CN217509010U - Ultrasonic directional voice broadcasting device - Google Patents
Ultrasonic directional voice broadcasting device Download PDFInfo
- Publication number
- CN217509010U CN217509010U CN202221154148.7U CN202221154148U CN217509010U CN 217509010 U CN217509010 U CN 217509010U CN 202221154148 U CN202221154148 U CN 202221154148U CN 217509010 U CN217509010 U CN 217509010U
- Authority
- CN
- China
- Prior art keywords
- pin
- resistor
- capacitor
- voice
- audio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Circuit For Audible Band Transducer (AREA)
Abstract
The utility model discloses an ultrasonic wave directional pronunciation broadcaster relates to pronunciation digital signal processing technology field. The utility model comprises a voice playing circuit, a carrier amplifying circuit and an ultrasonic directional horn; the voice playing circuit comprises an mp3 decoding chip, an erasable memory, a USB interface, a TF card, five keys and a human body induction interface; the carrier amplifying circuit comprises a double operational amplifier, an audio interface, a voice processing chip and an audio power amplifying circuit; the audio power amplifying circuit comprises a first audio power amplifier and a second audio power amplifier, the ultrasonic directional horn comprises an array formed by 6 x N ultrasonic sensors which are arranged into a regular hexagon, and each ultrasonic sensor is connected in parallel. The utility model discloses have complete voice broadcast function, combine ultrasonic wave directional loudspeaker and voice broadcast unit organic, can carry out one-way sharp propagation, effectively stop the noise, the usage is extensive.
Description
Technical Field
The utility model belongs to the technical field of the processing of pronunciation digital signal, especially, relate to an ultrasonic wave directional pronunciation broadcasting equipment.
Background
The existing voice broadcasting systems, such as school broadcasting systems, traffic alarm prompters, coal mine alarm systems, voice advertising megaphones and the like, basically use common horns or gun barrel horns as sounding devices, and are characterized in that the sound is large, but the propagation mode of the system is diffused all around, 360-degree undifferentiated broadcasting is realized, the propagation distance of the system is in direct proportion to the power, and the system is in great relation to a resonant cavity.
The common horn sounding is that current draws a horn paper disc through a horn coil under the action of an electromagnetic field to generate air vibration and sound, and because an air medium is isotropic, the air medium is spread in a direction of 360 degrees without difference, sound cannot be transmitted in a targeted manner, so that unnecessary noise is generated, and normal life of people is influenced. Horns like square dance can seriously interfere with the normal rest of the community residents. Therefore, to solve this problem, a way to directionally propagate voice is needed, which only propagates in a certain direction by changing the transmission direction of voice by 360 °, so as to avoid unnecessary energy waste, and propagate further without affecting other unrelated people.
SUMMERY OF THE UTILITY MODEL
The utility model provides an ultrasonic wave directional voice broadcasting equipment has solved above problem.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme:
the utility model relates to an ultrasonic directional voice broadcasting device, which comprises a voice broadcasting circuit, a carrier amplifying circuit and an ultrasonic directional loudspeaker;
the voice playing circuit comprises an mp3 decoding chip, an erasable memory, a USB interface, a TF card, five keys and a human body induction interface;
the DP pin and the DM pin on the USB interface are respectively connected with a 21 pin and a 20 pin of an mp3 decoding chip; pins 1, 5 and 6 of the erasable memory are respectively connected with pins 13, 14 and 15 of the mp3 decoding chip; a first resistor is connected between pins 2 and 5 of the erasable memory; pins 3, 5 and 7 on the TF card are respectively connected with pins 17, 16 and 18 of the mp3 decoding chip; the 4 pins on the TF card are used as power supply ends to connect the second capacitor to the ground and the second resistor to the power supply respectively, and the 4 pins are grounded; one ends of the five keys are respectively connected with the pins 24, 23, 10, 8 and 7 of the mp3 decoding chip, and the other ends are all grounded; pins 1 and 3 of the human body induction interface are respectively connected with a power supply and the ground, and a pin 2 signal wire is connected with pin 1 of the mp3 decoding chip; a pin 5 on the mp3 decoding chip is an output port of one path of voice current signal DAC _ L, and a voice alternating current signal is sent to the amplification front end through the isolation of a third capacitor;
the carrier amplifying circuit comprises a double operational amplifier, an audio interface, a voice processing chip and an audio power amplifying circuit, wherein the double operational amplifier consists of a pre-modulation operational amplifying circuit and a post-modulation signal following processing circuit; the audio interface is connected with a DAC _ L end of a 5 pin on an mp3 decoding chip in parallel, the two paths are connected with a third resistor in a grounded mode after being connected, and are connected with a fourth resistor in series after being subjected to blocking and filtering by a fourth capacitor to be connected to the input cathode of the operational amplifying circuit before modulation, then a fifth resistor is connected to the output port of the operational amplifying circuit before modulation, the output port is connected with a sixth resistor in series, the other end of the sixth resistor is connected with a fifth capacitor and a sixth capacitor respectively, and the other end of the sixth capacitor is connected with a 22 pin on a voice processing chip; a seventh resistor is connected to the pin 3 of the pre-modulation operational amplification circuit from the power supply, an eighth grounded resistor is connected in parallel between the seventh resistor and the pin 3 of the pre-modulation operational amplification circuit, and a seventh capacitor is connected between the pin 3 of the pre-modulation operational amplification circuit and the ground; the pin 8 of the double operational amplifier is connected with a power supply, and the pin 4 is grounded;
