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參數(shù)資料
| 型號： | UPD61052GD-LML |
| 廠商： | NEC Corp. |
| 英文描述： | MOS INTEGRATED CIRCUIT MPEG2 AUDIO/VIDEO ENCODER |
| 中文描述： | 馬鞍山集成電路MPEG2音頻/視頻編碼器 |
| 文件頁數(shù)： | 19/106頁 |
| 文件大?。?/td> | 824K |
| 代理商： | UPD61052GD-LML |
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Data Sheet S15082EJ4V0DS
19
μ
PD61051, 61052
2.2
Audio
This LSI encodes the MPEG audio encoding and transcode with the internal DSP.
2.2.1
Encoding
It encodes MPEG1 audio layer 2 or Dolby Digital Consumer Encoder (only the
μ
PD61052). In addition, it is
possible to bypass internal audio encode DSP, when the audio elementary stream is encoded by an external audio
encoder are inputted.
2.2.2
Transcoding (DEMUX, MUX)
It is possible to multiplex two de-multiplexed audio streams. It analyzes MPEG1 audio stream, and extracts the
information to multiplex and notify to the host CPU.
2.2.3
Input/output processing
Two PCM audio signals can be inputted to the audio input interface and the audio input-output interface. When
inputting two audio signals, an audio signal is encoded, and another one bypasses the audio encoding DSP, and
transfers to the multiplexer. When inputting an audio elementary stream that has been encoded by the external audio
encoder and PCM audio, it can multiplex two audio elementary streams.
The PCM audio or the audio elementary stream can be outputted from the audio input-output interface. The audio
clock (AMCLK) types the clock by which a phase was locked up STC clock (STCLK).
Table 2-4. Audio Input/output
Item
Input/output format
Data length
16 bits, 20 bits, 24 bits
Sampling frequency
32 kHz, 44.1 kHz, 48 kHz
Justification of transfer
MSB first
I
2
S Compatible/Left justified/Right justified
Format
PCM Audio, IEC60958 based
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