Multiple message multilevel analog signal recording and...

Telecommunications – Radiotelephone system – Message storage or retrieval

Reexamination Certificate

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C455S333000, C455S575900

Reexamination Certificate

active

10752630

ABSTRACT:
A multilevel analog recording and playback system is described. The analog recording and playback system provides a variety of analog processing functions to enhance system level integration. The analog recording and playback system is an fully configurable integrated device that includes a plurality of signal paths, a microphone automatic gain control (“AGC”) circuit, volume control and filtering circuit, speaker driver circuit, gain selectable analog input, auxiliary input and output paths, configurable summation amplifiers having mixing features, multilevel analog memory storage array, and user selectable programming duration.

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ISD (Information Storage Devices, Inc.), ISD4003 Series Single-Chip Voice Record/Playback Devices 4-,5-,6-, and 8-Minute Durations, 1997, pp. 1-25.
ISD (Information Storage Devices, Inc.), “Applications Brief #26, Upgrading an ISD33000 Design to an ISD4000 series device”, Jun. 18, 1997.
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ISD (Information Storage Devices, Inc.), ISD33120/150/180/240 Products Single-Chip Voice Record/Playback Devices 2-, 2.5-, 3-, and 4-Minute Durations, Apr. 1998, pp. 1-26.

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