Cochlear SPrint Sound Processor Información técnica descargar pdf (Pagina 14)

SECTION ONE | CLINICAL GUIDANCE

1.2 ADJUSTMENTS TO CHANNEL GAINS

In addition to the user-controlled microphone sensitivity that determines the

overall gain applied to the input signal, each channel in the MAP includes an

adjustable gain control. These individual channel gains are set in the MAP

when the clinician programs the sound processor. The default gain setting is 0

dB across all channels. Changing the channel gains is analogous to adjusting an

equalizer on a stereo system, which emphasizes or de-emphasizes pitches in a

particular channel. The gain is applied to each channel output and affects the

stimulation levels sent to the implant.

In the SPEAK and ACE strategies, the channel gains are applied before the

maxima are selected. Therefore, the gain settings can inﬂuence the channels

selected for stimulation. Reducing the gain on a given channel de-emphasizes

that channel’s output, making it less likely to be selected. Conversely,

increasing the gain emphasizes the output. In CIS strategies, all of the

activated channels are stimulated during each frame, regardless of channel

amplitude. Therefore, channel gains do not inﬂuence the channels selected for

stimulation. However, the gain settings increase or decrease stimulation levels.

The main clinical application of channel gains is to alter the perceived sound

quality of the MAP. You can adjust these gains during live-voice testing of the

MAP to improve the sound quality. The gains can be adjusted via the Gains

Toolbar shaping options. Alternatively, you can enter gain values into the data

grid, by clicking on the data grid with the right mouse button and selecting

‘Show Gains’. Alternatively, you can enter gain values into the data grid, by

clicking on the data grid with the right mouse button and selecting ‘Show Gains’.

It should be noted that if ADRO is applied to all preset channel gain adjustments

are voided. ADRO will adjust channel gains based on environment.

1.3 BASIC SOUND PROCESSOR INFORMATION

• Microphone Sensitivity Control – determines the minimum input signal

level required for stimulation. At higher sensitivity settings, less acoustic

energy, that is a lower SPL, is required to cause stimulation. At lower

sensitivity settings, greater acoustic energy, that is a higher SPL, is required

to cause stimulation.

• Volume Control – controls the maximum amount of stimulation. It

allows the implant recipient to change the loudness of sound. Maximum

volume equals C-level stimulation.

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Cochlear SPrint Sound Processor Información técnica Pagina 14