CN110234052B - 2.1 Sound track hand-held sound-amplifying microphone - Google Patents
2.1 Sound track hand-held sound-amplifying microphone Download PDFInfo
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- CN110234052B CN110234052B CN201910664257.XA CN201910664257A CN110234052B CN 110234052 B CN110234052 B CN 110234052B CN 201910664257 A CN201910664257 A CN 201910664257A CN 110234052 B CN110234052 B CN 110234052B
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- 239000003990 capacitor Substances 0.000 claims description 57
- 230000005236 sound signal Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000003321 amplification Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Classifications
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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
- H04R5/00—Stereophonic arrangements
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
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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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/08—Microphones
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention relates to a 2.1 sound channel handheld sound amplifying microphone which comprises a handheld handle, a sound emitting main body and a sound pickup. The sound emitting main body comprises a shell, a left channel full-frequency loudspeaker, a right channel full-frequency loudspeaker, a middle-high frequency loudspeaker and a control circuit; the first mounting hole, the second mounting hole and the third mounting hole are sequentially formed in the shell along the circumferential direction, and the first mounting hole and the third mounting hole are positioned on two opposite sides of the shell; the left channel full-frequency loudspeaker and the right channel full-frequency loudspeaker are respectively arranged in the first mounting hole and the third mounting hole, and the middle-high frequency loudspeaker is arranged in the second mounting hole. When the voice amplifier is held by hands, sound production is carried out on the left side, the right side and the front side, the control circuit is added with the high-pass filter circuit, the intermediate-frequency gain circuit and the sound mixing circuit, the voice signals picked up by the pickup are subjected to signal processing and input into the mono-mid-set power amplifier to be subjected to power amplification driving of the mid-high-frequency loudspeaker, so that a listener in front of a sounder can obtain a sound expansion effect which is clear enough and has a certain sound pressure.
Description
Technical Field
The present invention relates to hand-held speech microphones and, more particularly, to a 2.1 channel hand-held speech microphone.
Background
At present, the known handheld sound amplifying microphone comprises a moving coil type sound pick-up, a battery, a power amplification board, a handheld shell, two full-frequency loudspeakers and an effect of amplifying sound. The voice enters the power amplification board through the pickup to amplify power and then drives the loudspeaker to amplify sound.
However, due to the limitation of the structure, two full-frequency speakers are usually placed on the left and right sides of the housing, so that the sound expansion range is very weak right in front of the speaker, and it is difficult to achieve a perfect sound expansion effect.
Disclosure of Invention
The invention aims to provide a 2.1-channel handheld sound-amplifying microphone.
The technical scheme adopted for solving the technical problems is as follows: a 2.1 sound channel handheld sound amplifying microphone is constructed, and comprises a handheld handle, a sound emitting main body and a sound pickup;
the sound emitting main body comprises a shell, a left channel full-frequency loudspeaker, a right channel full-frequency loudspeaker, a middle-high frequency loudspeaker and a control circuit;
The shell is provided with a first mounting hole, a second mounting hole and a third mounting hole in sequence along the circumferential direction, and the first mounting hole and the third mounting hole are positioned on two opposite sides of the shell; the left channel full-frequency loudspeaker and the right channel full-frequency loudspeaker are respectively arranged in the first mounting hole and the third mounting hole so as to sound outwards from two opposite sides of the shell, and the middle-high frequency loudspeaker is arranged in the second mounting hole;
The control circuit comprises a pickup circuit, a full-frequency gain circuit, a double-channel full-frequency power amplifier, a sound mixing circuit, a high-pass filter circuit, an intermediate-frequency gain circuit and a mono-channel middle-set power amplifier;
the sound pickup circuit is electrically connected with the sound pickup, and the full-frequency gain circuit and the sound mixing circuit are respectively and electrically connected with the sound pickup circuit;
the two-channel full-frequency power amplifier is electrically connected with the full-frequency gain circuit, the left-channel full-frequency loudspeaker and the right-channel full-frequency loudspeaker are respectively and effectively connected with the two-channel full-frequency power amplifier, and the two-channel full-frequency power amplifier receives the audio signals processed by the full-frequency gain circuit and drives the left-channel full-frequency loudspeaker and the right-channel full-frequency loudspeaker to sound;
The audio mixing circuit is further electrically connected with the full-frequency gain circuit, the high-pass filter circuit is connected with the audio mixing circuit, the intermediate frequency gain circuit is connected with the high-pass filter circuit, the mono-channel mid-set power amplifier is electrically connected with the intermediate frequency gain circuit, the mid-high frequency loudspeaker is electrically connected with the mono-channel mid-set power amplifier, and the mono-channel mid-set power amplifier receives the audio signal processed by the full-frequency gain circuit and drives the mid-high frequency loudspeaker to sound.
