第1个回答 2010-05-25
In recent years, rapid development of the voice signal processing technology has been in the voice information processing, transmission and storage and so widely used. As the memory cards such as the increasing popularity of portable storage devices, use of SD card storage for voice signals to become a trend. Meanwhile, the use of low-power single chip voice signal processing has become a hot topic in the design and implementation of a speech acquisition system. The system for voice signal processing and real-time implementation of a common platform. Meanwhile, the existing sound card and other devices with audio capture feature, this system has a simple structure, high efficiency, energy saving and easy to carry and so on, and therefore can be used as a portable device or handheld terminal part of the further development and application. In this paper, MSP430F1611 ultra-low power 16-bit microprocessor controlled data acquisition SD card storage, while the single chip contains A / D, D / A, so no external A / D, D / A module. The system implements voice and data sampling, storage and playback capabilities. System through the microphone input voice data, after filtering circuit, AD620 amplifier combined with external devices into the MCU's A / D converter will convert analog signals into digital signals, control signals from the microcontroller is stored in SD card. Playback when needed, and then extracted from the SCM SD card in the voice data, through the SCM D / A converters convert digital signals to analog signals, combined with external circuits through the LM386 power amplifier will playback out of the restored speech signal. At the same time with the system because external buttons, you can reach the system playback control. Also, because voice input circuit and amplifier circuits are modular voice circuit, so the system very versatile and can be used in the use of SD card to store information on SCM issues in software design, the system is programmed using C language , to voice capture and playback purposes.
第2个回答 2010-05-26
In recent years, the rapid development of the speech signal processing technology has in speech information processing, transfer and storage etc. Extensively. Due to the storage CARDS popularization of mobile storage equipment, use of speech signal SD card to the storage become a trend. At the same time, using low consumption of speech signal processing chip has become the hotspot in design and implement a phonic acquisition system. The speech signal processing system for the study and implementation of real-time a common platform. At the same time, with the sound of speech sampling function is compared, this system has the equipment of simple structure, high efficiency, energy-saving and easy to carry, etc. So can also act as a portable device or hand-held terminals of further development and application of. Using the 16-bit single chip MSP430F1611 ultra-low power control of data acquisition and storage SD card, meanwhile, the microcontroller contains A/D, D/A, so there is no need to plus A/D, D/A module. This system realizes the speech data sampling, storage and playback function. System through the mic input speech data, filter circuit, the combination of peripheral devices AD620 amplifier circuit chip and enter the A/D converter analog signal after converting digital signal by single-chip microcomputer control signal, and stored in SD card. In replay, again by to extract the single-chip microcomputer control SD card by MCU, speech data D/A switch to digital signals into analog signals, LM386 through combining the power amplifier circuit of periphery of speech signal will play out after reduction. And because the keys plus cooperation system, can achieve the recording of system control. At the same time, because of speech input circuit and voice amplifier circuit module circuit is very strong, so the system can be used in all kinds of generality, using single-chip microcomputer control SD card store information, in the software design, system using C language program, for purpose of acquisition and playback speech.
第3个回答 2010-05-25
In recent years, high-speed signal processing development of the voice of information processing and transmission and storage has been widely used. the storage cards for the growing popularity of mobile devices with sd card to the voice of the store to become a trend. meanwhile, the use of the low 功耗 monolithic integrated circuits to the voice of the signal for processing has already become a hot, and in the design and implement a system for collecting. the system of phonetic signal processing of research and real-time to provide a common platform
第4个回答 2010-05-26
今天把修改了的翻译发给你了，您看行不行！本回答被提问者采纳