CN209845283U - 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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- CN209845283U CN209845283U CN201921165570.0U CN201921165570U CN209845283U CN 209845283 U CN209845283 U CN 209845283U CN 201921165570 U CN201921165570 U CN 201921165570U CN 209845283 U CN209845283 U CN 209845283U
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Abstract
The utility model relates to a handheld microphone that amplifies sound of 2.1 sound channels, including handheld handle, sound production main part and adapter. The sound outlet main body comprises a shell, a left sound channel full-frequency loudspeaker, a right sound channel full-frequency loudspeaker, a middle-high frequency loudspeaker and a control circuit; a first mounting hole, a second mounting hole and a third mounting hole are sequentially arranged on 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 full loudspeaker of the left channel, the full loudspeaker of the right channel are installed in first mounting hole, third mounting hole respectively, and medium-high frequency speaker is installed in the second mounting hole. When the human hand is held for use, the left side and the right side and the front side are all sounded, the control circuit is additionally provided with the high-pass filter circuit, the medium-frequency gain circuit and the sound mixing circuit, and voice signals picked up by the sound pickup are subjected to signal processing and input into a single-track middle power amplifier to amplify power for driving a medium-high frequency loudspeaker, so that a listener in front of a sounder can obtain a sound amplification effect which is clear enough and has certain sound pressure.
Description
Technical Field
The present invention relates to a handheld microphone, and more particularly, to a 2.1 channel handheld microphone.
Background
At present, the known handheld microphone is composed of a moving-coil sound pickup, a battery, a power amplifier board, a handheld casing and two full-frequency speakers, and realizes sound amplification. The voice enters the power amplification board through the sound pick-up to be amplified in power and then drives the loudspeaker to amplify the voice.
However, due to the structural limitation, the two full-frequency speakers are usually placed at the left and right sides of the housing, so that the sound-amplifying range is very weak right in front of the speaker, and it is difficult to achieve a perfect sound-amplifying effect.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a handheld megaphone of 2.1 sound channels.
The utility model provides a technical scheme that its technical problem adopted is: a2.1-channel handheld sound amplifying microphone is constructed and comprises a handheld handle, a sound emitting body and a sound pick-up;
the sound outlet main body comprises a shell, a left sound channel full-frequency loudspeaker, a right sound channel full-frequency loudspeaker, a middle-high frequency loudspeaker and a control circuit;
a first mounting hole, a second mounting hole and a third mounting hole are sequentially arranged on 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 installed in the first installation hole and the third installation hole so as to produce sound outwards from two opposite sides of the shell, and the middle-high frequency loudspeaker is installed in the second installation hole;
the control circuit comprises a pickup circuit, a full-frequency gain circuit, a dual-channel full-frequency power amplifier, a sound mixing circuit, a high-pass filter circuit, a medium-frequency gain circuit and a single-track middle power amplifier;
the pickup circuit is electrically connected with the pickup, and the full-frequency gain circuit and the sound mixing circuit are respectively electrically connected with the pickup circuit;
the dual-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 electrically connected with the dual-channel full-frequency power amplifier, and the dual-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 sound mixing circuit is also electrically connected with the full-frequency gain circuit, the high-pass filter circuit is connected with the sound mixing circuit, the medium-frequency gain circuit is connected with the high-pass filter circuit, the single-channel middle power amplifier is electrically connected with the medium-frequency gain circuit, the medium-high frequency loudspeaker is electrically connected with the single-channel middle power amplifier, and the single-channel middle power amplifier receives the audio signal processed by the full-frequency gain circuit and drives the medium-high frequency loudspeaker to sound.
Preferably, the control circuit further comprises a bluetooth receiving, decoding and DSP processing controller connected between the sound pickup circuit and the full-band gain circuit, so as to decode and process the received audio signal and transmit the decoded audio signal to the full-band gain circuit.
Preferably, the sound outlet 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 a sound outlet hole is formed in the middle of each mounting seat for enabling the left channel full-frequency speaker, the right channel full-frequency speaker and the middle-high frequency speaker to emit sound;
mount pad detachably installs the outside of shell, the full speaker of the full frequency of left channel, the full speaker of the full frequency of right channel, well high frequency speaker respectively by first mounting hole, second mounting hole, third mounting hole reach in the shell.
