CN219268833U

CN219268833U - Audio switching circuit and device

Info

Publication number: CN219268833U
Application number: CN202223465708.3U
Authority: CN
Inventors: 黄卫员; 梁建立
Original assignee: Tonly Electronics Holdings Ltd
Current assignee: Tonly Electronics Holdings Ltd
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-06-27
Anticipated expiration: 2032-12-22

Abstract

The utility model discloses an audio switching circuit and a device, wherein a first switching module of the circuit consists of discrete devices, and when an audio blocking signal is received by a driving module, a first blocking trigger signal is output to the first switching module; when the first switch module receives the first blocking trigger signal, the blocking driving module outputs an audio signal. According to the utility model, the first switch module formed by the discrete devices blocks the driving module to output the audio signal after receiving the first blocking trigger signal, and compared with the prior art that the audio control is performed through the expensive switch chip, the circuit effectively reduces the cost of the audio switch, thereby reducing the cost of the audio control.

Description

Audio switching circuit and device

Technical Field

The utility model relates to the technical field of audio and video, in particular to an audio switching circuit and an audio switching device.

Background

Music output by the intelligent device is processed through DSP sound effects in the audio playing device (such as a headset) and amplified through ears, and then the loudspeaker is driven to make music sound. The current audio playing device realizes the playing and stopping of music by controlling the on and off of the audio switch, however, the audio switch realizing the functions on the market is a switch chip, which is expensive, resulting in higher cost of audio control.

The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present utility model and is not intended to represent an admission that the foregoing is prior art.

Disclosure of Invention

The utility model mainly aims to provide an audio switch circuit and an audio switch device, which aim to solve the technical problem of high audio control cost caused by high price of a switch chip used for audio control in the prior art.

To achieve the above object, the present utility model provides an audio switching circuit including: a driving module and a first switch module;

the first switch module consists of discrete devices and is respectively connected with the driving module and an external playing end;

the driving module is used for outputting a first blocking trigger signal to the first switch module when receiving the audio blocking signal;

the first switch module is used for blocking the driving module from outputting the audio signal to the playing end when the first blocking trigger signal is received.

Optionally, the first switch module includes a trigger unit and a switch unit;

the triggering unit is respectively connected with the driving module, the switching unit and the power supply, and the switching unit is respectively connected with the driving module and the playing end;

the trigger unit is used for disconnecting a first driving loop between the power supply and the switch unit when the first blocking trigger signal is received;

the switch unit is used for disconnecting the first playing loop between the driving module and the playing end when the first driving loop is disconnected, so as to block the driving module from outputting the audio signal to the playing end.

Optionally, the triggering unit includes: the circuit comprises a first triode, a first resistor, a second resistor and a first capacitor, wherein the first triode is a discrete device;

the emitter of the first triode is respectively connected with the first end of the first capacitor and the first end of the first resistor, the second end of the first capacitor is grounded, and the second end of the first resistor is connected with the power supply;

the base electrode of the first triode is connected with the first end of the second resistor, and the second end of the second resistor is connected with the driving module;

and the collector electrode of the first triode is connected with the switch unit.

Optionally, the triggering unit further includes: a second triode and a third resistor;

the collector electrode of the second triode is connected with the second end of the second resistor;

the base electrode of the second triode is connected with the first end of the third resistor, and the second end of the third resistor is connected with the driving module;

and the emitter electrode of the second triode is grounded.

Optionally, the switching unit includes: the playing end comprises a left loudspeaker and a right loudspeaker, and the first to fourth MOS tubes are discrete devices;

the grid electrode of the first MOS tube is respectively connected with the first end of the fourth resistor, the grid electrode of the second MOS tube and the collector electrode of the first triode, the source electrode of the first MOS tube is respectively connected with the second end of the fourth resistor and the source electrode of the second MOS tube, the drain electrode of the first MOS tube is connected with the driving module, and the drain electrode of the second MOS tube is connected with the right loudspeaker;

the grid of the third MOS tube is respectively connected with the first end of the fifth resistor, the grid of the fourth MOS tube and the collector of the first triode, the source of the third MOS tube is respectively connected with the second end of the fifth resistor and the source of the fourth MOS tube, the drain of the third MOS tube is connected with the driving module, and the drain of the fourth MOS tube is connected with the left loudspeaker.

