Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1976-09-30
1978-05-23
Smith, Jerry
Communications: electrical
Audible indication
Percussion-type sound producer
330 86, 330144, 360 67, G11B 502, H03G 330
Patent
active
040913805
ABSTRACT:
A multistage amplifier having an automatically programmable gain is disclosed in which the amplifier gain is incremented in binary steps to a desired level. Each amplifier stage is switchable between a first and second gain in a binary sequence such that the four digit output of a sixteen bit counter will increment the total amplifier gain in sixteen binary steps.
A readback and decoding circuit for reading magnetic tape is also disclosed in which the signal amplitude of data read from the magnetic tape is compared to a reference voltage which corresponds to the data readback clipping level. Only amplified data which exceeds the predetermined clipping level is gated out of the circuit for processing. Since input signal amplitude varies from tape to tape and from head to head, the automatic read amplification burst on each tape is used to preset the amplifier gain such that the amplified amplitude of the readback signal is maintained constant as long as the readback signal supplied to the amplifier is within a predetermined range. The amplifier gain is automatically incremented until the amplifier output exceeds the clipping level, thereby insuring that only valid data and not noise or undecodable data are processed.
REFERENCES:
patent: 3308392 (1967-03-01), McCarter
patent: 3331028 (1967-07-01), Bay et al.
patent: 3425051 (1969-01-01), Smith
patent: 3444550 (1969-05-01), Paulus
patent: 3464022 (1969-08-01), Locheed et al.
patent: 3579138 (1971-05-01), Harris et al.
patent: 3662365 (1972-05-01), Rodriguez et al.
patent: 3742489 (1973-06-01), Lefevre et al.
Cavender J. T.
Computer Peripherals Inc.
Hawk Jr. Wilbert
Lavin Richard W.
Smith Jerry
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