CN210721112U - Singlechip pronunciation extension control circuit - Google Patents

Abstract

The utility model discloses a singlechip pronunciation extension control circuit belongs to pronunciation broadcast control technical field. The utility model comprises a power supply unit, a control unit, a position selection extension unit and a trigger unit, wherein the position selection extension unit comprises a 3-8 decoder position selection submodule and a 9-line single-control position selection submodule, and the trigger unit comprises 8 relay groups and a ground control special relay; the power supply unit is electrically connected with each module for supplying power, the singlechip output terminal of the control unit is electrically connected with the 3-8 decoder bit selection module and the 9-wire single control bit selection module, and the control bit selects the output signal of the expansion unit; and the output terminals of the 3-8 decoder bit selection module and the 9-wire single-control bit selection module are connected with the input terminals of the 8-path relay group and the ground control special relay. The utility model discloses trigger the relay that corresponds under the control of singlechip, can make full use of and extension control port, compare in traditional pronunciation broadcast circuit board, the audio frequency quantity that can broadcast is increased.

Description

Singlechip pronunciation extension control circuit

Technical Field

The utility model relates to a pronunciation broadcast control technical field, more specifically say, relate to a singlechip pronunciation extension control circuit.

Background

In daily life, people need to determine the condition of a person, an event and an object at a certain moment according to various alarm prompting signals, the sound signals belong to one type, and are widely applied due to the fact that the sound signals are consistent with the expression mode of spoken language used for communication and exchange between people, how to manufacture a modularized multi-channel voice playing module by means of an electronic hardware technology and implement accurate playing control on a certain audio file stored in the module by means of an electronic software technology and send out personalized voice alarm prompting signals with variable contents is an extremely important practical requirement in the technical field of voice playing control.

To address this practical requirement, a variety of multi-channel voice playing modules have been sold in the market, and usually use an SD card as a storage medium, which limits the number of voice plays to some extent. The existing common voice trigger control modes are a manual trigger mode and an automatic trigger mode, the manual trigger mode comprises three one-to-one ground trigger modes of a direct wiring type, a key type and a switch conduction type, the number of used electronic devices is large, and the trigger cost is increased. In addition, because the number of the I/O interfaces of the singlechip is limited and other peripheral equipment also needs to occupy the I/O interfaces, the utilization rate of the I/O interfaces of the singlechip is low, the waste of I/O interface resources of the singlechip is caused, and in addition, the number of voice playing channels is also limited by the one-to-one triggering mode.

Through search, Chinese patent application No. 201220342548.0, the application date is 2012, 7 and 16, the name of the invention is: the utility model provides a board is played to pronunciation, this application includes microcontroller, SD card slot, power input port, audio output port, control line wiring end and matrix keypad, microcontroller links to each other with SD card slot, power input port, audio output port, control line wiring end and matrix keypad respectively. The application can use a common SD card as a storage medium, and any voice file within 30 files in the SD card can be conveniently played without limiting the source of the SD card. However, the audio files of the application are stored in a single manner, which cannot meet the popular requirements, and the number of the audio files that can be selectively played is limited.

The Chinese patent number ZL201521063163.0, the date of the granted announcement is 2016, 6 and 8, and the name of the invention creation is as follows: the application discloses a battery selection device in an expandable series battery pack, which comprises a single chip microcomputer module, a 3-8 decoder group, a relay driving circuit module, a double-pole double-throw relay control circuit module, a positive electrode output terminal and a negative electrode output terminal, and can accurately position a selected battery in the battery pack. The application can conveniently realize the capacity expansion of the selection device by expanding the chip selection decoder circuit, and reduces the use of I/O interfaces of a singlechip. However, the combinational circuit used in this application cannot be well applied to the voice playing technology, and the decoder circuit is complex because it adopts a multi-stage expansion mode to complete bit selection, and needs to use multiple decoders during expansion, which results in high cost.