a sound source input through the audio interface is amplified by the pre-modulation operational amplification circuit and then is internally modulated by the voice processing chip, and then the sound source is output to a 24 pin of the voice processing chip as a modulation waveform, wherein the 24 pin is connected with a ninth resistor, and the other end of the 24 pin is connected with a 5 pin of the modulated signal following processing circuit; the 6 pin and the 7 pin on the modulated signal following processing circuit are connected, and the whole modulated signal following processing circuit is used as an output end of the signal follower for outputting a modulated signal and enters the power amplifying circuit;
a pin 21 on the voice processing chip is connected with a ninth capacitor to the ground, a pin 5 on the voice processing chip is connected with the ground, a pin 6 on the voice processing chip is connected with a power supply, a pin 19 is connected with a tenth capacitor to the ground, and a pin 20 is connected with an eleventh capacitor to the ground; the voice processing chip is used for modulating the audio signal input by the 22 pin and outputting the modulated audio signal to the modulated signal following processing circuit from the 24 pin, and the modulated signal following processing circuit outputs the modulated audio signal to the audio power amplifying circuit;
the audio power amplifying circuit comprises a first audio power amplifier and a second audio power amplifier, and the output end of the modulation signal is amplified by the first audio power amplifier and the second audio power amplifier, transmitted to the ultrasonic directional loudspeaker and played; a first path of the output end of the modulation signal is connected to a pin 1 of the first audio power amplifier through a twelfth capacitor; the power supply is connected with a tenth resistor, the other end of the tenth resistor is connected with an eleventh resistor to be grounded, a connecting point of the tenth resistor and the eleventh resistor filters a thirteen-capacitor grounded to the ground, and the connecting point is connected with a twelfth resistor to a pin 1 of the first audio power amplifier to provide bias voltage; the 2 feet of the first audio power amplifier are respectively connected with a thirteenth resistor, a fourteenth resistor and a thirteenth capacitor, the other end of the thirteenth resistor is connected with the fourteenth capacitor and is grounded, the other end of the fourteenth resistor is connected with the thirteenth capacitor, the fourteenth resistor and the thirteenth capacitor are connected to the 4 feet of the first audio power amplifier together, and then the pins are connected with the anode of the ultrasonic directional loudspeaker;
the second path of the output end of the modulation signal is connected with a fifteenth capacitor, the other end of the output end of the modulation signal is connected with a fifteenth resistor to a pin 2 of a second audio power amplifier, the pin 2 is simultaneously connected with a sixteenth resistor and a sixteenth capacitor, and the other ends of the sixteenth resistor and the sixteenth capacitor are connected to a pin 4 of the second audio power amplifier and then connected to the cathode of the ultrasonic directional loudspeaker; the power supply is connected with a seventeenth resistor, the other end of the seventeenth resistor is connected with an eighteenth resistor to the ground, the connecting point of the seventeenth resistor and the eighteenth resistor is grounded and connected with a seventeenth capacitor for filtering, and the connecting point is connected with a pin 1 of the second audio power amplifier for providing bias voltage;
the ultrasonic directional horn comprises an array formed by 6 × N ultrasonic sensors which are arranged into a regular hexagon, N is the number of the ultrasonic sensors arranged on one side of the array, and each ultrasonic sensor is connected in parallel.
Further, the erasable memory is a FLASH memory.
Further, the mp3 decoding chip is an AC6084 chip of Jergh corporation.
Furthermore, pins 3, 7 and 8 of the erasable memory are all connected to a power supply, and pin 4 is grounded; a first capacitor is connected between the power supply and the ground near the erasable memory as a power supply filter capacitor.
Furthermore, pins 10, 11, 12 and 13 on the TF card are all grounded.
Further, a pin 4 of the mp3 decoding chip is connected with a third capacitor to the ground, pins 11 and 12 are respectively connected with a power supply, and pins 3 and 9 are respectively connected with the ground.
Further, the voice processing chip specifically adopts an E901A chip, and is designed and packaged into an SSOP24 package form based on a wafer of core-bearing microelectronics H9T56 QP.
Furthermore, an eighth capacitor is connected to the ground along with the 5 pins of the processing circuit for filtering.
Furthermore, the power supply vicinities of the first audio power amplifier and the second audio power amplifier are respectively connected with an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor and a twenty-first capacitor in a grounded manner to serve as power supply filter capacitors.
