PCM Tape Recorder

High Density Pcm Magnetic Tape Recording

The Bell & Howell Enhanced-NRZ recording reproducing technique for bit packing densities up to 40,000 per track inch is described in this paper. Utilization of the pulse code modulation format of Enhanced-NRZ achieves this high density with a bit error rate of one in ten million. Bell & Howell’s standard VR-3700B instrumentation tape recorder and wideband instrumentation recording tape are used...

A 48-Channel PCM Tape Data-Acquisition System

Is there a tape recorder in your head? How the brain stores and retrieves musical melodies

Music consists of strings of sound that vary over time. Technical devices, such as tape recorders, store musical melodies by transcribing event times of temporal sequences into consecutive locations on the storage medium. Playback occurs by reading out the stored information in the same sequence. However, it is unclear how the brain stores and retrieves auditory sequences. Neurons in the anteri...

The Moon as a Giant Tape Recorder for Solar System and Solar Events

A unique lunar property The moon has a unique property compared to the terrestrial and gas giant planets of our solar system. This property consists of the ability to record and preserve evidence of both external and internal events and processes over a time span that includes most of solar system history. Every exposed surface of the moon accumulates implanted solar wind atoms, is modified by ...

Portable electro-phonocardiograph using magnetic tape recorder equipped with patient's voice print.

A newly devised instrument is described which permits recording of cardiovascular sound and electrocardiogram during exercise in man. It consists of a handy magnetic casette tape recorder and a modulator. This assembly is connected to a phonocardiographic microphone which is attached to the thorax with sticky tape. The voice of patient is also recordable, if necessary. Biological transducer wil...