Preferably, an operation panel for controlling playing is further disposed on the sound emitting main body.
Preferably, the operation panel is located on 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 handheld handle to supply power to the left channel full-frequency loudspeaker, the right channel full-frequency loudspeaker, the middle-high frequency loudspeaker and the control circuit.
Preferably, the power supply is cylindrical, and a battery compartment for mounting the power supply is formed in the handle.
Preferably, the mixer circuit includes capacitors C1, C2, C4, resistors R1, R2, R4, and an operational amplifier U1A, one end of the capacitor C1 is connected to the full-band 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 sound pickup circuit, the other end of the capacitor C2 is connected to one end of the resistor R2, a second pin 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 and the other end of the resistor R4 are connected to the first pin of the operational amplifier U1A and to the high-pass filter circuit, and a third pin of the operational amplifier U1A is connected to a reference voltage.
Preferably, the high-pass filter circuit includes capacitors C3, C6, C7, resistors R6, R7, 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 of the capacitor C7 is connected to one end of the resistor R7, the other end of the capacitor C7 is connected to one end of the resistor R6 and a fifth pin 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, a sixth pin and a seventh pin 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 a second pin of the operational amplifier U2A, a third pin 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 a first pin of the operational amplifier U2A are connected to the mono centrally located power amplifier.
Implement the utility model discloses a 2.1 sound channel handheld microphone has following beneficial effect: when the staff grips the use, the full loudspeaker of left channel, the full loudspeaker of right channel is to the left and right sides sound production respectively, well high-frequency speaker is to the sound production of front side, increase high pass filter circuit, the speech signal that medium frequency gain circuit and mixing circuit picked up the adapter carries out signal processing and inputs and carry out power amplification drive well high-frequency speaker in the special single track is put the power amplifier in, make the audience in the dead ahead of sound producer can obtain enough clear and the public address effect that possesses certain acoustic pressure, the omnidirectional satisfies the cover of public address scope, it makes the sound fully public address to form useful sound field, experience and feel better.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of a 2.1 channel handheld microphone according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a 2.1 channel handheld microphone according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a sound emitting main body of a 2.1 channel handheld microphone according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of the mixing circuit, the high-pass filter circuit, and the intermediate-frequency gain circuit in fig. 2.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the 2.1 sound track hand-held microphone in a preferred embodiment of the present invention includes a hand-held handle 3, a sound-emitting body 1, and a sound pickup 2, wherein the hand-held handle 3 is held by a human hand, the sound-emitting body 1 is disposed on the upper end of the hand-held handle 3, and the sound pickup 2 is disposed on the upper end of the sound-emitting body 1.
As shown in fig. 2 and 3, the sound emitting body 1 includes a housing 11, a left channel full range speaker 12, a right channel full range speaker 13, a middle and high frequency speaker 14, and a control circuit 15, and the sound pickup 2 is used for collecting the live environment sound and transmitting the live environment sound to the rear end control circuit 15.
The housing 11 is sequentially provided with a first mounting hole 111, a second mounting hole 112, and a third mounting hole 113 along a circumferential direction, and the first mounting hole 111 and the third mounting hole 113 are located on two opposite sides of the housing 11. Full speaker 12 of left channel, the full speaker 13 of right channel are installed respectively in first mounting hole 111, third mounting hole 113 to outwards produce the sound from the double-phase contralateral side of shell 11, and well high frequency speaker 14 is installed in second mounting hole 112, lets full speaker 12 of left channel, the full speaker 13 of right channel, well high frequency speaker 14 can go out the sound at the trilateral of product.