Optionally, the audio switching circuit further comprises: a second switch module;

the second switch module consists of a switch chip, and is respectively connected with an audio source and the playing end, and the audio source is connected with the driving module;

the driving module is further used for outputting a first switch-on trigger signal to the second switch module when the audio blocking signal is received;

the second switch module is used for conducting a second play loop between the audio source and the play end when the first switch-on trigger signal is received;

and the audio source is used for outputting the audio signal to the playing end when the second playing loop is conducted so that the playing end plays the audio signal.

Optionally, the device is further configured to output a second on trigger signal to the trigger unit when receiving the audio on signal;

the triggering unit is further used for conducting a first driving loop between the power supply and the switching unit when the second switching-on triggering signal is received, so that the power supply outputs a power triggering signal to the switching unit;

the switch unit is used for conducting a first play loop between the drive module and the play end when the power trigger signal is received;

the driving module is further configured to output an audio signal of an audio source to the playing end when the first playing loop is turned on, so that the playing end plays the audio signal.

Optionally, the driving module is further configured to output a second blocking trigger signal to the second switching module when receiving an audio on signal;

the second switch module is further configured to disconnect a second playback loop between the audio source and the playback end when the second blocking trigger signal is received.

Furthermore, to achieve the above object, the present utility model also proposes an audio switching device comprising an audio switching circuit as described above.

The first switch module of the audio switch circuit consists of discrete devices, and outputs a first blocking trigger signal to the first switch module when receiving an audio blocking signal through the driving module; when the first switch module receives the first blocking trigger signal, the blocking driving module outputs an audio signal. According to the utility model, the first switch module formed by the discrete devices blocks the driving module to output the audio signal after receiving the first blocking trigger signal, and compared with the prior art that the audio control is performed through the expensive switch chip, the circuit effectively reduces the cost of the audio switch, thereby reducing the cost of the audio control.

Drawings

FIG. 1 is a schematic diagram of a first embodiment of an audio switch circuit according to the present utility model;

FIG. 2 is a schematic diagram of a conventional audio switching circuit according to a first embodiment of the present utility model;

FIG. 3 is a schematic diagram of a second embodiment of an audio switch circuit according to the present utility model;

FIG. 4 is a schematic diagram of a first circuit of a trigger unit in a second embodiment of the audio switching circuit of the present utility model;

FIG. 5 is a schematic diagram of a second circuit of a trigger unit in a second embodiment of the audio switching circuit of the present utility model;

FIG. 6 is a schematic circuit diagram of a switching unit in a second embodiment of an audio switching circuit according to the present utility model;

FIG. 7 is a schematic diagram of a third embodiment of an audio switch circuit according to the present utility model;

FIG. 8 is a schematic circuit diagram of a second switch module in a third embodiment of an audio switch circuit according to the present utility model;

fig. 9 is a schematic diagram of a third circuit of the trigger unit in a third embodiment of the audio switch circuit of the present utility model.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, all embodiments obtained by persons skilled in the art based on the embodiments in the present utility model without making creative efforts, belong to the protection scope of the present utility model.

It should be noted that the descriptions of "first," "second," etc. in the embodiments of the present utility model are for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may explicitly or implicitly include at least one such feature, and further, the technical solutions between the various embodiments may be combined with one another, but must be based on the fact that one of ordinary skill in the art can implement such a combination, and such combination should be considered to be absent or outside the scope of the claimed utility model when such combination is inconsistent or otherwise unrealizable.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of an audio switching circuit according to the present utility model.

As shown in fig. 1, the audio switching circuit of the present embodiment includes: the driving module 100 and the first switching module 200.

