CN205406081U - Digital control electron tone system - Google Patents

Abstract

The utility model discloses a digital control electron tone system, including singlechip, broadcast module, keyboard and piece external memory, the singlechip includes a plurality of inputoutput interface, the broadcast module is connected on an inputoutput interface, each button of keyboard corresponds respectively to be connected on an inputoutput interface, is used for controlling singlechip work, the piece external memory with the singlechip is connected for the scale information of storage melody, the singlechip is according to the follow corresponding frequency signal is exported extremely to the different scales that acquire among the piece external memory the broadcast module.

Description

A Digitally Controlled Electronic Tone System

technical field

The utility model relates to an electronic tone system, in particular to a player made of a single-chip microcomputer, which belongs to the field of electronic acoustic instruments.

Background technique

The earliest electronic music was an electronic synthesizer invented by an American scientist in the 1960s. After that, China and many other countries gradually carried out the research and development of electronic music. It can be said that the research of electronic music is the key point of progress in the field of modern music information technology. Electronic music players currently on the market generally have high prices and complex circuits, making it unaffordable for consumers.

Utility model content

Aiming at the problems mentioned above in the prior art, the purpose of this utility model is to provide a digitally controlled electronic tone system with simple structure and low cost.

In order to achieve the above object, the utility model adopts the following technical solutions:

A digitally controlled electronic tone system, comprising a single-chip microcomputer, a playback module, a keyboard and an off-chip memory, the single-chip microcomputer includes several input and output interfaces, the playback module is connected to an input and output interface, and each key of the keyboard corresponds to Connected to an input and output interface to control the operation of the single-chip microcomputer, the off-chip memory is connected to the single-chip microcomputer to store the scale information of the music, and the single-chip microcomputer is based on the difference obtained from the off-chip memory. The scale outputs the corresponding frequency signal to the playing module.

As an implementation manner, the playback module includes a signal amplifier and a speaker, and the frequency signal output by the single-chip microcomputer is amplified by the signal amplifier and then input to the speaker.

As an implementation, the keyboard includes several switches and extended input ports, the switches are connected to the single-chip microcomputer through the extended input ports, and the extended input ports convert the opening and closing states of the switches into binary numbers to the microcontroller.

As an implementation manner, the digitally controlled electronic tone system further includes a reset circuit, and the reset circuit is connected to the RST pin of the single-chip microcomputer.

As an implementation manner, the digitally controlled electronic tone system further includes a clock circuit, and the clock circuit is connected to the XTAL pin of the single-chip microcomputer.

Compared with the prior art, the beneficial technical effect of the utility model lies in:

The digital control electronic tone system provided by the utility model uses a single-chip computer to make an electronic music player with simple structure, low cost, good playing effect, small volume, easy to carry, and easy to expand other functions.

Description of drawings

Fig. 1 is a partial circuit diagram of a kind of digital control electronic tone system provided by the utility model;

Fig. 2 is the circuit diagram of the keyboard described in the utility model;

Fig. 3 is the circuit diagram of the playing module described in the utility model;

The symbols in the figure are as follows: 1-single-chip microcomputer; 2-player module; 201-signal amplifier; 202-speaker; 3-keyboard; 301-switch; 302-extended input port; 4-reset circuit; 5-clock circuit.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

As shown in Figures 1 and 2, the digitally controlled electronic tone system provided by this embodiment includes a single-chip microcomputer 1, a playback module 2, a keyboard 3, an off-chip memory (not shown), a reset circuit 4 and a clock circuit 5.

As shown in Figure 1, the single-chip microcomputer 1 includes 8 input and output interfaces (P1.0-P1.7), the playback mode, 2 is connected to the input and output interface P1. .7) be connected with the keyboard 3 of Fig. 2. The reset circuit 4 is connected to the RST pin of the single-chip microcomputer 1 , and the clock circuit 5 is connected to the XTAL pin of the single-chip microcomputer 1 .

As shown in Figure 2, the keyboard 3 includes a switch 301 (a total of 8 bits, SW1-SW8) and an expansion input port 302, and the switch 301 is respectively connected to the input and output interfaces (P1.1-P1.7) of the single-chip microcomputer 1 through the expansion input port 302 connected, the expansion input port converts the on-off state of the 8-bit switch 301 into an 8-bit binary number and sends it to the single-chip microcomputer 1. For example, the initial state of the 8-bit switch 301 is 11111111, which means none of the switches 301 is turned on. When the first switch 301 is turned on, it is 11111110, when the second switch 301 is turned on, it is 11111101, and so on to 01111111, which are used to control the microcontroller to achieve corresponding functions, such as song selection, play, pause, etc. .

The RST pin of MCU 1 is connected to the reset circuit 4. Its main function is that MCU 1 will perform a reset operation every time MCU 1 is powered off, so that the program and result of the last operation will not overlap with the next time. . When the EA pin of MCU 1 is connected to high level, MCU 1 will directly read the scale information of the music from the off-chip program memory, and if EA is connected to low level, then it will read the music scale information from the internal program memory of MCU 1. The program starts to execute, and converts the scale information of the read music into the corresponding frequency signal. The XTAL pin of the microcontroller 1 is connected to the clock circuit 5 for a clock signal. The clock circuit 5 includes three capacitors of 22 μF, 30 μF and 30 μF respectively, and a crystal oscillator of 12MHZ.

As shown in FIG. 3 , the playback module 2 includes a signal amplifier 201 and a speaker 202 . The frequency signal output by the single chip microcomputer 1 is amplified by the signal amplifier 201 and then input to the speaker 202 for playback.

The working principle of the single-chip microcomputer 1 is to use its timer and counter to generate waves of a certain frequency, and then drive the speaker to emit corresponding notes. To generate such a sound frequency, the frequency of the note must first be converted into a corresponding value, so as to drive the speaker to make a sound and combine it into a song. In the present embodiment, the corresponding table of the scale and the frequency used is as follows (the present embodiment is only an example to illustrate this, so that the skilled person understands, but is not limited thereto):

Table 1 Corresponding frequency of each scale (basic and high 8 degrees)

Table 2 Corresponding frequency of each scale (higher 15 degrees)

In addition to this, the highest sound is used, which is 22 degrees higher than 1, and the frequency is 2093.00Hz. Many of the frequencies are decimals. For the convenience of calculation later, all are rounded and converted to integer values. The P1.0 port is used as the output signal port of the single-chip microcomputer 1, connected to the signal receiving port SD of the playback module 2, through the resistor R40, and then the signal is amplified by the signal amplifier 201 (transistor 9012), and transmitted to the speaker 202 (8 ohm speaker socket ), powered by VCC to produce sound.

Finally, it is necessary to point out that: the above is only a preferred specific embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any person familiar with the technical field shall disclose Within the technical scope, easily conceivable changes or replacements shall be covered by the protection scope of the present utility model.

Claims (5)

1. a digital control electronics tone system, it is characterized in that: include single-chip microcomputer, playing module, keyboard and chip external memory, described single-chip microcomputer includes some input/output interfaces, described playing module is connected on an input/output interface, each button of described keyboard is connected respectively on an input/output interface, in order to control the work of described single-chip microcomputer, described chip external memory is connected with described single-chip microcomputer, in order to store the scale information of melody, described single-chip microcomputer is according to frequency signal corresponding to the different scales output obtained from described chip external memory to described playing module.

2. digital control electronics tone system according to claim 1, it is characterized in that: described playing module includes signal amplifier and speaker, the frequency signal of described single-chip microcomputer output inputs to described speaker after the processing and amplifying of described signal amplifier.

3. digital control electronics tone system according to claim 1, it is characterized in that: described keyboard includes some switches and extension input port, described switch is connected with described single-chip microcomputer by described extension input port, and the folding condition of described switch is converted to binary number extremely described single-chip microcomputer by described extension input port.

4. digital control electronics tone system according to claim 1, it is characterised in that: described digital control electronics tone system also includes reset circuit, and described reset circuit is connected to the RST pin of described single-chip microcomputer.

5. digital control electronics tone system according to claim 1, it is characterised in that: described digital control electronics tone system also includes clock circuit, and described clock circuit is connected to the XTAL pin of described single-chip microcomputer.