Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1974-06-25
1976-10-05
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
179 15AV, 340347AD, 340347DA, H03K 1302
Patent
active
039848299
ABSTRACT:
A circuit arrangement is described for converting pulse amplitude modulated (PAM) signals into pulse code modulated (PCM) signals and vice versa utilizing a nonlinear bend characteristic, rather than carrying out a linear conversion. A voltage having a value which varies in time in accordance with the foregoing characteristic is compared with the analog signal. A detected correspondence as a result of the comparison causes the operation of a memory circuit, which continually stores a code train corresponding to the amplitude of the aforementioned voltage, to be stopped. This produces a train of bits which is the PCM equivalent of the analog signal. For converting PCM signals into PAM signals a voltage is generated which has an amplitude characteristic corresponding to the nonlinear bend characteristic. A function generator produces a voltage which has a wave shape corresponding to the nonlinear characteristic. The function generator is triggered from a clock actuated register in which is registered a code train corresponding to the instantaneous amplitude in accordance with the nonlinear characteristic. A digital comparator compares the register output to the PCM signal to be converted. Upon detection of correspondence between the digital values in the register and the PCM signal, the instantaneous value of the function generator output is emitted, and such signal values occurring over a period of time form the analog or PAM signal.
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Lett Gerald L.
Siemens Aktiengesellschaft
Sloyan Thomas J.
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