CN213126391U - Novel live microphone - Google Patents
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- CN213126391U CN213126391U CN202021816384.1U CN202021816384U CN213126391U CN 213126391 U CN213126391 U CN 213126391U CN 202021816384 U CN202021816384 U CN 202021816384U CN 213126391 U CN213126391 U CN 213126391U
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Abstract
The embodiment of the utility model discloses novel live microphone, be applied to electron technical field, this novel live microphone includes the adapter, enlarge the module, volume control module, first processing module, second processing module, monitor module and output module, after their sound signal processing who picks up the adapter, export respectively for monitoring module by first processing module, output module and second processing module, second processing module generates negative bias signal transmission and gives volume control module, volume control module is according to the size of negative bias value, dynamic adjustment self impedance, make the signal amplitude who sends for first processing module take place with the change in the opposite direction of volume control module self impedance change, realize the automatic control to the volume, improve the stability of live broadcast output sound signal, guarantee the effect.
Description
Technical Field
The utility model belongs to the technical field of the electron, especially, relate to a novel live microphone.
Background
Live broadcasting is a common broadcasting form at present, and a live microphone is required by a main broadcast in the live broadcasting process. The existing live broadcast microphone has the defects that the volume can not be automatically controlled, and the anchor needs to manually control the volume output in the application process, so that the stability of a live broadcast output sound signal is insufficient, and the live broadcast effect is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a novel live microphone aims at solving current stereo set volume when the broadcast and can not automatic control, and manual adjustment volume causes the unstable problem of live broadcast output signal.
An embodiment of the utility model provides a novel live microphone, include:
the sound pick-up device comprises a sound pick-up, an amplification module, a volume control module, a first processing module, a second processing module, a monitoring module and an output module; the amplification module is connected with the sound pickup and the volume control module, the first processing module is connected with the volume control module, the second processing module, the monitoring module and the output module, and the volume control module is also connected with the second processing module;
the sound pickup is used for picking up a sound signal, converting the sound signal into a first electric signal and then sending the first electric signal to the amplification module to be amplified into a second electric signal; the volume control module is configured to receive the second electrical signal, send the second electrical signal to the first processing module for amplification to obtain a third electrical signal, and output the third electrical signal to drive the monitoring module to monitor, output the third electrical signal to the output module, and output the third electrical signal to the second processing module; the second processing module is configured to process the received third electrical signal to generate a negative bias signal, and send the negative bias signal to the volume control module; the volume control module is configured to dynamically adjust a self impedance according to a magnitude of a negative bias value of the negative bias signal, so that a magnitude of the second electrical signal sent to the first processing module changes in a direction opposite to a change of the self impedance of the volume control module, where a change direction of the self impedance of the volume control module is the same as a change direction of the negative bias value.
Further, the novel live microphone further comprises a first capacitor and a second capacitor; the amplification module includes: a tertiary pipe; the base of triode is connected with one end of first electric capacity, the other end of first electric capacity is connected with the adapter, the projecting pole of triode is connected with the one end of second electric capacity.
Further, novel live microphone still includes the third electric capacity, volume control module includes: a field effect transistor; and the drain electrode of the field effect transistor is connected with the other end of the second capacitor, and the source electrode of the field effect transistor is connected with one end of the third capacitor.
Further, the second processing module comprises a negative feedback module and a shaping filtering module; one end of the negative feedback module is connected with the first processing module, the other end of the negative feedback module is connected with one end of the shaping filtering module, and the other end of the shaping filtering module is connected with the field effect tube.
Further, the negative feedback module comprises a fourth capacitor; the first processing module is specifically a signal processing chip, a first pin of the signal processing chip is connected with the other end of the third capacitor, and the monitoring module is connected in series between a second pin and a third pin of the signal processing chip; the second pin is further connected with the output module, and the third pin is further connected with one end of the fourth capacitor.
Furthermore, the shaping filtering module further comprises an adjustable resistor, a diode and a fifth capacitor; the other end of the fourth capacitor is connected with one end of the adjustable resistor, the other end of the adjustable resistor is connected with the cathode of the diode, the anode of the diode is connected with the grid of the field effect transistor and one end of the fifth capacitor, and the other end of the fifth capacitor is grounded.
Further, the resistance value of the adjustable resistor is a preset value, and the preset value is a current resistance value of the adjustable resistor corresponding to the situation that when the sound pickup acquires a pure tone signal with a preset frequency, the waveform of the pure tone signal displayed by the oscilloscope serving as the output module is undistorted.