Compared with the prior art, the utility model following beneficial effect is included:
the utility model discloses an ultrasonic wave directional voice broadcaster voice broadcast circuit, carrier amplification circuit and ultrasonic horn for ultrasonic wave directional loudspeaker on the existing market not only exists as solitary broadcast device, has complete voice broadcast function, combines ultrasonic wave directional loudspeaker and voice broadcast unit organic, can carry out one-way rectilinear propagation, effectively stops the noise, and the usage is extensive.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of a voice broadcasting circuit of an ultrasonic directional voice broadcaster according to the present invention;
fig. 2 is a schematic diagram of a carrier amplifying circuit in an ultrasonic directional voice broadcaster according to the present invention;
FIG. 3 is a schematic diagram of normal speaker playing and directional speaker playing;
FIG. 4 is a modulation waveform diagram;
FIG. 5 is a schematic block diagram of the circuit of the present invention;
fig. 6 is a schematic front view of the ultrasonic directional horn of the present invention;
FIG. 7 is a schematic diagram of the structure of the transmitting and receiving components of the ultrasonic sensor;
FIG. 8 is a pin diagram of an SSOP 24-based package of an E901A-P24 chip used in the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
u1-mp3 decoding chip, U2-erasable memory, C3-first capacitor, C4-second capacitor, C2-third capacitor, C11-fourth capacitor, C11-fifth capacitor, C11-sixth capacitor, C11-seventh capacitor, C11-eighth capacitor, C11-ninth capacitor, C11-tenth capacitor, C11-eleventh capacitor, C11-twelfth capacitor, C11-thirteenth capacitor, C11-fourteenth capacitor, C11-fifteenth capacitor, C11-sixteenth capacitor, C11-seventeenth capacitor, C11-eighteenth capacitor, C11-nineteenth capacitor, C11-twentieth capacitor, C11-twenty-first capacitor, K11-key, U4 11-modulating circuit, U364-amplifying circuit, U11-signal processing circuit, u4-double operational amplifier, J1-human body induction interface, J2-audio interface, R1-first resistor, R2-second resistor, R9-third resistor, R10-fourth resistor, R13-fifth resistor, R14-sixth resistor, R12-seventh resistor, R11-eighth resistor, R4-ninth resistor, R15-tenth resistor, R17-eleventh resistor, R16-twelfth resistor, R18-thirteenth resistor, R19-fourteenth resistor, R22-fifteenth resistor, R23-sixteenth resistor, R21-seventeenth resistor, and R20-eighteenth resistor.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in figure 3, the general horn is a schematic diagram of playing of a general horn and a directional horn, the general horn draws a horn paper disc through a horn coil under the action of a magnetic field to generate air vibration and sound, and because an air medium is isotropic, the propagation mode of the general horn is indifference diffusion in 360 degrees, the sound cannot be propagated pertinently, so that unnecessary noise can be generated, the normal life of people is influenced, and if the horn of a square dance can seriously interfere with the normal rest of residents in a residential area. Therefore, to solve the problem, it is necessary to find a way to transmit the voice directionally, that is, to change the transmission direction of the voice by 360 ° and only transmit the voice to a certain direction, which causes unnecessary energy waste, can transmit the voice farther, and does not affect other unrelated people.
As shown in fig. 3, the ultrasonic directional horn is directed to transmit in one direction, as opposed to a laser beam, essentially straight, with a small fan angle, and the sound is pushed forward, not 360 °; the ultrasonic directional horn in the market at present only exists as an independent playing device, and the ultrasonic directional horn comprises a modulation driving part, so that an effective and complete voice playing system is lacked; the existing playing advertisements basically adopt coil loudspeakers, so that a lot of unnecessary environmental noises are artificially produced for achieving a single playing function; based on the defects of the existing common voice broadcasting system, the technical scheme is to organically combine the ultrasonic directional loudspeaker and the voice playing unit, so that a very complete and convenient application approach is achieved.
The ultrasonic directional voice broadcaster is used in public places such as subways, railways, buses, exhibitions, markets, hospitals, schools and the like, so that noise can be effectively prevented from being generated, information can be played more accurately, and people are not disturbed; for example, through using ultrasonic wave directional voice advertisement broadcast in the supermarket, can be targeted to different regional product propaganda propelling movement, can make customer reach better experience, can ensure the definition of audio moreover, let the market form each independent space, make the market wholly keep a comfortable environment of relative silence.
