Cochlear SPrint Sound Processor Informações Técnicas descarregar pdf (Página 30)

SECTION ONE | CLINICAL GUIDANCE

Table 1: The differences between SPEAK, CIS/CIS (RE) and ACE/ACE (RE)

Strategy

No. of

stimulation

sites

Stimulation rates

per channel (Hz)

No. of maxima / channels

stimulated per frame

SPEAK 20 250 6 to 10

CIS/CIS (RE) 4, 6, 8 or 12 900, 1200, 1800,

2400 or 3500

4, 6, 8 or 12 (up to 8 for

1800, 2400, 3500 Hz

ACE/ACE (RE) 22 250, 500, 720, 900,

1200, 1800, 2400

or 3500

up to 20 (depending upon

stimulation rate selected)

1.9.1 ACE

™

/ACE (RE)

ACE (Advanced Combination Encoder) combines the detailed spectral

representation of SPEAK and the high stimulation rates of CIS to produce a

very rich representation of sound. This strategy gives the clinician enormous

ﬂexibility to optimize sound processing for each individual. Using ACE, the

clinician selects the number of stimulation channels (maximum = 22), the

number of maxima and the per channel stimulation rate. The TSR (number

of maxima multiplied by the per channel rate) depends upon the implant

type (e.g. Nucleus 24 implants vs Freedom vs CI500 series implants). Custom

Sound

™

provides a list of available rates based upon the type of implant used

by the recipient. ACE (RE) is speciﬁc to the Freedom

™

and CI500 series cochlear

implants. These implants provide higher stimulation rates with a maximum

TSR of 31,500 pps. The clinician may choose per channel rates of 1800, 2400,

and 3500 pps and number of maxima (maximum = 9 at 3500 pps, 8 at 1800

and 10 at 2400 pps). By default, the software chooses 8 maxima and 900 pps

for a TSR of 7200 pps. For more information, see Programming Principles

and Frequency-to-Channel Allocation.

The following electrodogram (Figure 5) shows how ACE represents the English

word ‘choice’. Notice the amount of spectral and temporal detail this strategy

provides and how well it represents the spectrogram in Figure 6.

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 77 78

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