Disclosure of Invention

1. Technical problem to be solved by the utility model

The utility model aims to solve among the prior art audio frequency quantity that pronunciation broadcast circuit board broadcast is limited, and occupy too much control port's problem, provide a singlechip pronunciation extension control circuit, the utility model discloses can make full use of and extension control port, broadcast more audio frequency.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model discloses a singlechip pronunciation extension control circuit, select extension unit and trigger unit including power supply unit, control unit, position, the position select extension unit include that 3-8 decoder position select submodule piece and 9 lines single control position select submodule pieces, trigger unit includes 8 relay groups and ground control special relay; the power supply unit is electrically connected with each module for supplying power, the singlechip output terminal of the control unit is electrically connected with the 3-8 decoder bit selection module and the 9-wire single control bit selection module, and the control bit selects the output signal of the expansion unit; the output terminals of the 3-8 decoder bit selection module and the 9-wire single-control bit selection module are connected with the input terminals of the 8-path relay group and the ground control special relay, and the corresponding relays are triggered under the control of the single chip microcomputer so as to play corresponding audio.

Furthermore, the 3-8 decoder bit selection sub-module adopts a 74HC238 chip, three input terminals of the chip are connected with an I/O interface of the singlechip, the singlechip carries out binary logic coding through the three interfaces, low-level bit selection signals 1-8 are correspondingly obtained at eight output terminals of the decoder chip, and the bit selection signals are sent to the trigger unit through lead wires of the output terminals.

Furthermore, the 9-wire single-control-position selection sub-module is externally led by nine different I/O interfaces of the single chip microcomputer, wherein eight lead wires are electrically connected with lead wires of eight output ends of the decoder to send out 8 low-level position selection signals, and the 9 th lead wire is directly connected with the trigger unit to send out 1 low-level position selection signal.

Furthermore, the 8-path relay group comprises eight single-pole single-throw relays, low-level trigger signal INPUT terminals INPUT _ K1-INPUT _ K8 of the relays are correspondingly connected with output end leads of the 3-8 decoder bit selection module respectively, and each output normally-open end _ K1-normally-open end _ K8 of the 8-path relay group is correspondingly connected with the voice channel control ports 1-8.

Furthermore, the ground control special relay adopts a single-pole double-throw relay, a low-level trigger signal INPUT terminal INPUT _ K9 of the ground control special relay is correspondingly connected with a 9 th lead wire of a 9-wire single-control position selection submodule, an output public terminal _ K9 of the single-pole double-throw relay is connected with a GND control port, and after being connected together, the output public terminals _ K1-public terminal _ K8 of the 8-path relay group are connected with an output normally-closed terminal _ K9 of the ground control special relay.

Furthermore, in the 8-path relay group, the positive power supply input terminals of each single-pole single-throw relay are connected together to form a terminal connection power supply, and the negative power supply input terminals of each single-pole single-throw relay are connected together to form a terminal grounding; the power supply input terminals of the positive electrode and the negative electrode of the power supply of the single-pole double-throw relay are independently kept.

Furthermore, the single chip microcomputer is provided with a clock circuit which comprises a resonator, a capacitor C1 and a capacitor C2, pins XTAL1 and XTAL2 of the single chip microcomputer are respectively connected with the capacitor C1 and the capacitor C2 and then grounded, and two ends of the resonator are connected with pins XTAL1 and XTAL2 of the single chip microcomputer to provide working excitation pulse signals.

Furthermore, the single chip microcomputer is further provided with a reset circuit which comprises a capacitor C3, a resistor R1, a resistor R2 and a KEY KEY _ RST, wherein the capacitor C3, a power supply VCC, the KEY KEY _ RST and the resistor R2 form a series circuit, and the series circuit is grounded through a resistor R1 and connected to a RST pin of the single chip microcomputer.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with existing well-known technique, have following beneficial effect:

(1) the utility model discloses a singlechip pronunciation extension control circuit, the IO interface of singlechip can produce eight ways control signal through the extension of 3-8 decoders, is less than nine times at required broadcast audio frequency quantity, only needs three IO interface just can realize the broadcast, and the IO interface of singlechip has obtained abundant utilization.

