A cochlear implant squeezes rich sound into just a handful of "channels." Drag the channel count and use your own ears to feel why fewer channels make speech blur.
Pick a sound — a built-in sample, an uploaded file, or your live microphone. Toggle "original / processed" to compare, drag the channel count, and watch each frequency channel light up. Headphones are recommended, especially in microphone mode to avoid feedback.
A healthy ear has tens of thousands of hair cells arranged along the cochlea as a fine frequency map. A cochlear implant bypasses the damaged hair cells and electrically stimulates the auditory nerve with a row of electrodes — and the information it can carry is essentially what this simulator does: slice sound into a few frequency bands and keep only each band's "loudness envelope."
A microphone captures the sound and splits it by frequency into several bands, each mapped to one place on the cochlea and one electrode.
Each band keeps only the "envelope" of how its energy rises and falls over time, discarding the fine waveform and pitch detail.
The envelope modulates a carrier (noise or sine) to refill each band.
A real device turns this into electrical pulses on the auditory nerve; the simulator sums the bands and plays them for you.
About 15,000 hair cells form an extremely fine frequency gradient along the cochlea, spreading sound out continuously.
Usually just 12–22 electrodes, and current spread cuts the "effective" channels down to about ~8.
From a sound wave in the air to the moment the brain "hears" it, sound passes through several stages. The pipeline below runs in real time — follow the dots and see where the implant takes over work that once belonged to the ear.
The cochlear implant is a remarkable technology that lets many people follow conversation in quiet. But what it delivers is a "downsampled" version of sound — only a few channels, only loudness envelopes. These are its common weak spots. You can hear each one for yourself in the simulator above.
Melody and harmony rely on fine pitch information, which the vocoder mostly throws away. Rhythm still comes through, but tunes sound flat and distorted.
Mandarin and Cantonese distinguish meaning by pitch contour (mā/má/mǎ/mà). Implants encode pitch poorly, so tone recognition is a real challenge for children learning these languages.
With background noise or many people talking at once, recognition drops sharply — too few channels make it hard to separate the target voice from the noise.
Telling which direction a sound comes from needs fine timing and level differences between the two ears. A single implant can barely localize, and even bilateral ones fall well short of normal hearing.
It doesn't "restore" the old hearing — it delivers a brand-new, simplified signal. The brain relies on plasticity and long-term training to gradually "read" it.
Current from neighboring electrodes spreads and overlaps; combined with "dead regions" and differences in insertion depth, the truly independent channels are far fewer than the electrode count.
Listen first, then guess how many channels were used. Play and answer anonymously — no account needed.
Browse published read-aloud cards and play cochlear-simulated audio from the same content library as the mini program. Clips are already processed — the site plays them as-is, without running the vocoder again.
A baby's brain is in a golden window for learning language. The earlier and richer the auditory input, the better later spoken-language and literacy development tends to be. That is why newborn hearing screening and early intervention are emphasized again and again.
Complete initial/repeat screening before discharge or by one month to catch possible hearing issues early.
More thorough audiological testing clarifies the type and degree, informing the plan.
Fit hearing aids and start auditory–verbal training; for severe/profound loss with limited hearing-aid benefit, evaluate for a cochlear implant.
Speech therapy, everyday family interaction, and educational support are the long, crucial part — the device is only the beginning.
Families facing hearing loss can make different choices: some follow a spoken-language, auditory–verbal path, some choose sign language, and some use a bilingual-bimodal approach. A cochlear implant is not the only "right" answer, and the Deaf community has its own language and cultural identity. Respecting the values of the child and family, and communicating fully with a professional team, usually matters more than arguing over "which path is better."
Wireless remote microphones, classroom FM systems, captions, and visual cues all improve access in real settings (especially noisy classrooms) beyond the device itself. Peer acceptance and a strong sense of self matter just as much to development.