Referring to fig. 1-2 and fig. 4-8, an ultrasonic directional voice broadcaster of the present invention includes a voice broadcasting circuit, a carrier amplifying circuit and an ultrasonic directional speaker;
the voice playing circuit comprises an mp3 decoding chip U1, an erasable memory U2, a USB interface, a TF card, five keys K1, K2, K3, K4 and K5, and a human body induction interface J1; the MP3 decoding chip U1 specifically adopts an AC6084 chip of Jely corporation, and has the main functions of simultaneously supporting TF cards and USB downloading and supporting MP3 and WAV formats; the erasable memory U2 is a FLASH memory, in which the voice data is placed, and the voice file can be directly copied from the computer through USB interface. After the USB of the computer is connected, the flash space is equivalent to a U disk, and the program is provided with an FAT file system; during playing, the priority of the TF card is higher than that of the flash. After receiving the playing command, the system firstly plays the content on the TF card, and if the TF card is not inserted, the system plays the voice of the internal flash;
the DP pin and the DM pin on the USB interface are respectively connected with a 21 pin (USBDP) and a 20 pin (USBDM) of an mp3 decoding chip U1, and the hardware is USB 2.0; the TF card supports the maximum capacity of 32G; pins 1 (/ CS), 5 (SI) and 6 (SCK) of the erasable memory U2 are respectively connected with pins 13, 14 and 15 of the mp3 decoding chip U1; a first resistor R1(100R) is connected between pin 2 (SO) and pin 5 (SI) of the erasable memory U2; pins 3, 5 and 7 (HOLD) on the TF card are respectively connected with pins 17, 16 and 18 of the mp3 decoding chip U1; 4 pins on the TF card are used as power supply ends to be respectively connected with a second capacitor C4 to the ground and a second resistor R2 to a 3.3V power supply, and the 4 pins are grounded; one ends of the five keys K1, K2, K3, K4 and K5 are respectively connected with a pin 24, a pin 23, a pin 10, a pin 8 and a pin 7 of the mp3 decoding chip U1, and the other ends of the five keys are grounded; the 1 pin and the 3 pins of the human body induction interface J1 are respectively connected with a 3.3V power supply and the ground, and a 2-pin signal wire (PIR) is connected with the 1 pin of the mp3 decoding chip U1; when the signal wire jumps, the human body sensing module detects the infrared ray of the human body and a person approaches, and the main control unit is informed to play a relevant voice response; pins 10, 11, 12 and 13 on the TF card are all grounded to form a hardware card reading connection;
a pin 5 on the mp3 decoding chip U1 is an output port of a voice current signal DAC _ L, and a voice alternating current signal is sent to the front end of the amplifier through the isolation of a third capacitor C2; the 3 pin (/ WP), the 7 pin (HOLD) and the 8 pin (VCC) of the erasable memory U2 are all connected to a 3.3V power supply, and the 4 pin is grounded; a first capacitor C3 is connected between a power supply and the ground close to the erasable memory U2 and serves as a power supply filter capacitor;
as shown in fig. 2, the carrier amplifying circuit includes a dual operational amplifier U4 composed of a pre-modulation operational amplifying circuit U4A and a post-modulation signal following processing circuit U4B, an audio interface J2, a voice processing chip U3, and an audio power amplifying circuit; in this embodiment, the sound source is derived from two parts, one part is input from the audio interface J2, the other part is that the audio interface J2 is connected in parallel with the DAC _ L end of the 5 pin on the mp3 decoding chip U1, and the two parts are connected to the ground and then connected to the third resistor R9 to serve as signal attenuation, so as to prevent distortion due to too large volume.
After signal attenuation, a fourth capacitor C11 is used for filtering the signal, then the signal is connected in series with a fourth resistor R10 to the input negative electrode of the operational amplifying circuit U4A before modulation, then the signal is connected with a fifth resistor R13 to the output port of the operational amplifying circuit U4A before modulation, the output port is connected in series with a sixth resistor R14, the other end of the sixth resistor R14 is respectively connected with a fifth capacitor C9 and a sixth capacitor C8, the other end of the sixth capacitor C8 is connected with a pin 22 (MIC +) on a voice processing chip U3, and the amplified signal is input into the voice processing chip U3 for modulation processing;
a pin 3 (input positive electrode) of the pre-modulation operational amplification circuit U4A provides a bias potential for a signal, a seventh resistor R12 is connected to the pin 3 of the pre-modulation operational amplification circuit U4A from a power supply, an eighth resistor R11 which is grounded is connected between the seventh resistor R12 and the pin 3 of the pre-modulation operational amplification circuit U4A in parallel, and a seventh capacitor C10 is connected between the pin 3 of the pre-modulation operational amplification circuit U4A and the ground; the pin 8 of the dual operational amplifier U4 is connected with a power supply, and the pin 4 is connected with the ground; 4 pins of a mp3 decoding chip U1 are connected with a third capacitor C2 to the ground, 11 pins and 12 pins are respectively connected with a power supply, and 3 pins and 9 pins are respectively connected with the ground;
then the sound source is amplified and sorted by the pre-modulation operational amplifier circuit U4A, the sound source inputted via the audio interface J2 is amplified by the pre-modulation operational amplifier circuit U4A, and is internally modulated by the voice processing chip U3, and is outputted to the 24 pins of the voice processing chip U3 as a modulated waveform, the 24 pins are connected with the ninth resistor R4, and the other end is connected with the 5 pins (input positive electrode) of the modulated signal following processing circuit U4B; the 6 pin (input negative pole) on the modulated signal following processing circuit U4B is connected with the 7 pin (output), and the whole modulated signal following processing circuit U4B is used as the output end of the signal follower for outputting a modulated signal and enters the power amplifying circuit;