(2) The utility model discloses a singlechip pronunciation extension control circuit, 9 lines single control position select the module respectively with nine IO interface connections of singlechip, 8 way relay groups select the signal connection with eight positions in the module with 9 lines single control position, each way or every several ways correspond different audio frequencies; the special ground control relay temporarily isolates eight bit selection signals of the 8-channel relay group and the 9-wire single-control bit selection module, after the single chip microcomputer selects a circuit to be switched on, the special ground control relay acts again to enable the selected circuit to be switched on simultaneously, corresponding audio is played, 255 audios can be played at most in a free combination mode under the cooperation of the 9-wire single-control bit selection module and the relay, and compared with a traditional voice playing circuit board, the number of the audios capable of being played is increased.

Drawings

Fig. 1 is a system block diagram of a multi-channel speech playing apparatus according to the present invention;

fig. 2 is a circuit diagram of a control unit of the present invention;

fig. 3 is a circuit diagram of a bit selection expansion unit according to the present invention;

fig. 4 is a circuit diagram of the trigger unit of the present invention;

fig. 5 is a schematic diagram of a single-pole single-throw relay of the middle trigger unit of the present invention;

fig. 6 is a schematic diagram of a single-pole double-throw relay of the middle trigger unit of the present invention;

fig. 7 is a plan layout view of the playing unit of the present invention;

fig. 8 is a schematic diagram of a power supply switch and an indication module of the playing unit according to the present invention;

fig. 9 is a schematic diagram of the voice channel triggering module of the playing unit according to the present invention;

fig. 10 is a schematic diagram of an audio file transmission module of the playing unit according to the present invention;

fig. 11 is a schematic diagram of an audio file storage module of the playback unit according to the present invention;

fig. 12 is a schematic diagram of an audio output and adjustment module of the playback unit according to the present invention;

fig. 13 is a circuit diagram of the sound sequence display module of the middle playing unit of the present invention.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

Example 1

The single chip microcomputer voice extension control circuit comprises a control unit, a bit selection extension unit (a 3-8 decoder and a 9-line single-control bit selection module), a trigger unit (a 9-way relay group integrated circuit trigger module) and a movable independent power supply unit which are sequentially connected, wherein the connection relation among the modules is shown in fig. 1.

The single chip microcomputer control unit takes an STC12C5A60S2 type single chip microcomputer as a core main control chip, a minimum system is formed by utilizing a peripheral power supply circuit, a clock circuit, a downloading circuit and a reset circuit, meanwhile, a resistor exclusion pull-up circuit is additionally arranged outside a P0 port of the single chip microcomputer, and the wiring layout is shown in figure 2.

The STC12C5a60S2 type single chip microcomputer has 40 pins, a VCC pin and a GND pin are not shown in fig. 2, and high and low level logic signals are received and transmitted mainly through a P0 port, a P1 port, a P2 port and a P3 port; the power supply circuit comprises a VCC terminal and a GND terminal, and an external power supply supplies power to the singlechip through the two positive and negative pins. The clock circuit comprises a GND terminal, an active quartz crystal resonator with oscillation frequency of 11.0592MHZ, and ceramic chip capacitors C1 and C2 with capacitance value of 10-50 PF and without division of positive and negative terminals, wherein two ends of the active quartz crystal resonator are connected with an XTAL1 pin and an XTAL2 pin of the single chip microcomputer through the two ends of the active quartz crystal resonator, and work excitation pulse signals are provided for the active quartz crystal resonator. The download circuit comprises four parts, namely a VCC terminal, an RXD terminal, a TXD terminal and a GND terminal, wherein the RXD terminal and the TXD terminal are in cross connection with an RXD pin and a TXD pin of the singlechip, and a user can burn and transplant the compiled program codes of the PC end into the singlechip through a USB-to-TTL special downloader. The reset circuit comprises a VCC terminal, a GND terminal, an electrolytic capacitor C3 with a capacitance value of 10UF and a positive and negative terminal, a resistor R1 with a resistance value of 10K, a resistor R2 with a resistance value of 1K and a light-touch non-self-locking independent KEY KEY _ RST, wherein when the single chip microcomputer is powered on or crashed for the first time, the single chip microcomputer can be reset by actuating the light-touch non-self-locking independent KEY KEY _ RST. Because the port P0 is a quasi-bidirectional I/O interface, pull-up resistors R3-R10 with external 8 steric hindrance values of 1K can provide current for the port P0, and therefore external driving capability of the port P0 is enhanced.

