Music Synthesizer Based On FPGA

Modern electronic design is the core of EDA (Electronic Design Automation) technology. EDA technology relies on powerful computer systems, EDA software tools in the platform, using the bottom-up design,and Hardware Description Language HDL description for the system logic to complete the primary means of system design. Programmable logic device (FPGA / CPLD) can be easily digital system design, and in Altera's QuartusII software platform, FPGA design stages have been well supported, making the effective integration of the two digital systems design faster and more convenient. Compiled using the QuartusⅡsoftware and simulation, as high-density FPGA, programmable and have a strong EDA software support, etc., so the design features strong, flexible and high reliability, has some practical value.Based on FPGA, the way to full hardware design of a digital music chip. The scope of the sound spectrum generally between tens to thousands of hertz, for example: To program control of the FPGA chips use a pin to the output of a frequency square wave, then the speaker can be connected to this issue of the appropriate frequency tones. The music of each note correspond with different frequencies, so you want to send notes of different pitch, as long as the control output corresponding note frequency on it. Music notes from a series of coherent form, so the order by music note output corresponding to the frequency of these notes can be reached through the speakers of various notes issued by a continuous tone purposes. Play out exactly the same time a piece of music, just send the appropriate temperament is totally inadequate, should also accurately reflect the rhythm of music, that the duration of each note, which is time value. Programming is the key to accurately and music in the notes issued in accordance with certain provisions of the frequency, and according to the needs of music by the beat notes of control, this is music to play two important factors. FPGA chips in this article as the main musical synthesis system control chip SOC,18 dip switches were used as demo sound and key borad input switch,the different tone and dual tone controls,and push-button is used to play demo sound. Key Borad of keyboard input from the VGA output displayed on the computer screen, which represents the electronic keyboard to play music when pressed. Finally by the WM8731's Line Out the speaker generate sound.As a result of advanced EDA technology, makes the system integration that has high reliability and stability of the same time, it reflects more than the traditional design method of design flexibility and higher effectiveness. Extensions on the system has great potential, there are good prospects and research value. The design will be a core part of the music synthesizer integrated in the programmable logic device on the FPGA chip, greatly simplifying the external circuit, compared with previous conventional designs, which reduces the number and type of chip used, but also bring down power consumption reduce the volume, enhance the role of overall system performance, the system in use failure rates were significantly reduced. In addition, programmable logic devices based on the hardware description language Verilog HDL design, in this design at all stages of all levels to carry out computer simulation validation, to ensure the validity of the design process, can effectively reduce the design cost, shortening design cycle, and has broad application prospects.