CN111510826A - Circuit and method for eliminating shutdown popping of media playing equipment - Google Patents
Circuit and method for eliminating shutdown popping of media playing equipment Download PDFInfo
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- CN111510826A CN111510826A CN202010435038.7A CN202010435038A CN111510826A CN 111510826 A CN111510826 A CN 111510826A CN 202010435038 A CN202010435038 A CN 202010435038A CN 111510826 A CN111510826 A CN 111510826A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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Abstract
The invention discloses a circuit and a method for eliminating shutdown popping of media playing equipment. An audio module in a media player device may produce an unexpected pop sound when power is lost. An NPN triode switch is arranged between an audio signal output interface and the ground, when the media playing equipment works normally, the NPN triode switch is disconnected, and analog audio signals in a circuit of the media playing equipment are normally output; when the media playing device is shut down, the analog audio signal is changed into an abnormal popping signal, the output unexpected popping signal is pulled to the ground by the NPN triode switch in a saturated mode, the popping signal is enabled to be at a zero level, no signal is output, and no popping is generated. The circuit comprises two PNP triodes, two NPN triodes, an electrolytic capacitor, a current-limiting resistor, a universal diode, a voltage-stabilizing diode and four control resistors. The method of the invention is safe and reliable, and effectively eliminates the popping sound generated when the media playing device is shut down through a simple and stable circuit.
Description
Technical Field
The invention belongs to the technical field of integrated circuit application, relates to a circuit and a method for eliminating unexpected sound generated in chip application, in particular to a circuit and a method for eliminating a power-off popping sound of media playing equipment, and audio signals which cannot be controlled by a chip after the equipment is powered off are eliminated.
Background
Media playing devices (such as various set-top boxes) comprise a large number of digital analog module units, wherein many chips are designed with audio module units for decoding and outputting audio signals. However, in the initial stage of the chip, many designs do not consider how to make the chip not output unexpected sound signals under the condition that the power supply of the chip is lost, so as to ensure that the received audio and video equipment (such as a television and a sound) does not generate unexpected pop sound. The chip design in some cases also considers the problem but the effect is not ideal, and an external circuit needs to be additionally added to the chip to compensate for the electronic product eliminating the popping sound generated outside the design expectation.
Some application layer clients of the audio and video decoding chip have higher requirements on audio and video products which are produced and sold and are oriented to consumers, and the requirement that pop sound which is objectionable to the consumers is not generated when the media playing device is shut down is required.
Disclosure of Invention
One objective of the present invention is to provide a circuit for eliminating the pop sound when the media playing device is turned off, in order to solve the problem that the audio module in the existing media playing device does not consider the unexpected pop sound generated when the power is lost.
The circuit comprises two PNP triodes Q1/Q3, two NPN triodes Q2/Q4, an electrolytic capacitor C, a current-limiting resistor R, a general diode D1, a voltage-stabilizing diode D2 and four control resistors R1/R2/R3/R4; the two PNP triodes are used for voltage comparison, the two NPN triodes are used for controlling connection and disconnection, the four control resistors respectively control the switching of the two PNP triodes and the two NPN triodes, and the electrolytic capacitor is used for charging and storing energy;
the cathode of the universal diode D1 is respectively connected with one end of the current-limiting resistor R, one end of the first control resistor R1 and the anode of the electrolytic capacitor C, and the anode of the universal diode D1 is used as a high-voltage slow-release terminal of the circuit;
the other end of the current-limiting resistor R is respectively connected with the base electrode of the first PNP triode Q1 and the cathode of the voltage stabilizing diode D2, the collector electrode of the first PNP triode Q1 is connected with one end of the second control resistor R2, and the emitter electrode of the first PNP triode Q1 is used as a low-voltage quick-release terminal of the circuit;
the other end of the second control resistor R2 is connected with the base of the first NPN triode Q2, the collector of the first NPN triode Q2 and the other end of the first control resistor R1 are connected with the emitter of the second PNP triode Q3, the base of the second PNP triode Q3 is connected with one end of the third control resistor R3, the collector of the second PNP triode Q3 is connected with one end of the fourth control resistor R4, the other end of the fourth control resistor R4 is connected with the base of the second NPN triode Q4, and the collector of the second NPN triode Q4 is used as the control end of the circuit;
the cathode of the electrolytic capacitor C, the anode of the voltage stabilizing diode D2, the emitter of the first NPN triode Q2, the other end of the third control resistor R3 and the emitter of the second NPN triode Q4 are connected and then grounded.
