Audiometer with photo sensitive, digitally tunable low distortio

Details Audiometer with photo sensitive, digitally tunable low distortio Audiometer with photo sensitive, digitally tunable low distortio

1981-02-23

1983-07-19

Grimm, Siegfried H.

Oscillators

With device responsive to external physical condition

Temperature or light responsive

179 1N, 250568, 331179, 340347P, H03B 520

Patent

active

043946275

ABSTRACT:
To provide for tuning of an oscillator circuit, a plurality of resistors are selectively connectable in the circuit. To provide for reproducible, accurate oscillation frequency in accordance with switching of a respective resistor in dependence on a digital input signal, electronic switches are respectively connected to the resistors to connect them in circuit in the oscillator to thereby eliminate variable contact resistances of mechanical switches. A digital frequency control signal is generated by placing a movable mask or pattern with openings therein between an array, for example a linear strip of light emitting diodes, and a similar strip of photo transistors, the respective energization of which is determined by openings in the diaphragm. The signals from the photo transistors are stored in a memory, typically a group of flip-flops, for application to the electronic switches controlling connection of the respective resistors in the oscillator circuit.

REFERENCES:
patent: 3453599 (1969-07-01), Lester
patent: 3601584 (1971-08-01), Kashio
patent: 3891939 (1975-06-01), Bennett et al.
patent: 4021756 (1977-05-01), Podowski et al.
Gerd Koetter Low non Linear Distortion; Harmonic Distortion Funkschau 1978, Heft 8, pp. 347, 348.

Affiliated with

Also associated with

Rating

Audiometer with photo sensitive, digitally tunable low distortio does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Audiometer with photo sensitive, digitally tunable low distortio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Audiometer with photo sensitive, digitally tunable low distortio will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-753626