Multiple function, bi-directional input/output interface for...

Details Multiple function, bi-directional input/output interface for... Multiple function, bi-directional input/output interface for...

2005-11-22

2005-11-22

Grier, Laura A. (Department: 2644)

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

C381S059000

Reexamination Certificate

active

06968065

ABSTRACT:
A multifunction analog input/output interface for a sound processing system reduces the number of I/O pins and system components by using a speaker as an output device, an input device, and/or a control device. The system includes an integrated circuit containing a multifunction pin for connection to the speaker, an output circuit that drives the speaker, and an input circuit that receives a signal from the speaker when sound or touching the speaker moves a magnet in the speaker. An activation circuit coupled to the multifunction pin, activates an operation of the integrated circuit when the speaker provides a signal above a threshold level. Thus, a single pin serves three functions, sound signal input, sound signal output, and operation activation. The operation activated can be, for example, a playback or record operation. A delay element in the activation circuit prevents reactivation of an operation until vibrations in the speaker from a completed operation have died away. One embodiment of the invention provides an integrated circuit having only three I/O pins but capable of playing back a sound signal recorded in the integrated circuit.

REFERENCES:
patent: 3979566 (1976-09-01), Willy
patent: 4554411 (1985-11-01), Armstrong
patent: 4677657 (1987-06-01), Nagata et al.
patent: 5483577 (1996-01-01), Gulick
patent: 5526408 (1996-06-01), Yekutiely
patent: 5531600 (1996-07-01), Baer et al.
patent: 5593236 (1997-01-01), Bobry
patent: 5595445 (1997-01-01), Bobry
patent: 5634730 (1997-06-01), Bobry
patent: 5812561 (1998-09-01), Giles et al.
Dallas Semiconductor, “DS2434 Battery Identification Chip”, pp. 1-20, Jul. 1997.

Affiliated with

Also associated with

Rating

Multiple function, bi-directional input/output interface for... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multiple function, bi-directional input/output interface for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple function, bi-directional input/output interface for... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3478695