Signal transmitting apparatus using A/D converter and monostable control circuit
First Claim
1. In a signal transformation system for converting between a first type of signal and a corresponding value of a second type of signal, one of said types being an analog signal and the other of said types being a digital signal within a range of values between zero and a maximum value, apparatus comprising:
- A. amplitude adjustment means for adjusting the amplitude of said analog signal, said means having at least first and second settings, the output amplitude of said analog signal from said adjustment means being greater by a predetermined ratio in said first setting than in said second setting; and
B. control means comprising a monostable circuit having a stable condition and a unstable condition in which it remains for a predetermined time after it is actuated, said control means being connected to said amplitude adjustment means and responsive to said maximum digital value of said digital signal when said monostable circuit is in said stable condition to actuate said monostable circuit to change to said unstable condition to set said amplitude adjustment means to said second setting for the duration of the time said monostable circuit remains in its unstable condition said control means comprising a multisection digit register to receive said digital signals, an AND gate connected to said digit register to respond to a 1 condition in each section of said register, and a monostable multivibrator connected to said AND circuit to respond to 1 signals therefrom to set said amplitude adjustment means to said second setting.
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Abstract
An amplitude adjustment circuit transmits an analog signal to an analog-to-digital converter. If the resulting digital signal reaches the maximum permissible digital value, a monostable control circuit is triggered to cause the amplitude adjustment circuit to reduce the level of the analog signal a certain amount. If the digital signal again reaches the maximum permissible digital value before the control circuit returns to its stable condition a second monostable circuit is triggered (and the first one is retriggered) to cause the amplitude adjustment circuit to reduce the level of the analog signal another amount. The unstable interval for the second monostable circuit is shorter than for the first, and, in the absence of further triggering, both such circuits return to their stable states in succession. The digital signals are used to reconstruct the analog signal in apparatus similar to the encoding apparatus and including amplitude adjustment apparatus controlled by the amplitude compression signals.
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Citations
6 Claims
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1. In a signal transformation system for converting between a first type of signal and a corresponding value of a second type of signal, one of said types being an analog signal and the other of said types being a digital signal within a range of values between zero and a maximum value, apparatus comprising:
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A. amplitude adjustment means for adjusting the amplitude of said analog signal, said means having at least first and second settings, the output amplitude of said analog signal from said adjustment means being greater by a predetermined ratio in said first setting than in said second setting; and B. control means comprising a monostable circuit having a stable condition and a unstable condition in which it remains for a predetermined time after it is actuated, said control means being connected to said amplitude adjustment means and responsive to said maximum digital value of said digital signal when said monostable circuit is in said stable condition to actuate said monostable circuit to change to said unstable condition to set said amplitude adjustment means to said second setting for the duration of the time said monostable circuit remains in its unstable condition said control means comprising a multisection digit register to receive said digital signals, an AND gate connected to said digit register to respond to a 1 condition in each section of said register, and a monostable multivibrator connected to said AND circuit to respond to 1 signals therefrom to set said amplitude adjustment means to said second setting. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification