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(huà)的DSP)
中文描述： DSP的數(shù)字應(yīng)答電話(huà)（用于數(shù)字應(yīng)答電話(huà)的數(shù)字信號(hào)處理器）
文件頁(yè)數(shù)： 17/30頁(yè)
文件大小： 147K
代理商： KS16121
Preliminary
DSP for Digital Answering phone with FLASH interface
KS16121
TABLE 3. Performance of Call Progress Tone Detector
TONE GENERATION
The KS16121 has a programmable tone generator that outputs a single or dual frequency tone, intended for
signalling and other purposes. The total number of tones that can be defined and used is 31.
An internal tone table holds the frequencies and gains of each tones.
The host can instruct the KS16121 to generate a tone signal from an idle or record mode.
The KS16121 accepts the 5-bit tone index and 4-bit gain from the instruction. The gain is given in 2-dB setps.
During a system reset, the KS16121 sets the tone frequencies and gains to their default values. The first twelve
tones, indices 0 x 1 through 0 x c, are standard DTMF tones, specified in Table 1. The tone with index 0 x 10 is
a standard DTMF
D
tone, which will be used as an acknowledgement signal during off-hook transmission of
Calling Number Delivery function . The host is free to change the frequencies and gains of any tone to meet
the need of a specific application.
SPEAKER - PHONE
The KS16121 performs a speakerphone with the following features:
- Acoustic echo canceller (
AEC
) to cancel acoustic echo
- Line echo canceller (
LEC
) to cancel near-end echo
- Full-duplex mode under the double-talk condition
- Speaker output volume, line output volume, line input sensitivity, and microphone input sensitivity
controlled by user command
- Tone detector to detect ring signal to reduce the effects of dial tone, ringing signal and busy tone
- Another tone detector to detect the CPE alerting signal
Parameter
MIN.
MAX.
UNIT
Detector frequency
On/Off Duration
Signal level ( detection )
Signal level ( rejection )
Noise Tonerance ( SNR )
330
260
-30
12
640
-35
Hz
msec
dBm
dBm
dB
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