MSM7620

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 MSM7620 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.

Note: If the object is to cancel line echo, the use of the MSM7602 is recommended, for the MSM7602 is provided with a howling detect control pin. In addition, the MSM7602, while having characteristics equivalent to the MSM7620, is packaged small.