Wherein the first switch module 200 is composed of discrete devices, and the first switch module 200 is connected with the driving module 100.

The driving module 100 is configured to output a first blocking trigger signal to the first switching module 200 when receiving an audio blocking signal.

For ease of understanding, the description is given with reference to fig. 2, but the present solution is not limited thereto. Fig. 2 is a schematic diagram of an audio switch circuit according to a first embodiment of the present utility model, in which the audio switch circuit is applied to an audio playing device for playing audio, the driving module 100 includes a main control sub-module, a wireless sub-module, a power sub-module, an amplifying sub-module and an audio processing sub-module, the power sub-module is respectively connected with the wireless sub-module, the main control sub-module, the audio processing sub-module and the amplifying sub-module, the audio processing sub-module is connected with the audio source 400, the amplifying sub-module is respectively connected with the first switch chip SW1 and the second switch chip SW2, the first switch chip SW1 is connected with the right speaker, the second switch chip SW2 is connected with the left speaker, the audio source 400 is also connected with the third switch chip and the fourth switch chip, the third switch chip SW3 is connected with the right speaker, the fourth switch chip SW4 is connected with the left speaker, wherein the main control sub-module in the driving module 100 can control the on and off of the switch chips by outputting a trigger signal, and the first to fourth switch chips SW1 to SW4 are low-level on switch chips.

As shown in fig. 2, when the trigger signal en_sw1 of the first switch chip SW1 is at a low level and the trigger signal en_sw2 of the second switch chip SW2 is at a low level, the first switch chip SW1 and the second switch chip SW2 are turned on, and the audio processing sub-module can receive an initial audio signal output by the audio source 400, where the initial audio signal includes an initial audio signal aux_r of a right channel and an initial audio signal aux_l of a left channel, the initial audio signal is output to the amplifying sub-module after being subjected to audio processing by the audio processing sub-module, and after being subjected to ear amplification by the amplifying sub-module, the positive end audio signal spk_rp of the right speaker is output to the positive end of the right speaker through the first switch chip, and the negative end audio signal spk_rn of the right speaker is output to the negative end of the right speaker, thereby playing music is achieved.

It can be understood that the above-mentioned initial audio signals, i.e., the initial audio signal aux_r of the right channel and the initial audio signal aux_l of the left channel, are initial signals output from the audio source that have not been subjected to sound effect processing and ear amplification.

It should be noted that, when the audio playing device is in the off state or the charging state, the first switch chip SW1 and the second switch chip SW2 are turned off, the driving module 100 cannot receive the initial audio signal output by the audio source 400, at this time, the main control submodule outputs the trigger signals en_sw3 of the third switch chip to the third switch chip SW3 of the low level, so that the third switch chip SW3 is turned on, and simultaneously outputs the trigger signals en_sw4 of the fourth switch chip to the fourth switch chip SW4 of the low level, so that the fourth switch chip SW3 is turned on, so that the initial audio signal aux_r of the right channel output by the audio source 100 is output to the right speaker through the third switch chip SW3, the initial chip signal aux_l of the left channel output is output to the left speaker through the fourth switch chip SW4, and the positive end of the right speaker and the positive end of the left speaker are grounded through the switch chips, thereby realizing playing of music.

It can be understood that the switch chip is expensive, which results in higher cost of audio control, and even if the switch chip is out of stock, the audio control cannot be implemented, so the embodiment is provided to reduce the cost of audio control and ensure stable audio control.

It should be noted that, the audio playing device, such as a headset, may support active mode and passive mode, where the active mode refers to that the audio source 400 outputs an initial audio signal that is processed by the driving module 100 and then played, and the passive mode refers to that the audio playing device is in a power-off state or a charging state with no power to the battery, and at this time, the audio source 400 outputs the initial audio signal directly to the left speaker and the right speaker for playing via the third switch chip SW3 and the fourth switch chip SW 4.

