CN2135222Y - Frequency-modulation stereo transmitter and radio active voice box - Google Patents
Frequency-modulation stereo transmitter and radio active voice box Download PDFInfo
- Publication number
- CN2135222Y CN2135222Y CN 91202813 CN91202813U CN2135222Y CN 2135222 Y CN2135222 Y CN 2135222Y CN 91202813 CN91202813 CN 91202813 CN 91202813 U CN91202813 U CN 91202813U CN 2135222 Y CN2135222 Y CN 2135222Y
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- circuit
- stereo
- frequency
- modulation
- voice box
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- Expired - Lifetime
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Abstract
The utility model relates to a frequency-modulation stereo transmitter and a radio active voice box. The frequency-modulation radio transmission stereo audio frequency signals are adopted between the frequency-modulation stereo transmitter and the radio active voice box without the connection of conducting wires. A sound field control circuit is arranged in the frequency-modulation stereo transmitter. The radio active voice box is composed of a frequency modulation receiving circuit, a stereo decoding circuit, a left-right sound channel selecting circuit, an audio frequency power amplification circuit, a power supply circuit and loudspeakers. When the radio active voice box is optionally arranged, the radio active voice box can also keep the satisfactory stereo playback effect. The utility model is a sound reproducing apparatus with the advantage of simple and convenient use.
Description
The utility model belongs to wireless transmission stereo audio signal technology, relates to pilot tone system f-m stereo acoustic transmitter and wireless active audio amplifier.Reflector is with pilot tone system mode of frequency regulation emission transmission stereo audio signal, and the wireless active audio amplifier is used for receiving respectively expanding puts the left and right acoustic channels audio signal.
All kinds of public address systems that use generally are divided at present: source of sound+loudspeaker+audio amplifier mode, or source of sound+active audio amplifier mode.In use being lead between each functional unit connects.When they connect in weak signal, need to adopt shielding conductor, in case noise jamming; When connecting, strong signal need adopt the special lead of low-resistance, to reduce power consumption penalty and to the influence of damping characteristic.These specification requirements are given and used on-the-spot layout to bring certain difficulty, and are particularly more inconvenient when the interim use of public address system.
The utility model purpose is to provide a kind of pilot tone system f-m stereo acoustic transmitter and wireless active audio amplifier, adopts pilot tone system frequency modulation wireless transmission audio signal between reflector and audio amplifier, does not have any lead and pins down.This is very convenient, particularly more convenient to interim meeting-place is set for layout dance hall, club.
The utility model can be realized with such measure: wireless active audio amplifier (WY) selects circuit (3), stereo decoding circuit (4) and FM reception circuit (5) and power supply circuits (6) to form by loud speaker and casing (1), one road audio power amplifying circuit (2), left and right acoustic channels, they all are installed in the sound box, become a separate functional unit.Pilot tone system f-m stereo acoustic transmitter (TF) is made up of pilot tone system FM multiplex modulation transmitter (7), sound field control circuit (8) and power supply circuits (9).
The utility model accompanying drawing is as follows:
Accompanying drawing one: the circuit diagram of pilot tone system f-m stereo acoustic transmitter.
Accompanying drawing two: the circuit diagram when wireless active audio amplifier L channel uses.
Accompanying drawing three: the circuit diagram when wireless active audio amplifier R channel uses.
The utility model is described in further detail below in conjunction with accompanying drawing:
1. in the pilot tone system f-m stereo acoustic transmitter of the present utility model (TF), pilot tone system FM multiplex modulation transmitter (7) and power supply circuits (9) are the standard application circuit of pilot tone system FM multiplex modulate emission integrated circuit BA1404.Because no lead leads connection between source of sound of the present utility model and the wireless active audio amplifier, can in environment for use, place arbitrarily, for the sound field effect that guarantees stereophonic reproduction does not change because of the audio amplifier placement location is different, therefore before, at stereo audio signal input pilot tone system FM multiplex modulate emission circuit (7) adjunction sound field control circuit (8).This control circuit is to insert an inverter (F) respectively in R and L signal input circuit, between the input of inverter (F) output and this road signal, connect a potentiometer (w), its mid point is received the input of another road signal, stack amount by positive or inversion signal between regulator potentiometer (w) change stereo audio signal two sound channels, to realize the sound field adjustment of R ± △ L and L ± △ R, thereby the playback center harmony field width degree between the adjustment audio amplifier can make the wireless active audio amplifier can arbitrarily place and have satisfied sound field effect like this.
