CN114567848A - Audio output channel state detection device and method - Google Patents
Audio output channel state detection device and method Download PDFInfo
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Abstract
The invention relates to the technical field of audio playing, and provides an audio output channel state detection device and method, wherein a switching module is taken as a core, a channel switching mechanism is established, and an audio playing module and an audio output module are conducted when an audio signal is normally output; when fault detection is needed to be carried out on the output channel, the switching module is controlled to conduct the audio playing module and the signal acquisition module to carry out signal acquisition, so that the state of the audio output channel can be detected when the power is turned on, output can be timely turned off after abnormity is detected, and influence on user experience caused by noise output to a rear-stage power amplifier is avoided.
Description
Technical Field
The invention relates to the technical field of audio playing, in particular to a device and a method for detecting the state of an audio output channel.
Background
Today, audio output devices (such as earphones, microphones, voice chips, and the like) are indispensable in current terminal equipment, and audio output devices are needed for calling, sending voice, watching movies, listening to music, and the like, and the frequency of use in daily life is very high, so that the audio output devices in the terminal equipment often break down, and the effect of audio playing is affected.
Audio output has been widely used in various electronic products, such as vehicle multimedia, television, power amplifier, etc. At present, a common circuit is only provided with a mute control circuit during output so as to realize output mute control; however, if the output is short-circuited, the sound cannot be MUTE, so that the problems of current sound and the like will occur in the output audio sound, the circuit may be seriously damaged, the output cannot be effectively turned off, and the equipment failure problems such as device damage and the like are generated, thereby affecting the user experience. The existing audio output inspection mode is generally time-consuming and high in labor cost, and partial circuit faults are not easy to find by naked eyes or can be detected by professional personnel, so that partial equipment faults cannot be found and removed in time, and the experience and revenue of customers are influenced.
Disclosure of Invention
The invention provides a device and a method for detecting the state of an audio output channel, which solve the technical problems of unsatisfactory audio output efficiency and equipment damage caused by the fact that the conventional audio output device lacks an effective fault detection module and cannot detect the fault of the audio output channel in time.
In order to solve the technical problems, the invention provides an audio output channel state detection device, which comprises an MCU (microprogrammed control unit), a switching module, a control signal output module and a signal acquisition module; the switching module is connected with the control signal output module, the signal acquisition module, the audio playing module and the audio output module, and the MCU is connected with the control signal output module and the signal acquisition module; the switching module comprises an audio input end and an audio output end;
The audio input end is connected with the audio output module and is used for receiving an audio signal to be played;
the audio output end is connected with the audio playing module and is used for outputting the audio signal to the audio playing module for audio playing;
the control signal output module is used for receiving and responding to the control signal of the MCU, and further outputting a conduction signal to control the switching module to conduct the audio playing module and the signal acquisition module;
the signal acquisition module is used for acquiring signals of the audio playing module and feeding back the acquired detection signals to the MCU;
and the MCU is used for determining whether the audio output module has a fault according to the detection signal.
The basic scheme takes a switching module as a core, establishes a channel switching mechanism, and conducts an audio playing module and an audio output module when an audio signal is normally output; when fault detection is needed to be carried out on the output channel, the switching module is controlled to conduct the audio playing module and the signal acquisition module to carry out signal acquisition, so that the state of the audio output channel can be detected when the power is turned on, output can be timely turned off after abnormity is detected, and influence on user experience caused by noise output to a rear-stage power amplifier is avoided.
In a further embodiment, the switching module is three groups of 2-to-1 bidirectional analog switches, including a first to a sixth independent I/O terminals, and a first to a third selection input terminals, a first to a third common I/O terminals, which are sequentially divided into 3 groups of identical multi-way selection switches;
the first independent I/O end and the third independent I/O end are respectively used as a right sound channel input end and a left sound channel input end and are connected with an audio output module, the second independent I/O end is in short circuit with the sixth independent I/O end, and the fourth independent I/O end is in short circuit with the fifth independent I/O end;
the first to third selective input ends are connected with the MCU through the control signal output module;
the first shared I/O end and the second shared I/O end are respectively used as a right sound channel output end and a left sound channel output end and are connected with an audio playing module; the third shared I/O end is connected with the MCU through the signal acquisition module;
during normal output, the MCU controls the first selection input end and the second selection input end to be at low level, the first shared I/O end and the first independent I/O end, the second shared I/O end and the third independent I/O end are conducted, and audio signals are normally output to the audio playing module for audio playing;
When the fault diagnosis mode is entered, the MCU controls the first to third selection input ends to be high level, switches on the third common I/O end and the sixth independent I/O end, and accesses the right sound channel output end to the signal acquisition module; and then the MCU controls the third selection input end to be at a low level, the third common I/O end and the fifth independent I/O end are conducted, and the left sound channel output end is connected to the signal acquisition module.
