BRUEL & KJAER 4128-C User Manual
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BRUEL & KJAER 4128-C User Manual

Head and torso simulator, handset positioner for hats
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Technical
Documentation
Head and Torso Simulator (HATS)
Type 4128-C
Handset Positioner for HATS Type 4606
User Manual
English BE 1617 – 13

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Summary of Contents for BRUEL & KJAER 4128-C

  • Page 1 Technical Documentation Head and Torso Simulator (HATS) Type 4128-C Handset Positioner for HATS Type 4606 User Manual English BE 1617 – 13...
  • Page 3 Head and Torso Simulator (HATS) Type 4128-C Handset Positioner for HATS Type 4606 User Manual March 2010 BE 1617 – 13...
  • Page 4 Safety Considerations This apparatus has been designed and tested in accordance with IEC/EN 61010 – 1 and ANSI/ UL 61010 – 1, Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use. This manual contains information and warnings which must be followed to ensure safe operation and to retain the apparatus in safe condition.

  • Page 5: Table Of Contents

    Table of Contents Introduction......................1 Head and Torso Simulator Type 4128-C ............. 1 Handset Positioner for HATS Type 4606............. 2 Part I: HATS Type 4128-C CHAPTER 1 Operation......................7 Accessories Supplied with Type 4128-C ............. 7 Mounting Type 4128-C ..................8 The Mouth Simulator....................
  • Page 6 CHAPTER 7 Specifications ....................57 Compliance with Standards 4128-C and 4128-D..........57 Specifications Type 4128-C and 4128-D ............58 APPENDIX A Literature References..................61 Index............................63...

  • Page 7: Introduction

    The usual calibration position is at the ITU-T Mouth Reference Point (MRP), 25 mm in front of this plane. A chin clip is supplied with Type 4128-C that will hold a 1/4 reference microphone at precisely the correct distance for calibration at the MRP.

  • Page 8: Handset Positioner For Hats Type 4606

    The ear simulator complies with ITU-T Rec. P.57. Type 4158-C is the right ear of Type 4128-C. A left ear, Type 4159-C, is also available for binaural measurements. Both Type 4158-C and Type 4159-C are delivered with a calibration CD and chart specific to their ear simulator and pinna.
  • Page 9 Introduction For exploring the effect of asymmetrically mounted transducers and simulating left- and right- handed users, it is possible to perform measurements on both ears. This is done by reversing the position of the Cradle Positioner, with all graduations of the adjustment screws being repeated for the left-hand position.
  • Page 10 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual...

  • Page 11: Part I: Hats Type 4128-C

    Part I HATS Type 4128-C...

  • Page 13: Chapter 1 Operation

    Accessories Supplied with Type 4128-C Fig.1.1 The accessories supplied with Type 4128-C: (1) 3 mm Allen key QX-1172; (2) and (4) Feet UA-1043; (3) Ear Mounting Tool QA-0167; (5) Ear Mould Simulators DB-2902 (short) and UC-0199 (long); (6) Calibration CD BC 5000-C; (7) Right Pinna, soft DZ-9769; (8) Left Pinna, soft DZ-9770;...

  • Page 14: Mounting Type 4128-C

    HATS with Feet UA-1043 attached The head of Type 4128-C can be separated from the torso and used on its own, mounted on a tripod using the mounting thread in the neck. This is only recommended for applications where there is a very close acoustical coupling between the object under test and the mouth or the ear, as it is only in these circumstances that the contribution of the torso to the acoustical properties of Type 4128-C can be ignored.

  • Page 15: Calibration Of The Mouth Simulator

    For this purpose, Type 4128-C has a microphone holder which positions a l/4 microphone with preamplifier (e.g., Brüel & Kjær Type 4939 or previously Type 4135 with Preamplifier Type 2670) at the MRP (see Fig.1.3).

  • Page 16: The Ear Simulator

    Type 4128-C, this part of the ear-canal must not be allowed to influence measurements.
  • Page 17 CHAPTER 1 Operation Since the ear-canal extension of the HATS is made of pliant silicone rubber, it can accommodate some actual ear-moulds from ITE, BTE, and canal hearing-aids without the need for ear-mould simulators. Fig.1.4 Ear Simulator Angle Adaptor Cross-section of the head Ear Simulator with 1/2"...
  • Page 18 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual Fig.1.5 Mounting the ear simulator (steps 5 through 8)

