BRUEL & KJAER HF HATS 5128 User Manual
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BRUEL & KJAER HF HATS 5128 User Manual

Handset positioner and high-frequency head and torso simulator
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USER MANUAL
High-frequency Head and Torso Simulator
(HF HATS) Type 5128
Handset Positioner for HATS Type 4606
BE 1909 – 14
English

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Summary of Contents for BRUEL & KJAER HF HATS 5128

  • Page 1 USER MANUAL High-frequency Head and Torso Simulator (HF HATS) Type 5128 Handset Positioner for HATS Type 4606 BE 1909 – 14 English...
  • Page 3 High-frequency Head and Torso Simulator (HF HATS) Type 5128 Handset Positioner for HATS Type 4606 User Manual BE 1909 – 14 December 2019 www.bksv.com...
  • Page 4 Health and Safety Considerations Electrical Hazards This apparatus has been designed and tested in accordance Warning: Any adjustment, maintenance and Safety with IEC/EN 61010 – 1 ANSI/UL 61010 – 1 repair of the open apparatus under voltage must Requirements for Electrical Equipment for Measurement, be avoided as far as possible and, if unavoidable, Control and Laboratory Use .
  • Page 6 Brüel & Kjær has made every effort to ensure the accuracy of Brüel & Kjær and all other trademarks, service marks, trade the information contained in this document. No responsibility names, logos and product names are the property of is accepted for any errors or omissions herein. It is the Brüel &...

  • Page 7: Table Of Contents

    Contents CHAPTER 1 Introduction..........................1 About this Manual ........................1 HF HATS Types 5128-C and 5128-D ..................1 Tabletop HATS Type 5128-B ..................... 1 Mouth Simulator........................1 Ear Simulator Types 4620-L and 4620-R ................... 2 Accessories for all HF HATS Types .................... 3 CHAPTER 2 Operation ..........................
  • Page 8 Specifications Tabletop HATS Type 5128-B ................48 Specifications HF HATS Types 5128-C and 5128-D ..............48 APPENDIX A Literature References ......................49 APPENDIX B Glossary..........................51 INDEX ................................55...

  • Page 9: Introduction

    Chapter 1 Introduction About this Manual This manual covers the operation of High-frequency Head and Torso Simulator (HF HATS) Types 5128-C and 5128-D, Tabletop HATS Type 5128-B, and all their accessories. It also includes the associated Right Ear Simulator Type 4620-R, and Left Ear Simulator Type 4620-L. For a description of the features and functions of Handset Positioner Type 4606 (included with Type 5128-D), see Chapter 4.

  • Page 10: Ear Simulator Types 4620-L And 4620-R

    High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Type 5128 is equipped with chin clip that will hold a 1/4 reference microphone at precisely the correct distance for calibration at the MRP. This chin clip can also hold a microphone at the opening of the mouth to monitor or equalise the sound pressure at this point.

  • Page 11: Accessories For All Hf Hats Types

    CHAPTER 1 Introduction Accessories for all HF HATS Types Fig.1.1 Accessories included with all HF HATS Types: (1) Calibrator Adapter DI-0658; (2) Data Disk for HATS BC-5009 Additional accessories included with HF HATS Types 5128-C/D:  (3) Microphone Holder UI-0209 (for 7 mm wide 1/4 microphone);...
  • Page 12 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual  Fig.1.2 Optional accessories for Type 5128: (1) Sound Calibrator Type 4231; (2) Adapter for 1/4 Microphone   DP-0775; (3) Pressure-field 1/4 Microphone Type 4944-A; (4) Feet UA-1043 (incl. 4 3 mm bolts and rubber spacers);...

  • Page 13: Operation

    Chapter 2 Operation Assembling HF HATS Types 5128-C and 5128-D HF HATS Types 5128-C and 5128-D can be used free-standing, or supported on a tripod using adapter UC-5290 (Fig.1.2). The adapter screws onto the top of a tripod. The torso can then be fitted onto it and secured by tightening the locking nut.

  • Page 14: Calibration Of The Mouth Simulator

    High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual The mouth simulator is equipped with a protection circuit to prevent damage to the unit, CAUTION: and even though this protection circuit is present, there may be a risk of damaging the mouth simulator by excessive input voltage.
  • Page 15 CHAPTER 2 Operation Fig.2.3  microphone with preamplifier in the holder that positions them at the MRP, 25 mm from the equivalent lip plane (Type 4128-C/D shown) Some 1/4 microphones (for example, Brüel & Kjær Type 4938, which is 6.25 mm wide) require that adapter DI-1058 is mounted in the microphone holder, see Fig.2.4 Fig.2.4 Microphone holder...

  • Page 16: Ear Simulators

    High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual • By using post-processing of the excitation signal provided to the mouth simulator. Caution should be taken to ensure that the required sound pressure level is actually produced. See, for example, ITU-T Rec.P.581 •...

  • Page 17: Calibration Of The Ear Simulator

    CHAPTER 2 Operation Calibration of the Ear Simulator Prior to calibrating the ear simulator, the associated connector ‘Right ear’ or ‘Left ear’ shall be connected to an audio analyzer, see Fig.2.2. The ear simulator is equipped with a pre-polarized microphone, hence no external polarization voltage is required. Each ear simulator can be calibrated using the Sound Calibrator Type 4231.
  • Page 18 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Fig.2.6 Calibration of the ear simulator (on Type 5128-B/C/D)
  • Page 19 CHAPTER 2 Operation 7) Switch the calibrator off. 8) Remove the calibrator from the adapter. 9) Remove the calibrator adapter DI-0658 from the coupler by unscrewing the nut. 10) Attach the coupler to the ear simulator by tightening up the nut. Be careful not to damage the thread of the nut on the coupler or the ear canal.
  • Page 20 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual 2.5.2 Positioning Aids on HF HATS – Types 5128-C/D Only Fig.2.8 shows the positions of threaded fixing holes (all M3-threaded) which are provided at various locations on HF HATS. These allow attachment of user-designed support structures for the devices under test, if required.
  • Page 21 CHAPTER 2 Operation On the data disk, files with the file extension bkm and bkt hold data in a format that is optimised for use with various Brüel & Kjær software products. These files can be viewed by using programs ®...
  • Page 22 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Table 2.2 (Continued) Details of the files supplied on data disk with Type 5128-C-110 (with left and right ear simulators, but without a mouth simulator) and Type 5128-C-111 (with left and right ear simulators and mouth simulator) File Name Contents Freq.
  • Page 23 CHAPTER 2 Operation Fig.2.9 The elevation angles of +90˚ El. +75˚ sound incidence to El. +60˚ which files on the data El. +45˚ disk refer (see Table 2.2 and Fig.2.10) El. +30˚ El. +15˚ Elevation 0˚ El. –15˚ El. –30˚ El.
  • Page 24 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Table 2.3 lists the measurement points as specified in ITU-T Rec. P.51, which deals with a rotationally symmetrical artificial mouth and not a HATS, so care should be taken when comparing different sets of results of measurements at these points.

  • Page 25: Assembling Tabletop Hats Type 5128-B

    CHAPTER 2 Operation Assembling Tabletop HATS Type 5128-B 2.6.1 Introduction Tabletop HATS Type 5128-B consists of a head mounted on a support foot and can be used free- standing or placed on a tripod. The head can be configured with a pair of ear simulators, or optionally, a mouth simulator, see Fig.2.11.

  • Page 26: Disassembling Hf Hats Type 5128

    High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Fig.2.12 Connecting Tabletop HATS Type 5128-B 2.6.3 Calibration of Tabletop HATS Before Tabletop HATS Type 5128-B can be used for measurements of headphones, for example, the calibration procedure described in Section 2.5, should be performed. If Tabletop HATS is equipped with a mouth simulator the calibration procedure described in Section 2.3 should be performed prior to performing measurements on headsets, for example.

