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SENSO P38 SENSO P38 100% digital, High Power BTE • Programmable (LP2 or COMPASS) • 3 channel DSP with VarioSlope™ filters • Sound Stabilizer™ • Enhanced Dynamic Range Compression • Automatic Feedback Manager • Optional Digital Comfort VC Technical Data OSPL90: 711 Ear simulator 2cc Coupler Peak 144 dB SPL 138 dB SPL 1000 Hz 143 dB SPL 138 dB SPL HAIC 139 dB SPL 134 dB SPL Battery Drain (st. by) Battery Drain (typical) The SENSO P38 features, together with the elegant design, make it a natural extension of hearing rather than just an aid. The SENSO Digital Signal Processor (DSP) works with 20-bit representation of the signal and a sampling rate of 32 kHz. SENSO P38 is a superbly engineered hearing aid in the renowned Widex tradition. Battery Life (675ZA, 600 mAh)* Relative Telecoil Sensitivity** • 3 channel DSP with VarioSlope™ filters for accurate and versatile fitting. • Enhanced Dynamic Range Compression to maximize speech intelligibility and listening comfort. • Sound Stabilizer™ for fast adjustment to sudden changes in the sound environment while maintaining speech intelligibility and speech dynamic range. Recommended for: • Moderately severe to profound hearing losses. • All configurations of hearing loss including conductive, fluctuating, sloping, flat and reverse slope losses. • Persons wanting the digital solution to their hearing loss. Suggested Fitting Range • Automatic Feedback Manager (patent pending) for reduction of acoustic feedback. • Optional Digital Comfort Volume Control (± 6 dB range) with beep-tone adjustment indicator. 140 130 120 1.2 mA 110 500 hours + 3 dB 1% IRIL (900/1800 MHz) 0/15 dB SPL Typical data that mimic Ref. Test Gain conditions (HTL values of 85, 100 and 100 with an input of 65 dB SPL). Under more severe conditions (HTL values of 115, 120 and 120, and an input of 80 dB SPL) where High Power batteries are necessary, battery life can drop to 100 hours. ** A telecoil input of 100 mA/m will equal a microphone input of 70 dB SPL. SENSO P38 offers you: Output dB SPL 1.0 mA Harmonic Distortion * Maximum Output (ear simulator - IEC711) A B 100 90 100 200 500 1000 Frequency A : AOC disabled 2000 5000 Hz B : AOC enabled Maximum Output (2cc coupler - IEC126) Output dB SPL 140 130 A B 120 110 100 90 100 200 500 1000 Frequency A : AOC disabled 2000 5000 Hz B : AOC enabled AOC (Automatic Output Control) is an output limiting compression circuit that eliminates distortion from saturation. It can be turned on (=factory setting) and off from the programming devices. • M, MT, and T settings available. The “T” and “MT” responses are compensated to preserve the frequency and output level of the acoustic signal. • The microphone and telecoil inputs each have their own Sigma-Delta converter allowing a telecoil with a digital anti-hum filter to reduce interference from the mains. • Long battery life of approximately 500 hours. • Low battery beep-tone indicator. • Minimal audible internal noise due to special processing. • Digital Power Drive™ (DPD). SENSO’s Direct Digital Drive (patent pending) developed for high power instruments. • Direct audio input. (P!P38!3101!10154) Printed by Widex / 7-98 P P38 3101 101 SENSO P38 Sound Stabilizer™ In automatic hearing aids, the gain adjustment has to work fast in order to adapt quickly to changes in the environment. The fast gain adjustment of such systems will often cause “pumping” effects which can be very annoying for the user, especially in noisy surroundings, and may result in reduced speech comprehension. Automatic Feedback Manager VarioSlope™ filters Traditional filters VarioSlope™ filters Amplified Speech Enhanced Dynamic Range Compression Output dB HL 100 Enhanced Dynamic Range Compression works to present all signals to the SENSO P38 user at a natural sensation level. HTL 80 60 40 In these two audiograms, HTLs and UCLs of a profound hearing loss are shown. For each of three different speech signals, both unamplified and amplified speech spectra are shown. 20 20 The Sound Stabilizer™ applies different regulation speeds to different signals. This forces the SENSO P38 to keep a steady gain in stable sound environments, optimizing speech intelligibility, but ensuring the needed fast adaptation to changes in the acoustic environment. After shouting or other loud sounds, P38 will quickly turn up amplification to allow listening to normal speech. Unamplified Speech 40 60 80 100 Input dB HL SENSO P38 has a built-in Automatic Feedback Manager which minimizes feedback. Soft Speech (53 dB SPL) It is worth noting that: Normal Speech (62 dB SPL) The Enhanced Dynamic Range Compression system requires high gain for low level inputs. Depending on the earmould quality, the high gain will increase the risk of feedback in quiet surroundings. 