  • Page 19: Calibration Of The Ear Simulator

    97.1 dB Type 4231 a. Supplied with Head and Torso Simulator Type 4128-C b. Supplied with Pistonphone Type 4228 c. “Stated SPL” is the sound pressure level stated on the calibration chart (BC 0195) of Type 4228. The nominal SPL of Type 4228 is 124 dB “L...
  • Page 20 The SPL values in the table differ from those given in the instruction manuals for the calibrator. This is because the calibration coupler influences the actual sound pressure level at the microphone diaphragm, and the coupler used for calibration of Type 4128-C is different to that normally used for microphone calibration.
  • Page 21 CHAPTER 1 Operation Fig.1.6 Bolts to be removed to split the head (remove from both sides of the head) Rear bolts 1.6.2 Fixing Holes of the Head and Torso Simulator Threaded fixing holes are provided at various locations on the HATS. These allow attachment of user-designed support structures for the devices under test if required.
  • Page 22 1.6.3 Calibration CD Each Type 4128-C comes with a CD containing calibration data both in ASCII format and for use with Brüel & Kjær PULSE Audio Analyzer. The CD contains calibration measurements for the mouth simulator and the right ear simulator (Type 4158-C) of Type 4128-C-001 and, for Type 4128-C-002, also for the left ear simulator (Type 4159-C).
  • Page 23 CHAPTER 1 Operation Table 1.2 Details of the files on the CD supplied with Type 4128-C. The CD supplied with Type 4159-C includes LFR_L (the left ear listener frequency response) instead of LFR_R Frequency File Name Contents Comments Range Listener Diffuse-field Frequency 20Hz –...
  • Page 24 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual Table 1.2 (cont.) Details of the files on the CD supplied with Type 4128-C. The CD supplied with Type 4159-C includes LFR_L (the left ear listener frequency response) instead of LFR_R...
  • Page 25 CHAPTER 1 Operation Fig.1.8 90˚ L_000_90 The elevation angles of L_xxx_60 sound incidence to which files on the calibration CD refer (see Table 1.2 and Fig.1.11) L_xxx_30 L_xxx_00 0˚ L_xxx-30 L_xxx-60 L_000-90 -90˚ 990095 Fig.1.9 90˚ The azimuth angles of sound incidence for which measurements are given in each of the files given in...
  • Page 26 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual Fig.1.10 90˚ The elevation angles of sound incidence to which files on the calibration CD L_xxx_45 refer (see Table 1.2 and Fig.1.9) L_xxx_30 L_xxx_15 0˚ L_xxx_00 L_xxx-15 L_xxx-30 L_xxx-45 -90˚...
  • Page 27 CHAPTER 1 Operation Table 1.3 lists the measurement points used for the measurements in files MNFF-01 to MNFF- 20 on the CD. These are 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 28 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual...

  • Page 29: Chapter 2 Characteristics

    Head and Torso Construction The shell of Head and Torso Simulator Type 4128-C is made up of three parts: the torso, which is in one moulded piece and cannot be dismantled, and the two halves of the head (front and back).

  • Page 30: Mouth Simulator Operating Characteristics

    10 W. To reduce the risk of damage, the drive to the loudspeaker is limited by a protection circuit mounted in the head of Type 4128-C. The mouth opening of Type 4128-C has a removable adaptor SO-0007 which allows a choice of orifice size (30  11 mm or 42 ...
  • Page 31 990062/1 Normalised Free-field Response Distribution The sound-pressure level distribution around the mouth of Type 4128-C is shown in Fig.2.3 for “whole speech”; it closely follows that found around the human mouth. The measurement was made with the mouth insert in place.
  • Page 32 Fig.2.4 shows typical second-harmonic and third-harmonic distortion of the mouth simulator. Overload Protection The mouth simulator of Type 4128-C 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 33: Ear Simulator Operating Characteristics

    Frequency Response (MFR) (particularly in connection with hearing aids), and free-field frequency response. Fig.2.6 shows a typical LFR for sound incident at 0  for Type 4128-C, with the ear simulator in the right ear. The LFR is the overall frequency response from the free-field to the eardrum and includes the effects of the head, torso, pinna, ear-canal and ear simulator.
  • Page 34 If measurements are to be made using both ears at the same time, then the matching between the left and right ears of Type 4128-C will be a combination of the tolerances on the pinnae (as given in the specifications), and the tolerances on the ear simulators fitted, as given in the IEC 60318–4 standard with which the ear simulators comply.
  • Page 35 Fig.2.10. These measurements were made using Brüel & Kjær PULSE Audio Analyzer, with an ear simulator fitted in the right ear of Type 4128-C. 0  corresponds to sound incident on the face of Type 4128-C, and 90  to sound incident on the right ear. More off-axis curves can be found on the calibration CD.
  • Page 36 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual Fig.2.9 Off-axis response of Type 4128-C (180) in the free-field (20 Hz – 20 kHz) Angle of incidence = 180 Frequency (Hz) 990230 Fig.2.10 Off-axis response of Type 4128-C (270) in the free-field (20 Hz –...
  • Page 37 CHAPTER 2 Characteristics Fig.2.11 Magnitude of the ear simulator transfer impedance times frequency relative to the value at 500 Hz Transfer impedance IEC tolerance curves 100k Frequency (Hz) 990232 2.3.2 General Operating Characteristics Sidetone The mouth-ear sidetone characteristic of the HATS (i.e., the influence of the mouth simulator output on the ear simulator output) is shown in Fig.2.12 for both an open and a closed ear.
  • Page 38 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual Fig.2.12 The sidetone characteristic of Type 4128-C for both an open and closed ear (100 Hz – 20 kHz) Closed ear Open ear -100 Frequency (Hz) 100k 990225...

  • Page 39: Service And Repair Of Type 4128-C

    Chapter 3 Service and Repair of Type 4128-C Head and Torso Simulator Type 4128-C 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 the HATS from all external instruments and consult your local Brüel &...
  • Page 40 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual...

  • Page 41: Part Ii: Handset Positioner For Hats Type 4606

    Part II Handset Positioner for HATS Type 4606...

  • Page 43: Type 4606 Features And Functions

    Chapter 4 Type 4606 Features and Functions Operational Parts of Type 4606 Fig.4.1 Main components of Type 4606. (1) Alignment Jig UA-1535; (2) Cradle Positioner Assembly UA-1542; (3) Mounting Bracket UA-1534; (4) Cradle UA-1541...
  • Page 44 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual Type 4606 has been developed expressly for use with Types 4128 and 4128-C HATS and bolts directly to the top of the head of the HATS. Type 4606 positions most types of telephone handset for measurements.
  • Page 45 CHAPTER 4 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 locating the handset. The cradle is crafted from precision, CNC machined aluminium and stainless steel parts for accuracy and durability.
  • Page 46 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual sockets are shaped to prevent the centering fork being mounted in a reversed position, which would change the direction in which the centering mechanism functioned. The supports help to position the handset under test before it is clamped in place with the forks.
  • Page 47 CHAPTER 4 Type 4606 Features and Functions The cradle positioner provides much of the adjustment flexibility of the handset positioner. It consists of the barrel (see Fig.4.5), which bolts onto the mounting bracket (see Fig.4.6), and the arm, which contains two single-plane swivel joints with graduations (see Fig.4.4). The barrel provides adjustment parallel to the ERP axis (formed by the ERPs of the left and right ears of HATS).

  • Page 48: Mounting And Calibration (Right Ear)

    HATS Type 4128-C, Handset Positioner Type 4606 – User Manual Fig.4.6 HATS head with mounting bracket 4.1.5 Alignment Jig To position the telephone handset correctly within the handset positioner cradle, an alignment jig is supplied (see Fig.4.1). This table top instrument allows you to accurately fix the position of the telephone handset’s ECRP and then position the handset in the cradle so that the...
  • Page 49 1) Remove the rubber pinna by sliding it forward (towards the face of HATS) and then pull outwards at the rear of the pinna. 2) Using Ear Mounting Tool QA-0167 (Fig.1.1.3) supplied with Type 4128-C, loosen and remove Microphone Retaining Collar DB-3021 (Fig.4.8.1).
  • Page 50 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual Fig.4.8 Mounting the handset positioner correctly on HATS...
  • Page 51 CHAPTER 4 Type 4606 Features and Functions B on the cradle positioner joint to 0  and lock it with the locking knob (see  10) Set Fig.4.9.8). C on the other joint to –10  without locking it and fit the socket for the cradle onto ...
  • Page 52 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual Fig.4.9 Mounting the handset positioner correctly on HATS...
  • Page 53 CHAPTER 4 Type 4606 Features and Functions 4.2.1 Mounting a Telephone Handset correctly in the Cradle Fig.4.10 The cradle mounted in the alignment jig prior to fitting a telephone handset For the given handset, make sure that the centering forks are placed in suitable holes in the cradle bar.
  • Page 54 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual 9) 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 55: Handset Positioner Table And Standardised Measurements

