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Sound intermediate frequency amplifier for a broadcast receiver

a technology of intermediate frequency amplifier and broadcast receiver, which is applied in the direction of transducer casing/cabinet/support, electric transducer, transducer, etc., can solve the problems of insufficient circuit operation and inability to achieve desired effect, and achieve good results

Inactive Publication Date: 2007-12-25
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a modification to a sound intermediate frequency amplifier that prevents distortion in audio reproduction, such as "POP" sounds. The modification involves connecting a dc source to the amplifier through a transistor and a resistor, which provides a smooth increase in voltage during power-up. Additionally, a zener diode is used to stabilize the voltage supplied to the amplifier. This results in a high-quality audio output from a simple circuit that includes only one transistor, one resistor, one capacitor, and one zener diode.

Problems solved by technology

However such known circuits operates not sufficiently so that in most cases an indesirable “POP” remains.

Method used

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  • Sound intermediate frequency amplifier for a broadcast receiver
  • Sound intermediate frequency amplifier for a broadcast receiver

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Embodiment Construction

[0009]In FIG. 1 an antenna 1 is connected to a tuner 2 of a television receiver. Output of tuner 2 is connected to a sound intermediate frequency amplifier and audio amplifier IC 3. IC 3 among other terminals has an operating voltage terminal 11 for supplying a dc operating voltage thereto and a terminal 10 providing output audio frequency signal which is fed via an audio amplifier 4 to loudspeaker 5 for sound reproduction.

[0010]Operating voltage U1 for IC 3 is supplied via the collector / emitter-path of a transistor T1 and resistor R1 to terminal 11 which is further connected to ground via capacitor C1. A second dc operating voltage U2 is connected via integrating circuit with resistor R2 and capacitor C2 to base of transistor T1, the base being connected to ground via zener diode Z1.

[0011]In connection with FIG. 2 the operating of the circuit according to FIG. 1 is explained. From t1 to t2 television receiver is switched off so that voltage U3 at terminal 11 is zero and no output v...

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Abstract

In a broadcast receiver, a dc voltage operating source is coupled to an operating voltage terminal of a sound IF integrated circuit via a collector / emitter path of a transistor, and a second source of operating voltage is connected via an RC integrating network to the base of the transistor, with the base of the transistor being connected to ground via a zener diode.

Description

FIELD OF THE INVENTION[0001]The invention relates to a sound intermediate frequency amplifier according to the introductory part of claim 1.BACKGROUND OF THE INVENTION[0002]Within a television receiver during a switching from “OFF” to “ON” or switching from “Stand-by” to “ON” audible disturbance within the reproduced sound occurs, which is generally called “POP”. This disturbances in form of a click is due to a sudden change in the operating voltage fed to the sound intermediate frequency amplifier IC. According to prior art capacitors are introduced to prevent such a sudden change in operating voltage. However such known circuits operates not sufficiently so that in most cases an indesirable “POP” remains.SUMMARY OF THE INVENTION[0003]It is an object of the invention to modify the circuit for the sound intermediate frequency amplifier in such a way that such disturbances in audio reproduction like “POP” do not occur or remain inaudible.[0004]The invention relates to a sound interme...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H03F1/26H03F1/30
CPCH03F1/305
Inventor CHIOK, HUAN S.
Owner THOMSON LICENSING SA
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