This post describes for the semiconductor MC14401.
The function of this semiconductor is CODEC Filter PCM Mono Circuit.
The manufacturer of this part is Motorola.
See the preview image and the PDF file for more information.
The MC14400, MC14401 are all per channel codec-filter PCM mono-circuits. These devices perform the voice digitizing and recovery, as well as the band limiting and signal restoration necessary in PCM systems. The MC14401 is the same device, but offered in an 18-pin package.