Echo Canceler

The MSM7620 is an improved version of the MSM7520 with the same basic configuration. The MSM7620 includes following improvements: a modified through mode, Timing control of the control pin input, and a thinner package. The MSM7620 also provides a pin-for-pin replacement with the MSM7520. The MSM7620 is a low-power CMOS IC device for canceling echo (in an acoustic system or telephone line) generated in a speech path. Echo is canceled (in digital signal processing) by estimating the echo path and generating a pseudo-echo signal. Used as an acoustic echo canceler, the MSM7620 cancels the acoustic echo between the loud speaker and the Microphone which occurs during hands free Communication such as on a car phone or a conference system phone. Used as a line echo canceler, the device cancels the line echo impedance mismatching in a hybrid. In addition, a quality conversation is made possible by controlling the level and preventing howling with a howling detector, double talk detector, attenuation function and a gain control function, and by controlling the low level noise with a center clipping function. The MSM7620 I/O Interface supports m-law PCM. The use of a single chip CODEC, such as the MSM7543 allows the configuration an economic and efficient echo canceler to be configured. By Oki Semiconductor
MSM7620 's PackagesMSM7620 's pdf datasheet

MSM7620 Pinout, Pinouts
MSM7620 pinout,Pin out
This is one package pinout of MSM7620,If you need more pinouts please download MSM7620's pdf datasheet.

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