It can be understood that the audio blocking signal may be the signal triggered by the passive mode, so as to block the driving module from outputting the audio signal to the playing end. A step of

It should be understood that the playing end may be a port for playing audio in the audio playing device, the left speaker and the right speaker in fig. 2 are speakers for playing audio in the playing end, and the playing end is external to the audio switch circuit in this embodiment.

It should be noted that, the first blocking trigger signal may be a signal that triggers the first switch module to be in the off state 200.

In a specific implementation, the audio control device applied to the audio switching circuit of this embodiment may trigger the audio blocking signal when the audio control device is currently in a shutdown state or in a charging state where the battery is dead, and when the driving module 100 receives the audio blocking signal, it outputs a first blocking trigger signal that triggers the first switching module 200 to be in an off state to the first switching module 200.

The first switch module 200 is configured to block the driving module 100 from outputting an audio signal when receiving the first blocking trigger signal.

It should be noted that, the first switch module 200 is formed by a discrete device, which may be a device formed by a plurality of switch tubes, and the discrete device has the same function as the switch chip, so that the switch chip can be replaced, and the cost is reduced.

It should be noted that, the above-mentioned audio signal may be a final audio signal obtained by performing audio processing and ear amplification on the initial audio signal output by the audio source 400 by the driving module 100.

In a specific implementation, the first switch module 200 may be used as a switch on a first playback loop between the driving module 100 and a playback end, and the first blocking trigger signal may trigger the first switch module 200 to be turned off, so as to disconnect the first playback loop between the driving module 100 and an external playback end, block an audio signal output from the driving module 100 to the playback end, and complete the blocking function on the audio signal in a passive mode, that is, in a charging state and a shutdown state.

It should be understood that the first playback loop may be formed by the driving module 100 and a playback end outside the audio switch circuit, where the first playback loop is used for transmitting the audio signal output by the driving module 100 to the playback end, so that the playback end outside plays audio.

The first switch module of the audio switch circuit of the embodiment consists of discrete devices, and outputs a first blocking trigger signal to the first switch module when the drive module receives the audio blocking signal; when the first switch module receives the first blocking trigger signal, the blocking driving module outputs an audio signal. According to the utility model, the first switch module formed by the discrete devices blocks the driving module to output the audio signal after receiving the first blocking trigger signal, and compared with the prior art that the audio control is performed through the expensive switch chip, the circuit of the embodiment effectively reduces the cost of the audio switch, thereby reducing the cost of the audio control.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a second embodiment of an audio switching circuit according to the present utility model.

Based on the first embodiment described above, in the present embodiment, the first switch module 200 includes the trigger unit 201 and the switch unit 202.

The triggering unit 201 is connected to the driving module 100, the switching unit 202, and the power supply 203, and the switching unit 202 is connected to the driving module 100.

The trigger unit 201 is configured to disconnect a first driving loop between the power supply 203 and the switch unit 202 when the first blocking trigger signal is received.

It should be noted that, the first driving circuit may be a circuit for transmitting a power voltage signal output by the power supply 203, the power voltage signal may be used as a trigger signal of the switching unit 202, and if the switching unit 202 does not receive the power voltage signal, the first playing circuit is turned off.

It is understood that the power supply 203 may be a dc stabilized power supply.

For ease of understanding, the description is with reference to fig. 4, but the present solution is not described. Fig. 4 is a schematic circuit diagram of a first circuit of a trigger unit in a second embodiment of the audio switch circuit according to the present utility model, in which the trigger unit 201 includes: the transistor comprises a first triode Q1, a first resistor R1, a second resistor R2 and a first capacitor C1, wherein the first triode Q1 is a discrete device.

The emitter of the first triode Q1 is connected with the first end of the first capacitor C1 and the first end of the first resistor R1 respectively, the second end of the first capacitor C1 is grounded GND, and the second end of the first resistor R1 is connected with the power supply VDD; the base electrode of the first triode Q1 is connected with the first end of the second resistor R2, and the second end of the second resistor R2 is connected with the driving module 100; the collector of the first triode Q1 is connected to the switching unit 202.

