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公开(公告)号：EP0732036A1
公开(公告)日：1996-09-18
申请号：EP94924834.0
申请日：1994-08-02
发明人： LUDVIGSEN, Carl
CPC分类号： H03G9/24 , H03G9/005 , H03G9/025 , H04R25/356 , H04R25/505 , H04R2225/43
摘要： A circuitry is disclosed for a preferably programmable hearing aid with at least one microphone, at least one electronic signal processing circuit (3), at least one channel and one output transducer (7). The electronic signal processing circuit (3) has a regulation circuit for continuously determining or calculating one or several percent values of the input signal based on a continuous analysis and evaluation of the frequency and/or amplitude distribution of the input signal. These percent values are directly or indirectly used as control signals for regulating the amplification and/or the frequency response of the electronic signal processing circuit. At least one percentage generator (10) connected at the input side consists of an integrator (11), a first incrementing control stage (12) connected to the integrator (11) and a second counting down control stage (13) connected to the first control stage (12), as well as a comparing stage (14) with at least two inputs. The input of the circuit is directly or indirectly connected to the input of the comparing stage (14), whereas a second input of the comparing stage is connected to the output of the integrator (11) and is directly or indirectly connected to the signal processing circuit (3) through a combination and control logic (15) by at least one control line. Both outputs of the comparing stage (14) are connected to the control stage (12) or to the control stage (13).
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公开(公告)号：EP1097607A1
公开(公告)日：2001-05-09
申请号：EP99908852.9
申请日：1999-02-05
IPC分类号： H04R25/00
CPC分类号： H04R25/407 , H04R25/505
摘要： The invention relates to a hearing aid with beam forming properties, having at least two microphone channels (1a, 1b) for at least two microphones (2a, 2b), said microphone channels comprising each an analog to digital converter (3a, 3b) and having at least one programmable or program controlled signal processor (5), as well as a digital to analog converter, and at least one receiver and a battery for power supply. The invention particularly comprises in each microphone channel (1a, 1b) a sigma-delta-type analog to digital converter (3a, 3b) including a digital low pass filter and a decimator (4) for converting a 1 Bit Stream of a high clock frequency into a digital word sequence of a lower clock frequency. At least one of said at least two microphone channels contains a controllable delay device (6) connected to the input side of the respective digital low pass filter and decimator (4) of said channel, said delay device (6) being controllable by said at least one signal processor (5). Preferably the delay device (6) is integrated into said sigma-delta-ADC (3).
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公开(公告)号：EP1059016A1
公开(公告)日：2000-12-13
申请号：EP97950008.9
申请日：1997-12-23
发明人： LUDVIGSEN, Carl
IPC分类号： H04R25/00
CPC分类号： H04R25/356 , H04R25/505 , H04R2225/41
摘要： Automatic gain control in a hearing aid is effected by detecting an input sound level and/or an output sound level and adapting the output sound level supplied by the hearing aid in response to the detected sound level by controlling the gain of the hearing aid towards an actual desired value of the output sound level. The gain control is effected at increases and decreases, respectively, of the input sound level by adjusting the gain towards the actual desired value with an attack time and a release time, respectively, which are adjusted in response to the detected sound level to a relatively short duration providing fast gain adjustment at high input and/or output sound levels and to a relatively long duration providing slow gain adjustment at low input and/or output sound levels.
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公开(公告)号：EP0732036B1
公开(公告)日：1997-05-21
申请号：EP94924834.8
申请日：1994-08-02
发明人： LUDVIGSEN, Carl
IPC分类号： H04R25/00
CPC分类号： H03G9/24 , H03G9/005 , H03G9/025 , H04R25/356 , H04R25/505 , H04R2225/43
摘要： A circuitry is disclosed for a preferably programmable hearing aid with at least one microphone, at least one electronic signal processing circuit (3), at least one channel and one output transducer (7). The electronic signal processing circuit (3) has a regulation circuit for continuously determining or calculating one or several percent values of the input signal based on a continuous analysis and evaluation of the frequency and/or amplitude distribution of the input signal. These percent values are directly or indirectly used as control signals for regulating the amplification and/or the frequency response of the electronic signal processing circuit. At least one percentage generator (10) connected at the input side consists of an integrator (11), a first incrementing control stage (12) connected to the integrator (11) and a second counting down control stage (13) connected to the first control stage (12), as well as a comparing stage (14) with at least two inputs. The input of the circuit is directly or indirectly connected to the input of the comparing stage (14), whereas a second input of the comparing stage is connected to the output of the integrator (11) and is directly or indirectly connected to the signal processing circuit (3) through a combination and control logic (15) by at least one control line. Both outputs of the comparing stage (14) are connected to the control stage (12) or to the control stage (13).
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