Preferably, the control circuit further includes a bluetooth receiving decoding and DSP processing controller connected between the sound pickup circuit and the full frequency gain circuit to decode and process the received audio signal for transmission to the full frequency gain circuit.
Preferably, the sound emitting main body further comprises three mounting seats for mounting the left channel full-frequency speaker, the right channel full-frequency speaker and the middle-high frequency speaker respectively, and sound emitting holes are formed in the middle of each mounting seat for the left channel full-frequency speaker, the right channel full-frequency speaker and the middle-high frequency speaker to emit sound;
The mounting seat is detachably mounted on the outer side of the shell, and the left channel full-frequency loudspeaker, the right channel full-frequency loudspeaker and the middle-high frequency loudspeaker extend into the shell from the first mounting hole, the second mounting hole and the third mounting hole respectively.
Preferably, the sounding main body is further provided with an operation panel for controlling playing.
Preferably, the operation panel is located at a side of the housing opposite to the second mounting hole, and the operation panel is detachably mounted on the housing.
Preferably, a power supply is arranged in the hand-held handle to supply power to the left channel full-frequency speaker, the right channel full-frequency speaker, the middle-high frequency speaker and the control circuit.
Preferably, the power supply is cylindrical, and a battery compartment for installing the power supply is formed in the handheld handle.
Preferably, the audio mixing circuit includes a capacitor C1, C2, C4, a resistor R1, R2, R4, an operational amplifier U1A, one end of the capacitor C1 is connected to the full-frequency gain circuit, the other end of the capacitor C1 is connected to one end of the resistor R1, one end of the capacitor C2 is connected to the pick-up circuit, the other end of the capacitor C2 is connected to one end of the resistor R2, an inverting input end of the operational amplifier U1A is connected to the other end of the resistor R1, the other end of the resistor R2, one end of the capacitor C4, and one end of the resistor R4, the other end of the capacitor C4 is connected to an output end of the operational amplifier U1A, and is connected to the high-pass filter circuit, and a non-inverting input end of the operational amplifier U1A is connected to a reference voltage.
Preferably, the high-pass filter circuit includes a capacitor C3, a capacitor C6, a capacitor C7, a resistor R6, a resistor R7, and an operational amplifier U1B, the capacitor C6 is equal to the capacitor of the capacitor C7, the resistor R6 is equal to the resistor of the resistor R7, one end of the capacitor C6 is connected to the audio mixing circuit, the other end is connected to one end of the capacitor C7 and one end of the resistor R7, the other end of the capacitor C7 is connected to one end of the resistor R6 and the non-inverting input end of the operational amplifier U1B, the other end of the resistor R6 is connected to a reference voltage, the other end of the resistor R7 and the inverting input end and the output end of the operational amplifier U1B are both connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the intermediate frequency gain circuit.
Preferably, the intermediate frequency gain circuit includes resistors R3 and R5, a capacitor C5, and an operational amplifier U2A, one end of the resistor R3 is connected to the high-pass filter circuit, the other end of the resistor R3 is connected to one end of the capacitor C5, one end of the resistor R5, and an inverting input end of the operational amplifier U2A, a non-inverting input end of the operational amplifier U2A is connected to a reference voltage, and the other end of the capacitor C5, the other end of the resistor R5, and an output end of the operational amplifier U2A are connected to the mono mid-stage power amplifier.