Fig. 3 is a circuit diagram of the bit selection extension unit in this embodiment, which is composed of two parts, i.e., a 3-8 decoder bit selection module and a 9-line single-control bit selection module, where the number of audio files is n, n is an integer, when n is less than 9, the 3-8 decoder bit selection module normally operates, and otherwise, when n is greater than 8 and less than 256, the 9-line single-control bit selection module normally operates.

The actual value of the number n of the audio files is determined by engineering technicians according to actual requirements, but the maximum threshold value of n depends on the triggering mode of 8 external voice channel control ports described below.

Any number of 8 voice channel control ports are selected in a combined mode, connected together and then communicated with a GND control port, and therefore playing of a certain audio file can be triggered to the ground. If the total number of the voice channel control ports is p and the number of the randomly selected voice channel control ports is q, the value of p is 8, the value of q can be any integer from 1 to 8, and the sum of the values is expressed by a mathematical combination formula

It can be seen that the maximum number n of audio files is 255.

In the embodiment, a ground triggering mode is adopted, the 3-8 decoder bit selection module takes a 74HC238 type decoder as a main chip, input terminals A, B and C of the 3-8 decoder bit selection module are respectively and correspondingly connected with a P1^0 pin, a P1^1 pin and a P1^2 pin in an I/O interface of a single chip microcomputer, the single chip microcomputer carries out binary logic coding through the 3 terminals, and low-level bit selection signals 1-8 can be correspondingly obtained at Y0-Y7 output ends of the decoder chip so as to be used by a subsequent relay group integrated circuit triggering module.

The 9-wire single-control position selection sub-module leads wires from 9 different I/O interfaces of the single-chip microcomputer to the outside, and the single-chip microcomputer can directly send out 9 independent low-level position selection signals through the I/O interface wires so as to be used by a subsequent relay group integrated circuit triggering module.

The 9-path relay group integrated circuit trigger module uses two different types of relays in common, one type is a single-pole single-throw type relay, and the other type is a single-pole double-throw type relay. Referring to fig. 4-6, the single-pole single-throw relay is a comprehensive circuit trigger module integrating a driving circuit and a control circuit, 5 terminals are reserved outside the single-pole single-throw relay, and respectively include a relay low-level trigger signal input terminal, a power supply positive electrode power supply input terminal, a power supply negative electrode power supply input terminal, a public output terminal and a normally open output terminal, and after the relay is normally powered on, an internal coil is enabled by virtue of an input low-level trigger signal to control the conduction of the public end and the normally open end.

The single-pole double-throw relay is different from the single-pole single-throw relay in that the output of the single-pole double-throw relay is provided with 3 terminals which are respectively a normally closed output terminal, a public output terminal and a normally open output terminal, and under the action of a low level trigger signal, the on state of a public end and a normally closed end under a normal condition can be converted into an off state, namely the public end is conducted with a normally open end.

Fig. 4 is a schematic diagram of a trigger module of the 9-way relay set integrated circuit according to this embodiment. The 9-path relay group integrated circuit trigger module is divided into two parts of an 8-path relay group and a ground control special relay, wherein the 8-path relay group is formed by combining 8 identical single-pole single-throw relays, a power supply positive electrode power supply input terminal and a power supply negative electrode power supply input terminal of each single-pole single-throw relay are connected together, so that only two power supply input terminals VCC _5V and GND need to be led out independently, the ground control special relay uses 1 single-pole double-throw relay, and the power supply positive electrode power supply input terminals and the power supply negative electrode power supply input terminals of the relay are left independently.