The invention also provides a method for eliminating shutdown popping of the machine media playing device by using the circuit.
Connecting a high-voltage slow-discharge wire of the circuit with a power supply end with high voltage and slow discharge in a circuit of the media playing equipment; the low-voltage quick-discharge wire is connected with a low-voltage quick-discharge power supply end in the medium playing equipment circuit; the control end is connected with an audio signal output interface of the media playing equipment circuit, and is particularly connected between the analog audio signal output and the audio signal output interface in the media playing equipment circuit.
After the media player circuit is powered on, the power supply terminal with high voltage and slow discharge charges the electrolytic capacitor C quickly through the universal diode D1, then the zener diode D2 is stabilized to the stabilized voltage value of the zener diode through the current limiting resistor R, at this time, the voltage difference between the emitter and the base of the first PNP transistor Q1 is greater than or equal to the threshold of the transistor Q3 itself, the output end of the collector of the transistor Q3 outputs high level, and is added to the first NPN transistor Q2 through the second control resistor R2, so that the transistor Q2 is in saturation conduction under the condition that the collector is connected to the first control resistor R1, the emitter of the second PNP transistor Q3 is pulled to low level, the voltage difference between the emitter and the base of the transistor Q3 is smaller than the threshold of the transistor Q3 itself, the collector of the transistor Q3 outputs low level, the base of the second NPN Q4 is controlled through the fourth control resistor R4, and the transistor Q4 is turned off, the audio signal output interface connected with the collector of the transistor Q4 is not affected by the transistor Q4, and normally outputs signals.
After the media player circuit is powered down, the emitter of the first PNP triode Q1 is connected to the power supply terminal with low voltage and fast discharge, and the base of the first PNP triode Q1 exists due to the unidirectional conductivity of the universal diode D1, so that the voltage of the charging energy storage electrolytic capacitor C is slowly reduced, so that the voltage regulator D2 is maintained at a voltage stabilizing value, the voltage difference between the emitter and the base of the first PNP triode Q1 is smaller than the threshold of the triode Q1, the collector of the triode Q1 outputs a low level, the base of the first triode NPN Q2 is controlled by the second control resistor R2, so that the triode Q2 is turned off, the voltage on the electrolytic capacitor C is added to the emitter of the second PNP triode Q3 through the first control resistor R1, the voltage difference between the emitter and the base of the triode Q3 is larger than or equal to the threshold of the triode Q3, the collector of the triode Q3 outputs a high level, i.e., the pop control high level signal, is applied to the base of the second NPN transistor Q4 through the fourth control resistor R4, causing the transistor Q4 to be saturated and turned on, so that the pop signal output from the audio signal output interface is pulled down to the ground level, eliminating the pop.
The NPN triode switch is arranged between the audio signal output interface and the ground, when the media playing equipment works normally, the NPN triode switch is switched off, and the analog audio signal in the circuit of the media playing equipment is output normally; when the media player is shut down, the analog audio signal is changed into an abnormal popping signal, the unexpected popping signal output by the media player circuit is pulled to the ground by the NPN triode switch in a saturated mode, namely, the popping signal is at a zero level, no signal is output, no audio signal is output to the interface device, and therefore popping is not generated. The method of the invention is safe and reliable, and effectively eliminates the popping sound generated when the media playing device is shut down through a simple and stable circuit.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
As shown in FIG. 1, the circuit for eliminating the shutdown pop of the media player includes two PNP transistors Q1/Q3, two NPN transistors Q2/Q4, an electrolytic capacitor C, a current limiting resistor R, a general diode D1, a voltage stabilizing diode D2, and four control resistors R1/R2/R3/R4. The two PNP triodes are used for voltage comparison, the two NPN triodes are used for controlling connection and disconnection, the four control resistors respectively control the switches of the two PNP triodes and the two NPN triodes, and the electrolytic capacitor is used for charging and storing energy.