a pin 21 on the voice processing chip U3 is connected with the ninth capacitor C7 to the ground, a pin 5 on the voice processing chip U3 is connected with the ground, a pin 6 is connected with the power supply, a pin 19 is connected with the tenth capacitor C5 to the ground, and a pin 20 is connected with the eleventh capacitor C6 to the ground; the voice processing chip U3 is used for modulating the audio signal input by the 22 pin and outputting the modulated audio signal from the 24 pin to the modulated signal following processing circuit U4B, and outputting the modulated signal following processing circuit U4B to the audio power amplifying circuit;
the audio power amplifying circuit comprises a first audio power amplifier U5 and a second audio power amplifier U6, the output end of the modulation signal is amplified by the first audio power amplifier U5 and the second audio power amplifier U6, and then the audio is played after being transmitted to the ultrasonic directional horn; the modulation signal is divided into two paths;
a first path of the output end of the modulation signal is connected to a pin 1 of the first audio power amplifier U5 through a twelfth capacitor C13; meanwhile, a bias voltage is provided for the modulation signal, the modulation signal is connected with a tenth resistor R15 from a power supply, the other end of the tenth resistor R15 is connected with an eleventh resistor R17 to be grounded, a connecting point of the tenth resistor R15 and the eleventh resistor R17 filters a thirteen-resistor-grounded-ground capacitor C16, and the connecting point is connected with a twelfth resistor R16 to a pin 1 (input anode) of the first audio power amplifier U5 to provide the bias voltage; a pin 2 of the first audio power amplifier U5 is respectively connected with a thirteenth resistor R18, a fourteenth resistor R19 and a thirteenth capacitor C18, the other end of the thirteenth resistor R18 is connected with a fourteenth capacitor C17 which is grounded, the other end of the fourteenth resistor R19 is connected with a thirteenth capacitor C18, the other ends of the thirteenth resistor R19 and the thirteenth capacitor C18 are connected with a pin 4 (output) of the first audio power amplifier U5, and then the pin 2 is connected with the anode of the ultrasonic directional horn;
the second path of the output end of the modulation signal is connected with a fifteenth capacitor C22, the other end of the output end of the modulation signal is connected with a pin 2 (input cathode) of a fifteenth resistor R22-to-a second audio power amplifier U6, the pin 2 is simultaneously connected with a sixteenth resistor R23 and a sixteenth capacitor C23, and the other ends of the sixteenth resistor R23 and the sixteenth capacitor C23 are connected with a pin 4 (output) of the second audio power amplifier U6 and then connected to the cathode of the ultrasonic directional horn; similarly, in order to provide a bias voltage for the modulation signal, the seventeenth resistor R21 is connected from the power supply, the other end of the seventeenth resistor R21 is connected with the eighteenth resistor R20 to the ground, the connection point of the seventeenth resistor R21 and the eighteenth resistor R20 is connected with the seventeenth capacitor C19 for filtering, and the connection point is connected with the pin 1 (input positive electrode) of the second audio power amplifier U5 to provide the bias voltage;
the voice processing chip U3 specifically adopts an E901A-P24 chip, and is designed and packaged into a package form of SSOP24 based on a wafer of core-bearing microelectronics H9T56QP, and specific pins thereof are shown in fig. 8, and functions of the pins are shown in table 1 below:
| pin order number | Pin name | Description of |
| 1 | EQI | And integrating the negative electrode of the operational amplifier input end. |
| 2 | EQO | And integrating operational amplifier output ends. |
| 3 | SP+ | And (5) outputting the positive pole of the horn. |
| 4 | SP- | And outputting by a cathode of the horn. |
| 5 | GND | The negative pole of the system power supply. |
| 6 | VCC | And (4) a system power supply anode. |
| 7 | VPP | And burning the positive electrode of the power supply. |
| 8 | P00 | P00 input and output. The sleep state may be awakened. OPA _ O output. |
| 9 | P01 | P01 input and output. The sleep state may be awakened. OPB _ O output. |
| 10 | P04 | P04 input and output. The sleep state may be awakened. OPB _ N input. |
| 11 | P05 | P05 input and output. The sleep state may be awakened. OPB _ P input. |
| 12 | P08 | P08 inputs and outputs. The sleep state may be awakened. The SCK interface of SPI. |
| 13 | P09 | P09 input and output. The sleep state may be awakened. The MISO/IO1 interface of the SPI. |
| 14 | P10 | P10 input and output. The sleep state may be awakened. The MOSI/IO0 interface of SPI. |
| 15 | P11 | P11 input and output. The sleep state may be awakened. SPI IO2 interface. PWM-0. |
| 16 | P12 | P12 input and output. Can be used forWaking up the sleep state. PWM-1. |
| 17 | P20 | P20 input and output. 2-40M crystal oscillator input interface. |
| 18 | P21 | P21 input and output. 2-40M crystal oscillator output interface. |
| 19 | RSTB | A system external reset port. |
| 20 | LDO | The system has 2.6V/2.8V/3.0V/3.2V internal voltage-stabilizing output. The voltage is selectable. |
| 21 | MIC- | MIC input negative. |
| 22 | MIC+ | MIC input positive. |
| 23 | MIC_AMP | And (5) pre-amplifying output of the MIC. |
| 24 | DAC | And outputting the DAC signal. |
Table 1: pin function specification table for E901A-P24 chip
An eighth capacitor C12 is connected to the ground along with a pin 5 on the processing circuit U4B for filtering.