The low level trigger signal INPUT terminals INPUT _ K1-INPUT _ K9 of the 9-path relay are respectively and correspondingly connected with the bit selection signal output terminals in the bit selection expansion unit, the output normally-open ends _ K1-normally-open ends _ K8 of the 8-path relay group are respectively and correspondingly connected with the 8 INPUT voice channel control ports of the playing unit, the output common ends _ K1-common ends _ K8 of the 8-path relay group are connected together and then connected with the output normally-closed end _ K9 of the ground control special relay, and the output common end _ K9 of the ground control special relay is connected with the GND control port of the playing unit.

The singlechip voice extension control circuit of the embodiment has the working principle that: the single chip microcomputer control unit, the bit selection extension unit and the trigger unit jointly form a control device for the playing unit, and the control device belongs to an automatic mode of voice playing control. When the number n of the audio files is less than 9, the ground control special relay does not need low level trigger signals, the single chip microcomputer can directly enable an internal coil of a relay in the 8-path relay group to be conducted to an output public end and a normally open end through a 3-8 decoder to form a series circuit, and therefore playing of the audio files is achieved. When the number n of the audio files is more than 8, the single chip sends a low-level trigger signal to the ground control special relay through the P1^3 pin, so that the common end of the single chip is disconnected with the normally closed end and is connected with the normally open end, the temporary isolation of the output common end of the 8-path relay group and the GND control port on the voice playing board is realized, and the purpose is to determine some relays needing to give the trigger signal. After the single chip microcomputer sends a plurality of low level trigger signals to the 8 paths of relay groups through 8 pins of the P2 port, a plurality of voice channel control ports needing to be conducted can be determined, then the single chip microcomputer outputs high level invalid signals through the P1^3 pin, and further the normally closed end and the public end of the special relay are conducted, and therefore playing of a certain audio file is triggered to the ground.

The movable independent power supply module is an LM2596 type DC-DC adjustable buck-boost/voltage-stabilization integrated circuit, an external power supply is connected into the module through a front positive and negative electrode interface, after a potentiometer is adjusted, a certain voltage value can be obtained on the rear positive and negative electrode interface to supply power to each unit, but the positive and negative electrodes of the input power supply cannot be reversely connected, otherwise, the module can be burnt out.

In the singlechip expansion control circuit, the I/O interface of the singlechip is expanded by the 3-8 decoder to generate eight paths of control signals, when the number of required played audios is less than nine, the playing can be realized only by three I/O interfaces, and the I/O interface of the singlechip is fully utilized. The 9-line single-control position selection module is respectively connected with nine I/O interfaces of the single chip microcomputer, the 8-path relay set is connected with eight position selection signals of the 9-line single-control position selection module, and each path or each plurality of paths corresponds to different audios; the special ground control relay temporarily isolates eight bit selection signals of the 8-channel relay group and the 9-wire single-control bit selection module, after the single chip microcomputer selects a circuit to be switched on, the special ground control relay acts again to enable the selected circuit to be switched on simultaneously, corresponding audio is played, 255 audios can be played at most in a free combination mode under the cooperation of the 9-wire single-control bit selection module and the relay, and compared with a traditional voice playing circuit board, the number of the audios capable of being played is increased.

Example 2

The multi-channel voice playing device of this embodiment utilizes the single chip microcomputer extension control circuit described in embodiment 1, and further includes a playing unit (multi-channel voice playing module), and with reference to fig. 7, the multi-channel voice playing module includes a power supply switch and indication module a, a voice channel trigger module b, an audio file transmission module c, an audio file storage module d, a working state indication module e, an audio output and adjustment module f, a sound sequence display module g, an external expansion interface module h, and a plate hole fixing module i.

Referring to fig. 8, the power supply switch and indication module a includes an external power supply positive power supply wiring port a-1, an external power supply negative power supply wiring port a-2, a power supply indicator lamp a-3, an external power supply positive lead-out terminal a-4, an external power supply negative lead-out terminal a-5, an external power supply switch a-6, a power supply indicator lamp a-7, and a current limiting resistor protection circuit a-8.

