KR850006756A - Simulation method and apparatus (electronic artificial head) that simulates the external ear transmission characteristics of a person exposed to sound in a free field - Google Patents

Abstract

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Description

Simulation method and apparatus (electronic artificial head) that simulates the external ear transmission characteristics of a person exposed to sound in a free field

As this is a public information case, the full text was not included.

1 is a very schematic block diagram of an outer ear simulation apparatus according to the present invention subdivided into direction dependent circuit elements and direction independent circuit elements.

Figures 2a-2b are functions of frequency, where (I) is the outer ear transfer curve in the free field simulated according to the present invention compared to the measured function (II), (1), (2), ( 3) the auditory effect parameter of the person, namely the auditory canal (curve 1), the rim formed by the shoulders and earlobe (curve 2), and the cave conchae (Curve 3) and the like.

3 is a detailed embodiment limited to the direction-dependent element for one channel in a simplified form (a single channel block diagram of the outer ear copying unit forming unit).

4 is a schematic diagram of one embodiment of the invention suitable for practical use in which the parameters of each circuit element are controlled by a microsystem using a geometrically characteristic magnitude of the memorized average.

5 is a detailed view of a possible embodiment of a voltage controlled low or high pass filter having a form to be used for realization of an electronic artificial head according to the present invention.

6 is a block diagram of an intermediate circuit for generating a control voltage for each circuit block to change a parameter of the present invention under the control of a microprocessor.

7 to 8 are free field extracorporeal transfer functions of test subjects with life in the free field (horizontal plane) for two different sound incidence angles, the solid line being calculated with the aid of the model realized by the present invention. The dotted line shows the function, and the dotted line is a schematic curve diagram showing the standard deviation of the measured number of measurements performed by the same test.

Claims (12)

In an electronic auditory method for simulated transfer characteristics that is consistent with non-human transfer characteristics when exposed to sound in a free field, the characteristics of the external transfer function that determine its structure are factors that affect each auditory Is determined for each element by a complex extraneous transfer function of magnitude and phase based on a model consisting of a head and an earlobe element, and thus a high pass filter, a low pass filter, a full band filter, a base cut filter, It is realized by the series and parallel connection of electrical circuit blocks, including resonance filters, adders, and time delays, where the partial model or some parameters of the model (time delay, cutoff frequency) for the analytical description of the external transfer function are If given physically, it is determined by the geometric size of the mean, and any direction of negative incidence By changing a part of the circuit of the electric circuit block configuration gajeok the parameter method of claim silhyeondoem continuously. In an external auditory simulation device or an electronic artificial head of a human ear, which has a transmission characteristic that matches the transmission characteristics of a human ear when exposed to sound in a free field, The physical auditory causes of the outer ear, head, upper part of the body, pinna rim, outer ear, middle ear, etc. are mathematically represented by a simple partial model. Apparatus characterized in that they are accessed in the form of electrical circuits containing circuit elements, such as filters, full-band filters, resonant systems, adders, time delay elements, etc., and additionally overlapping circuits or circuit blocks of the partial model. A circuit block and a circuit element are subdivided into a direction dependent portion (12) and a direction independent portion (13) connected thereto, wherein a time delay is taken from the direction dependent portion and proceeds with a basic time delay block (17). A device characterized in that its authority is assigned. 4. The circuit block according to claim 2 or 3, wherein each circuit block for the head portion 10a ', the ear portion 10b' and the shoulder and upper body portion 10c 'is each circuit element of a given number (high pass filter) 24b '), a low pass filter 24a, a band pass filter 24c, and a coefficient 24d. These elements are connected in series and in parallel with a given number according to a unique model in terms of form, and the result is an adder 15a (15b). 15c and 15d are connected to the output of each circuit element and supplied to the final adder, which is then connected to the circuit portion 16 composed of the ear canal and the carapaceous cavity. The circuit according to any one of claims 2 to 4, wherein each circuit element (high pass filter 24b, low pass filter 24a, band pass filter 24c, counting element 24d, time delay) is physically present. Determined by the geometric mean of a given average, characterized in that at least some of the circuit elements comprise means for changing parameters for the purpose of continuously producing an audio signal corresponding to any direction of negative incidence in the free field Device. Apparatus according to any one of claims 2 to 5, characterized in that the digital delay line is arranged to obtain a delay time (base time delay). 7. A method according to claim 6, wherein only one analog-to-digital converter 26 is provided for time-delayed digital formation from which the digitized and scanned magnitude of the analog input signal is read into the shift register and read-in. -in) and the time difference occurring between the read-outs having the scanned size at different memory locations defines each delay time. 8. Apparatus according to claim 6 or 7, characterized in that the shift register is a delay memory (27) which can be freely addressed. 9. A control circuit according to any one of claims 2 to 8, wherein a central control and a memory circuit (microprocessor system 18 ') are prepared to determine the relevant control parameters of each circuit element in each circuit block. Device into which the proposed direction of negative incidence is provided from outside for the determination of the parameter. 10. The microprocessor system 18 ′ according to claim 1, wherein the microprocessor system 18 ′ is connected to the central timing control 22 to determine the digitization processing of the supplied analog input signal and for seven hours in the delay storage element. The signal multiplexer 29 connected to the output terminal is determined in such a manner that a time difference for delay occurrence is determined, signal reactivity is determined, and a time delay associated with each channel 24 of an analog circuit portion composed of a circuit element is generated. Apparatus characterized by passing the current. Apparatus according to any one of claims 2 to 10, characterized in that a voltage controlled low pass or high pass filter having an adjustable cutoff frequency fg is prepared and supplied with a control voltage to change the transfer characteristics. . 12. A device according to claims 2 to 11, in which a device controlled by the microprocessor 18 'is prepared for generating a control voltage to be supplied to each circuit element to determine a parameter, the device having an address. ) And data registers (43) (40), the resulting digital-to-analog converter (4) and multiplexer are controlled by the address register (43) and are assigned to each electrical circuit element. Device for outputting an output voltage of ※ Note: The disclosure is based on the initial application.