Further, the monitoring module is a monitoring earphone.
It can be known from the above embodiments of the present invention that, the amplification module of the new type live microphone is connected to the sound pick-up and the volume control module, the first processing module is connected to the volume control module, the second processing module, the monitoring module and the output module, the volume control module is further connected to the second processing module, the sound signal is processed by the sound pick-up, the amplification module, the volume control module and the first processing module and is sent to the monitoring module, the output module and the second processing module, the second processing module generates a negative bias signal and negatively feeds back the signal to the volume control module, the volume control module dynamically adjusts its own impedance according to the change of the negative bias signal, so that the amplitude of the second electrical signal sent to the first processing module at this time changes in the opposite direction to the change of the own impedance of the volume control module, and the change direction of the own impedance of the volume control module is the same as the change direction of the negative, when the negative bias value of the bias signal is a smaller value, the impedance of the volume control module per se becomes smaller, then the amplitude of the second electrical signal becomes larger, thereby the influence on the negative bias value also becomes larger, then the impedance of the volume control module per se also becomes larger, the amplitude of the second electrical signal then becomes smaller along with the impedance, the negative bias value of the bias signal is reduced to a smaller value again, the cycle is repeated, the volume control module realizes the automatic adjustment of the amplitude of the second electrical signal output by the volume control module, thereby after the third electrical signal is output, namely, the volume of the signal output by the output module is automatically controlled, the stability of the live broadcast output sound signal is improved, and the live broadcast effect is ensured.
Drawings
In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
Fig. 1 is a schematic diagram of module connection of a novel live microphone provided by an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a novel live microphone provided by an embodiment of the present invention.
Detailed Description
To make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention are clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
The novel live broadcast microphone in the embodiment can generate a negative bias on the field effect tube, and the field effect tube dynamically adjusts the impedance of the field effect tube according to the difference of the values of the negative bias, so that the aim of adjusting the signal amplitude output to the monitoring earphone and the output end is fulfilled, the automatic control of the live broadcast volume is realized, namely when the volume is greater than a set value, the volume can automatically drop; on the contrary, when the volume is smaller than the set value, the volume can be automatically increased, so that the balanced output of the sound is ensured, the live broadcast effect is greatly improved, the signal amplitude of the monitoring earphone is consistent with that of the output end, and the monitoring is ensured to be the same as the real output volume. The details are described below in examples.
Referring to fig. 1, fig. 1 is a schematic diagram of a module connection structure of a novel live microphone provided by an embodiment of the present invention. This novel live microphone includes:
the sound collecting device comprises a sound collector 10, an amplifying module 20, a volume control module 30, a first processing module 40, a second processing module 50, a monitoring module 60 and an output module 70;
the sound pick-up 10 is connected with the amplifying module 20, the volume control module 30 is connected with the amplifying module 20, the first processing module 40 and the second processing module 50, and the first processing module 40 is further connected with the monitoring module 60 and the output module 70;
the sound pickup 10 may be specifically a microphone, and is configured to pick up a sound signal, convert the sound signal into a first electrical signal, and send the first electrical signal to the amplifying module 20, where the amplifying module 20 amplifies the first electrical signal into a second electrical signal;
the volume control module 30 is configured to receive the second electrical signal, send the second electrical signal to the first processing module 40 for amplification to obtain a third electrical signal, and output the third electrical signal in three paths, where one path of output is used to drive the monitoring module 60 to monitor, and the other path of output is sent to the output module 70, so that the output module 70 outputs the sound signal converted by the third electrical signal to the outside, and the other path of output is sent to the second processing module 50;
the second processing module 50 is configured to process the received third electrical signal to generate a negative bias signal, and send the negative bias signal to the volume control module 30;
the volume control module 30 is configured to dynamically adjust its own impedance according to a change of the negative bias value of the negative bias signal, so that a change of the amplitude of the second electrical signal sent to the first processing module 40 is opposite to a change of the own impedance of the volume control module 30, a change direction of the own impedance of the volume control module 30 is the same as a change direction of the negative bias value, specifically, when the negative bias value of the bias signal is 0, the own impedance of the volume control module 30 becomes smaller, the amplitude of the second electrical signal becomes larger, the negative bias value of the bias signal becomes larger, the own impedance of the volume control module 30 becomes larger, the amplitude of the second electrical signal becomes smaller accordingly, the negative bias value of the bias signal is 0 again, and in this way, the volume control module 30 realizes automatic adjustment of the amplitude of the second electrical signal output by the volume control module 30, so that after the third electrical signal is output, i.e., volume of the signal output from the output module 70. The volume is automatically controlled, the phenomenon that the sound is loud and unstable in the live broadcasting process is avoided, and the live broadcasting sound effect is improved.
