User manual

Audio Generator
AM700 Audio Measurement Set User Manual
4-7
NOTE. Note: SMPTE and CCIF signal parameters are defined by these organiza-
tions. Changing the parameters of the IMD signals from those preset in the AM700
makes the resulting signal noncomplying with SMPTE or CCIF standards.
Shaped Noise. This signal can be either white noise or pink noise. White noise
contains equal energy across the band, while pink noise contains equal energy per
octave. This signal is available from either the analog or digital generator in high
resolution mode. It is not available in high bandwidth generator mode.
Signal parameters that can be specified include the type of noise (white or pink) and
the amplitude.
Chirp. This signal is a sine wave that rapidly and repetitively transitions from a high
to a low frequency. The chirp waveform can be used for quickly characterizing
frequency response. Parameters that can be set include amplitude, low-frequency
band edge, and high-frequency band edge (band edges are the chirp signal start and
stop frequencies).
Polarity. This clipped sine wave can be used with an oscilloscope to verify that a
stereo circuit is wired correctly. Parameters that can be set include frequency and
amplitude. This signal is available from either the analog or digital generator but is
not available in high bandwidth generator mode.
The polarity waveform contains harmonics that can produce undesirable effects in
certain circuits under test. For this reason, the Tek Polarity signal may be a better
choice for polarity tests.
Tek Polarity. This waveform consists of the sum of two equal-amplitude sine waves.
One has a fundamental frequency of 440 Hz and the other is the second harmonic of
that frequency, 880 Hz. The amplitude parameter can be set.
Like Polarity, Tek Polarity can be used to check wiring polarity of stereo channels.
User. The User waveform selection allows you to play a custom waveform from a
file. AM700 signal generators are able to play the contents of a block of memory,
repeating at the end of the block (the memory block holds a maximum of 16 K
samples of audio per channel). Data for the custom waveform comes from an audio
source file that can be created on a PC and transferred to the AM700 user files
using the disk drive.