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CLINICAL GUIDANCE | SECTION ONE

Absence of ESRT does not mean the implant is not working or the recipient

is not hearing. There can be other causes for the absence of the response,

such as middle ear disease.

1.15 GUIDANCE FOR FM FITTINGS

1.15.1 CP810 Sound Processors

FM systems are designed to improve a recipient’s signal to noise ratio (SNR)

to allow them to hear better in noise. They are useful when the signal comes

from a consistent source. For example, children may use an FM system in the

classroom to hear the teacher over other classroom sounds. Adults may use

an FM system in business meetings to hear the presenter over the sound of a

projector fan and other ambient noise. The Nucleus

CP810 sound processor

can incorporate FM signal inputs through the following devices :

• an FM ear-level receiver connected to the sound processor using the Euro

Accessory Adaptor

• a neckloop receiver and the sound processor’s telecoil, and

• an ESPrit™ FM cable connected to a bodyworn receiver

Ear-level FM receivers (using the Euro Accessory Adaptor): The microphone

of the FM transmitter picks up the speaker’s voice and sends it via a speciﬁc

radio frequency (RF) channel to the FM receiver. When the transmitter and the

receiver are turned on, the wireless connection is established between the two

devices, since most current devices will automatically synchronize to the same

channel (this can be done manually if required). The Euro Accessory Adaptor

connects an ear-level receiver to the CP810 sound processor via the accessory

socket.

Neckloop receivers: A neckloop is a necklace-size loop of covered wire that

functions as the FM receiver in an FM system. The sound processor’s telecoil

is used to pick up the electromagnetic ﬁeld that the neckloop produces.The

microphone of the FM transmitter picks up the speaker’s voice and sends it via

a speciﬁc radio frequency (RF) channel to the FM receiver. The FM neckloop

receiver is worn around the neck of someone who has a sound processor with

a telecoil. When the transmitter and the receiver are turned on, the wireless

connection is established between the two devices, since most current devices

will automatically synchronize to the same channel (this can be done manually

if required). A neckloop receiver used with a telecoil is the interface of choice of

many CI users.

ESPrit FM cables: The ESPrit FM cable connects the CP810 Sound Processor

to a commercially available body-worn FM receiver using the Freedom

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