Because the power of the first audio power amplifier U5 and the power of the second audio power amplifier U6 are relatively large, an eighteenth capacitor C14, a nineteenth capacitor C15, a twentieth capacitor C20 and a twenty-first capacitor C21 are respectively connected to the ground near the power supplies of the first audio power amplifier U5 and the second audio power amplifier U6, and serve as power supply filter capacitors.
As shown in fig. 3-7, the ultrasonic directional horn includes an array of 6 × N ultrasonic sensors arranged in a regular hexagon, where N is the number of ultrasonic sensors disposed on a single side of the array, and each ultrasonic sensor is connected in parallel; in this specific embodiment, N is specifically 12, specifically, as shown in fig. 6, the N is arranged in three rows of trapezoids, a first row is 3 ultrasonic sensors, a second row is 4 ultrasonic sensors, and a third row is 5 ultrasonic sensors; the amount of power, the amount of sound and the distance of propagation are proportional to the particles. Therefore, the number of the ultrasonic sensors can be adjusted according to different occasions.
As shown in fig. 4, the working principle of the ultrasonic horn is to modulate an audio signal onto a carrier frequency band of the ultrasonic sensor, and then to utilize the directional propagation characteristic of ultrasonic waves to make sound realize directional propagation. As shown in fig. 7, the structure diagram of the ultrasonic sensor of the present embodiment is generally two types, transmission and reception, and in this example, the transmission type is used, and many ultrasonic sensors can function as both transmission and reception. The ultrasonic transducer is different from any conventional loudspeaker unit, but utilizes the piezoelectric effect of its structure to generate two ultrasonic beams which are specially processed, the ultrasonic playing frequency is close to the resonance frequency, when two beams act on the eardrum of human ear simultaneously, the acoustic effect can be produced by mutual acoustic wave interference, the acoustic effect is strange, like talking or singing at ear, and one ultrasonic beam acts on the eardrum and cannot hear any sound. Due to the strong ultrasonic velocity and controllable directivity, the intersection of the two ultrasonic beams forms a sound-returning area with a small range, and when the human ear is in the area, the sound can be heard, but the human ear cannot hear once the human ear leaves the area.
As shown in fig. 5, a schematic circuit diagram is shown, sound source data including MP3 or WAV format is copied to a TF card or an internal flash via a USB, after power-on, the time of playing is determined via a human body induction module connected to a human body induction interface J1 and 5 keys K1-K5, and after being modulated and amplified by a modulation module, a voice signal is sent to an ultrasonic horn for playing, which is determined by a main control chip.
The directional loudspeaker playing system comprises the following parts: (1)5 play buttons (play, previous song, next song, volume up and volume down), and single song play, single song cycle play, multi-song cycle play and the like can be realized through the 5 buttons. Adapted to continuously broadcast prompts and warnings; (2) and 1, triggering and playing by the personal induction probe. Triggering playing when someone passes by; (3) the voice copy can be copied to the internal memory space of the circuit board and the external TF card through USB, wherein the external TF is preferentially identified. The USB cable is connected with a computer, and the internal storage space is a USB flash disk; (4) the voice control playing module is used for sending the voice signal to the modulation module; (5) and the ultrasonic wave modulation module is used for modulating the voice signal into an ultrasonic wave carrier signal.
The utility model discloses an ultrasonic wave directional voice broadcaster voice broadcast circuit, carrier amplification circuit and ultrasonic horn for ultrasonic wave directional loudspeaker on the existing market not only exists as solitary broadcast device, has complete voice broadcast function, combines ultrasonic wave directional loudspeaker and voice broadcast unit organic, can carry out one-way rectilinear propagation, effectively stops the noise, and the usage is extensive.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. An ultrasonic directional voice broadcaster is characterized by comprising a voice playing circuit, a carrier amplifying circuit and an ultrasonic directional loudspeaker;
the voice playing circuit comprises an mp3 decoding chip (U1), an erasable memory (U2), a USB interface, a TF card, five keys (K1, K2, K3, K4 and K5) and a human body induction interface (J1);
the DP pin and the DM pin on the USB interface are respectively connected with the 21 pin and the 20 pin of an mp3 decoding chip (U1); pins 1, 5 and 6 of the erasable memory (U2) are respectively connected with pins 13, 14 and 15 of the mp3 decoding chip (U1); a first resistor (R1) is connected between pins 2 and 5 of the erasable memory (U2); pins 3, 5 and 7 on the TF card are respectively connected with pins 17, 16 and 18 of an mp3 decoding chip (U1); the 4 pins on the TF card are used as power supply ends to connect the second capacitor (C4) to the ground and the second resistor (R2) to the power supply respectively, and the 4 pins are grounded; one ends of the five keys (K1, K2, K3, K4 and K5) are respectively connected with a pin 24, a pin 23, a pin 10, a pin 8 and a pin 7 of the mp3 decoding chip (U1), and the other ends are all grounded; the 1 pin and the 3 pin of the human body induction interface (J1) are respectively connected with a power supply and the ground, and the 2 pin signal wire is connected with the 1 pin of the mp3 decoding chip (U1); 5 pins on an mp3 decoding chip (U1) are output ports of a voice current signal DAC _ L, and voice alternating current signals are sent to the front end of amplification through isolation of a third capacitor (C2);