2. wireless active audio amplifier of the present utility model (WY) is by power supply circuits (6), FM reception circuit (5), stereo decoding circuit (4) and one road audio power amplifying circuit (2) and loud speaker and casing (1) constitute, connect in the formula at circuit, the adjunction left and right acoustic channels is selected circuit (3) between stereo decoding circuit (4) and one road power amplification circuit (2), determine that by a double-pole switch (K) it is the L channel (L) or the signal of R channel (R) that this wireless active audio amplifier expands what put, this switch is also controlled a variable color light-emitting diode (LED) simultaneously, with its different colours indicate expanded the playback different sound channels of signal frequently.In order to reappear the sound field effect of stereo audio signal, the wireless active audio amplifier generally all is paired use (WY-L, WY-R), and the switch of track selecting circuit (3) should be positioned over diverse location respectively.
Because the selected integrated circuit of wireless active audio amplifier neutral body sound codec circuit (4) possesses stereo/monophony and discerns translation function automatically, so the utility model can be used with commercially available FM wireless microphone easily, interim meeting-place that these characteristics are applicable to and give a report, give a lecture very much or layout audio-visual classroom.
What the FM reception circuit (5) in the wireless active audio amplifier of the present utility model was selected for use is the standard reception integrated circuit of FM broadcasting, receive frequency is adjustable between the 88-108MHz, also can select for use FM/MA two wave bands to receive integrated circuit, as CXA1238s etc. according to user's needs.Wireless active audio amplifier of the present utility model is like this put the signal of the utility model reflector and the signal of FM wireless microphone except receiving to expand, realize beyond the aforementioned functional, can also directly receive to expand and put the FM/MA station broadcast, this function to the user play news and current affairs, entertainment has significant practical applications very much.
Wireless active audio amplifier of the present utility model can be according to user's needs when making, at track selecting circuit (3) one road audio power amplifying circuit and the loud speaker and the casing of multi pack different output power afterwards, to form the series of products of different size model, be 1W, 5W, 10W, 25W, 50W etc. as power output; In use can also be according to field condition, set up somely to the wireless active audio amplifier, open simultaneously, can reach the purpose that increases the power that amplifies.Because frequency-modulated signal transmission is not subjected to the restriction of buildings in general, so this characteristic has special practical value to setting up sub-venue.
No lead pins down between reflector of the present utility model and the wireless sound box, and transmission range 50-100 rice is arbitrarily placed audio amplifier and also can be guaranteed the stereo sound field effect; Increase amplify power and to set up sub-venue very convenient; Can also expand the station broadcast program with directly receiving by the commercially available FM wireless microphone of adapted, be a kind of public address equipment easy to use, broad-spectrum.
Claims (2)
1, a kind of pilot tone system f-m stereo acoustic transmitter, the typical application circuit that comprises pilot tone system FM multiplex modulate emission integrated circuit, it is characterized in that: before the typical application circuit of pilot tone system FM multiplex modulate emission integrated circuit, adjunction the sound field control circuit, this control circuit is to insert an inverter respectively in R and L signal input circuit, connect a potentiometer between the input of inverter output and this road signal, its mid point is received the input of another road signal.
2, a kind of wireless active audio amplifier, it is characterized in that: it is made up of the FM reception circuit, stereo decoding circuit, one road audio power amplifying circuit, power supply circuits and the loud speaker that are installed in the sound box, between stereo decoding circuit and one road audio power amplifying circuit, be connected to left and right acoustic channels and select circuit, this selection circuit comprises that one is used for selecting the sound channel that this wireless active audio amplifier expands discharge signal, and controls the double-pole switch of variable color luminous tube to its indication simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91202813 CN2135222Y (en) | 1991-02-27 | 1991-02-27 | Frequency-modulation stereo transmitter and radio active voice box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91202813 CN2135222Y (en) | 1991-02-27 | 1991-02-27 | Frequency-modulation stereo transmitter and radio active voice box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2135222Y true CN2135222Y (en) | 1993-06-02 |
Family
ID=33759899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91202813 Expired - Lifetime CN2135222Y (en) | 1991-02-27 | 1991-02-27 | Frequency-modulation stereo transmitter and radio active voice box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2135222Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014029073A1 (en) * | 2012-08-20 | 2014-02-27 | Liu Juntao | Miniature sound box with telescopic resonance cavity |
| CN107872754A (en) * | 2016-12-12 | 2018-04-03 | 深圳市蚂蚁雄兵物联技术有限公司 | A kind of multichannel surround-sound system and installation method |
-
1991
- 1991-02-27 CN CN 91202813 patent/CN2135222Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014029073A1 (en) * | 2012-08-20 | 2014-02-27 | Liu Juntao | Miniature sound box with telescopic resonance cavity |
| CN107872754A (en) * | 2016-12-12 | 2018-04-03 | 深圳市蚂蚁雄兵物联技术有限公司 | A kind of multichannel surround-sound system and installation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |