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sponse in order to obtain accurate phase information. SYSid then uses FFT techniques to deconvolve the stimulus from the measured response and to further analyze the data. From this basic mode of operation SYSid can perform many types of analyses including phase responses, group delay, impulse response, Hilbert envelope, reverse energy time curve, RT60, waterfall displays, electrical impedance, etc. In addition to these linear measurements, SYSid also provides the capabilities to make distortion measurements due to nonlinearities in the system. These include harmonic distortion, intermodulation distortion, THD+ N, and input-output functions. With the current incarnation of SYSid each channel can be up to 32k sample points. Each channel is 16 bits and can be sampled at a maximum rate of 50 kHz. Examples of measurements made in areas of room acoustics, transducer design, and auditory physiology will be presented. 2:15 $pAA6. Measuring and predicting the effect of an audience. J.S. Bradley (Acoust. Lab., Inst. for Res. in Construction, Natl. Res. Council, Ottawa, ON K1A 0R6, Canada)

A short communication on page 415 of this issue of The Veterinary Record draws attention to the high suicide rate among members of the veterinary profession. In this article, Professor Richard Halliwell, who has recently chaired a series of meetings on this matter at the Royal College of Veterinary Surgeons, and Mr Brian Hoskin, chairman of the Veterinary Benevolent Fund, describe some of the support mechanisms available to veterinary surgeons and discuss what more might be done.

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This paper reviews progress in making newer types of auditorium acoustics measurements over the past 10 years. All of the newer measures require impulse responses to be obtained and the merits and limitations of various measurement approaches will be discussed including the type of source, receiver, and processing that is used. Objective descriptions and the subjective relevance of the various types of newer measures will be reviewed including both monaural and binaural quantities. Four generations of measurement systems will be described including the special problems associated with measuring inter-aural cross correlation coefficients. Finally the questions of accuracy and repeatability will be mentioned along with some discussion of future developments and problems to be solved.