the carrier amplifying circuit comprises a double operational amplifier (U4) consisting of a pre-modulation operational amplifying circuit (U4A) and a post-modulation signal following processing circuit (U4B), an audio interface (J2), a voice processing chip (U3) and an audio power amplifying circuit; the audio interface (J2) and a DAC _ L end of a 5-pin on an mp3 decoding chip (U1) are connected together in parallel, two paths are connected and then are connected with a third resistor (R9) in a grounded mode, a fourth resistor (R10) is connected in series after being isolated and filtered by a fourth capacitor (C11) and then is connected with the input negative electrode of a pre-modulation operational amplification circuit (U4A), then the audio interface is connected with a fifth resistor (R13) to the output port of the pre-modulation operational amplification circuit (U4A), the output port is connected with a sixth resistor (R14) in series, the other end of the sixth resistor (R14) is connected with a fifth capacitor (C9) and a sixth capacitor (C8) respectively, and the other end of the sixth capacitor (C8) is connected with a 22-pin on the voice processing chip (U3); a seventh resistor (R12) is connected to the 3 pin of the pre-modulation operational amplification circuit (U4A) from a power supply, an eighth resistor (R11) which is grounded is connected in parallel between the seventh resistor (R12) and the 3 pin of the pre-modulation operational amplification circuit (U4A), and a seventh capacitor (C10) is connected between the 3 pin of the pre-modulation operational amplification circuit (U4A) and the ground; the pin 8 of the double operational amplifier (U4) is connected with a power supply, and the pin 4 is connected with the ground;
a sound source input by an audio interface (J2) is amplified by a pre-modulation operational amplifier circuit (U4A), is internally modulated by a voice processing chip (U3), and is output to a 24 pin of the voice processing chip (U3) as a modulation waveform, wherein the 24 pin is connected with a ninth resistor (R4), and the other end of the modulation waveform is connected with a 5 pin of a modulated signal following processing circuit (U4B); the 6 pin and the 7 pin on the modulated signal following processing circuit (U4B) are connected, and the whole modulated signal following processing circuit (U4B) is used as the output end of the signal follower for outputting a modulated signal and enters the power amplifying circuit;
a pin 21 on the voice processing chip (U3) is connected with a ninth capacitor (C7) to the ground, a pin 5 on the voice processing chip (U3) is connected with the ground, a pin 6 is connected with the power supply, a pin 19 is connected with a tenth capacitor (C5) to the ground, and a pin 20 is connected with an eleventh capacitor (C6) to the ground; the voice processing chip (U3) is used for modulating the audio signal input by the 22 pin and outputting the modulated audio signal from the 24 pin to the modulated signal following processing circuit (U4B), and outputting the modulated signal following processing circuit (U4B) to the audio power amplifying circuit;
the audio power amplifying circuit comprises a first audio power amplifier (U5) and a second audio power amplifier (U6), the output end of the modulation signal is amplified by the first audio power amplifier (U5) and the second audio power amplifier (U6), and then is transmitted to the ultrasonic directional horn to play the audio; the first path of the output end of the modulation signal is connected to a pin 1 of a first audio power amplifier (U5) through a twelfth capacitor (C13); a tenth resistor (R15) is connected with a power supply, the other end of the tenth resistor (R15) is connected with an eleventh resistor (R17) to be grounded, a connecting point of the tenth resistor (R15) and the eleventh resistor (R17) filters a thirteen-capacitor (C16) which is grounded, and a connecting point is connected with a twelfth resistor (R16) to a pin 1 of a first audio power amplifier (U5) to provide bias voltage; a pin 2 of a first audio power amplifier (U5) is respectively connected with a thirteenth resistor (R18), a fourteenth resistor (R19) and a thirteenth capacitor (C18), the other end of the thirteenth resistor (R18) is connected with a fourteenth capacitor (C17) which is grounded, the other end of the fourteenth resistor (R19) is connected with a thirteenth capacitor (C18), the other ends of the fourteenth resistor (R19) and the thirteenth capacitor (C18) are connected with a pin 4 of the first audio power amplifier (U5) together, and then the positive pole of the ultrasonic directional horn is connected;
the second path of the output end of the modulation signal is connected with a fifteenth capacitor (C22), the other end of the output end of the modulation signal is connected with a fifteenth resistor (R22) to a pin 2 of a second audio power amplifier (U6), the pin 2 is simultaneously connected with a sixteenth resistor (R23) and a sixteenth capacitor (C23), and the other ends of the sixteenth resistor (R23) and the sixteenth capacitor (C23) are connected to a pin 4 of the second audio power amplifier (U6) and then connected to the negative electrode of the ultrasonic directional horn; the seventeenth resistor (R21) is connected with the power supply, the other end of the seventeenth resistor (R21) is connected with the eighteenth resistor (R20) to the ground, the connection point of the seventeenth resistor (R21) and the eighteenth resistor (R20) is grounded and connected with the seventeenth capacitor (C19) for filtering, and the connection point is connected with a pin 1 of the second audio power amplifier (U6) to provide bias voltage;
the ultrasonic directional horn comprises an array formed by 6 × N ultrasonic sensors which are arranged into a regular hexagon, N is the number of the ultrasonic sensors arranged on one side of the array, and each ultrasonic sensor is connected in parallel.
