Frequency signaling method and apparatus with dynamic compensati

Details Frequency signaling method and apparatus with dynamic compensati Frequency signaling method and apparatus with dynamic compensati

1982-01-29

1983-08-30

Schreyer, Stafford D.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

179 617, 455 67, 455 71, H04M 324

Patent

active

044018606

ABSTRACT:
Frequency encoded signaling method and structure to correct for frequency error introduced in the generation of encoded signals. A sequence of frequency encoded signals are recorded on rotating magnetic recording devices in telephone offices in conjunction with recorded announcements. The signals identify the types of announcements. Speed variations in the different recording devices introduce frequency errors in the reproduction of the signals, hindering their automatic decoding. This problem is solved by recording a reference frequency signal with the encoded signals on the recording devices. A receiver detects the signals and measures the difference between the expected reference signal frequency and the received reference signal frequency. The measured frequencies of the encoded signals are then adjusted in accordance with the difference before final examination and classification of the signal sequence is perfor

REFERENCES:
patent: 3040298 (1962-06-01), Thomas, Jr. et al.
patent: 3766472 (1973-10-01), Whitney
patent: 3920913 (1975-11-01), Keeney
patent: 4161722 (1979-07-01), Tatch
patent: 4199668 (1980-04-01), Scozzari

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