# US 10,121,360 B2 · Backup audio routing integrated into card cage with supervisory circuit

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- Number: US 10,121,360 B2
- Document ID: US10121360B2
- Status: Granted
- Kind: B2
- Application number: 15/120,397
- Filed: 2014-03-10
- Published: 2017-03-02
- Granted: 2018-11-06
- Earliest claimed: 2014-03-10
- Assignees: Siemens Schweiz AG
- Applicants: Siemens Schweiz AG
- Inventors: Leonid Ayzenshtat; Harald Schermann
- Web page: https://patentgrep.com/patent/US10121360B2

## CPC

- G08B 29/10: Monitoring of the annunciator circuits
- G08B 17/06: Electric actuation of the alarm, e.g. using a thermally-operated switch
- H03F 1/526: {protecting by using redundant amplifiers}
- H03F 3/183: with semiconductor devices only
- H04R 3/007: {Protection circuits for transducers}
- H04R 29/007: {for public address systems (public address systems per se H04R27/00)}
- H04R 2420/01: Input selection or mixing for amplifiers or loudspeakers
- H04R 2420/05: Detection of connection of loudspeakers or headphones to amplifiers
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- H03F: AMPLIFIERS
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)

## Abstract

Methods and systems consistent with the present invention provide an improved system that supervises the operation of a backup amplifier. The method comprises receiving an indication that a primary amplifier failed; determining a configuration of the primary amplifier; and configuring the backup amplifier to match the configuration of the primary amplifier.

## Claims

### Claim 1

A voice control panel comprising:
a first amplifier slot having a backup input;
a second amplifier slot having a backup output;
a third amplifier slot having a backup output; and
a switch connected to the backup input of the first amplifier slot that switches between the backup output of the second amplifier slot and the backup output of the third amplifier slot so that the backup input of the first amplifier slot is either connected to the backup output of the second amplifier slot or to the backup output of the third amplifier slot.

### Claim 2 (depends on 1)

The voice control panel of claim 1, further comprising a fourth amplifier slot having a backup input, wherein the backup output of the third amplifier slot is connected to the backup input of the fourth amplifier slot.

### Claim 3 (depends on 1)

The voice control panel of claim 1, the second amplifier slot further including a backup input the switch configured to toggle between the backup input of the second amplifier slot and the backup output of the second amplifier slot.

### Claim 4 (depends on 3)

The voice control panel of claim 3, wherein the backup output of the third amplifier slot is connected to the backup input of the second amplifier slot.

### Claim 5 (depends on 1)

The voice control panel of claim 1, further comprising a fourth amplifier slot having a backup input, wherein the backup output of the third amplifier slot is connected to the backup input of the fourth amplifier slot.

### Claim 6 (depends on 1)

The voice control panel of claim 1, wherein the backup input of the first amplifier slot is connected to the backup output of the second amplifier slot.

### Claim 7 (depends on 1)

The voice control panel of claim 1, wherein the backup input of the third amplifier slot is connected to the backup output of the second amplifier slot.