1.Amplified speech is made audible in all cases, as it is reproduced between the users’ HTL and UCL. Loud Speech (75 dB SPL) 2. Amplification is different for different levels of speech. Comparison of amplified and unamplified speech reveals 55 dB amplification in the low frequencies for soft speech and 40 dB for loud speech. In each of the three channels, the Automatic Feedback Manager verifies if the high gain is possible without feedback. If not, the gain in that particular channel is automatically reduced. This will influence soft sounds only. The Automatic Feedback Manager may help users to acclimatize to the new “hearing experience”. A temporary reduction of the max gain in one or more channels will set the hearing aid to a level that the wearer is accustomed to. Later, the gain can be increased gradually to the prescribed values in order to optimize audibility of soft sounds. 500 Hz / Low Band 1 kHz / Mid Band Output dB HL Output dB HL UCL UCL 120 100 120 HTL 100 HTL When fitting multi-channel hearing aids, traditional filters with fixed orders rarely give the right compensation over the entire frequency range. Moderately sloping hearing losses are best fitted using low order filters to avoid peaks or valleys in the compensation, while precipitously sloping hearing losses need high order filters to obtain appropriate compensation. Programming SENSO P38 can be programmed using the LP2 Portable Programmer or via a PC using the HI-PRO interface and NOAH/COMPASS software. Please refer to the SENSO P37/P38 programming manual. 80 80 60 60 40 40 20 40 60 80 100 Input dB HL 20 40 60 80 100 Input dB HL 3 kHz / High Band Output dB HL When fitting the 3 channel SENSO P38, the VarioSlope™ filters provide natural slopes for most types of hearing loss in order to ensure optimal fitting between the frequency channels. UCL 120 HTL 100 80 60 40 20 40 60 80 100 Input dB HL Dynamic I/O curve for a speech signal Enhanced Dynamic Range Compression can also be described through I/O-curves. The steady-state I/O-curves (black lines) show how amplification is adjusted as a function of the input level. For low inputs, amplification is reduced to minimize microphone noise and feedback. For medium level inputs, it is reduced gradually so that soft sounds are amplified more than loud sounds. The level dependent amplification allows soft sounds to become audible, without risking discomfort from high sound levels. Profound hearing losses will not suffer from excessive amplification of loud sounds. The grey curves show dynamic I/O curves for normal speech. It is reproduced almost linearly, but the average amplification is determined according to the non-linear steady-state I/O curve. HTL and UCL values are inserted as dotted lines. Sound reproduced below HTL cannot be heard. Note how speech is constantly being reproduced above HTL, without exceeding the UCL. SENSO P38 Sound Stabilizer™ In automatic hearing aids, the gain adjustment has to work fast in order to adapt quickly to changes in the environment. The fast gain adjustment of such systems will often cause “pumping” effects which can be very annoying for the user, especially in noisy surroundings, and may result in reduced speech comprehension. Automatic Feedback Manager VarioSlope™ filters Traditional filters VarioSlope™ filters Amplified Speech Enhanced Dynamic Range Compression Output dB HL 100 Enhanced Dynamic Range Compression works to present all signals to the SENSO P38 user at a natural sensation level. HTL 80 60 40 In these two audiograms, HTLs and UCLs of a profound hearing loss are shown. For each of three different speech signals, both unamplified and amplified speech spectra are shown. 20 20 The Sound Stabilizer™ applies different regulation speeds to different signals. This forces the SENSO P38 to keep a steady gain in stable sound environments, optimizing speech intelligibility, but ensuring the needed fast adaptation to changes in the acoustic environment. After shouting or other loud sounds, P38 will quickly turn up amplification to allow listening to normal speech. Unamplified Speech 40 60 80 100 Input dB HL SENSO P38 has a built-in Automatic Feedback Manager which minimizes feedback. Soft Speech (53 dB SPL) It is worth noting that: Normal Speech (62 dB SPL) The Enhanced Dynamic Range Compression system requires high gain for low level inputs. Depending on the earmould quality, the high gain will increase the risk of feedback in quiet surroundings. 1.Amplified speech is made audible in all cases, as it is reproduced between the users’ HTL and UCL. Loud Speech (75 dB SPL) 2. Amplification is different for different levels of speech. Comparison of amplified and unamplified speech reveals 55 dB amplification in the low frequencies for soft speech and 40 dB for loud speech. In each of the three channels, the Automatic Feedback Manager verifies if the high gain is possible without feedback. If not, the gain in that particular channel is automatically reduced. This will influence soft sounds only. The Automatic Feedback Manager may help users to acclimatize to the new “hearing experience”. A temporary reduction of the max gain in one or more channels will set the hearing aid to a level that the wearer is accustomed to. Later, the gain can be increased gradually to the prescribed values in order to optimize audibility of soft sounds. 