and the other end is grounded, and one end of the seventh resistor It is connected between the fifth resistor and the sixth resistor, and the other end is connected to the base of the triode. The collector of the triode is connected to the DC power source through the eighth resistor, and the emitter is grounded. The volume adjusting unit is connected to the collector of the triode. The electronic device of claim 3, wherein the earphone jack comprises a conductive end and a ground end, the conductive end is connected to the power amplifying unit, and the switch unit comprises a contact end, wherein the contact end is used when the earphone is not inserted into the earphone jack The electrical connection is electrically connected to the conductive end, and the contact end is further used for disconnecting the conductive end from the earphone when the earphone is inserted into the earphone jack. The electronic device of claim 8, wherein the first voltage dividing unit comprises a first resistor, one end of the first resistor is connected to the contact end, the other end is connected to a DC power source, and the second voltage dividing unit comprises a second A resistor, one end of the second resistor is connected to the conductive end, and the other end is grounded. The electronic device of claim 8, wherein the electronic device further comprises a fourth resistor connected between the contact end and the control end. The electronic device of claim 4, wherein the power amplifying unit has a positive phase output terminal and a negative phase output terminal, the earphone jack is connected to the positive phase output terminal, and the speaker is respectively connected to the positive phase output terminal and the negative phase output terminal. end. The electronic device of claim 11, wherein the electronic device further comprises an electrolytic capacitor, the positive electrode of the electrolytic capacitor is connected to the positive phase output end, and the negative electrode is connected to the earphone socket, wherein the electrolytic capacitor is used for filtering out the positive phase output terminal. The DC voltage component of the audio signal transmitted to the headphone jack. The electronic device of claim 11, wherein the power amplifying unit outputs a positive phase audio signal according to the first electrical signal received by the control terminal, and the negative phase output terminal outputs a negative phase. The audio signal unit outputs a positive phase audio signal according to the second electrical signal received by the control terminal, and the negative phase output terminal also outputs a positive phase audio signal.