Single-chip voice storage and playback of the study
Abstract
Sunplus SPCE061A subject to the single-chip microcomputer as the main body, a digital voice storage and playback, the whole system is divided into audio, stop, and playing three states, with key changes in the state of control S1S2S3. Memory used W29C040, audio power amplifier using SPY0030, the use of single-chip built-in SPCE061A input LineIN, good performance of the digital filters least squares audio signal (300 ~ 3400) outside the signal band, the audio signal AD conversion will be converted to electrical signals, using the SACM-A2000 compression algorithm to compress data stored in memory W29C040. Playback when the W29C040 to read data from the use of libraries provided by SACM Sunplus DVR playback function, digital-to-analog conversion drive through speakers to enlarge. At 8kHz sampling frequency, voice storage time of 4 minutes, when the voice playback distortion small, good sound quality. The combination of hardware and software so that the system has a reasonable structure, the basic performance indicators to meet the requirement.
Key words: SPCE061A; W29C040; Voice Recorder