The external power supply positive electrode power supply wiring port a-1 and the external power supply negative electrode power supply wiring port a-2 are used for being connected with an external power supply; the power supply indicator lamp a-3 uses a red high-brightness LED indicator lamp, the round head diameter of the red high-brightness LED indicator lamp is 5mm, and the red high-brightness LED indicator lamp is used for indicating whether an external power supply is connected to the multi-channel voice playing module or not; the external power supply positive leading-out terminal a-4 and the external power supply negative leading-out terminal a-5 are respectively 9 red pin headers and 9 black pin headers, which are used for leading out the positive and negative poles of the external power supply, and engineering technicians can conveniently measure voltage values and directly use an onboard power supply; the external power supply switch a-6 is used for switching on and off an external power supply and a power supply loop of the multi-channel voice playing module; the power supply indicator lamp a-7 uses a green high-brightness LED indicator lamp, the round head diameter is 5mm, and when the power supply indicator lamp a-3 indicates normally, an external power supply switch a-6 is actuated to indicate whether the external power supply supplies power to the multi-channel voice playing system normally or not; the current limiting resistor protection circuit a-8 provides current limiting protection for the normal operation of the two indicator lamps.

Fig. 9 is a schematic diagram of a voice channel trigger module b in this embodiment, where the module includes a trigger mode switch b-1, a GND pin header b-2, a voice channel pin header b-3, a GND control port b-4, a voice channel control port b-5, a GND control switch b-6, a voice channel dial switch b-7, and a wire b-8.

The conducting wire b-8 is a tin conducting wire, the trigger mode switch b-1, the GND control switch b-6 and the voice channel control switch b-7 are dial switches, the trigger mode switch b-1 is electrically connected with the GND control switch b-6 and used for conducting to the ground, if the trigger mode switch b-1 is not conducted to the ground all the time, any operation in a manual mode is invalid, the voice file cannot be played, and therefore the module can be controlled to switch between an automatic playing mode and a manual playing mode. The GND pin header leading-out terminal b-2 is communicated with the GND control port b-4, two different leading-out modes of GND are reflected, one mode is pin header leading-out, and the other mode is control port wiring leading-out, so that engineering technicians can conveniently trigger the voice channels. b-3 and b-5 are extracted in the same manner as b-2 and b-4. The voice channel control port b-5 and the voice channel control switch b-7 are eight, one end of the voice channel control switch b-7 is correspondingly connected with the voice channel control port b-5, the other end of the voice channel control switch b-7 is connected with the GND control switch b-6 through a wire b-8, when the voice channel control switch is used, the needed voice channel control switch b-7 is firstly opened, the GND control switch b-6 is then opened, the needed voice channel can be simultaneously connected, corresponding audio can be correctly played, more audio can be played through the mode, engineering technicians can conveniently trigger the voice channel, and the practicability is good.

With reference to fig. 10, the audio file transmission module C includes a standard USB interface C-1, an android Micro-USB interface C-2, an android Type-C interface C-3, an apple Lightning interface C-4, and an HC-series bluetooth transparent transmission electronic module C-5, the standard USB interface C-1, the android Micro-USB interface C-2, the android Type-C interface C-3, and the apple Lightning interface C-4 can all be used as an interface for supplying power to the multi-channel voice playing module by an external power source, when these interfaces are inserted into various mobile terminals, the interfaces of the mobile terminals can pop up two function selection areas for power supply and downloading, and an engineer only needs to click to select a corresponding function according to an application requirement in an actual situation. Standard USB interface C-1, tall and erect Micro-USB interface C-2 of ann, tall and erect Type-C interface C-3 of ann and apple Lightning interface C-4, for the download interface of 4 kinds of different grade types that use in the audio file wired transmission mode, because of people's commonly use tall and erect cell-phone of ann and apple cell-phone at present, charging wire joint Type corresponding to it is also basically fixed, design interface like this can ensure that engineering technical staff uses the vast majority of charging wires all can regard as the download line to go to transmit audio file, and the convenience of use improves to some extent. The HC series Bluetooth transparent transmission electronic module c-5 is communication equipment used in an audio file wireless transmission mode, and the trouble of wired audio file transmission can be avoided by using a Bluetooth short-distance wireless transmission network to implement communication. In conclusion, audio files manufactured and completed on various mobile terminals according to certain format rules can be transmitted to a memory on the multi-channel voice playing module in a wired or wireless mode, and the downloading mode is richer.

