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Digital frequency-modulation stereo emitter and digital frequency-modulation duplex circuit

A multiplex circuit and stereo technology, applied in electrical components, transmission systems, etc., can solve problems such as poor anti-noise interference, reduced sound clarity, and interference

Inactive Publication Date: 2009-02-04
AVID ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] It can be seen from the above description that the current FM stereo transmitter is mainly used to process analog sound signals, and a large number of analog circuit designs are used, which cannot effectively reduce the cost of integrated circuits, and its anti-noise effect is not good, and it is easily reduced by interference. sound clarity

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  • Digital frequency-modulation stereo emitter and digital frequency-modulation duplex circuit
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  • Digital frequency-modulation stereo emitter and digital frequency-modulation duplex circuit

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Embodiment Construction

[0060] The FM stereo transmitting circuit of the present invention directly receives digitized serial sound data, and internally performs multiplex modulation processing in a digital manner, and finally converts it into an analog stereo composite signal. The artificially processed signal-to-noise ratio improves the sound quality at the receiving end.

[0061] see figure 1 Shown, be a preferred embodiment of the FM stereo transmitter of the present invention, it comprises:

[0062] A digital sound effect input / output interface 10 is used to connect a digital sound effect storage device in a compatible format to obtain digital sound data; wherein the digital sound effect input / output interface is an IIS or IIC digital sound effect format interface (ie: CD-ROM, MP3. .and other digital output interfaces);

[0063] A digital FM stereo multiplexing circuit 20 obtains parallel digital sound data through the digital audio input / output interface 10, and after digital multiplexing mod...

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Abstract

The invention relates to a digital FM stereo generator and a digital FM stereo multiplex circuit used by the generator, and mainly provides the digital FM stereo multiplex circuit. The digital FM stereo multiplex circuit directly different from the traditional analog type multiplex modulation, adopts a digital multiplex process. The output end of the multiplex circuit can be converted into an analog type stereo compound signal through a simple low-pass filter, resulting in an excellent noise ratio (S / N); the digital FM stereo multiplex circuit designed in a digital circuit, is easy to use system clock signals of other external circuits directly as sequence signals, and is able to be converted directly into a plurality of sequence signals used in a stereo modulation generator within a reasonable range from 8 to 40 MHz without deliberately using a quartz oscillator exhibiting a multiple relation with sequence, so as to gain the excellent application variability.

Description

technical field [0001] The invention relates to a frequency-modulation stereo transmitter, especially a digital frequency-modulation stereo transmitter using a digital multiplexing circuit, so that the frequency-modulation stereo transmitter can directly receive digital sound signals and process them before transmitting them to the outside. Background technique [0002] In order to achieve stereo FM wireless signals in the early days, it was proposed to use two sets of FM wireless transmitters to transmit the sound signals of the left and right channels respectively, and then the sound signals of the left and right channels were played by two wireless receivers respectively to achieve Listen to the effect of stereo; However, this technology is too economical and practical to give up. [0003] The current common practice of FM stereo transmitter is to switch the analog sound signal of the left and right channels (generally connected to the AUX analog sound terminal) through a...

Claims

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Application Information

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IPC IPC(8): H04B1/04
Inventor 陈天任林万荣温世斌江建山
Owner AVID ELECTRONICS CORP