    CHAPTER 4 Type 4606 Features and Functions  B and  C are both adjusted via the joints on the handset positioner assembly and, in contrast to  A, allow handset motion in only one plane at a time. Adjusting  B rotates the handset about an axis perpendicular to the normal of the ear-cap plane and the line of intersection of the handset symmetry plane with the ear-cap plane.
  • Page 56 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual Fig.4.11 Handset Positioner Table Serial Number: Telephone Handset Type: Operator: Date: Support Foot Front Rear Height [mm] Centering Fork Offset [–5 to 5] Front Rear Socket position Offset [mm] [1–5]...
  • Page 57 CHAPTER 4 Type 4606 Features and Functions 4.3.4 Position  B and  C are recorded to the nearest ½ using the markings provided on the swivel joints.  A is measured off the end of the slide on the mounting bracket. 4.3.5 Standardised Measurements Type 4606 is easy to set up for standardised measurements according to ITU-T Rec.
  • Page 58 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual The Standard Handset/HATS Position According to ITU-T Rec. P.64 Annex E.1 For the standard handset position, the settings of the three angles are clearly marked on the handset positioner by an “H” at  A,  B and  C and by “ERP” on the mm scale on the handset positioner barrel (the ERP-axis).

  • Page 59: Use With Telephone Test Systems

    Chapter 5 Use With Telephone Test Systems Brüel & Kjær offers a wide range of telephone systems for acoustical measurements on telephone equipment, including hand-held telephones, hands-free telephones and headsets. The ear and mouth simulator are operational in full duplex for realistic testing. Measurements can be made using the dedicated Voice Testing System for Mobile Phones Type 6712 enabling reliable and realistic OTA measurements for cellular phones including GSM, UMTS, CDMA, and W-CDMA.
  • Page 60 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual...

  • Page 61: Service And Repair Of Type 4606

    Chapter 6 Service and Repair of Type 4606 With normal usage your Type 4606 should not require any elaborate maintenance. However, it is important to remember that Type 4606 is a precision instrument and must be treated accordingly. Storage Type 4606 should be stored in a clean dry environment in its box or mounted on a HATS. The rubber O-rings that form the grips should be checked for cracks before use.
  • Page 62 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual...

  • Page 63: Chapter 7 Specifications

    Chapter 7 Specifications Compliance with Standards 4128-C and 4128-D CE-mark indicates compliance with: EMC Directive and Low Voltage Directive. C-Tick mark indicates compliance with the EMC requirements of Australia and New Zealand EN/IEC 61010–1: Safety requirements for electrical equipment for measurement, control and laboratory use.

  • Page 64: Specifications Type 4128-C And 4128-D

    HATS Type 4128-C, Handset Positioner Type 4606 – User Manual Specifications Type 4128-C and 4128-D LISTENER FREQUENCY RESPONSE Sound Pressure Distribution: conforms to ITU-T Conforms to ITU-T Rec. P.58 for measurements on Rec. P.58 Mouth Opening: W  H: 30  11 mm (1.18  0.43) telecommunications devices and to IEC60318–7 and...
  • Page 65 CHAPTER 7 Specifications Specifications Type 4606 SPEAKING POSITION OFFSET ADJUSTMENT Standardised position: HATS position as defined in For asymmetrical handset the offset perpendicular to ITU-T Rec. P.64 A = 21.2, B = 12.9, C = 2.3 the handset can be adjusted in the range ± half the Variable positions: handset width minus 8 mm.
  • Page 66 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual...

  • Page 67: 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 ITU-T Rec. P.50 Artificial voices ITU-T Rec.
  • Page 68 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual...

  • Page 69: Index

    Index left pinna..............7 mounting the ear simulator and preamplifier ..11 Adaptor mounting tool..........7, 11 calibration adaptor ..........7 occluded ear simulator ........24 Alignment jig ............. 42 pinna-simulator............ 10 right pinna.............. 7 Binaural simulator.............. 10 measurements ............2 simulator construction .........
  • Page 70 HATS Type 4128-C, Handset Positioner Type 4606 – User Manual mouth simulator operating characteristics... 24 simulator............8, 9 Service and Repair loudspeaker............8 HATS ..............33 Type 4606 ............55 Sidetones ..............31 Normalised Free-field Response Distribution... 25 Talker Frequency Response........24 Off-axis Listener Free-field Frequency Responses .. 28 Telephone Test Head Type 4602 B ......3...
  • Page 72 HEADQUARTERS: Brüel & Kjær Sound & Vibration Measurement A/S · DK-2850 Nærum · Denmark Telephone: +45 7741 2000 · Fax: +45 4580 1405 · www.bksv.com · info@bksv.com Local representatives and service organisations worldwide...

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