Browse Prior Art Database

Tone Generator

IP.com Disclosure Number: IPCOM000044089D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Ferry, M: AUTHOR [+3]

Abstract

This article describes a microprocessor-controlled tone generator. The figure shows that this tone generator comprises a 4-bit CMOS (complementary metal oxide semiconductor) microprocessor and an integrator (Operational Amplifier + RC). The sine wave is synthesized using the linear ramp approach, and sampling does not recur at regular intervals. The ROM microprocessor contains: 1. The code needed to generate the sinusoidal waveform by the integration of different currents through resistors R1, R2, R3 and capacitor C of the integrator. A three-state driver or open collector (outputs 1, 2, 3) is used to generate positive and negative currents, i.e., positive and negative slopes. 2. The code needed to determine the tone duration (i.e., 300 ms). 3.

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Tone Generator

This article describes a microprocessor-controlled tone generator. The figure shows that this tone generator comprises a 4-bit CMOS (complementary metal oxide semiconductor) microprocessor and an integrator (Operational Amplifier + RC). The sine wave is synthesized using the linear ramp approach, and sampling does not recur at regular intervals. The ROM microprocessor contains: 1. The code needed to generate the sinusoidal waveform by the integration of different currents through resistors R1, R2, R3 and capacitor C of the integrator. A three- state driver or open collector (outputs 1, 2, 3) is used to generate positive and negative currents, i.e., positive and negative slopes. 2. The code needed to determine the tone duration (i.e., 300 ms). 3. The code needed to operate the generator as expected when the input commands (generate a tone) are activated. 4. Information allowing the gain of an amplifier to be switched through outputs 4, 5, 6, in order to modify the tone amplitude.

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