Patent · US Expired

Mobile telephone having continuous recording capability

US6021325A · kind A · utility

111Cited by
6References
25Claims
0Family size

Assignee

Inventor

Key dates

Filing dateMar 10, 1997
Grant dateFeb 1, 2000
Priority date—
Expiry dateMar 10, 2017

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04M1/72433
  • WIPO fieldTelecommunications
  • WIPO sectorElectrical engineering

Abstract

A mobile telephone has a receiver, a transmitter, a microprocessor and an associated memory. The memory includes a first-in-first-out (FIFO) queue and a static buffer. An audio signal carried by the mobile telephone is digitized and provided to the microprocessor. The resulting digital signal is continuously written to the FIFO queue. In response to a first command from the mobile telephone user, the microprocessor causes the contents of the FIFO queue to be transferred to the static buffer. Upon a second command from the user, the contents of the buffer are converted to an analog signal and played back over the mobile telephone's speaker.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.