Analog audio and aes3 digital audio mixed signal automatic switching device
A mixed-signal, digital audio technology, applied in the field of broadcast communication, can solve problems such as affecting the normal broadcast of broadcast programs, long broadcast broadcast time, and less downtime for maintenance.
Active Publication Date: 2018-09-18
王洴
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Problems solved by technology
Now the broadcasting time is long, the time for downtime and maintenance is less, and a little accident in the replacement process may affect the normal broadcasting of the radio program
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[0028] For the problems existing in the single type automatic switcher, the present embodiment adopts magnetic latching relay, latest audio codec chip and CPLD (complex programmable logic chip), designs and develops a kind of analog audio and AES3 digital audio mixed signal automatic switching device ( Hereinafter referred to as the mixed-signal automatic switcher), which solves the problems of coexistence and mixed use of the analog and digital systems mentioned above.
[0029] 1. Magnetic latching relay
[0030] Both the mixed-signal input circuit and the power-off direct circuit use a magnetic latching relay, which is used to solve the problem that the signal type selected by the input circuit and the power-off direct circuit does not change when the power is off. Here we first introduce the magnetic latching relay.
[0031] The magnetic latching relay is a new type of relay developed in recent years. Like other electromagnetic relays, it can automatically switch on and off...
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The invention discloses a device for automatically switching analog audio and AES3 digital audio mixed signals, wherein both two reset terminals of a double-pole double-throw magnetic latching relay of a mixed signal input circuit are connected with an audio AD conversion chip; both two set terminals of the double-pole double-throw magnetic latching relay are connected with a digital audio receiving chip; the audio AD conversion chip and the digital audio receiving chip in the mixed signal input circuit are respectively connected with a complex programmable logic device U6 in a switching detection circuit; and the complex programmable logic device U6 in the switching detection circuit is respectively connected with an audio DA conversion chip U4 and a digital audio sending chip U5 in an output conversion circuit. According to the device disclosed by the invention, input selection of analog and digital signals is realized through the magnetic latching relay; an analog signal can be input; a digital signal also can be input; furthermore, after conversion, digital audio and analog audio signals can be respectively output; and thus, automatic analog and digital switchers can be replaced simultaneously.
Description
technical field [0001] The invention relates to the technical field of broadcast communication, in particular to an automatic switching device for analog audio and AES3 digital audio mixed signals. Background technique [0002] In order to ensure the safety of the signal source of the broadcasting program, a broadcasting station has multiple signal sources to guarantee a program, such as optical fiber, satellite and microwave, etc., and several program sources are mutually backed up, and an audio automatic switcher (hereinafter referred to as the automatic switcher) is used to The program signal source is selected and switched, and sent to the broadcast transmitter for broadcast. The automatic switcher monitors the status of each input signal in real time. If the signal source being broadcast is interrupted or fails, the automatic switcher will automatically switch to other effective backup signal sources to ensure that the broadcasting of broadcasting programs will not be i...
Claims
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IPC IPC(8): H04B1/04
CPCH04B1/04H04H20/103
Inventor 王洴聂广才孙贤锐沈学东王义林
Owner 王洴