The cathode of the general diode D1 is respectively connected with one end of the current-limiting resistor R, one end of the first control resistor R1 and the anode of the electrolytic capacitor C, and the anode of the general diode D1 is used as a high-voltage slow-release terminal of the circuit.
The other end of the current-limiting resistor R is respectively connected with the base electrode of the first PNP triode Q1 and the cathode of the voltage stabilizing diode D2, the collector electrode of the first PNP triode Q1 is connected with one end of the second control resistor R2, and the emitting electrode of the first PNP triode Q1 is used as a low-voltage quick-release terminal of the circuit.
The other end of the second control resistor R2 is connected to the base of the first NPN transistor Q2, the collector of the first NPN transistor Q2 and the other end of the first control resistor R1 are connected to the emitter of the second PNP transistor Q3, the base of the second PNP transistor Q3 is connected to one end of the third control resistor R3, the collector of the second PNP transistor Q3 is connected to one end of the fourth control resistor R4, the other end of the fourth control resistor R4 is connected to the base of the second NPN transistor Q4, and the collector of the second NPN transistor Q4 serves as the control end of the circuit.
The cathode of the electrolytic capacitor C, the anode of the voltage stabilizing diode D2, the emitter of the first NPN triode Q2, the other end of the third control resistor R3 and the emitter of the second NPN triode Q4 are connected and then grounded.
When in use, the high-voltage slow-discharge wire of the circuit is connected with a power supply end with high voltage and slow discharge in a circuit of media playing equipment (such as a set-top box), the low-voltage fast-discharge wire is connected with a power supply end with low voltage and fast discharge in the circuit of the media playing equipment, and the control end of the circuit is connected with an audio signal output interface of the circuit of the media playing equipment and is connected between the analog audio signal output and the audio signal output interface in the circuit of the media playing equipment. The analog audio signal output in the media playing device circuit is connected with the audio signal output interface through the audio output resistor R5, and the control end of the circuit is connected between the audio output resistor R5 and the audio signal output interface.
When the voltage difference between the emitter and the base of the first PNP triode Q1 is greater than or equal to the threshold of the triode Q1, the collector of the triode Q1 outputs high level; when the voltage difference between the emitter and base of the first PNP transistor Q1 is less than the threshold of transistor Q1 itself, the collector of transistor Q1 outputs a low level. When the base electrode of the first NPN triode Q2 is at a high level, the triode Q2 is biased in the forward direction, and the collector electrode and the emitter electrode of the triode Q2 are in saturated communication; when the base of the first NPN transistor Q2 is low, the transistor Q2 is zero biased, and the collector and emitter of the transistor Q2 are off.
When the voltage difference between the emitter and the base of the second PNP triode Q3 is greater than or equal to the threshold of the triode Q3, the collector of the triode Q3 outputs a high level; when the voltage difference between the emitter and the base of the second PNP transistor Q3 is less than the threshold of the transistor Q3 itself, the collector of the transistor Q2 outputs a low level. When the base of the second NPN triode Q4 is at a high level, the triode Q4 is forward biased, and the collector and emitter of the triode Q4 are in saturation communication; when the base of the second NPN transistor Q4 is low, the transistor Q4 is zero biased, and the collector and emitter of the transistor Q4 are off.