In this embodiment, the amplification module of the novel live microphone is connected to the sound pick-up and the volume control module, the first processing module is connected to the volume control module, the second processing module, the monitoring module and the output module, the volume control module is further connected to the second processing module, the sound signal is processed by the sound pick-up, the amplification module, the volume control module and the first processing module and is sent to the monitoring module, the output module and the second processing module, the second processing module generates a negative bias signal to the volume control module, the volume control module dynamically adjusts its impedance according to the change of the negative bias signal, so that the amplitude of the second signal sent to the first processing module at this time changes in the opposite direction to the change of the impedance of the volume control module itself, and the change direction of the impedance of the volume control module itself is the same as the change direction of the negative bias signal, when the negative bias value of the bias signal is a small value, the impedance of the volume control module per se becomes small, the amplitude of the second electrical signal becomes large, so that the negative bias value also becomes large, the impedance of the volume control module per se also becomes large, the amplitude of the second electrical signal becomes small, the negative bias value of the bias signal is reduced to a small value again, the operation is circulated, the volume control module realizes automatic adjustment of the amplitude of the second electrical signal output by the volume control module, so that after the third electrical signal is output, namely, the volume of the signal output by the output module is automatically controlled, the stability of a live broadcast output sound signal is improved, and the live broadcast effect is ensured.
Further, referring to fig. 2, fig. 2 is a schematic circuit structure diagram of the new live microphone in this embodiment. The novel live microphone also comprises a first capacitor C1, a second capacitor C2 and a third capacitor C3;
the amplifying module 20 comprises a triode VT1, the specific model is PNP3014, the base of the triode VT1 is connected with one end of a first capacitor C1, the emitter is connected with one end of a second capacitor C2, and the sound pick-up 10 is connected with the other end of the first capacitor C1. The transistor VT1 is a low noise transistor with high output sensitivity and low background noise.
The volume control module 30 comprises a field effect transistor VT2, the specific model is 3DJ6, the drain of the field effect transistor VT2 is connected to the other end of the second capacitor C2, and the source is connected to one end of the third capacitor C3. The fet VT2 is a low noise fet that is used as a volume control element and outputs a signal with less noise and higher fidelity.
The second processing module 50 comprises a negative feedback module and a shaping and filtering module, one end of the negative feedback module is connected with the first processing module 40, the other end of the negative feedback module is connected with one end of the shaping and filtering module, and the other end of the shaping and filtering module is connected with the field effect transistor VT 2.
Specifically, the negative feedback module includes a fourth capacitance C6;
the first processing module 40 is specifically a signal processing chip IC1, the specific model is TDA2822, the signal processing chip IC1 is a low-noise IC, so that the output signal is clearer due to low background noise, a first pin (C) of the signal processing chip IC1 is connected with the other end of the third capacitor C3, a monitoring module 60 is connected in series between a second pin (r) and a third pin (C) of the signal processing chip IC1, and the monitoring module 60 is specifically a monitoring earphone and is used for monitoring the signal output from the second pin (r); the second pin (r) is also connected to an output module, i.e., CZ (signal output interface) in fig. 2, and the third pin (r) is also connected to one end of a fourth capacitor C6. The signal output interface CZ is specifically an output socket, and is connected in parallel to the monitoring earphone.
Further, the shaping filter module further comprises an adjustable resistor RP1, a diode VD1 and a fifth capacitor C4, wherein the specific model of the diode VD1 is 2AP 9;
the other end of the fourth capacitor C6 is connected with one end of an adjustable resistor RP1, the other end of the adjustable resistor RP1 is connected with the cathode of a diode VD1, the anode of the diode is connected with the grid of a field effect transistor VT2 and one end of a fifth capacitor C4, the other end of the fifth capacitor C4 is grounded and is also connected with one end of the sound pick-up 10 and a fourth pin (r) of a signal processing chip IC 1.
