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參數(shù)資料
| 型號(hào)： | PSB7280 |
| 廠商： | SIEMENS A G |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Joint Audio Decoder-Encoder |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 文件頁(yè)數(shù)： | 157/190頁(yè) |
| 文件大?。?/td> | 2177K |
| 代理商： | PSB7280 |
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PSB 7280
Semiconductor Group
157
Data Sheet 1998-07-01
6.2.2
The uncompressed data protocol is quite simple. The default configuration is 8-kHz
sampling rate and 16-bit linear data. The sampling rate can be switched between 8-kHz
and 16 kHz (see S-bit in the control block) and the data format can be selected to be
either 16-bit linear or 8-bit PCM (G.711 A-/
μ
-law). For a 10 ms framing the size of the
uncompressed data (in bytes) is listed in the table below:
Uncompressed Data Protocol
Note: Independently of the interface selection for the uncompressed audio, always the
most significant bit of the most significant byte is transferred first, e.g. 16-bit linear
samples are split up into two bytes and the most significant bit of the most
significant byte is transferred first (big endian).
6.2.3
In this chapter the timings and/or interrupt handshake procedures are described for the
different hardware interface selections (Host/Host, IOM/Host, IOM/Serial Audio
Interface).
After a hardware reset the firmware automatically does all necessary initializations for
the IOM/Serial Audio Interface combination described in
Chapter 6.2.3.3
. The other
interface combinations can be configured by configuring the control block (see
Chapter 6.2.1.1
).
Note: After a hardware reset, the JADE firmware needs to initialize its internal memories
and interfaces. The time to do this is less than 10 ms. The user must take care to
access the JADE only after this initialization phase is completed, i.e. 10 ms after
the hardware reset.
Audio Interface Timings
6.2.3.1
Uncompressed Data:
Compressed Data:
This interface combination is used for offline processing of audio (ISEL(1-0) = 00).
I.e. the compression can be done faster than realtime, because the JADE is in each
mode able to process audio at least in realtime. This definitely also depends on the
capabilities of the host processor to provide a fast interrupt service to the handshake
procedure described below. The most complex algorithm is G.728, in this mode the
maximum possible speed is only slightly faster than realtime, because almost all of the
computational power of the JADE is needed to compress the audio.
Host IF
Host IF
16-bit linear
160
320
G.711 A-/
μ
-law
80
160
8-kHz sampling rate
16-kHz sampling rate
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