As shown in fig. 4, in the charged state, the first triode Q1 is a PNP transistor, the driving module 100 may output a high-level first blocking signal to the base of the first triode Q1, the emitter of the first triode Q2 is connected to a power supply voltage signal output by the power supply, and the power supply voltage signal is a high-level signal, so that the first triode Q1 is turned off, thereby disconnecting the first driving circuit between the power supply 203 and the switching unit 202.

For ease of understanding, the description is given with reference to fig. 5, but the present solution is not limited thereto. Fig. 5 is a schematic diagram of a second circuit of the triggering unit in the second embodiment of the audio switch circuit of the present utility model, in which the triggering unit 201 further includes: the second transistor Q2 and the third resistor R3.

The collector of the second triode Q2 is connected with the second end of the second resistor R2; the base electrode of the second triode Q2 is connected with the first end of the third resistor R3, and the second end of the third resistor R3 is connected with the driving module 100; the emitter of the second triode Q2 is grounded GND.

As shown in fig. 5, the driving module 100 controls the on and off of the first transistor Q1 through the second transistor Q2, so as to precisely control the first playback loop and improve the efficiency of audio switch control.

In a specific implementation, the second triode Q2 is an NPN transistor, and in a charging state, the driving module 100 may output a low-level first blocking signal to the base of the second triode Q2, and since the base of the second triode Q2 is grounded, the second triode Q2 is turned off, and the base of the first triode Q1 cannot receive the triggering signal and is turned off, so as to disconnect the first driving circuit between the power supply 203 and the switching unit 202.

In the off state, the power supply 300 stops outputting the power supply voltage, and the emitter of the first transistor Q1 does not receive the high-level power supply voltage signal, thereby turning off the first driving circuit between the power supply 203 and the switching unit 202.

The switch unit 202 is configured to disconnect the first playback loop between the driving module 100 and the external playback end when the first driving loop is disconnected, so as to block the driving module from outputting the audio signal.

For ease of understanding, the description is given with reference to fig. 6, but the present solution is not limited thereto. Fig. 6 is a schematic circuit diagram of a switching unit in a second embodiment of the audio switching circuit according to the present utility model, in which the switching unit 202 includes: the MOS transistor comprises a first MOS transistor Q31, a second MOS transistor Q32, a third MOS transistor Q33, a fourth MOS transistor Q34, a fourth resistor R4 and a fifth resistor R5, wherein the first MOS transistor Q31, the second MOS transistor Q32, the third MOS transistor Q33 and the fourth MOS transistor Q34 are all discrete devices.

The grid electrode of the first MOS transistor Q31 is connected to the first end of the fourth resistor 4, the grid electrode of the second MOS transistor Q32 and the collector electrode of the first triode Q1, the source electrode of the first MOS transistor Q31 is connected to the second end of the fourth resistor R4 and the source electrode of the second MOS transistor Q32, the drain electrode of the first MOS transistor Q31 is connected to the driving module 100, and the drain electrode of the second MOS transistor Q32 is connected to the right speaker of the playing end; the grid of third MOS pipe Q33 respectively with fifth resistance R5's first end, the grid of fourth MOS pipe Q34 and the collecting electrode of first triode Q1 is connected, the source of third MOS pipe Q33 respectively with fifth resistance R5's second end and the source of fourth MOS pipe Q34 is connected, the drain of third MOS pipe Q33 with drive module 100 is connected, the drain of fourth MOS pipe Q34 with the left speaker of broadcast end is connected.

It should be noted that, the first switch module 200 is composed of the first triode Q1, the second triode Q2, and the first to fourth MOS transistors Q31 to Q34, which are discrete devices, and can implement the same function as the switch chip, thereby replacing the switch chip and reducing the cost.

It is understood that the first to fourth MOS transistors Q31 to Q34 are all NMOS transistors, and may be voltage-driven NMOS transistors, for example, completely turned on when vgs=1.5.

