DPSK-demodulating apparatus

Details DPSK-demodulating apparatus DPSK-demodulating apparatus

1992-10-19

1993-09-14

Heinz, A. J.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 18, G11B 509

Patent

active

052454843

ABSTRACT:
A data signal reproducing apparatus has an envelope detector for detecting a DPSK-modulated data signal, a change point detector for detecting a point of change of the detected envelope, and a latch for inverting and holding an output signal every time the change point detector detects a point of change of the envelope. An electronic still camera incorporating the data signal reproducing apparatus has a magnetic head that reads a picture signal and a DPSK-modulated data signal which have been recorded on a recording medium in the form of a multiplex recording signal. An extracting device extracts the DPSK-modulated data signal from the multiplex recording signal read by the magnetic head.

REFERENCES:
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patent: 4454499 (1984-06-01), Yarborough, Jr.
patent: 4628271 (1986-12-01), Takayama
patent: 4651108 (1987-03-01), Okita et al.
patent: 4827357 (1989-05-01), Kawakami
patent: 4970582 (1990-11-01), Scott
Kaden, H.: Impulse Und Schaltvorgange In Der Nachrichtentechnik, Munchen, Oldenbourg-Verland 1957, pp. 174-182.
English Abstract to Japanese Publication 62-223855.
English Abstract to Japanese Publication 62-224145.
English Abstract to Japanese Publication 63-2446.

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