The 2.1-channel handheld sound-amplifying microphone has the following beneficial effects: when the voice signal processing device is held by hands, the left channel full-frequency loudspeaker and the right channel full-frequency loudspeaker respectively produce sound to the left side and the right side, the middle-high frequency loudspeaker produces sound to the front side, the high-pass filter circuit, the middle-frequency gain circuit and the sound mixing circuit are added to process the voice signal picked up by the pickup device and input the processed voice signal into the special mono-channel middle-arranged power amplifier to amplify and drive the middle-high frequency loudspeaker, so that a listener in front of a sounder can obtain a sound amplifying effect which is clear enough and has a certain sound pressure, the coverage of the sound amplifying range is met in an omnibearing manner, the comprehensive sound amplifying of a useful sound field is formed, and the experience is better.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a 2.1 channel hand-held speech microphone in accordance with an embodiment of the invention;
FIG. 2 is a schematic circuit diagram of a 2.1 channel hand-held speech microphone in accordance with an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of the sound outlet body of a 2.1 channel hand-held speech microphone in an embodiment of the invention;
fig. 4 is a schematic circuit diagram of the mixing circuit, high pass filter circuit, and intermediate frequency gain circuit of fig. 2.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, the 2.1-channel handheld microphone according to a preferred embodiment of the present invention includes a handle 3, an audio output body 1, and a sound pickup 2, wherein the handle 3 is held by a human hand, the audio output body 1 is disposed at an upper end of the handle 3, and the sound pickup 2 is disposed at an upper end of the audio output body 1.
As shown in fig. 2 and 3, the sound emitting body 1 includes a housing 11, a left channel full-frequency speaker 12, a right channel full-frequency speaker 13, a mid-high frequency speaker 14, and a control circuit 15, and the sound pickup 2 is used to collect the field environmental sound and transmit the field environmental sound to the back-end control circuit 15.
The housing 11 is provided with a first mounting hole 111, a second mounting hole 112 and a third mounting hole 113 in sequence along the circumferential direction, and the first mounting hole 111 and the third mounting hole 113 are positioned on two opposite sides of the housing 11. The left channel full-frequency speaker 12 and the right channel full-frequency speaker 13 are respectively installed in the first installation hole 111 and the third installation hole 113 to sound outwards from two opposite sides of the shell 11, and the middle-high frequency speaker 14 is installed in the second installation hole 112, so that the left channel full-frequency speaker 12, the right channel full-frequency speaker 13 and the middle-high frequency speaker 14 can sound on three sides of a product.
The control circuit 15 includes a sound pickup circuit 151, a full-frequency gain circuit 152, a two-channel full-frequency power amplifier 153, a mixing circuit 154, a high-pass filter circuit 157, an intermediate-frequency gain circuit 155, and a mono mid-channel power amplifier 156. The pickup circuit 151 is electrically connected with the pickup 2, the full-frequency gain circuit 152 and the mixing circuit 154 are respectively electrically connected with the pickup circuit 151, and the sound wave signals acquired by the pickup 2 are processed and converted into audio signals by the pickup circuit 151 and are transmitted to the full-frequency gain circuit 152 to amplify and convert the audio signals.
The dual-channel full-frequency power amplifier 153 is electrically connected with the full-frequency gain circuit 152, the left-channel full-frequency speaker 12 and the right-channel full-frequency speaker 13 are respectively electrically connected with the dual-channel full-frequency power amplifier 153, and the dual-channel full-frequency power amplifier 153 receives the audio signals processed by the full-frequency gain circuit 152 and drives the left-channel full-frequency speaker 12 and the right-channel full-frequency speaker 13 to sound.
The audio mixing circuit 154 is also electrically connected to the full-band gain circuit 152, the high-pass filter circuit 157 is connected to the audio mixing circuit 154, and the intermediate-frequency gain circuit 155 is connected to the high-pass filter circuit 157. The audio signal processed by the full-frequency gain circuit 152 is mixed with the signal processed by the sound pickup circuit 151, and is transmitted to the high-pass filter circuit 157. The high pass filter circuit 157 allows frequencies above a certain cut-off frequency to pass while substantially attenuating lower frequencies, which removes unnecessary low frequency components or low frequency interference from the signal, and passes to the intermediate frequency gain circuit 155 for amplification and conversion of the audio signal.
