參數(shù)資料
型號(hào)： KS16121
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： DSP for Digital Answering Phone(用于數(shù)字應(yīng)答電話的DSP)
中文描述： DSP的數(shù)字應(yīng)答電話（用于數(shù)字應(yīng)答電話的數(shù)字信號(hào)處理器）
文件頁(yè)數(shù)： 18/30頁(yè)
文件大?。?/td> 147K
代理商： KS16121
Preliminary
DSP for Digital Answering phone with FLASH interface
KS16121
MEMORY/MESSAGE MANAGEMENT
The KS16121 supports a flexible memory management, from the host, of the messages and other information
stored in the memory.
The memory space (Flash memory and ROM/EPROM) and stored information can be manipulated by the host
with the following features :
Message Deletion
--
A message is removed from the memory.
The indices of the remaining messages are updated appropriately to reflect the deletion.
CALLER ID RECEPTION
The KS16121 performs the reception of Caller-ID in accordance with Bell 202 or ITU -T V.23 standards. It can receive
the Caller - ID information during on - hook state with the use of an external ringing signal detector. It can also
receive the information during off - hook state by using the internal CPE alerting signal detector and tone generator.
The input dynamic range of receiver is from -35 to 0 dBm.
The receiver removes redundant information like the Channel Seizure Signal , Mark signal , and any inter - word
delays including start and stop bits from the incoming signal. It provides the host with ASCII bytes forming a
message and Checksum Word. The host can acquire the status of receiver in addition to the received ASCII
bytes by issuing a command to the KS16121 and reading the corresponding status word.
Please refer to the Appendix A for details on the Caller - ID reception and its applications.
CPE ALERTING SIGNAL DETECTION
The KS16121 employs a tone detector to detect the CPE alerting signal which leads the Caller - ID
information during off - hook transmission. This feature of KS16121 is useful in identifying the third caller for
telephone subscribers with the call - waiting option. This detector is active in either Tone Detection or
Speakerphone mode.
The detector consists of two bandpass filters whose center frequencies are tuned to 2130 Hz and 2750 Hz
respectively, and its performance is summarized in the following table.
TABLE 4. CPE Alerting Signal Detction Performance
Parameter
MAX.
MIN.
UNIT
CPE Twist(high/low)
Detection bandwidth
Noise tolerance(SNR)
Tone duration
Detection signal level
12
65
-30
+8/-8
3
dB
%
dB
ms
dBm
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