In a further embodiment, the switching module is CD 4053.
This scheme adopts three 2 of group to select 1 two-way analog switch as switching module, utilizes its switch switching function, can control right channel output through MCU's signal control, left channel output inserts audio playback module or signal acquisition module, under the prerequisite that does not influence audio signal's normal output circuit, through changing the input level height of first selection input ~ third selection input, can carry out the passageway and switch, switch efficiently, the circuit security is high.
In a further embodiment, the control signal output module includes first to fourth resistors; one end of the first resistor is connected to a power supply end, and the other end of the first resistor is connected with the first selection input end, the second selection input end and the MCU through a third resistor; one end of the second resistor is connected to a power supply end, the other end of the second resistor is connected to the third selection input end, and the second resistor is further connected with the MCU through a fourth resistor.
In a further embodiment, the signal acquisition module includes fifth to seventh resistors, one end of the fifth resistor is connected to a power supply terminal, and the other end of the fifth resistor is connected to the third common I/O terminal, and is further connected to the MCU through a sixth resistor and grounded through the seventh resistor.
This scheme is according to the difference of the equivalent circuit of right track output, left track output under the different states, and the voltage acquisition circuit that the configuration corresponds can analyze out the corresponding state of right track output, left track output through the voltage value that the analysis was gathered, and fault detection efficiency is high, the circuit security is high.
In a further embodiment, the present invention further comprises a filter circuit comprising a first capacitor, a second capacitor; the first capacitor is connected in series between the right channel output end and the first common I/O end; the second capacitor is connected in series between the left channel output end and the second common I/O end.
In further embodiments, the signal acquisition module further comprises an eighth resistor and a ninth resistor; the eighth resistor is connected in series between the right channel output terminal and the first common I/O terminal, and the ninth resistor is connected in series between the left channel output terminal and the second common I/O terminal.
The scheme sets sampling resistors (an eighth resistor and a ninth resistor) connected with the right sound channel output end and the left sound channel output end in series, and the sampling resistors are matched with voltage detection of fifth resistors R5-seventh resistors R7, so that different states of the right sound channel output end and the left sound channel output end can be accurately detected.
The invention also provides a method for detecting the state of the audio output channel, and the device for detecting the state of the audio output channel comprises the following steps:
s1, the MCU controls the switching module to enter a first diagnosis mode, conducts the right sound channel output end and the signal acquisition module, and acquires a first circuit voltage of the right sound channel output end;
s2, the MCU controls the switching module to enter a second diagnosis mode, conducts the left sound channel output end and the signal acquisition module, and acquires a second circuit voltage of the left sound channel output end;
and S3, the MCU judges whether the right sound channel output end is in fault according to the first circuit voltage, and judges whether the left sound channel output end is in fault according to the second circuit voltage.
In a further embodiment, the switching module employs three sets of 1-out-of-2 bidirectional analog switches model CD 4053.
In a further embodiment, the present invention further comprises: and S0, pre-calculating a corresponding voltage range according to the state of the audio output channel, generating a state comparison table and storing the state comparison table in the MCU.
According to the scheme, the corresponding voltage range is calculated in advance according to the state of the audio output channel, the state comparison table is generated and stored in the MCU, when the sampling signal is obtained, the state of the corresponding audio output channel can be rapidly determined, and the fault detection efficiency is effectively improved.
