Tape recorder with digital automatic level control
First Claim
1. An automatic level control circuit having input means for carrying an input signal, output means for carrying an output signal, peak detecting means for detecting input signal peaks above a desired level, low level detecting means for determining an averate input signal below a predetermined level, and digital counting means having a voltage output level responsive to signals from the peak detecting means and low level detecting means.
1 Assignment
0 Petitions
Accused Products
Abstract
An audio tape recorder having particular utility for retrofitting vehicles having radios, tape players, or other audio generating devices has an automatic signal level control circuit adaptable to very wide ranges of input circuit level. The circuit has a variable resistor in parallel with the audio output having a resistance level dependent on the voltage output of a digital voltage counter. The voltage counter sets out a discrete stepped output dependent on signals generated from a peak detector, which detects input signal peaks above a preset level, and a low level detector, which detects average input signal levels below a predetermined level. A delay switch prevents the low level detector from actuating the counter for a preset period.
-
Citations
8 Claims
- 1. An automatic level control circuit having input means for carrying an input signal, output means for carrying an output signal, peak detecting means for detecting input signal peaks above a desired level, low level detecting means for determining an averate input signal below a predetermined level, and digital counting means having a voltage output level responsive to signals from the peak detecting means and low level detecting means.
-
8. An audio magnetic tape recording unit adapted to receive a large variation in input signal level having a circuit for maintaining the input signal level to the unit within predetermined levels, circuit comprising input means for carrying an input signal, output means for carrying an output signal, peak detecting means for detecting input signal peaks above a desired level, low level detecting means for determining an average input signal below a predetermined level, and digital counting means having a voltage output level responsive to signals from the peak detecting means and low level detecting means.
Specification