The control circuit 15 includes a sound pickup circuit 151, a full-band gain circuit 152, a dual-channel full-band power amplifier 153, a sound mixing circuit 154, a high-pass filter circuit 157, an intermediate-frequency gain circuit 155, and a mono channel center power amplifier 156. Pickup circuit 151 and pickup 2 electric connection, full frequency gain circuit 152, sound mixing circuit 154 respectively with pickup circuit 151 electric connection, the sound wave signal that pickup 2 obtained is through pickup circuit 151 processing conversion audio signal, gives full frequency gain circuit 152 for, and to audio signal amplification and conversion.
Binary channels full frequency power amplifier 153 and full frequency gain circuit 152 electric connection of full frequency, left channel full frequency speaker 12, right channel full frequency speaker 13 respectively with binary channels full frequency power amplifier 153 electric connection, binary channels full frequency power amplifier 153 receives the audio signal that full frequency gain circuit 152 was handled and drives left channel full frequency speaker 12, right channel full frequency speaker 13 and sound.
The mixing circuit 154 is further electrically connected to the full-band gain circuit 152, the high-pass filter circuit 157 is connected to the 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-band gain circuit 152 is mixed with the signal processed by the sound pickup circuit 151, and is transferred to the high-pass filter circuit 157. The high pass filter circuit 157 allows frequencies above a certain cutoff frequency to pass while substantially attenuating lower frequencies, which removes unwanted low frequency components or low frequency interference from the signal, which is then passed to the if gain circuit 155 for amplification and conversion of the audio signal.
The mono channel mid-set power amplifier 156 is electrically connected to the mid-frequency gain circuit 155, the medium-high frequency speaker 14 is electrically connected to the mono channel mid-set power amplifier 156, and the mono channel mid-set power amplifier 156 receives the audio signal processed by the full-frequency gain circuit 152 and drives the medium-high frequency speaker 14 to sound.
When the human hand holds the use, the left channel full-frequency loudspeaker 12, the right channel full-frequency loudspeaker 13 respectively produce sound to the left and right sides, the middle-high frequency loudspeaker 14 produces sound to the front side, the high pass filter circuit 157, the medium frequency gain circuit 155 and the sound mixing circuit 154 are added, the voice signal picked up by the sound pickup 2 is processed and input to the special single channel middle power amplifier 156 for power amplification driving the middle-high frequency loudspeaker 14, so that the listener in front of the sound producer can obtain the sound amplification effect which is clear enough and has certain sound pressure, the omnibearing coverage which meets the sound amplification range is realized, the comprehensive sound amplification of a useful sound field is formed, and the experience feeling is better.
Preferably, the control circuit 15 further includes a bluetooth receiver decoder and DSP processor controller 158 (DSP) connected between the sound pickup circuit 151 and the full-band gain circuit 152 to decode the received audio Signal and transmit the decoded audio Signal to the full-band gain circuit 152.
As shown in fig. 2 and 4, the mixer circuit 154 includes capacitors C1, C2, C4, resistors R1, R2, R4, an operational amplifier U1A, one end of the capacitor C1 is connected to the full-band 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, a second pin 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 and the other end of the resistor R4 are connected to a first pin of the operational amplifier U1A and to the high-pass filter circuit 157, and a third pin of the operational amplifier U1A is connected to. The mixing circuit 154 can adjust the amplification factor of the mixed sound by adjusting the resistance values of R1 and R2.
The high-pass filter circuit 157 comprises capacitors C3, C6 and C7, resistors R6 and R7, an operational amplifier U1B, a capacitor C6 equal to the capacitor C7, a resistor R6 equal to the resistor R7, one end of the capacitor C6 connected to the audio mixing circuit, the other end of the capacitor C7 connected to one end of the capacitor C7 and one end of the resistor R7, the other end of the capacitor C7 connected to one end of the resistor R6 and a fifth pin of the operational amplifier U1B, the other end of the resistor R6 connected to a reference voltage, the other end of the resistor R7, a sixth pin and a seventh pin of the operational amplifier U1B connected to one end of the capacitor C3, and the other end of the capacitor C3 connected to the intermediate-frequency gain circuit 155. The high-pass filter circuit 157 adjusts the filtering cut-off frequency by adjusting the resistance values of the resistors R6 and R7 and the capacitance values of the capacitors C6 and C7.
The intermediate-frequency gain circuit 155 comprises resistors R3 and R5, a capacitor C5 and an operational amplifier U2A, wherein one end of the resistor R3 is connected with the high-pass filter circuit 157, the other end of the resistor R3 is connected with one end of the capacitor C5, one end of the resistor R5 and a second pin of the operational amplifier U2A, a third pin of the operational amplifier U2A is connected with a reference voltage, and the other end of the capacitor C5, the other end of the resistor R5 and a first pin of the operational amplifier U2A are connected with the monaural central power amplifier 156. The if gain circuit 155 adjusts the signal amplification factor by adjusting the resistance of R3.
Preferably, in order to facilitate the installation of the left channel full-range speaker 12, the right channel full-range speaker 13, and the middle-high frequency speaker 14, the sound emission main body 1 further includes three installation seats 16 for the left channel full-range speaker 12, the right channel full-range speaker 13, and the middle-high frequency speaker 14 to be installed, and a sound emission hole 161 is formed in the middle of each installation seat 16 for the left channel full-range speaker 12, the right channel full-range speaker 13, and the middle-high frequency speaker 14 to emit sound.
The outside at shell 11 is installed to 16 detachably of mount pad, the full loudspeaker 12 of the left channel, the full loudspeaker 13 of the right channel, well high frequency speaker 14 is respectively by first mounting hole 111, second mounting hole 112, the third mounting hole 113 stretches into in the shell 11, let the full loudspeaker 12 of the left channel, the full loudspeaker 13 of the right channel, well high frequency speaker 14 can be installed on shell 11 from the shell 11 outside, high durability and convenient installation, and the full loudspeaker 12 of the left channel, the full loudspeaker 13 of the right channel, the play sound side of well high frequency speaker 14 has mount pad 16 to shelter from, do benefit to and promote the pleasing to the eye degree of outward appearance.
Furthermore, an operation panel 17 for controlling playing is further disposed on the sound emitting main body 1, and a physical key or a touch key is disposed on the operation panel 17, so that the operation panel 17 can control the working state and sound emission of the microphone. In the 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 when in use. Preferably, the operation panel 17 is detachably mounted on the housing 11, which facilitates the overall assembly and disassembly.
The power supply is arranged in the hand-held handle 3 and supplies 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 and can be recycled.
Preferably, the power source is cylindrical, and a battery compartment for mounting the power source is formed in the handle 3.
It is to be understood that the above-described respective technical features may be used in any combination without limitation.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A2.1 sound channel hand-held microphone is characterized by comprising a hand-held handle (3), a sound-emitting main body (1) and a sound pick-up (2);
the sound emitting main body (1) comprises a shell (11), a left channel full-range loudspeaker (12), a right channel full-range 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 located on two opposite sides of the shell (11); the left channel full-range loudspeaker (12) and the right channel full-range loudspeaker (13) are respectively installed in the first installation hole (111) and the third installation hole (113) so as to produce sound outwards from two opposite sides of the shell (11), and the middle-high frequency loudspeaker (14) is installed in the second installation hole (112);
the control circuit (15) comprises a pickup circuit (151), a full-frequency gain circuit (152), a dual-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 single-channel middle power amplifier (156);
the pickup circuit (151) is electrically connected with the pickup (2), and the full-frequency gain circuit (152) and the sound mixing circuit (154) are respectively electrically connected with the pickup circuit (151);
the dual-channel full-frequency 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 amplifier (153), and the dual-channel full-frequency amplifier (153) receives an audio signal 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 monaural power amplifier (156) is electrically connected with the intermediate-frequency gain circuit (155), the medium-high frequency loudspeaker (14) is electrically connected with the monaural power amplifier (156), and the monaural power amplifier (156) is arranged in the middle to receive the audio signal processed by the full-frequency gain circuit (152) and drive the medium-high frequency loudspeaker (14) to sound.
2. The 2.1 channel handheld microphone according to claim 1, wherein the control circuit (15) further comprises a bluetooth receiver decoder and DSP processor controller (158) connected between the pickup circuit (151) and the full-band gain circuit (152) for decoding and processing the received audio signal and transmitting the decoded audio signal to the full-band gain circuit (152).
3. The 2.1-channel handheld microphone according to claim 1 or 2, wherein the sound emitting body (1) further includes three mounting seats (16) for mounting the left-channel full-range speaker (12), the right-channel full-range speaker (13) and the middle-high frequency speaker (14), respectively, and a sound emitting hole (161) is formed in the middle of each mounting seat (16) for emitting sound from the left-channel full-range speaker (12), the right-channel full-range speaker (13) and the middle-high frequency speaker (14);
mount pad (16) detachably install the outside of shell (11), the full loudspeaker (12) of the full channel of left side, the full loudspeaker (13) of the full channel of right side, well high frequency loudspeaker (14) are respectively by first mounting hole (111), second mounting hole (112), third mounting hole (113) are stretched in shell (11).
4. The 2.1-channel handheld microphone according to claim 1 or 2, wherein the sound-emitting main body (1) is further provided with an operation panel (17) for controlling playing.
5. The 2.1 channel hand microphone according to claim 4, characterized in that the operation panel (17) is located on the side of the housing (11) opposite to the second mounting hole (112), and the operation panel (17) is detachably mounted on the housing (11).
6. The 2.1-channel handheld microphone according to claim 1 or 2, wherein a power supply is provided in the handheld handle (3) to supply power to the left-channel full-range speaker (12), the right-channel full-range speaker (13), the middle-high frequency speaker (14), and the control circuit (15).
7. The 2.1 channel handheld acoustic microphone according to claim 6, wherein the power supply is cylindrical, and a battery compartment for mounting the power supply is formed in the handle (3).
8. The 2.1 channel handheld public address microphone of claim 1, the sound mixing circuit (154) comprises 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-band 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 with the sound pickup circuit (151), the other end of the capacitor C2 is connected with one end of the resistor R2, the second pin of the operational amplifier U1A is connected with 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 and the other end of the resistor R4 are connected with a first pin of the operational amplifier U1A, and is connected with the high-pass filter circuit (157), and the third pin of the operational amplifier U1A is connected with a reference voltage.
9. The 2.1-channel handheld megaphone as claimed in claim 1, wherein the high pass filter circuit (157) includes capacitors C3, C6, C7, resistors R6, R7, 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 sound 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 a fifth pin of an operational amplifier U1B, the other end of the resistor R6 is connected to a reference voltage, the other end of the resistor R7 and a sixth pin and a seventh pin 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).
10. The 2.1-channel handheld megaphone as claimed in claim 1, wherein the intermediate frequency gain circuit (155) comprises resistors R3, 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 a second pin of the operational amplifier U2A, a third pin 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 a first pin of the operational amplifier U2A are connected to the mono centrally located power amplifier (156).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921165570.0U CN209845283U (en) | 2019-07-23 | 2019-07-23 | 2.1 sound track hand-held sound amplifying microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921165570.0U CN209845283U (en) | 2019-07-23 | 2019-07-23 | 2.1 sound track hand-held sound amplifying microphone |
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| CN209845283U true CN209845283U (en) | 2019-12-24 |
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| CN201921165570.0U Active CN209845283U (en) | 2019-07-23 | 2019-07-23 | 2.1 sound track hand-held sound amplifying microphone |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110234052A (en) * | 2019-07-23 | 2019-09-13 | 深圳市美妙之音科技有限公司 | 2.1 sound channels hold public address microphone |
| CN110234052B (en) * | 2019-07-23 | 2024-05-17 | 深圳市美妙之音科技有限公司 | 2.1 Sound track hand-held sound-amplifying microphone |
-
2019
- 2019-07-23 CN CN201921165570.0U patent/CN209845283U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110234052A (en) * | 2019-07-23 | 2019-09-13 | 深圳市美妙之音科技有限公司 | 2.1 sound channels hold public address microphone |
| CN110234052B (en) * | 2019-07-23 | 2024-05-17 | 深圳市美妙之音科技有限公司 | 2.1 Sound track hand-held sound-amplifying microphone |
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