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參數(shù)資料
| 型號(hào)： | PSB7238 |
| 廠商： | SIEMENS A G |
| 元件分類： | 編解碼器 |
| 英文描述： | Joint Audio Decoder-Encoder - Multimode |
| 中文描述： | A/MU-LAW, PCM CODEC, PQFP100 |
| 文件頁(yè)數(shù)： | 18/190頁(yè) |
| 文件大?。?/td> | 2255K |
| 代理商： | PSB7238 |
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PSB 7238
Introduction
Semiconductor Group
18
Data Sheet 1998-07-01
1.7
System Integration
Example of integration in ISDN/analog videophone:
The first example represents a low-cost solution for a desk-top standalone videophone
that connects to an ISDN S0 bus (ISDN basic access) or an analog telephone line.
The ISDN basic access consists of two 64 Kbit/s so-called B-channels to carry user
information (voice, data,
…
), and a separate 16 Kbit/s D-channel primarily used for
signaling. The video and audio are both compressed so that they are carried, along with
additional control information, in the two B-channels, or 128 Kbit/s.
The analog telephone line can carry up to 33.6 Kbit/s using a V.34+ modem.
The general aspects of videotelephony are covered by ITU-T H.320/H.324
recommendations. The video is compressed according to the H.261 (sometimes called
“p
×
64”) or the H.263 recommendation.
For the ISDN videophone (H.320) the compressed video and audio signals are
multiplexed together with additional synchronization and control information into two
B-channels, which are separately switched via the network and thus have to be
resynchronized at the other end. The multiplexing and resynchronization of the
B-channels is specified by the H.221 recommendation (see
Figure 4
).
For the analog videophone (H.324) the compressed video and audio signals are
multiplexed together with additional control information into a single communication link.
The multiplexing is specified by the H.223 recommendation (see
Figure 4
).
Figure 4
Using non-parametric compression techniques, audio can be compressed to 64 Kbit/s
PCM (logarithmical A- or
μ
-law approximation for 3.1-kHz voice acc. to G.711) or
48/56/64 Kbit/s sub-band coded adaptive PCM (for 7-kHz audio acc. to G.722). This
leaves, however, only approximately 64 Kbit/s for video on the ISDN which, at this rate,
yields only a marginally good picture quality. For the analog videophone it’s not even
possible to transfer only audio at this data rate.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PSB7280 | Joint Audio Decoder-Encoder |
| PSB8510-1P | Programmable Dialing Circuit |
| PSB8510-1T | Programmable Dialing Circuit |
| PSB8510-6P | Programmable Dialing Circuit |
| PSB8510-6T | Programmable Dialing Circuit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PSB7238FV2.1JADEMM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| PSB7280 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Joint Audio Decoder-Encoder |
| PSB7280FV3.1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| PSB7280FV3.1D | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| PSB7300AGDW | 制造商:Infineon Technologies AG 功能描述: |
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