The adjustable resistor RP1 is a preset value, where the preset value is a resistance value of the current adjustable resistor RP1 when the sound pickup 10 obtains a pure tone signal with a preset frequency, and a waveform of the pure tone signal displayed by an oscilloscope serving as the output module 70 is undistorted. The pickup 10 may specifically be the MIC in fig. 2, and the manner of obtaining the resistance value is as follows: playing a pure tone signal of 1KHz (kilohertz) to the MIC, connecting an oscilloscope to the output end of the IC1, adjusting the adjustable resistor RP1 to make the amplitude of the waveform output by the oscilloscope equal to 1V, so that the waveform is undistorted, i.e. the current value of the adjustable resistor RP1 is the preset value, for example, 100K Ω (kiloohm).
The preferred values of the specification parameters of the above components are shown in fig. 2.
The working principle and the signal flow of the circuit shown in fig. 2 are as follows:
the sound pickup 10 converts the picked sound signal into the first electrical signal, and couples the first electrical signal to the base of the transistor VT1 through the first capacitor C1 in fig. 2, and the second electrical signal is amplified by the transistor VT1, and is output from the emitter of the transistor VT1, and is coupled between the drain of the field effect transistor VT2 and the source through the second capacitor C2, and is coupled to the first pin of the signal processing chip IC1 through the third capacitor C3, and becomes the third electrical signal after the power is amplified by the signal processing chip IC1, and is output from the second pin (r) and the third pin (C) and divided into three paths, the first path outputs the monitoring earphone driving the microphone and starts monitoring, the second path outputs the monitoring earphone driving the microphone to the output module 70 as the sound signal output outward, and the third path outputs the fourth capacitor C6 for negative feedback coupling, and is rectified by the adjustable resistor RP1, the diode VD1, and then filtered through the fifth capacitor C4, the obtained negative bias signal is applied to the grid of the field effect transistor VT2 to perform automatic volume control: when the negative bias signal is zero negative bias, the impedance between the drain and the source of the fet VT2 decreases, the amplitude of the transmission signal (i.e., the second electrical signal) increases, and further the signal output to the signal processing chip IC1 increases, i.e., the volume of the signal output to the headphone and the output module 70 increases, and at the same time, the signal negatively fed back from the fourth capacitor C6 also increases, so that the negative bias applied to the gate of the fet VT2 increases, the impedance between the drain and the source thereof increases, and the amplitude of the transmission signal (i.e., the second electrical signal) decreases, and further the signal output to the signal processing chip IC1 decreases, i.e., the volume of the signal output to the headphone and the output module 70 decreases, thereby dynamically and automatically adjusting the amplitude of the signal according to the magnitude of the negative bias value, and achieving the effect of automatically controlling the volume. And because the signal that monitoring earphone and output module 70 obtained is sent from the same pin, therefore do not receive the influence of external sound, the sound that the microphone monitoring earphone sent and the sound of exporting the platform from CZ end keep on the same volume all the time, have improved the efficiency and the stability of living broadcast of monitoring, avoid the two sound output inconsistent monitoring fault that causes to cause the bad influence to the live broadcast effect.
In this embodiment, the novel direct-broadcast microphone adopts a high-precision negative feedback control circuit of a field effect tube, so as to realize accurate automatic control of volume, the low-noise field effect tube is used as a volume control element, the output signal has lower noise and higher fidelity, so as to improve the stability of direct-broadcast signals, the signal processing chip adopts a low-noise IC, the triode adopts a low-noise triode which has higher output sensitivity and very low background noise, so that the output sound is clearer, the signals output from the signal processing chip are respectively output to a monitoring earphone for monitoring, an outward output platform is used for direct broadcast and a capacitor for performing negative feedback coupling, the signal of the negative feedback coupling is subjected to negative direction rectification filtering, an obtained negative bias signal is added to the grid electrode of the field effect tube for automatic volume control, when the negative bias signal is zero negative bias, the impedance between the drain electrode and the source electrode of the field effect tube is reduced, the transmission signal amplitude increases, and then to the signal increase of signal processing chip output, the signal volume increase of output for monitoring earphone and output module promptly, make the negative bias that adds to on the field effect transistor grid simultaneously increase, the impedance increase between field effect transistor drain electrode and the source electrode, the transmission signal amplitude diminishes, and then reduce to the signal of signal processing chip output, the signal volume that exports promptly for monitoring earphone and output module reduces, thereby form the big or small developments automatically regulated signal amplitude according to the negative bias value, reach the effect of automatic control volume. And because the signal that monitoring earphone and output module acquireed is sent from the same pin of signal processing chip, consequently not receive the influence of external sound, the sound that the microphone monitoring earphone sent and the sound of exporting the platform remain on same volume throughout, improved the efficiency of monitoring and the stability of live broadcast, avoid the two inconsistent monitoring errors that cause of sound output to cause the harmful effects to live broadcast effect.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above is right the utility model provides a novel live microphone's description, to the technical personnel in the field, according to the utility model discloses the thought of embodiment all has the change part on concrete implementation and application scope, to sum up, this description content should not be understood as right the utility model discloses a restriction.