As shown in fig. 6, the first playing circuit may be a circuit formed by the driving module 100, the first to fourth MOS transistors Q1 to Q4, the right speaker and the left speaker, and when the first driving circuit is turned off, that is, when the first transistor Q1 is turned off, the power supply 203 cannot output the power supply voltage to the gates of the first to fourth MOS transistors Q1 to Q4, and cannot trigger the first to fourth MOS transistors Q1 to Q4 to be turned on, so that the first playing circuit between the driving module 100 and the playing terminal is disconnected.

It can be understood that the right speaker and the left speaker are speakers at the playing end, where the right speaker and the left speaker each include a positive terminal and a negative terminal to receive a positive terminal audio signal and a negative terminal audio signal, the negative terminal of the right speaker and the left speaker are connected with the driving module 100, the driving module directly outputs the right speaker negative terminal audio signal spk_rn to the right speaker negative terminal, outputs the left speaker negative terminal audio signal spk_ln to the left speaker negative terminal, and controls the audio signals input to the positive terminal of the speaker only by the first to fourth MOS transistors Q1 to Q4, that is, the existing switch chip blocks the differential output positive terminal audio signal to block only the positive terminal audio signal, thereby further reducing the cost.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a third embodiment of an audio switch circuit according to the present utility model.

Based on the above embodiments, in this embodiment, after the step S10, the audio switching circuit further includes: and a second switch module 300.

The second switch module 300 is composed of a switch chip, the second switch module 300 is connected with an audio source 400, and the audio source 400 is connected with the driving module 100.

The driving module 100 is further configured to output a first on trigger signal to the second switching module 300 when the audio blocking signal is received.

It should be noted that the first on trigger signal may be a signal that triggers the second switch module 300 to be turned on.

In a specific implementation, in order to enable the playing end to play the audio signal output by the audio source 400 when in the charging state or the shutdown state, the existing part of the switch chip may be reserved, so that the audio signal can still be output after the first switch module 200 is turned off.

The second switch module 300 is configured to turn on a second playback loop between the audio source 400 and the playback end when the first turn-on trigger signal is received.

It should be noted that, the second playback loop may be a loop in which the audio source 400 is directly connected to the playback end, and accordingly, the second switch module 300 may be a switch on the second playback loop in which the audio source 400 and the playback end are directly connected.

For ease of understanding, the description is given with reference to fig. 8, but the present solution is not limited thereto. Fig. 8 is a schematic circuit diagram of a second switch module in a third embodiment of the audio switch circuit of the present utility model, in which the second switch module 300 includes a third switch chip SW3 and a fourth switch chip SW4, the audio source 400 is respectively connected to the driving module 100, the third switch chip SW3 and the fourth switch chip SW4, the third switch chip SW3 is connected to the right speaker, and the fourth switch chip SW4 is connected to the left speaker.

As shown in fig. 8, when the first switch module 200 is turned off, the audio source 400 cannot output an initial audio signal to the driving module 100, and at this time, the driving module 100 can output the low-level trigger signal en_sw3 of the third switch chip and the low-level trigger signal en_sw4 of the fourth switch chip, so that the third switch chip SW3 and the fourth switch chip SW4 are turned on, and a second playback loop between the audio source 400 and the speaker is turned on, and at this time, the audio signal output by the audio source 400 cannot be connected to the amplifying sub-module in the driving module 100, thereby avoiding the problem of nonlinear distortion.

In a specific implementation, an initial audio signal amp_r of a right channel output by the audio source 400 is input to a positive end of a right speaker through the third switch chip SW3, where, because the initial audio signal is not processed by the driving module 100, the positive end audio signal spk_rp of the right speaker is the initial audio signal amp_r of the right channel, and a negative end of the right speaker is grounded through the third switch chip SW3, so that a negative end audio signal spk_rn of the right speaker with a low level is input to the negative end of the right speaker. The initial audio signal amp_l of the left channel output by the audio source 400 is input to the positive end of the left speaker after passing through the third switch chip SW4, where, because the initial audio signal is not processed by the driving module 100, the positive end audio signal spk_lp of the left speaker is the initial audio signal amp_l of the left channel, and the negative end of the left speaker is grounded through the third switch chip SW3, so that the negative end audio spk_ln signal of the left speaker with a low level is input to the negative end of the left speaker, thereby playing the audio signal output by the audio source.

