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參數(shù)資料
| 型號(hào)： | MSM7602 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Echo Canceler |
| 中文描述： | 回聲消除器 |
| 文件頁數(shù)： | 26/29頁 |
| 文件大?。?/td> | 238K |
| 代理商： | MSM7602 |
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Semiconductor
MSM7602
26/29
APPENDIX Differences Between the MSM7602 and the MSM7520/7620
Introduction
The MSM7602 is the improved version of the MSM7520 with improved usage. Thus, there are no
differences in echo canceling characteristics.
Enhancements
A new clock frequency of 19.2 MHz.
The basic clock frequency of the MSM7520/7620 was 18 or 38 MHz, while the basic clock
frequency of MSM7602 is 19.2 MHz. (MSM7602 can be applied at a frequency of 18 MHz.
However, external SYNC and SCK are required because the periods of SYNCO and SCKO are
varied.)
Adoption of full-fledged 8-bit data through-mode
In the through-mode for the MSM7520 (HCL pin: "H"), an internally processed PCM signal was
used. Therefore, only the negative minimum value (7F
HEX
) was converted into the corresponding
positive minimum value (FF
HEX
).
Analog to analog conversion causes no problem since both values are the minimum ones, but
data transfer in the through-mode encounters problems. Hence, in the MSM7620/7602, the
complete data trough-mode has been implemented.
Control of input timing to control pins (NLP, HCL, ADP, ATT and GC)
In MSM7520, asynchronous changes in a control pin may result in malfunctioning. This
problem stems from the fact that information on control pins is checked several times during
the execution of a program over one cycle and the state of a control pin is changed between the
first and second half periods.
The MSM7620/7602 provides an internal circuit for using an INT signal to hold control pin
information for one cycle. Thus, external timing control is not needed.
The howling detector control pin (HD) is added.
The MSM7602 can prevent the false detection of the howling detecter cause by tone signals by
providing the howling detecter control pins.
Introduction of 256 kHz internal clock output (SCKO) for PCM transmission
Internal sync signals (SYNCO and SCKO) in MSM7520/7620 are rated at 8 kHz and 200 kHz,
respectively. At a frequency of 8 kHz, PCM multiplexing can be applied to no more than three
channels.
In the MSM7602, SCKO is rated at 256 kHz, while SYNCO at 8 kHz. Thus, PCM multiplexing
can be applied with up to four channels.
Addition of basic clock output
The use of a crystal oscillator for a clock in the MSM7520/7620 requires an oscillating circuit
installed in each of two or more cascade-connected IC chips.
Since the MSM7602 supports basic clock output, only one IC chip requires an oscillating circuit.
(The MSM7602-001TS-K does not provide the basic clock output.)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MSM7602-001 | Echo Canceler |
| MSM7602-011 | Echo Canceler |
| MSM7603 | Echo Canceler |
| MSM7603B | Echo Canceler |
| MSM7630 | Universal Speech Processor(通用語音處理器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MSM7602-001 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Echo Canceler |
| MSM7602-001GS-K | 制造商:ROHM Semiconductor 功能描述: |
| MSM7602-011 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Echo Canceler |
| MSM7603 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Echo Canceler |
| MSM7603B | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Echo Canceler |
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