參數(shù)資料
型號(hào)： TL7231MD
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： FULL LAYER-III ISO/IEC 11172-3 AUDIO DECODER
中文描述： 完整的Layer -Ⅲ的ISO / IEC 11172-3音頻譯碼器
文件頁數(shù)： 29/37頁
文件大?。?/td> 468K
代理商： TL7231MD
TL7231MD
SAMSUNG Electronics CO.
29/37
Voice Record/Playback Function
TL7231MD records voice data from ADC in 8kHz sampling rate. There are three compression
modes according to bit rates of compressed data: high quality (32Kbps), medium quality
(24Kbps) and low quality (16Kbps). In high quality mode, relatively large bits are allocated for
compressed data to achieve high quality of the sound. In low quality mode, smaller bits are
allocated to record much more samples in the same size of storage media. Medium quality
mode gives tradeoff between high and low quality modes. Compressed codes are byte-aligned
and transmitted to host MCU through the serial port.
In playback the codes are uncompressed to PCM samples, with the compression mode in
recording, and then oversampled to 32 kHz and output to DAC. Compressed codes are
transmitted from host MCU through the serial interface.
Table 9 is the summary of the relation between compression modes and code size.
Table 9.
Summary of Three Voice Compression Modes
COMPRESSION MODES
CODE LENGTH
(BIT)
High Quality
(32Kbps)
4
Medium Quality (24Kbps)
3
Low Quality
(16Kbps)
2
RECORDING TIME
FOR 32MB STORAGE MEDIA
140 min.
186 min.
280 min.
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