  • Page 27: Characteristics

    Chapter 3 Characteristics Construction of HATS 3.1.1 Head and Torso Construction The shell of HF HATS Types 5128-C/D is made up of two parts: the torso, which is in one piece and cannot be dismantled, and the head. The head cap can be removed, but is not intended to be dismantled.

  • Page 28: Mouth Simulator Operating Characteristics

    High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual The loudspeaker has a maximum voltage rating for continuous operation of 0.7 V . To reduce the risk of damage, the drive to the loudspeaker is limited by a protection circuit mounted in the head of Type 5128.
  • Page 29 CHAPTER 3 Characteristics Fig.3.2 Typical free-field TFR of Type 5128-C (100 Hz – 20 kHz) 1000 10000 Frequency (Hz) 990062/2 3.2.2 Normalized Free-field Response Distribution The sound-pressure level distribution around the mouth of Type 5128 for “whole speech” is shown in Fig.3.3; it closely follows the distribution around the human mouth. The measurement was made with the mouth insert in place.
  • Page 30 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Fig.3.3 The sound pressure level distribution around the mouth opening with the mouth insert in place (average from 300 Hz V e rtic a l P la n e H o riz o n ta l P la n e to 3.3 kHz) 6 0m m8 0...

  • Page 31: Ear Simulator Operating Characteristics

    CHAPTER 3 Characteristics 3.2.3 Harmonic Distortion Fig.3.4 shows typical second-harmonic and third-harmonic distortion of the mouth simulator. 3.2.4 Overload Protection The mouth simulator of Type 5128 has a built-in overload protection circuit, which will trigger automatically if the drive signal applied to the loudspeaker is too great, or remains on for too long.
  • Page 32 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Fig.3.5 Typical listener free-field frequency response curves (L and R) for High-frequency HATS (20 Hz – 20 kHz) LFR L and LFR R −5 −10 −15 −20 2000 20 000 Frequency (Hz) 180027...
  • Page 33 CHAPTER 3 Characteristics Fig.3.6 Typical listener diffuse-field frequency response (DFR) curve for High-frequency HATS (20 Hz – 20 kHz) Diffuse-field Response −5 −10 −15 −20 2000 20 000 Frequency (Hz) 990226/1 3.3.3 Listener Free-field Frequency Responses The frequency response of HATS to on- and off-axis sound in the free-field is illustrated in Fig.3.7 to Fig.3.10.
  • Page 34 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Fig.3.8 Off-axis response of Type 5128-C (90) in the free-field LFR 90 deg L (20 Hz – 20 kHz) LFR 90 deg R 2000 20 000 Frequency (Hz) 180063 Fig.3.9 Off-axis response of...
  • Page 35 CHAPTER 3 Characteristics 3.3.4 Transfer Impedance The transfer impedance is measured by driving the simulator at its input reference plane by a known acoustic volume velocity and then measuring the output of the ear simulator microphone. Fig.3.11 Magnitude of the ear simulator transfer impedance times frequency relative to the value at 500 Hz Transfer Impedance −5 −10...
  • Page 36 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Fig.3.12 The sidetone characteristic of Type 5128-C for both an open and closed ear (100 Hz – 20 kHz) −10 −20 −30 −40 Sidetone Open Ear Sidetone Closed Ear −50 −60 −70...

  • Page 37: Handset Positioner For Hats Type 4606 – Main Components

    Chapter 4 Handset Positioner for HATS Type 4606 Features and Functions Handset Positioner for HATS Type 4606 – Main Components Handset Positioner for HATS Type 4606 consists of three main components: The Cradle, the Cradle Positioner Assembly, the Mounting Bracket and the Alignment Jig. Fig.4.1 (1) Cradle UA-1541 (2) Cradle Positioner...
  • Page 38 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual The positioner has laser-etched graduations, making positions easy to recreate; a special table is provided in section 4.3 for this purpose. Fig.4.2 Type 4606 mounted on Type 5128-C Type 4606 allows measurement in both standardized and non-standardized positions.