Drawings
Fig. 1 is a system framework diagram of an apparatus for detecting a state of an audio output channel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the port connection of FIG. 1 provided by an embodiment of the present invention;
fig. 3 is an equivalent circuit diagram of the signal acquisition module when the left channel input end normally outputs according to the embodiment of the present invention;
fig. 4 is an equivalent circuit diagram of the signal acquisition module when the input end of the left channel is short-circuited to ground according to the embodiment of the present invention;
fig. 5 is an equivalent circuit diagram of the signal acquisition module when the input end of the left channel is open according to the embodiment of the present invention;
wherein: the device comprises an MCU1, a switching module 2, a control signal output module 3, a signal acquisition module 4, an audio playing module 5 and an audio output module 6; a RIGHT channel input terminal AUDIO _ R, a LEFT channel input terminal AUDIO _ L, a RIGHT channel output terminal AUDIO _ RIGHT, and a LEFT channel output terminal AUDIO _ LEFT.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which are given solely for the purpose of illustration and are not to be construed as limitations of the invention, including the drawings which are incorporated herein by reference and for illustration only and are not to be construed as limitations of the invention, since many variations thereof are possible without departing from the spirit and scope of the invention.
Example 1
As shown in fig. 1 and 2, the audio output channel state detection device provided in the embodiment of the present invention includes an MCU1, a switching module 2 (e.g., U1 in fig. 1), a control signal output module 3, and a signal acquisition module 4; the switching module 2 is connected with the control signal output module 3, the signal acquisition module 4, the audio playing module 5 and the audio output module 6, and the MCU1 is connected with the control signal output module 3 and the signal acquisition module 4; the switching module 2 includes an AUDIO input terminal (AUDIO _ R, AUDIO _ L in fig. 2), an AUDIO output terminal (AUDIO _ RIGHT, AUDIO _ LEFT in fig. 2);
in an actual application scenario, the fault detection circuit provided in this embodiment can selectively access the audio output circuit according to the actual scenario, and is not limited to this embodiment.
The audio input end is connected with the audio output module 6 and used for receiving an audio signal to be played;
the audio output end is connected with the audio playing module 5 and is used for outputting the audio signal to the audio playing module 5 for audio playing;
the control signal output module 3 is used for receiving and responding to the control signal of the MCU1, and further outputting a conduction signal to control the switching module 2 to conduct the signal acquisition module 4 and the audio playing module 5;
The signal acquisition module 4 is used for acquiring signals of the audio playing module 5 and feeding back the acquired detection signals to the MCU 1;
the MCU1 is used for determining whether the audio output module 6 is faulty according to the detection signal.
In this embodiment, the switching module 2 is a three-group 2-to-1 bidirectional analog switch, and includes a first independent I/O terminal 1Y0 to a sixth independent I/O terminal 3Y1 (sequentially 1YO, 1Y1, 2YO, 2Y1, 3YO, 3Y1 in fig. 1 and 2), a first selection input terminal S1 to a third selection input terminal S3 (sequentially S1, S2, S3 in fig. 1 and 2), and a first common I/O terminal 1Z to a third common I/O terminal 3Z (sequentially 1Z, 2Z, 3Z in fig. 1 and 2), which are sequentially divided into 3 groups of the same multi-path selection switches;
the first independent I/O end 1Y0 and the third independent I/O end 2Y0 are respectively used as a right channel input end AUDIO _ R and a left channel input end AUDIO _ L and are connected with the AUDIO output module 6, the second independent I/O end 1Y1 is in short circuit with the sixth independent I/O end 3Y1, and the fourth independent I/O end 2Y1 is in short circuit with the fifth independent I/O end 3Y 0;
the first selection input end S1 to the third selection input end S3 are connected with the MCU1 through the control signal output module 3;
the first common I/O terminal 1Z and the second common I/O terminal 2Z are respectively used as a RIGHT sound channel output end AUDIO _ RIGHT and a LEFT sound channel output end AUDIO _ LEFT and are connected with the AUDIO playing module 5; the third common I/O terminal 3Z is connected with the MCU1 through the signal acquisition module 4;
VEE of the switching module 2 is grounded through a third capacitor C3 and connected with a sixth resistor R6, and VCC is connected with a 5V power supply end and is grounded through a fourth capacitor.