500 Hz / Low Band 1 kHz / Mid Band Output dB HL Output dB HL UCL UCL 120 100 120 HTL 100 HTL When fitting multi-channel hearing aids, traditional filters with fixed orders rarely give the right compensation over the entire frequency range. Moderately sloping hearing losses are best fitted using low order filters to avoid peaks or valleys in the compensation, while precipitously sloping hearing losses need high order filters to obtain appropriate compensation. Programming SENSO P38 can be programmed using the LP2 Portable Programmer or via a PC using the HI-PRO interface and NOAH/COMPASS software. Please refer to the SENSO P37/P38 programming manual. 80 80 60 60 40 40 20 40 60 80 100 Input dB HL 20 40 60 80 100 Input dB HL 3 kHz / High Band Output dB HL When fitting the 3 channel SENSO P38, the VarioSlope™ filters provide natural slopes for most types of hearing loss in order to ensure optimal fitting between the frequency channels. UCL 120 HTL 100 80 60 40 20 40 60 80 100 Input dB HL Dynamic I/O curve for a speech signal Enhanced Dynamic Range Compression can also be described through I/O-curves. The steady-state I/O-curves (black lines) show how amplification is adjusted as a function of the input level. For low inputs, amplification is reduced to minimize microphone noise and feedback. For medium level inputs, it is reduced gradually so that soft sounds are amplified more than loud sounds. The level dependent amplification allows soft sounds to become audible, without risking discomfort from high sound levels. Profound hearing losses will not suffer from excessive amplification of loud sounds. The grey curves show dynamic I/O curves for normal speech. It is reproduced almost linearly, but the average amplification is determined according to the non-linear steady-state I/O curve. HTL and UCL values are inserted as dotted lines. Sound reproduced below HTL cannot be heard. Note how speech is constantly being reproduced above HTL, without exceeding the UCL. SENSO P38 SENSO P38 100% digital, High Power BTE • Programmable (LP2 or COMPASS) • 3 channel DSP with VarioSlope™ filters • Sound Stabilizer™ • Enhanced Dynamic Range Compression • Automatic Feedback Manager • Optional Digital Comfort VC Technical Data OSPL90: 711 Ear simulator 2cc Coupler Peak 144 dB SPL 138 dB SPL 1000 Hz 143 dB SPL 138 dB SPL HAIC 139 dB SPL 134 dB SPL Battery Drain (st. by) Battery Drain (typical) The SENSO P38 features, together with the elegant design, make it a natural extension of hearing rather than just an aid. The SENSO Digital Signal Processor (DSP) works with 20-bit representation of the signal and a sampling rate of 32 kHz. SENSO P38 is a superbly engineered hearing aid in the renowned Widex tradition. Battery Life (675ZA, 600 mAh)* Relative Telecoil Sensitivity** • 3 channel DSP with VarioSlope™ filters for accurate and versatile fitting. • Enhanced Dynamic Range Compression to maximize speech intelligibility and listening comfort. • Sound Stabilizer™ for fast adjustment to sudden changes in the sound environment while maintaining speech intelligibility and speech dynamic range. Recommended for: • Moderately severe to profound hearing losses. • All configurations of hearing loss including conductive, fluctuating, sloping, flat and reverse slope losses. • Persons wanting the digital solution to their hearing loss. Suggested Fitting Range • Automatic Feedback Manager (patent pending) for reduction of acoustic feedback. • Optional Digital Comfort Volume Control (± 6 dB range) with beep-tone adjustment indicator. 140 130 120 1.2 mA 110 500 hours + 3 dB 1% IRIL (900/1800 MHz) 0/15 dB SPL Typical data that mimic Ref. Test Gain conditions (HTL values of 85, 100 and 100 with an input of 65 dB SPL). Under more severe conditions (HTL values of 115, 120 and 120, and an input of 80 dB SPL) where High Power batteries are necessary, battery life can drop to 100 hours. ** A telecoil input of 100 mA/m will equal a microphone input of 70 dB SPL. SENSO P38 offers you: Output dB SPL 1.0 mA Harmonic Distortion * Maximum Output (ear simulator - IEC711) A B 100 90 100 200 500 1000 Frequency A : AOC disabled 2000 5000 Hz B : AOC enabled Maximum Output (2cc coupler - IEC126) Output dB SPL 140 130 A B 120 110 100 90 100 200 500 1000 Frequency A : AOC disabled 2000 5000 Hz B : AOC enabled AOC (Automatic Output Control) is an output limiting compression circuit that eliminates distortion from saturation. It can be turned on (=factory setting) and off from the programming devices. • M, MT, and T settings available. The “T” and “MT” responses are compensated to preserve the frequency and output level of the acoustic signal. • The microphone and telecoil inputs each have their own Sigma-Delta converter allowing a telecoil with a digital anti-hum filter to reduce interference from the mains. • Long battery life of approximately 500 hours. • Low battery beep-tone indicator. • Minimal audible internal noise due to special processing. • Digital Power Drive™ (DPD). SENSO’s Direct Digital Drive (patent pending) developed for high power instruments. • Direct audio input. (P!P38!3101!10154) Printed by Widex / 7-98 P P38 3101 101