Referring to fig. 11, the audio file storage module d includes a fixed memory d-1, an SD card slot d-2, a TF card slot d-3, and a usb disk slot d-4, the memories of the multichannel audio playing device are divided into two types, one type is the memory d-1 fixed on the circuit board, the other type is a removable memory including three types, i.e., an SD card, a TF card, and a usb disk, which are respectively connected to the circuit board through the SD card slot d-2, the TF card slot d-3, and the usb disk slot d-4, and at this time, they and the fixed memory d-1 together form the fixed memory, and the audio file can be stored in different positions according to the requirement, and can store and play more audio. In order to save the occupied space of the circuit board, the USB flash disk interface d-4 is shared with the standard USB interface c-1 in the audio file transmission module c, so that the manufacturing cost can be reduced.

In this embodiment, the working state indicating module e is similar to the power supply switch and the power supply indicating lamp a-3, the power supply indicating lamp a-7 and the current-limiting resistor protection circuit a-8 in the indicating module a, and the difference lies in that the color of the used high-brightness LED indicating lamp is blue, the diameter of the round head is 10mm, when the device works normally, the state of downloading the audio file is flash, and the state of playing the audio file is slow flash, so that the device can be distinguished from the normally-on state of the power supply indicating lamp.

In this embodiment, the audio output and adjustment module f includes an active audio output port f-1, a volume adjustment knob f-2 and a passive audio output port f-3. Wherein, the active audio output port f-1 is an earphone seat which can be externally connected with a sound box or an earphone for use; the volume adjusting knob f-2 is a potentiometer for adjusting the volume when playing voice. The passive audio output port f-3 is a wiring port which can be externally connected with a loudspeaker, and the plane layout of the passive audio output port f-3 is shown in fig. 12.

Referring to fig. 13, the tone sequence display module g employs a 1602 type LCD display screen, the display screen has 20 pins, the VEE pin and the RES' pin may not be connected, the VSS pin, the VDD pin, the BL + pin and the BL-pin thereof are power supply terminals, the VSS pin and the BL-pin are both grounded, the VDD pin and the BL + pin are both connected to a 5V power supply, a potentiometer R1 is connected between the VSS pin and the VDD pin, the maximum variable resistance value of the potentiometer R1 is 10K, and the adjustment terminal thereof is connected to the AO pin for adjusting the display definition of characters in the display screen interface; the pins E1, E2 and R/W' of the LCD screen are respectively connected with the pins P1^4, P1^5 and P1^6 of the single chip microcomputer externally for receiving and transmitting read-write control instructions, and the pins D0-D7 are correspondingly connected with the 8 pins of the P0 port of the single chip microcomputer for transmitting a character data instruction to be displayed on the display screen, namely the serial number of the currently played audio file, so that a user can conveniently read the basic information of the currently played audio file, and the readability of the voice playing state is improved.

The external expansion interface module h only has pin headers, and can be externally connected with a light display module and a voice playing module to jointly form an acousto-optic demonstration terminal for serving as an alarm prompt signal.

The plate hole fixing module i is 3 round holes with the diameter of 3mm, and is designed on the whole multi-channel voice playing module in a triangular mode, so that the fixed circuit board can be conveniently installed.

The multichannel voice playing device of the embodiment realizes automatic control by means of the external single chip microcomputer control module, the 3-8 decoder, the 9-line single control position selection module and the 9-channel relay group integrated circuit triggering module, not only effectively improves the utilization rate of an I/O port of the single chip microcomputer, but also utilizes the voice channel control port with limited number to expand and trigger more audio files, and the function is richer. The audio file downloading device is provided with various downloading interfaces, the application range is wide, the audio file can be downloaded in a wired or wireless mode, the file transmission mode is diversified, the used memory types are rich, the storage position of the audio file can be randomly replaced, and the practicability is stronger.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims (8)