During normal output, the MCU1 controls the first selection input terminal S1 and the second selection input terminal S2 to be at low level, and turns on the first common I/O terminal 1Z and the first independent I/O terminal 1Y0, the second common I/O terminal 2Z and the third independent I/O terminal 2Y0, so that the audio signal is normally output to the audio playing module 5 for audio playing;
when the vehicle enters the fault diagnosis mode, the MCU1 controls the first to third selection input terminals S1 to S3 to be at a high level, turns on the third common I/O terminal 3Z and the sixth independent I/O terminal 3Y1, connects the RIGHT channel output terminal AUDIO _ RIGHT to the signal acquisition module 4, and the MCU1 reads the state of the RIGHT channel output terminal AUDIO _ RIGHT (at this time, the MCU1 reads the state of the 1Z output channel); preferably, the MCU1 reads the value of the third common I/O terminal 3Z (i.e., the voltage value collected from the LINEOUT _ DET) 20ms after the signals of the first to third select inputs S1-S3 (S1, S2, S3) are ready.
Subsequently, the MCU1 controls the third selection input terminal S3 to be at a low level, turns on the third common I/O terminal 3Z and the fifth independent I/O terminal 3Y0, connects the LEFT channel output terminal AUDIO _ LEFT to the signal acquisition module 4, and the MCU1 reads the state of the LEFT channel output terminal AUDIO _ LEFT (at this time, the MCU1 reads the state of the 2Z output channel). Preferably, the MCU1 reads the value of the third common I/O terminal 3Z 20ms after the signals of the first to third selection input terminals S1 to S3(S1, S2, S3) are ready.
In this embodiment, three sets of 1-out-of-2 bidirectional analog switches of model CD4053 are used as the switching module 2. And the analog switches of other models can be selected according to actual requirements.
In this embodiment, three sets of two-way analog switches of 2-to-1 are used as the switching module 2, and the switch switching function is utilized, so that the RIGHT channel output terminal AUDIO _ RIGHT and the LEFT channel output terminal AUDIO _ LEFT can be controlled to access the AUDIO output module 6 or the signal acquisition module 4 by the signal control of the MCU1, and on the premise of not affecting the normal output loop of the AUDIO signal, the channel switching can be performed by changing the levels of the input levels of the first selection input terminal S1 to the third selection input terminal S3, so that the switching efficiency is high, and the circuit safety is high.
In this embodiment, the control signal output module 3 includes a first resistor R1 to a fourth resistor R4; one end of the first resistor R1 is connected to a power supply end, and the other end is connected with the first selection input end S1, the second selection input end S2 and the MCU1 through a third resistor R3; one end of the second resistor R2 is connected to a power supply end, the other end of the second resistor R2 is connected to the third selection input end S3, and the second resistor R4 is connected to the MCU 1.
In this embodiment, the signal acquisition module 4 includes fifth to seventh resistors R5 to R7, one end of the fifth resistor R5 is connected to the power supply terminal, and the other end is connected to the third common I/O terminal 3Z, and is further connected to the MCU1 through a sixth resistor R6 and is grounded through the seventh resistor R7.
In this embodiment, the signal acquisition module 4 further includes an eighth resistor R8 and a ninth resistor R9; the eighth resistor R8 is connected in series between the RIGHT channel output terminal AUDIO _ RIGHT and the first common I/O terminal 1Z, and the ninth resistor R9 is connected in series between the LEFT channel output terminal AUDIO _ LEFT and the second common I/O terminal 2Z.
In this embodiment, sampling resistors (an eighth resistor R8 and a ninth resistor R9) connected in series with the RIGHT channel output terminal AUDIO _ RIGHT and the LEFT channel output terminal AUDIO _ LEFT are provided, and different states of the RIGHT channel output terminal AUDIO _ RIGHT and the LEFT channel output terminal AUDIO _ LEFT can be accurately detected by matching voltage detection of the fifth resistor R5 to the seventh resistor R7.