The specific method for eliminating shutdown popping of the media playing device by adopting the circuit comprises the following steps:
after the circuit of the media player (such as a set-top box) is powered on, the power supply terminal (generally 12V power supply terminal) with high voltage and slow discharge rapidly charges the electrolytic capacitor C through the universal diode D1, then the zener diode D2 is stabilized to the stabilized value (such as 2.7V, 3.3V, 3.6V) of the zener diode through the current limiting resistor R, at this time, the voltage difference between the emitter and the base of the first PNP triode Q1 is greater than or equal to the threshold of the triode Q3 itself, the collector output terminal of the triode Q3 outputs high level, and the high level is added to the first NPN triode Q2 through the second control resistor R2, so that the triode Q2 is in saturation conduction under the condition that the collector is connected to the first control resistor R1, the emitter of the second PNP triode Q3 is pulled to low level, resulting in that the voltage difference between the emitter and the base of the triode Q3 is less than the threshold of the triode Q3 itself, and the collector, the base electrode of the second NPN triode Q4 is controlled through the fourth control resistor R4, the triode Q4 is turned off and cut off, and an audio signal output interface connected with the collector electrode of the triode Q4 is not influenced by the triode Q4 and outputs signals normally.
After the circuit of the media player (such as a set-top box) is powered down, the emitter of the first PNP triode Q1 is connected to the power supply terminal (generally 3.3V power supply terminal) with low voltage and fast discharge, and the base of the first PNP triode Q1 is connected to the power supply terminal (generally 3.3V power supply terminal), so that the voltage of the charging energy storage electrolytic capacitor C is slowly dropped, so that the voltage regulator D2 is maintained at a stable value, so that the voltage difference between the emitter and the base of the first PNP triode Q1 is smaller than the threshold of the triode Q1 itself, the collector of the triode Q1 outputs low level, the base of the first NPN triode Q2 is controlled by the second control resistor R2, so that the triode Q2 is turned off and cut off, the voltage on the electrolytic capacitor C is applied to the emitter of the second PNP triode Q3 through the first control resistor R1, so that the voltage difference between the emitter and the base of the triode Q3 is larger than or, the collector of the transistor Q3 outputs a high level, i.e. a pop control high level signal, which is applied to the base of the second NPN transistor Q4 through the fourth control resistor R4, causing the transistor Q4 to be in saturation conduction, so that the pop signal output from the audio signal output interface is pulled down to ground, eliminating the pop.
When the popping is not completely eliminated, an oscilloscope is needed to see whether the width of a popping control high-level signal (the measurement point of the oscilloscope is the collector of a triode voltage comparator Q3) covers the width of the popping signal (the measurement point of the popping signal oscilloscope is the collector of a triode switch Q4, and a switch control resistor R4 needs to be disconnected when the test is noticed), when the test shows that the capacitor value of a charging energy storage electrolytic capacitor C needs to be properly increased when the capacitor value is not covered (20% of margin needs to be kept when the capacitor is noticed), and meanwhile, a triode with a larger saturated conduction current, such as SS8050, is needed to be selected, and the ICMAX of the triode is 1.5A.
Because the popping signal generated by the chip is pulled down to the ground plane by the triode switch Q4, no audio signal is output to the interface device, and no popping occurs.
It is to be understood that the above examples are illustrative of the present invention and are not to be construed as limiting the invention, and any invention which does not depart from the spirit and scope of the invention is deemed to be within the scope and spirit of the invention.
Claims (2)
1. Eliminate circuit of media playback devices shutdown plosive, its characterized in that:
the device comprises two PNP triodes Q1/Q3, two NPN triodes Q2/Q4, an electrolytic capacitor C, a current-limiting resistor R, a universal diode D1, a voltage stabilizing diode D2 and four control resistors R1/R2/R3/R4; the two PNP triodes are used for voltage comparison, the two NPN triodes are used for controlling connection and disconnection, the four control resistors respectively control the switching of the two PNP triodes and the two NPN triodes, and the electrolytic capacitor is used for charging and storing energy;
the cathode of the universal diode D1 is respectively connected with one end of the current-limiting resistor R, one end of the first control resistor R1 and the anode of the electrolytic capacitor C, and the anode of the universal diode D1 is used as a high-voltage slow-release terminal of the circuit;
the other end of the current-limiting resistor R is respectively connected with the base electrode of the first PNP triode Q1 and the cathode of the voltage stabilizing diode D2, the collector electrode of the first PNP triode Q1 is connected with one end of the second control resistor R2, and the emitter electrode of the first PNP triode Q1 is used as a low-voltage quick-release terminal of the circuit;
the other end of the second control resistor R2 is connected with the base of the first NPN triode Q2, the collector of the first NPN triode Q2 and the other end of the first control resistor R1 are connected with the emitter of the second PNP triode Q3, the base of the second PNP triode Q3 is connected with one end of the third control resistor R3, the collector of the second PNP triode Q3 is connected with one end of the fourth control resistor R4, the other end of the fourth control resistor R4 is connected with the base of the second NPN triode Q4, and the collector of the second NPN triode Q4 is used as the control end of the circuit;
the cathode of the electrolytic capacitor C, the anode of the voltage stabilizing diode D2, the emitter of the first NPN triode Q2, the other end of the third control resistor R3 and the emitter of the second NPN triode Q4 are connected and then grounded.