1. The utility model provides a singlechip pronunciation extension control circuit, includes the electrical unit, its characterized in that: the system also comprises a control unit, a bit selection expansion unit and a trigger unit, wherein the bit selection expansion unit comprises a 3-8 decoder bit selection sub-module and a 9-line single-control bit selection sub-module, and the trigger unit comprises 8 paths of relay groups and a ground control special relay; the power supply unit is electrically connected with each module for supplying power, the singlechip output terminal of the control unit is electrically connected with the 3-8 decoder bit selection module and the 9-wire single control bit selection module, and the control bit selects the output signal of the expansion unit; the output terminals of the 3-8 decoder bit selection module and the 9-wire single-control bit selection module are connected with the input terminals of the 8-path relay group and the ground control special relay, and the corresponding relays are triggered under the control of the single chip microcomputer so as to play corresponding audio.

2. The single-chip microcomputer voice expansion control circuit according to claim 1, characterized in that: the 3-8 decoder bit selection submodule adopts a 74HC238 chip, three input terminals of the submodule are connected with an I/O interface of a single chip microcomputer, the single chip microcomputer carries out binary logic coding through the three interfaces, low-level bit selection signals 1-8 are correspondingly obtained at eight output terminals of the decoder chip, and the bit selection signals are sent to the trigger unit through lead wires of the output terminals.

3. The single-chip microcomputer voice expansion control circuit according to claim 2, characterized in that: the 9-wire single-control position selection sub-module is externally led by nine different I/O interfaces of the single chip microcomputer, wherein eight lead wires are electrically connected with lead wires of eight output ends of the decoder to send out 8 low-level position selection signals, and the 9 th lead wire is directly connected with the trigger unit to send out 1 low-level position selection signal.

4. The single-chip microcomputer voice expansion control circuit according to claim 3, characterized in that: the 8-path relay group comprises eight single-pole single-throw relays, low-level trigger signal INPUT terminals INPUT _ K1-INPUT _ K8 of the relays are correspondingly connected with output end leads of a 3-8 decoder bit selection module respectively, and each output normally-open end _ K1-normally-open end _ K8 of the 8-path relay group is correspondingly connected with voice channel control ports 1-8.

5. The single-chip microcomputer voice expansion control circuit according to claim 4, characterized in that: the special ground control relay adopts a single-pole double-throw type relay, a low-level trigger signal INPUT terminal INPUT _ K9 of the special ground control relay is correspondingly connected with a 9 th lead of a 9-wire single-control position selection module, an output public terminal _ K9 of the single-pole double-throw type relay is connected with a GND control port, and after being connected together, each output public terminal _ K1-public terminal _ K8 of the 8-path relay group are connected with an output normally-closed terminal _ K9 of the special ground control relay.

6. The single-chip microcomputer voice expansion control circuit according to claim 5, characterized in that: in the 8-path relay group, the positive power supply input terminals of each single-pole single-throw relay are connected together to form a common terminal and then connected with a power supply, and the negative power supply input terminals of each single-pole single-throw relay are connected together to form a common terminal and then grounded; the power supply input terminals of the positive electrode and the negative electrode of the power supply of the single-pole double-throw relay are independently kept.

7. The single-chip microcomputer voice expansion control circuit according to any one of claims 1 to 6, characterized in that: the single chip microcomputer is provided with a clock circuit which comprises a resonator, a capacitor C1 and a capacitor C2, pins XTAL1 and XTAL2 of the single chip microcomputer are respectively connected with the capacitor C1 and the capacitor C2 and then grounded, and two ends of the resonator are also connected with pins XTAL1 and XTAL2 of the single chip microcomputer to provide working excitation pulse signals.

8. The single-chip microcomputer voice expansion control circuit according to claim 7, characterized in that: the single chip microcomputer is further provided with a reset circuit which comprises a capacitor C3, a resistor R1, a resistor R2 and a KEY KEY _ RST, wherein the capacitor C3, a power supply VCC, the KEY KEY _ RST and the resistor R2 form a series circuit, and the series circuit is grounded through a resistor R1 and connected to an RST pin of the single chip microcomputer.

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