Persistent pupillary membrane (PPM): PPM is rare, but possible.

The three most common serious conditions that can affect Heelers are Collie eye anomaly, Primary lens luxation and Persistent pupillary membranes.

Persistent pupillary membrane (PPM) is a condition of the eye involving remnants of a fetal membrane that persist as strands of tissue crossing the pupil.

In the PBGV Club of America 2000 survey, the most common diseases reported by owners of 640 dogs were persistent pupillary membranes, recurrent ear infections, hypothyroidism, neck pain, and epilepsy.

Problems only occasionally found include cardiomyopathy, allergies, vaginal hyperplasia, cruciate ligament rupture, hypothyroidism, OCD, entropion, progressive retinal atrophy (PRA), and persistent pupillary membranes (PPM).

The pulse-position modulation of Internet 0 operates best over a segregated wire, but it works in many media.

Typically the transmitter multiplexes all the channels into a single pulse-position modulation radio signal.

Pulse-position modulation.

Teddy Ruxpin movement data is encoded as a series of rapid pulse groups known as pulse-position modulation.

The "universal powerline bus", introduced in 1999, uses pulse-position modulation (PPM).

May also involve pulse-position modulation, biphase/manchester encoding, etc. of the transmitted pulses (as opposed to the carrier itself).

Internet 0 is similar to a serial port running at 9600 baud except it sends data by pulse-position modulation, and accepts up to 30% timing deviations.

In the US and the USSR, the Messina system was quickly replaced with better systems (in both cases, based on pulse-position modulation).

This method of encoding data as a relative position of a pulse is a well-known and used method in digital communications known as Pulse-position modulation (PPM).

The MTR also commanded the missile by way of pulse-position modulation, the pulses were received, decoded and then amplified back for the MTR to track.

Pulse-position modulation (PPM) is a form of signal modulation in which M message bits are encoded by transmitting a single pulse in one of possible time-shifts.

Pulse-amplitude modulation is widely used in baseband transmission of digital data, with non-baseband applications having been largely replaced by pulse-code modulation, and, more recently, by pulse-position modulation.

It can also refer to pulse-position modulation, which in its simplest form employs 2 discrete pulses (referring to the unique positions of the pulse within the transmission window) to transmit k bit(s) per pulse.

Therefore, it is often implemented differentially as differential pulse-position modulation, whereby each pulse position is encoded relative to the previous, such that the receiver must only measure the difference in the arrival time of successive pulses.

Most popular modulation schemes can be described by showing each point on a constellation diagram, although a few modulation schemes (such as MFSK, DTMF, pulse-position modulation, spread spectrum modulation) require a different description.