It should be understood that the driving module 100 may be connected to the trigger pins of the third switch chip SW3 and the fourth switch chip SW4 to control the on/off of the third switch chip SW3 and the fourth switch chip SW4 by outputting trigger signals through the trigger pins.

The audio source 400 is configured to output the audio signal to the playing end when the second playing loop is turned on, so that the playing end plays the audio signal.

In a specific implementation, when the first switch module 200 is turned off and the second switch module 300 is turned on, the audio source 400 outputs an audio signal to the playing end through the second playing loop, so that the playing end finishes playing the audio signal in a charging state or a shutdown state.

Further, in order to realize low-cost playing of music, in this embodiment, the driving module 100 is further configured to output a second on trigger signal to the trigger unit 201 when receiving an audio on signal.

It should be noted that the audio on signal may be a signal triggered when the device is in a power-on state.

It is understood that the second on trigger signal may be a trigger signal that triggers the above-mentioned trigger unit 201 to be turned on.

The triggering unit 201 is further configured to, when receiving the second on triggering signal, turn on a first driving loop between the power supply 203 and the switching unit 202, so that the power supply 203 outputs a power triggering signal to the switching unit 202.

The power trigger signal may be a power voltage signal output from the power supply 203.

In a specific implementation, referring to fig. 6, the driving module 100 may output a high-level second on trigger signal to the base of the second triode Q2 in the trigger unit 201, where the base of the second triode Q2 is turned on after receiving the second on trigger signal, so that a low-level signal is input to the base of the first triode Q1, and the first triode is turned on, so that a first driving circuit between the power supply 203 and the switch unit 202 is turned on, and then the power trigger signal output by the power supply 203 is turned on to the switch unit 202.

For ease of understanding, reference may be made to fig. 9, but the present solution is not limited thereto. Fig. 9 is a schematic diagram of a third circuit of a trigger unit in a third embodiment of the audio switch circuit according to the present utility model, in which a base of a first triode Q1 is grounded, a collector of the first triode Q1 is connected to the switch unit 202, an emitter of the first triode Q1 is connected to a first end of a first resistor R1 and a first end of a first capacitor C1, a second end of the first resistor R1 is connected to a power supply VDD, and a second end of the first capacitor C2 is grounded.

As shown in fig. 9, if the audio control device does not need to be inserted into the adapter, the base of the first transistor Q1 in fig. 6 is changed to be grounded in a passive mode, so as to further simplify the circuit and reduce the cost.

The switch unit 202 is configured to, when receiving the power trigger signal, turn on a first playback loop between the driving module 100 and the playback end.

In a specific implementation, referring to fig. 6, in the figure, after the first triode Q1 is turned on, a power trigger signal output by the power supply 203 may be input to the gates of the first to fourth MOS transistors Q31 to Q34, and due to the voltage division between the fourth resistor R4 and the fifth resistor R5, the gate voltages and the source voltages of the first to fourth MOS transistors Q31 to Q34 may reach the fully-on voltage, so that the first to fourth MOS transistors Q31 to Q34 are turned on to the first playback loop, thereby implementing a turn-on and turn-on function, and reducing the cost.

The driving module 100 is further configured to output an audio signal of the audio source 300 to the playing end when the first playing loop is turned on, so that the playing end plays the audio signal.

In a specific implementation, the driving module 100 may perform audio processing and amplification on the initial audio signal output by the audio source 400, and then output the initial audio signal to the playing end through the first playing loop, so that the playing end plays the audio signal, thereby realizing music playing.

Further, in order to avoid that the audio source 400 outputs an audio signal to the playing end through the switch chip in the on state, in this embodiment, the driving module 100 is further configured to output a second blocking trigger signal to the second switch module 300 when receiving an audio on signal.

