 Device for use in an audio signal processing system |
| It is an object of the present invention to provide a device for use in an audio signal processing ... |
|
| Tone control circuit |
| What is claimed is: 1. An electronic tone control circuit comprising, an integrator circuit having ... |
|
| Frequency characteristic adjusting circuit |
| An object of this invention is to provide a simple-structured frequency characteristic adjusting ... |
|
| Method for reducing the search complexity in analysis-by-synthesis coding |
| The present invention is directed to a method of encoding a frame of input speech signal by ... |
|
| Electronic musical instrument with editing of tone data |
| It is therefore an object of the present invention to provide an electronic musical instrument ... |
|
| Fast significant sample detection for a pitch detector |
| FIG. 1 shows an illustrative maxima locator which is the focus of this invention. The maxima ... |
|
| Decoder for self-clocking serial data communications |
| To attain these and other objectives, at the receiving end of at least one serial data channel to ... |
|
| Power control method for a voltage controlled power amplifier and circuitry used in the method |
| I claim: 1. A method for controlling the rising and falling edges of an output pulse of a voltage ... |
|
|
Digital hearing aid and method
| Details |
Inventors: K/o/ pke, Wolfgang; Wiener, Peter; Maas, Rainer; Eggert, Albert; G/o/ tze, Gerd-Wolfgang;
Assignee: Robert Bosch GmbH (Stuttgart, DE)
Primary Examiner: Rubinson; G. Z.
Assistant Examiner: Schroeder; L. C.
Attorney, Agent or Firm: Frishauf, Holtz, Goodman & Woodward
To match the operation of a digital hearing aid directly to user requirements, and to reprogram the hearing aid as the hearing aid and/or user response characteristics change, a digital data processing element (12) processing digitized audio signals is connected to a programmable memory such as an EEPROM or an EARAM which stores predetermined frequency vs. amplitude transfer functions in accordance with user requirements or preference and/or hearing aid operation. Additionally, a memory (ROM 17) is provided storing a test program which causes the digital processor to generate test frequencies or tones at varying amplitudes, so that the transfer function in the programmable memory (15) can be changed or modified by operation of a switch (19) which can be manually user-operated or automatically, for example by measuring stapedius reflexes. After setting or changing the transfer function in the programmable memory (15), the normal program of the digital data processor--which can be of standard construction--is engaged by switch-over by a user-controlled transfer switch (18). |
|
DETAILED DESCRIPTION A microphone 10 is connected to an analog/digital (A/D) converter 11 to provide a digitized audio signal, derived from the microphone 10.
The A/D converter 11 is connected to a data processing apparatus, typically a microprocessor 12, the outputs of which are connected to a digital/analog (D/A) converter 13.
The D/A converter is connected to an earphone or earplug 14, forming an electro-audio transducer which projects audio waves into the ear of the user, for example a person having hearing problems.
A memory element 15 is connected to the microprocessor 12 by a two-way data bus.
In accordance with a feature of the invention, the memory 15 is a programmable memory, for example an electronically erasable programming read-only memory (EEPROM).
Further, a program memory 16 is provided which retains therein the hearing program; a second ROM 17 is provided for a test program.
The ROMs 16, 17 are connected by a data bus with the microprocessor 12.
Transfer of the normal operating program of the microprocessor 12 to a test program is effected by a transfer switch 18 which is user-controlled.
Of course, the ROMs 16, 17 can be incorporated within the same structure, for example a chip forming the microprocessor 12, or the respective programs retained within the ROM 16 and the ROM 17, can be placed in single ROM at respective addresses, the switch 18 then controlling addressing the respective addresses, for example by increasing or decrementing numbers representative of addresses.
The system further includes a switch 19, coupled to the microprocessor 12, to signal to the microprocessor when a predetermined amplitude/frequency relationship is obtained for which the memory 15 should be programmed or reprogrammed.
Switch 19 can be user-operated--if the test program is to be based on user operation; or it may be automatically operated, for example include a pressure sensing operated switch, introducible into the ear of the user and coupled to the eardrum.
Operation, with reference to FIG
|
|
Audio Signal Processing 