2. An ultrasonic directional speech broadcaster as claimed in claim 1, characterised in that said erasable memory (U2) is embodied by FLASH memory.
3. An ultrasonic directional speech broadcaster as claimed in claim 1, characterised in that said mp3 decoder chip (U1) is embodied in the chip model AC6084 from Jeleans corporation.
4. An ultrasonic directional voice broadcaster as claimed in claim 1, wherein pins 3, 7 and 8 of said rewritable memory (U2) are all connected to a power supply, pin 4 is connected to ground; a first capacitor (C3) is connected between the power supply and the ground near the erasable memory (U2) and is used as a power supply filter capacitor.
5. An ultrasonic directional voice broadcaster as claimed in claim 1, wherein pins 10, 11, 12, 13 of said TF card are grounded.
6. An ultrasonic directional speech broadcaster as claimed in claim 1, characterised in that said mp3 decoder chip (U1) has a 4-pin connection of a third capacitor (C2) to ground, pins 11 and 12 to power supply, pins 3 and 9 to ground, respectively.
7. An ultrasonic directional speech broadcaster as claimed in claim 1, characterised in that said speech processing chip (U3), specifically an E901A chip, is designed and packaged in the form of an SSOP24 package based on a wafer-based on core-bearing microelectronics H9T56 QP.
8. An ultrasonic directional voice broadcaster as claimed in claim 1, wherein said satellite processing circuit (U4B) has an eighth capacitor (C12) connected to ground at pin 5 for filtering.
9. An ultrasonic directional voice broadcaster as claimed in claim 1, wherein said power supply vicinities of said first audio power amplifier (U5) and said second audio power amplifier (U6) are grounded with an eighteenth capacitor (C14), a nineteenth capacitor (C15), a twentieth capacitor (C20) and a twenty-first capacitor (C21), respectively, as power filter capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221154148.7U CN217509010U (en) | 2022-05-14 | 2022-05-14 | Ultrasonic directional voice broadcasting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221154148.7U CN217509010U (en) | 2022-05-14 | 2022-05-14 | Ultrasonic directional voice broadcasting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217509010U true CN217509010U (en) | 2022-09-27 |
Family
ID=83353238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221154148.7U Active CN217509010U (en) | 2022-05-14 | 2022-05-14 | Ultrasonic directional voice broadcasting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217509010U (en) |
-
2022
- 2022-05-14 CN CN202221154148.7U patent/CN217509010U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ATE271740T1 (en) | CARD READER FOR TRANSMITTING DATA THROUGH SOUNDS | |
| CN105245991A (en) | Head-mounted karaoke singing earphone and karaoke singing processing method | |
| CN217509010U (en) | Ultrasonic directional voice broadcasting device | |
| CN103402156A (en) | Acoustic system | |
| Mydlarz et al. | The implementation of mems microphones for urban sound sensing | |
| CN103413511A (en) | Voice navigation system | |
| CN203444427U (en) | Sound production pen | |
| CN203151724U (en) | Bluetooth subwoofer combined sound box | |
| CN212544037U (en) | Live broadcast microphone with function of changing pickup range | |
| CN209642950U (en) | A kind of directional loudspeaker reducing noise | |
| CN216122807U (en) | Intelligent broadcasting earphone with RFID reading function | |
| CN211406261U (en) | Computer multimedia loudness control circuit | |
| CN111767083A (en) | Method for collecting false wake-up audio data, playing device, electronic device and medium | |
| CN203760070U (en) | Electroacoustic Ruan | |
| CN212134931U (en) | Digital microphone runway circular matrix sound source positioning system | |
| CN217011167U (en) | Intelligent audio super-directional playing device | |
| CN218336391U (en) | Self-adaptation environment automatically regulated sleep sound system | |
| CN214315522U (en) | Multifunctional electrified education active loudspeaker system | |
| CN101984555A (en) | Parametric array audio play system | |
| CN209267754U (en) | A kind of mouth organ microphone | |
| JPH10225349A (en) | Frame with built-in sound device | |
| CN213279998U (en) | Noise reduction sound box control system based on 5G communication | |
| CN216643876U (en) | Classroom eyeshield lamp with megaphone | |
| CN210072958U (en) | Antenatal training instrument with bone conduction function | |
| CN212628277U (en) | Live broadcast sound box system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |