參數(shù)資料
型號(hào): STV0684
廠商: 意法半導(dǎo)體
英文描述: Digital Camera Processor
中文描述: 數(shù)碼相機(jī)處理器
文件頁(yè)數(shù): 19/49頁(yè)
文件大小: 487K
代理商: STV0684
19/49
STV0684
Functional Description
3.6
Audio interface
The STV0684 includes every step of the processing chain required to record, compress,
decompress and playback audio. The STV0684 features a high quality 16 bit sigma delta analog to
digital converter including automatic level control and noise gating, as well as volume control. It also
features an ADPCM CODEC to maximize the length of audio and AVI clips on a given mass storage
media. Finally, the product features a digital to analog converter (PWM followed by RC filters) to
directly address a speaker or buzzer for audio playback.
3.6.1
Audio record
The audio record block consists two main blocks the analogue front end and a 16bit delta-sigma
ADC. The front end includes the functions of automatic level control and noise gate, and volume
control, the ADC uses sampling frequencies of 8kHz, 11.025kHz, 16kHz, 22.05kHz, 32kHz,
44.1kHz and 48kHz, with either differential or single ended inputs. The sampled output can be 8 or
16 bit. The output of the ACD is then available to the ADPCM module giving an audio compression
ratio of 4 to 1.
3.6.2
Audio playback
Audio playback is achieved by an internal Pulse Width Modulator with a sample rates of 8kHz,
11.025kHz, 16kHz, 22.05kHz, 32kHz or 44.1kHz, connected to either an external amplifier chip and
loudspeaker/ head phone socket, or to a simple piezo buzzer.
3.7
TV interface
The TV block is composed of a digital encoder that supports PAL and NTSC and a video digital to
analog converter (DAC). This interface supports still and video encoding for display on a TV set.
Features
Supports PAL/NTSC analog TV standards
Interlaced input data, YCrCb 4:2:2 format
16bits x 16words FIFO for buffering incoming display data
Interrupt generation
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