  • Page 39: Handset Positioner For Hats Type 4606 Features And Functions

    CHAPTER 4 Handset Positioner for HATS Type 4606 Features and Functions 4.1.2 The Cradle The cradle is used for firmly holding and positioning handsets of almost any shape. The cradle then attaches to the rest of the handset positioner for HATS, accurately positioning the handset. The cradle is crafted from machined aluminium and stainless-steel parts for accuracy and durability.
  • Page 40 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual The handset’s ECRP is directly over the front support when the handset is correctly mounted in the cradle. The rear support can be positioned in any one of the five sockets available for the centering forks and is held in place with a knurled locking ring.
  • Page 41 CHAPTER 4 Handset Positioner for HATS Type 4606 Features and Functions Centering forks: • Use UA-1537 for handset widths ranging from 26 to 66 mm. • Use UA-1587 for handset widths ranging from 26 to 92 mm. Fig.4.6 The two centering fork variants: UA-1537 (top) and UA-1587 (bottom)
  • Page 42 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual 4.1.3 Cradle Positioner Assembly Fig.4.7 Barrel Cradle positioner assembly, consisting of Applied force scale (N) the barrel and the arm Locking collar Adjustment sleeve ERP-axis displacement scale (mm) ‘...
  • Page 43 CHAPTER 4 Handset Positioner for HATS Type 4606 Features and Functions 4.1.4 Mounting Bracket The mounting bracket sits on the head of HATS and positions the cradle positioner assembly accurately. This is accomplished using two sets of four alignment pins: one for positioning the mounting bracket on HATS, and the other for positioning the cradle positioner assembly on the mounting bracket.

  • Page 44: Using Handset Positioner For Hats Type 4606

    High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Using Handset Positioner for HATS Type 4606 4.2.1 Attaching the Cradle Positioner Assembly to HATS Mounting Bracket UA-1534 is attached to the head of HATS as follows: 1) Attach the four alignment pins (UA-4132) to the underside of the mounting bracket (see Fig.4.9).Tighten the pins from the top side of the bracket, sliding the cradle positioner mount as necessary to gain access.
  • Page 45 CHAPTER 4 Handset Positioner for HATS Type 4606 Features and Functions Fig.4.9 Attaching the cradle positioner...
  • Page 46 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual 4.2.2 Mounting a Handset in the Cradle Fig.4.10 The cradle mounted in the alignment jig with a handset For the given handset, make sure that the centering forks are placed in suitable holes in the cradle bar.
  • Page 47 CHAPTER 4 Handset Positioner for HATS Type 4606 Features and Functions 9) Adjust the end stop until it just touches the edge of the handset. 10) Rotate the centering forks to angles that do not interfere with buttons on the side of the handset or project much above the top side of the handset (this is to prevent them from fouling the cheek of HATS when mounting the cradle on the cradle positioner assembly).
  • Page 48 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Fig.4.11 Applying the cradle, and adjusting the angles, position and application force. Rotation in Three Planes All three adjustment angles (A, B and C) rotate about the handset ECRP point. B and C, in contrast to A, allow handset motion in only one plane at a time.

  • Page 49: Handset Positioner Table And Standardized Measurements

    CHAPTER 4 Handset Positioner for HATS Type 4606 Features and Functions Handset Positioner Table and Standardized Measurements The table in Fig.4.12 has been developed to provide a convenient means of noting down all measurement parameters to make repeatable measurements and to set up Type 4606 for standardized measurements according to ITU-T Rec.
  • Page 50 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Fig.4.12 Handset Positioner Table Serial Number: Telephone Handset Type: Operator: Date: Support Foot Front Rear Height [mm] Offset [–5 to 5] Centering Fork Socket position Front Rear [1–5] Offset [mm] End Stop Spike...
  • Page 51 CHAPTER 4 Handset Positioner for HATS Type 4606 Features and Functions 4.3.4 Position  A is measured off the end of the slide on the mounting bracket.  B and  C are recorded to the nearest ½° using the markings provided on the swivel joints. In general the positioning accuracy of Type 4606 when mounted on Type 5128 is ±...
  • Page 52 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual The Standard Handset Position For the standard handset position, according to ITU-T Rec. P.64 Annex E.1, the settings of the three angles are clearly marked on the handset positioner by an ‘H’ at  A,  B and  C and by ‘ERP’...