Claims (8)
1. A novel live microphone, comprising:
the sound pick-up device comprises a sound pick-up, an amplification module, a volume control module, a first processing module, a second processing module, a monitoring module and an output module;
the amplification module is connected with the sound pickup and the volume control module, the first processing module is connected with the volume control module, the second processing module, the monitoring module and the output module, and the volume control module is also connected with the second processing module;
the sound pickup is used for picking up a sound signal, converting the sound signal into a first electric signal and then sending the first electric signal to the amplification module to be amplified into a second electric signal;
the volume control module is configured to receive the second electrical signal, send the second electrical signal to the first processing module for amplification to obtain a third electrical signal, and output the third electrical signal to drive the monitoring module to monitor, output the third electrical signal to the output module, and output the third electrical signal to the second processing module;
the second processing module is configured to process the received third electrical signal to generate a negative bias signal, and send the negative bias signal to the volume control module;
the volume control module is configured to dynamically adjust a self impedance according to a magnitude of a negative bias value of the negative bias signal, so that a magnitude of the second electrical signal sent to the first processing module changes in a direction opposite to a change of the self impedance of the volume control module, where a change direction of the self impedance of the volume control module is the same as a change direction of the negative bias value.
2. The novel direct broadcast microphone of claim 1, further comprising a first capacitor and a second capacitor;
the amplifying module comprises a triode, the base of the triode is connected with one end of the first capacitor, the other end of the first capacitor is connected with the sound pickup, and the emitting electrode of the triode is connected with one end of the second capacitor.
3. The novel direct broadcast microphone of claim 2, further comprising a third capacitor;
the volume control module includes: a field effect transistor;
and the drain electrode of the field effect transistor is connected with the other end of the second capacitor, and the source electrode of the field effect transistor is connected with one end of the third capacitor.
4. The novel live microphone of claim 3, wherein the second processing module comprises a negative feedback module and a shaping filtering module;
one end of the negative feedback module is connected with the first processing module, the other end of the negative feedback module is connected with one end of the shaping filtering module, and the other end of the shaping filtering module is connected with the field effect tube.
5. The novel live microphone of claim 4, wherein the negative feedback module comprises a fourth capacitor;
the first processing module is specifically a signal processing chip, a first pin of the signal processing chip is connected with the other end of the third capacitor, and the monitoring module is connected in series between a second pin and a third pin of the signal processing chip;
the second pin is further connected with the output module, and the third pin is further connected with one end of the fourth capacitor.
6. The novel live microphone of claim 5, wherein the shaping filter module further comprises an adjustable resistor, a diode, and a fifth capacitor;
the other end of the fourth capacitor is connected with one end of the adjustable resistor, the other end of the adjustable resistor is connected with the cathode of the diode, the anode of the diode is connected with the grid of the field effect transistor and one end of the fifth capacitor, and the other end of the fifth capacitor is grounded.
7. The novel live broadcast microphone as claimed in claim 6, wherein the resistance of the adjustable resistor is a preset value, and the preset value is a current resistance of the adjustable resistor corresponding to a situation that when the sound pickup acquires a pure tone signal with a preset frequency, an oscilloscope serving as the output module displays the pure tone signal without distortion in waveform.
8. The novel live microphone of claim 7, wherein the listening module is a listening headset.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113784257A (en) * | 2021-09-08 | 2021-12-10 | 深圳市长丰影像器材有限公司 | Multifunctional microphone |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113784257A (en) * | 2021-09-08 | 2021-12-10 | 深圳市长丰影像器材有限公司 | Multifunctional microphone |
| CN113784257B (en) * | 2021-09-08 | 2024-03-19 | 深圳市长丰影像器材有限公司 | Multifunctional microphone |
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