2. The method for eliminating the power-off popping of the media player by using the circuit of claim 1, wherein:
the high-voltage slow-discharge wire of the circuit is connected with a power supply end with high voltage and slow discharge in the circuit of the media playing device, the low-voltage fast-discharge wire is connected with a power supply end with low voltage and fast discharge in the circuit of the media playing device, and the control end is connected with an audio signal output interface of the circuit of the media playing device;
after the media player circuit is powered on, the power supply terminal with high voltage and slow discharge charges the electrolytic capacitor C quickly through the universal diode D1, then the zener diode D2 is stabilized to the stabilized voltage value of the zener diode through the current limiting resistor R, at this time, the voltage difference between the emitter and the base of the first PNP transistor Q1 is greater than or equal to the threshold of the transistor Q3 itself, the output end of the collector of the transistor Q3 outputs high level, and is added to the first NPN transistor Q2 through the second control resistor R2, so that the transistor Q2 is in saturation conduction under the condition that the collector is connected to the first control resistor R1, the emitter of the second PNP transistor Q3 is pulled to low level, the voltage difference between the emitter and the base of the transistor Q3 is smaller than the threshold of the transistor Q3 itself, the collector of the transistor Q3 outputs low level, the base of the second NPN Q4 is controlled through the fourth control resistor R4, and the transistor Q4 is turned off, the audio signal output interface connected with the collector of the triode Q4 is not influenced by the triode Q4 and normally outputs signals;
after the media player circuit is powered down, the emitter of the first PNP triode Q1 is connected to the power supply terminal with low voltage and fast discharge, and the base of the first PNP triode Q1 exists due to the unidirectional conductivity of the universal diode D1, so that the voltage of the charging energy storage electrolytic capacitor C is slowly reduced, so that the voltage regulator D2 is maintained at a voltage stabilizing value, the voltage difference between the emitter and the base of the first PNP triode Q1 is smaller than the threshold of the triode Q1, the collector of the triode Q1 outputs a low level, the base of the first triode NPN Q2 is controlled by the second control resistor R2, so that the triode Q2 is turned off, the voltage on the electrolytic capacitor C is added to the emitter of the second PNP triode Q3 through the first control resistor R1, the voltage difference between the emitter and the base of the triode Q3 is larger than or equal to the threshold of the triode Q3, the collector of the triode Q3 outputs a high level, i.e., the pop control high level signal, is applied to the base of the second NPN transistor Q4 through the fourth control resistor R4, causing the transistor Q4 to be saturated and turned on, so that the pop signal output from the audio signal output interface is pulled down to the ground level, eliminating the pop.
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| CN202010435038.7A CN111510826B (en) | 2020-05-21 | 2020-05-21 | Circuit and method for eliminating shutdown pop sound of media playing device |
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| CN202010435038.7A CN111510826B (en) | 2020-05-21 | 2020-05-21 | Circuit and method for eliminating shutdown pop sound of media playing device |
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| CN1192083A (en) * | 1997-02-26 | 1998-09-02 | 汤姆森多媒体公司 | Anti-pop for power off |
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|---|---|
| CN111510826B (en) | 2024-05-31 |
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