Cochlear SPrint Sound Processor Información técnica descargar pdf (Pagina 69)

CLINICAL GUIDANCE | SECTION TWO

Give clear instructions to the recipient before conducting the pitch-ranking

procedure to ensure they understand the task is to rank pitch and not loudness.

1. (Optional) Sweep across all active channels to ﬁnd two channels that are

clearly distinct by pitch (e.g. approximate lowest and highest) as this can

make the pitch ranking task easier.

2. Select the two channels you wish to compare by clicking on the channel

number until it changes to yellow.

3. In the sweep toolbar, select C-levels and Selected channels.

4. Ask the recipient to tell you which of the following two sounds is higher.

5. Sweep these two channels by using the sweep left or right icon, or by using

the L or R keys - remember the order you swept.

6. Based upon the recipient feedback, drag the lower pitch channel to the far

left channel position (i.e. channel 22), and the higher pitch channel to the

next channel position (i.e. channel 21).

7. Unselect the channel numbers.

8. To remind yourself which channels you have tested and ordered, consider

either a) using the NRT marker channel as a ‘ﬂag’, or b) ensuring there

is always at least one deactivated channel separating the ordered from

unordered channels.

9. Select any other channel in the unordered list, then perform comparisons

with the lowest pitch channel in the ordered list. If the new channel is lower

than the lowest ordered channel, drag it to the new lowest position. If not,

compare the new channel to the highest ordered channel and if higher drag

it to the new highest position. If the new channel is between the two, drag

it to the position between the existing lowest and highest channels.

10.Repeat the above procedure for each new channel, comparing ﬁrst with

the lowest and then the highest channel. Then compare it with channels in

between. Note that as the list of ordered channels increases, the number of

comparisons needed will also increase. It is generally suggested that after

comparing the new channel with the highest and lowest channels, to next

select a channel approximately half-way between and gradually iterate

to the correct channel position. This procedure works well provided no

channel becomes placed out of order.

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Cochlear SPrint Sound Processor Información técnica Pagina 69