It should be noted that the second blocking trigger signal may be a signal that triggers the second switch module 300 to be turned off.

In a specific implementation, the audio on signal may be triggered after the audio signal is input to the driving module 100, and after the driving module 100 receives the audio on signal, the second blocking trigger signal may be output to the second switch module 300, so as to control the second switch module 300 to be turned off, so that the audio source 400 is prevented from outputting the audio signal to the playing end through the switch chip in the on state, and the stability of the first playing loop is ensured.

The second switch module 300 is further configured to disconnect a second playback loop between the audio source 400 and the playback end when the second blocking trigger signal is received.

In a specific implementation, as shown in fig. 8, SW3 of the third switch chip is turned off when receiving the trigger signal en_sw3 of the third switch chip, and SW4 of the fourth switch chip is turned off when receiving the trigger signal en_sw4 of the fourth switch chip, so that the second play loop between the audio source 400 and the play end is turned off, and it is ensured that the audio signal of the audio source 400 is stably output from the first play loop to the play end.

In addition, to achieve the above object, an embodiment of the present utility model also proposes an audio switching device including an audio switching circuit as described above.

Other embodiments or specific implementations of the audio switch device of the present utility model may refer to the embodiments of the audio switch described above, and will not be described herein.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The foregoing description is only of the preferred embodiments of the present utility model, and is not intended to limit the scope of the utility model, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims

1. An audio switching circuit, the audio switching circuit comprising: a driving module and a first switch module;

the first switch module consists of discrete devices and is connected with the driving module;

the first switch module is used for blocking the driving module from outputting an audio signal when the first blocking trigger signal is received.

2. The audio switching circuit of claim 1, wherein the first switching module comprises a trigger unit and a switching unit;

the triggering unit is respectively connected with the driving module, the switching unit and the power supply, and the switching unit is connected with the driving module;

and the switch unit is used for disconnecting the first playing loop between the driving module and the external playing end when the first driving loop is disconnected so as to block the driving module from outputting the audio signal.

3. The audio switching circuit of claim 2, wherein the trigger unit comprises: the circuit comprises a first triode, a first resistor, a second resistor and a first capacitor, wherein the first triode is a discrete device;

4. The audio switching circuit of claim 3, wherein the trigger unit further comprises: a second triode and a third resistor;

and the emitter electrode of the second triode is grounded.

5. The audio switching circuit of claim 4 wherein the switching unit comprises: the MOS transistor comprises a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth resistor and a fifth resistor, wherein the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor are all discrete devices;

the grid electrode of the first MOS tube is respectively connected with the first end of the fourth resistor, the grid electrode of the second MOS tube and the collector electrode of the first triode, the source electrode of the first MOS tube is respectively connected with the second end of the fourth resistor and the source electrode of the second MOS tube, the drain electrode of the first MOS tube is connected with the driving module, and the drain electrode of the second MOS tube is connected with the right loudspeaker of the playing end;

the grid of the third MOS tube is respectively connected with the first end of the fifth resistor, the grid of the fourth MOS tube and the collector of the first triode, the source of the third MOS tube is respectively connected with the second end of the fifth resistor and the source of the fourth MOS tube, the drain of the third MOS tube is connected with the driving module, and the drain of the fourth MOS tube is connected with the left loudspeaker of the playing end.

6. The audio switching circuit according to any one of claims 2 to 5, wherein the audio switching circuit further comprises: a second switch module;

the second switch module consists of a switch chip, and is connected with an audio source which is connected with the driving module;

7. The audio switching circuit of claim 6, wherein the driving module is further configured to output a second on trigger signal to the trigger unit upon receiving an audio on signal;

8. The audio switching circuit of claim 7 wherein the driver module is further configured to output a second blocking trigger signal to the second switch module upon receipt of the audio on signal;

9. An audio switching device comprising an audio switching circuit according to any one of claims 1 to 8.