  • Page 53: Service And Repair Of Type 5128

    Chapter 5 Service and Repair of Type 5128 HF HATS Type 5128 has been designed to provide many years of reliable operation and, under normal use, there should be no significant deviation from the stated specifications. However, if a fault occurs, disconnect HF HATS from all external instruments and consult your local Brüel &...
  • Page 54 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual...

  • Page 55: Specifications

    Chapter 6 Specifications Compliance with Standards Type 5128 The CE marking is the manufacturer’s declaration that the product meets the requirements of the applicable EU directives RCM mark indicates compliance with applicable ACMA technical standards – that is, for telecommunications, radio communications, EMC and EME China RoHS mark indicates compliance with administrative measures on the control of pollution caused by electronic information products according to the Ministry of Information Industries of the People’s Republic of China...

  • Page 56: Specifications Tabletop Hats Type 5128-B

    High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Specifications Tabletop HATS Type 5128-B LISTENER FREQUENCY RESPONSE PINNA SIMULATORS Based on specifications in ITU-T Rec. P.58, IEC 60318–7 and Dimensions comply with ITU-T Rec. P.58, IEC 60318 – 7 and ANSI S3.36–1985 ANSI S3.36.

  • Page 57: Literature References

    Appendix A Literature References ANSI S3.25-1979 Occluded Ear Simulator ANSI S3.25-1985 Methods of measurements of performance characteristics of hearing aids under simulated in-situ working conditions ANSI S3.36-1985 Specification for a manikin for simulated in-situ airborne acoustic measurements BE 0940 Instruction manual for Brüel & Kjær Mouth Simulator Type 4227 HUMANSCALETM 1/2/3 (1978) N.
  • Page 58 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual...

  • Page 59: Glossary

    Appendix B Glossary The measurement unit for expressing the relative intensity of sound. A direct Decibel (dB) application of linear scales (in Pa) to the measurement of sound pressure leads to large and unwieldy numbers. As the ear responds logarithmically rather than linearly to stimuli, it is more practical to express acoustic parameters as a logarithmic ratio of the measured value to a reference value.
  • Page 60 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Diffuse-field frequency response. The difference, in dB, between the third-octave spectrum level of the acoustic pressure at the ear-drum reference point (DRP) and the third-octave spectrum level of the acoustic pressure at the HATS reference point (HRP) in a diffuse sound field with the HATS absent.
  • Page 61 APPENDIX B Glossary The sound pressure measured by the ear simulator is referenced to the ear-drum EEP-DRP reference point (DRP). The transfer function provided on the data disk will be used for converting data to the ear canal entrance point (EEP), when it is required to compare results with specifications based on measurements referred to EEP.
  • Page 62 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual Mouth Reference Point. The point on the reference axis, 25 mm in front of the lip plane. The reference axis is the line perpendicular to the lip plane containing the centre of the lip (CL).

  • Page 63: Index

    Index Numerics centering forks ..........32 Major Components .........31 1/4 inch Microphone Type 4938 ......7 Mounting a Telephone Handset ......38 1/4 inch Microphone with Preamplifier sockets .............31 Type 4944 ............6 spikes ...............31 4620-L and 4620-R ........... 2 Cradle Positioner Assembly ........34 Cradle positioner assembly adjustment mechanism ........34 About this Manual ...........
  • Page 64 Data Table ............41 End Stop ............41 Overload Protection ..........23 Position Readoff ..........43 Rotation in Three Planes ........ 40 Standardized Positions ........43 Positioning Aids on HF HATS Support Foot ........... 41 (Types 5128-C/D Only) ........12 Handset Positioner for HATS Type 4606 Positioning Terminology ........
  • Page 65 Using Handset Positioner for HATS Type 4606 ..........36 UA-1043 ..............5 Utilizing the Mouth Simulator ........5 UA-2180 Tabletop HATS Support Foot ....17...
  • Page 68 © Brüel & Kjær. All rights reserved. www.bksv.com...

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