Taking the left channel input end as an example, the judgment voltage of the audio output channel in various states is calculated as follows:
1) the audio output channel is normal, and the equivalent circuit thereof is shown in FIG. 3;
it can be seen that the acquisition voltage of LINEOUT _ DET is:
Vd1＝3.3*[(R8+RL)//R4)]/{R1+[(R8+RL)//R4)]}。
2) the audio output channel is short-circuited to ground, and when the audio output channel is short-circuited to ground, the equivalent circuit of the audio output channel is shown in fig. 4;
it can be seen that the acquisition voltage of LINEOUT _ DET is:
Vd2＝3.3*(R8//R4)/[R1+(R8//R4)]。
3) the audio output channel is open, and the equivalent circuit thereof is shown in fig. 5;
it can be seen that the acquisition voltage of LINEOUT _ DET is:
Vd3＝3.3*(R1/(R1+R4)。
in this embodiment, corresponding voltage acquisition circuits are configured according to the difference between equivalent circuits of the RIGHT channel output end AUDIO _ RIGHT and the LEFT channel output end AUDIO _ LEFT in different states, and the corresponding states of the RIGHT channel output end AUDIO _ RIGHT and the LEFT channel output end AUDIO _ LEFT can be analyzed by analyzing the acquired voltage values, so that the fault detection efficiency is high, and the circuit safety is high.
In this embodiment, the present invention further includes a filter circuit, where the filter circuit includes a first capacitor C1 and a second capacitor C2; the first capacitor C1 is connected in series between the RIGHT channel output terminal AUDIO _ RIGHT and the first common I/O terminal 1Z; the second capacitor C2 is connected in series between the LEFT channel output terminal AUDIO _ LEFT and the second common I/O terminal 2Z.
In the embodiment of the invention, the switching module 2 is taken as a core, a channel switching mechanism is established, and the audio playing module 5 and the audio output module 6 are conducted when the audio signal is normally output; when fault detection is needed to be carried out on the output channel, the switching module 2 is controlled to conduct the signal acquisition module 4 and the audio playing module 5 to carry out signal acquisition, so that the state of the audio output channel can be detected when the television is started, output can be timely closed after abnormity is detected, and influence on user experience caused by noise output to a rear-stage power amplifier is avoided.
Example 2
The present invention further provides a method for detecting an audio output channel state, which uses the apparatus for detecting an audio output channel state in embodiment 1, and includes steps S0 to S3:
and S0, pre-calculating a corresponding voltage range according to the state of the audio output channel, generating a state comparison table and storing the state comparison table in the MCU 1.
For example, the audio output channel state corresponding to the voltage range of the third common I/O terminal is set in combination with the circuit parameter error Δ V;
1) vd1+ Δ V1-Vd 2+ Δ V2: the audio output channel is normal;
2) less than Vd1+ Δ V1: the audio output channel is short-circuited to ground;
3) vd2+ Δ V2-Vd 3+ Δ V3: the audio output channel is open;
4) greater than Vd3+ Δ V3: the audio output channel is short-circuited to B + (the positive electrode of the vehicle-mounted battery).
The Δ V1, Δ V2, and Δ V3 may be set according to an actual circuit.
S1 and the MCU1 control the switching module 2 to enter a first diagnosis mode, conduct the RIGHT channel output terminal AUDIO _ RIGHT and the signal acquisition module 4, and acquire a first circuit voltage of the RIGHT channel output terminal AUDIO _ RIGHT;
s2 and the MCU1 controls the switching module 2 to enter a second diagnosis mode, conducts the LEFT channel output terminal AUDIO _ LEFT and the signal acquisition module 4, and acquires a second circuit voltage of the LEFT channel output terminal AUDIO _ LEFT;
and S3, the MCU1 judges whether the RIGHT channel output terminal AUDIO _ RIGHT has a fault according to the first circuit voltage, and judges whether the LEFT channel output terminal AUDIO _ LEFT has a fault according to the second circuit voltage.
According to the embodiment, the corresponding voltage range is calculated in advance according to the state of the audio output channel, the state comparison table is generated and stored in the MCU1, when the sampling signal is acquired, the state of the corresponding audio output channel can be rapidly determined, and the fault detection efficiency is effectively improved.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. An audio output channel state detection device, characterized in that: the device comprises an MCU, a switching module, a control signal output module and a signal acquisition module; the switching module is connected with the control signal output module, the signal acquisition module, the audio playing module and the audio output module, and the MCU is connected with the control signal output module and the signal acquisition module; the switching module comprises an audio input end and an audio output end;
the audio input end is connected with the audio output module and used for receiving an audio signal to be played;
the audio output end is connected with the audio playing module and used for outputting the audio signal to the audio playing module for audio playing;
the control signal output module is used for receiving and responding to the control signal of the MCU, and further outputting a conduction signal to control the switching module to conduct the audio playing module and the signal acquisition module;
The signal acquisition module is used for acquiring signals of the audio playing module and feeding back the acquired detection signals to the MCU;
and the MCU is used for determining whether the audio output module has a fault according to the detection signal.