The mono mid-set power amplifier 156 is electrically connected with the intermediate frequency gain circuit 155, and the mid-high frequency speaker 14 is electrically connected with the mono mid-set power amplifier 156, and the mono mid-set power amplifier 156 receives the audio signal processed by the full-frequency gain circuit 152 and drives the mid-high frequency speaker 14 to sound.
When the voice signal processing device is held by hands, the left channel full-frequency loudspeaker 12 and the right channel full-frequency loudspeaker 13 respectively produce sound to the left side and the right side, the middle-high frequency loudspeaker 14 produces sound to the front side, the high-pass filter circuit 157, the middle-frequency gain circuit 155 and the sound mixing circuit 154 are added to process the voice signal picked up by the sound pick-up 2 and input the processed signal into the special mono middle-frequency power amplifier 156 to amplify and drive the middle-high frequency loudspeaker 14, so that a listener in front of a sounder can obtain a sound amplifying effect which is clear enough and has certain sound pressure, the coverage of the sound amplifying range is satisfied in an omnibearing manner, the comprehensive sound amplifying of a useful sound field is formed, and the experience is better.
Preferably, the control circuit 15 further includes a bluetooth reception decoding and DSP Processing controller 158 (DSP: DIGITAL SIGNAL Processing, digital signal Processing) connected between the sound pickup circuit 151 and the full-frequency gain circuit 152 to decode the received audio signal and transmit it to the full-frequency gain circuit 152.
Referring to fig. 2 and 4, the audio mixing circuit 154 includes capacitors C1, C2, and C4, resistors R1, R2, and R4, an operational amplifier U1A, one end of the capacitor C1 is connected to the full-frequency gain circuit 152, the other end of the capacitor C1 is connected to one end of the resistor R1, one end of the capacitor C2 is connected to the pickup circuit 151, the other end of the capacitor C2 is connected to one end of the resistor R2, the inverting input end of the operational amplifier U1A is connected to the other end of the resistor R1, the other end of the resistor R2, one end of the capacitor C4, and one end of the resistor R4, the other end of the capacitor C4, the other end of the resistor R4, and the output end of the operational amplifier U1A are connected to the high-pass filter circuit 157, and the non-inverting input end of the operational amplifier U1A is connected to a reference voltage. The mixing circuit 154 can adjust the amplification factor of the mixing by adjusting the resistance values of R1 and R2.
The high-pass filter circuit 157 includes capacitors C3, C6, and C7, resistors R6 and R7, an operational amplifier U1B, the capacitor C6 and the capacitor C7 are equal, the resistor R6 and the resistor R7 are equal, one end of the capacitor C6 is connected to the audio mixing circuit, the other end is connected to one end of the capacitor C7 and one end of the resistor R7, the other end of the capacitor C7 is connected to one end of the resistor R6 and the non-inverting input terminal of the operational amplifier U1B, the other end of the resistor R6 and the inverting input terminal and the output terminal of the operational amplifier U1B are connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the intermediate frequency gain circuit 155. The high-pass filter circuit 157 adjusts the filter cutoff frequency by adjusting the resistance values of the resistors R6, R7 and the capacitance values of the capacitors C6, C7.
The intermediate frequency gain circuit 155 includes resistors R3 and R5, a capacitor C5, an operational amplifier U2A, one end of the resistor R3 is connected to the high pass filter circuit 157, the other end of the resistor R3 is connected to one end of the capacitor C5, one end of the resistor R5, and an inverting input end of the operational amplifier U2A, a non-inverting input end of the operational amplifier U2A is connected to a reference voltage, and the other end of the capacitor C5, the other end of the resistor R5, and an output end of the operational amplifier U2A are connected to the mono mid-channel power amplifier 156. The intermediate frequency gain circuit 155 adjusts the signal amplification by adjusting the resistance value of R3.
Preferably, in order to facilitate the installation of the left channel full-band speaker 12, the right channel full-band speaker 13, and the mid-band speaker 14, the sound output body 1 further includes three mounting seats 16 for respectively mounting the left channel full-band speaker 12, the right channel full-band speaker 13, and the mid-band speaker 14, and sound output holes 161 are formed in the middle of each mounting seat 16 for outputting sound from the left channel full-band speaker 12, the right channel full-band speaker 13, and the mid-band speaker 14.
The mount pad 16 detachably installs in the outside of shell 11, left channel full-range speaker 12, right channel full-range speaker 13, well tweeter 14 stretches into shell 11 by first mounting hole 111, second mounting hole 112, third mounting hole 113 respectively, let left channel full-range speaker 12, right channel full-range speaker 13, well tweeter 14 can install on shell 11 from shell 11 outside, simple to operate, and left channel full-range speaker 12, right channel full-range speaker 13, well tweeter 14's play sound side has mount pad 16 to shelter from, do benefit to the promotion outward appearance aesthetic measure.
Further, the sounding main body 1 is further provided with an operation panel 17 for controlling playing, and the operation panel 17 is provided with physical keys or touch keys, so that the operation panel 17 can control the working state and sounding of the microphone. In the present embodiment, the operation panel 17 is located on the opposite side of the housing 11 from the second mounting hole 112, and the operation panel 17 is opposite to the user in use. Preferably, the operation panel 17 is detachably mounted on the housing 11, so that the whole assembly and disassembly are facilitated.
The power supply is arranged in the handheld handle 3 to supply power to the left channel full-frequency loudspeaker 12, the right channel full-frequency loudspeaker 13, the middle-high frequency loudspeaker 14 and the control circuit 15, and the power supply is a rechargeable battery for recycling.
Preferably, the power source is cylindrical and a battery compartment for mounting the power source is formed in the hand-held grip 3.
It will be appreciated that the above technical features may be used in any combination without limitation.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (8)
1. A 2.1 sound channel handheld sound amplifying microphone is characterized by comprising a handheld handle (3), a sound emitting main body (1) and a pickup (2);
the sound emitting main body (1) comprises a shell (11), a left channel full-frequency loudspeaker (12), a right channel full-frequency loudspeaker (13), a middle-high frequency loudspeaker (14) and a control circuit (15);
a first mounting hole (111), a second mounting hole (112) and a third mounting hole (113) are sequentially formed in the shell (11) along the circumferential direction, and the first mounting hole (111) and the third mounting hole (113) are positioned on two opposite sides of the shell (11); the left channel full-frequency loudspeaker (12) and the right channel full-frequency loudspeaker (13) are respectively arranged in the first mounting hole (111) and the third mounting hole (113) so as to sound outwards from two opposite sides of the shell (11), and the middle-high frequency loudspeaker (14) is arranged in the second mounting hole (112);
The control circuit (15) comprises a pickup circuit (151), a full-frequency gain circuit (152), a double-channel full-frequency power amplifier (153), a sound mixing circuit (154), a high-pass filter circuit (157), an intermediate-frequency gain circuit (155) and a mono-channel middle-set power amplifier (156);
The sound pickup circuit (151) is electrically connected with the sound pickup (2), and the full-frequency gain circuit (152) and the sound mixing circuit (154) are respectively electrically connected with the sound pickup circuit (151);
The dual-channel full-frequency power amplifier (153) is electrically connected with the full-frequency gain circuit (152), the left channel full-frequency loudspeaker (12) and the right channel full-frequency loudspeaker (13) are respectively electrically connected with the dual-channel full-frequency power amplifier (153), and the dual-channel full-frequency power amplifier (153) receives the audio signals processed by the full-frequency gain circuit (152) and drives the left channel full-frequency loudspeaker (12) and the right channel full-frequency loudspeaker (13) to sound;
The audio mixing circuit (154) is further electrically connected with the full-frequency gain circuit (152), the high-pass filter circuit (157) is connected with the audio mixing circuit (154), the intermediate frequency gain circuit (155) is connected with the high-pass filter circuit (157), the mono mid-set power amplifier (156) is electrically connected with the intermediate frequency gain circuit (155), the mid-high frequency loudspeaker (14) is electrically connected with the mono mid-set power amplifier (156), and the mono mid-set power amplifier (156) receives the audio signal processed by the full-frequency gain circuit (152) and drives the mid-high frequency loudspeaker (14) to sound;
The sound emitting main body (1) further comprises three mounting seats (16) for mounting the left channel full-frequency loudspeaker (12), the right channel full-frequency loudspeaker (13) and the middle-high frequency loudspeaker (14) respectively, and sound emitting holes (161) are formed in the middle of each mounting seat (16) for emitting sound of the left channel full-frequency loudspeaker (12), the right channel full-frequency loudspeaker (13) and the middle-high frequency loudspeaker (14);
the mounting seat (16) is detachably arranged on the outer side of the shell (11), and the left channel full-frequency loudspeaker (12), the right channel full-frequency loudspeaker (13) and the middle-high frequency loudspeaker (14) extend into the shell (11) from the first mounting hole (111), the second mounting hole (112) and the third mounting hole (113) respectively;
An operation panel (17) for controlling playing is further arranged on the sounding main body (1).
2. The 2.1 channel hand-held microphone of claim 1, wherein the control circuit (15) further comprises a bluetooth receive decode and DSP process controller (158) connected between the pick-up circuit (151) and the full frequency gain circuit (152) to decode the received audio signal for transmission to the full frequency gain circuit (152).
3. 2.1-Channel hand-held microphone according to claim 1, characterized in that the operation panel (17) is located on the side of the housing (11) opposite to the second mounting hole (112), and that the operation panel (17) is detachably mounted on the housing (11).
4. A 2.1 channel hand-held loudspeaker microphone according to claim 1 or 2, characterized in that a power supply is provided in the hand-held grip (3) for supplying power to the left channel full-range loudspeaker (12), the right channel full-range loudspeaker (13), the mid-range tweeter (14) and the control circuit (15).
5. The 2.1 channel hand-held microphone according to claim 4, characterized in that the power supply is cylindrical, and a battery compartment for mounting the power supply is formed in the hand-held handle (3).
6. The 2.1-channel hand-held microphone according to claim 1, wherein the mixing circuit (154) comprises capacitors C1, C2, C4, resistors R1, R2, R4, an operational amplifier U1A, one end of the capacitor C1 is connected to the full-frequency gain circuit (152), the other end of the capacitor C1 is connected to one end of the resistor R1, one end of the capacitor C2 is connected to the sound pickup circuit (151), the other end of the capacitor C2 is connected to one end of the resistor R2, an inverting input end of the operational amplifier U1A is connected to the other end of the resistor R1, the other end of the resistor R2, and one end of the capacitor C4, the other end of the resistor R4 is connected to an output end of the operational amplifier U1A, and is connected to the high-pass filter circuit (157), and a non-inverting input end of the operational amplifier U1A is connected to a reference voltage.
7. The 2.1-channel handheld microphone according to claim 1, wherein the high-pass filter circuit (157) comprises capacitors C3, C6, C7, resistors R6, R7, and an operational amplifier U1B, the capacitor C6 is equal to the capacitor C7, the resistor R6 is equal to the resistor R7, one end of the capacitor C6 is connected to the audio mixing circuit, the other end is connected to one end of the capacitor C7 and one end of the resistor R7, the other end of the capacitor C7 is connected to one end of the resistor R6 and the non-inverting input terminal of the operational amplifier U1B, the other end of the resistor R6 is connected to a reference voltage, the other end of the resistor R7 and the inverting input terminal and the output terminal of the operational amplifier U1B are connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the intermediate frequency gain circuit (155).
8. The 2.1 channel hand-held microphone according to claim 1, characterized in that the intermediate frequency gain circuit (155) comprises resistors R3, R5, a capacitor C5, an operational amplifier U2A, one end of the resistor R3 being connected to the high pass filter circuit (157), the other end of the resistor R3 being connected to one end of the capacitor C5, one end of the resistor R5, and an inverting input of the operational amplifier U2A, the non-inverting input of the operational amplifier U2A being connected to a reference voltage, the other end of the capacitor C5, the other end of the resistor R5, and an output of the operational amplifier U2A being connected to the mono mid-set power amplifier (156).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910664257.XA CN110234052B (en) | 2019-07-23 | 2019-07-23 | 2.1 Sound track hand-held sound-amplifying microphone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910664257.XA CN110234052B (en) | 2019-07-23 | 2019-07-23 | 2.1 Sound track hand-held sound-amplifying microphone |
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| CN110234052A CN110234052A (en) | 2019-09-13 |
| CN110234052B true CN110234052B (en) | 2024-05-17 |
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