2. An audio output channel state detecting device according to claim 1, wherein: the switching module is three groups of 2-to-1 bidirectional analog switches, which comprise a first independent I/O end to a sixth independent I/O end, a first selection input end to a third selection input end, a first shared I/O end to a third shared I/O end, and are sequentially divided into 3 groups of same multi-path selection switches;
the first independent I/O end and the third independent I/O end are respectively used as a right track input end and a left track input end and are connected with an audio output module, the second independent I/O end is in short circuit with the sixth independent I/O end, and the fourth independent I/O end is in short circuit with the fifth independent I/O end;
the first selection input end to the third selection input end are connected with the MCU through the control signal output module;
the first shared I/O end and the second shared I/O end are respectively used as a right sound channel output end and a left sound channel output end and are connected with an audio playing module; the third shared I/O end is connected with the MCU through the signal acquisition module;
During normal output, the MCU controls the first selection input end and the second selection input end to be at low level, the first shared I/O end and the first independent I/O end, the second shared I/O end and the third independent I/O end are conducted, and audio signals are normally output to the audio playing module for audio playing;
when the fault diagnosis mode is entered, the MCU controls the first to third selection input ends to be high level, switches on the third common I/O end and the sixth independent I/O end, and accesses the right sound channel output end to the signal acquisition module; and then the MCU controls the third selection input end to be at a low level, the third common I/O end and the fifth independent I/O end are conducted, and the left sound channel output end is connected to the signal acquisition module.
3. An audio output channel state detecting device according to claim 2, wherein: the switching module is CD 4053.
4. An audio output channel state detecting device according to claim 2, wherein: the control signal output module comprises a first resistor, a second resistor, a third resistor and a fourth resistor; one end of the first resistor is connected to a power supply end, and the other end of the first resistor is connected with the first selection input end, the second selection input end and the MCU through a third resistor; one end of the second resistor is connected to a power supply end, the other end of the second resistor is connected to the third selection input end, and the second resistor is further connected with the MCU through a fourth resistor.
5. An audio output channel state detecting device according to claim 2, wherein: the signal acquisition module comprises fifth to seventh resistors, one end of the fifth resistor is connected to a power supply end, the other end of the fifth resistor is connected with the third shared I/O end, and the fifth resistor is connected with the MCU through a sixth resistor and grounded through the seventh resistor.
6. The audio output channel state detecting device as claimed in claim 5, wherein: the signal acquisition module further comprises an eighth resistor and a ninth resistor; the eighth resistor is connected in series between the right channel output terminal and the first common I/O terminal, and the ninth resistor is connected in series between the left channel output terminal and the second common I/O terminal.
7. An audio output channel state detecting device according to claim 5 or 6, wherein: the filter circuit comprises a first capacitor and a second capacitor; the first capacitor is connected in series between the right channel output end and the first common I/O end; the second capacitor is connected in series between the left channel output end and the second common I/O end.
8. A method for detecting the state of an audio output channel, which comprises the steps of:
S1, the MCU controls the switching module to enter a first diagnosis mode, conducts the output end of the right sound channel and the signal acquisition module, and acquires a first circuit voltage at the input end of the right sound channel;
s2, the MCU controls the switching module to enter a second diagnosis mode, conducts the output end of the left sound channel and the signal acquisition module, and acquires a second circuit voltage at the input end of the left sound channel;
and S3, the MCU judges whether the right channel output end is in fault according to the first circuit voltage, and judges whether the left channel output end is in fault according to the second circuit voltage.
9. The audio output channel state detection method of claim 8, further comprising: and S0, pre-calculating a corresponding voltage range according to the state of the audio output channel, generating a state comparison table and storing the state comparison table in the MCU.
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