CN2173485Y

CN2173485Y - Digital audio frequency synthesis device

Info

Publication number: CN2173485Y
Application number: CN 94202350
Authority: CN
Inventors: 金元福
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-03
Filing date: 1993-06-30
Publication date: 1994-08-03
Anticipated expiration: 2003-06-30

Abstract

The utility model relates to a digital audio frequency synthesis device, which is mainly composed of a microprocessor CPU, an audio frequency synthesizer, a memory RAM for memorizing the basic audio information, an OS program memory ROM for memorizing variant forms of the audio frequency, and a D/A converter. Because of the composition and the special memory mode of the device, the utility model has the characteristics of large memory amount, quick song selecting operation, convenient audio signal adjustment, etc. The utility model also comprises a video processing device, so that the utility model is still more suitable for the KTV room and the utility model is better than the existing kara-ok equipment.

Description

Digital audio frequency synthesis device

The utility model relates to a kind of synthesizer of digital audio and video signals, particularly a kind of digital audio and video signals synthesizer of the record carrier with semiconductor memory.

At present, digital audio technology and production development are very fast, as CD audio equipment, it has high-fidelity, characteristics such as acoustics is good, now be because the melody that every CD dish of its data processing method restriction is put down in writing is few, in a big way, select song will frequently change the CD dish, particularly in the Karaoke singing-hall, use more to seem inconvenient.Though the external existing stereo set of selecting the CD dish automatically, its complex structure, selected songs speed is also slower.

The purpose of this utility model provides a kind of new digital audio synthesizer, and it is a record carrier with the semiconductor memory, utilizes distinctive data processing method, make and the utlity model has that the melody storage capability is big, selected songs rapidly, the tonequality excellent characteristic.

The utility model is to realize like this, it is by microprocessor CPU, source of sound IC modular unit, random memory ram and static storage ROM constitute, it is characterized in that microprocessor CPU is connected with random memory ram static storage ROM and source of sound IC modular unit with address bus and control signal wire through data/address bus, wherein ram memory is storing the digital signal of basic announcement waveform, and rom memory is storing the corresponding OS program of certain first melody; Source of sound IC module comprises audio frequency synthesizer integrated circuit, digital to analog converter D/A, operational amplifier, the data output end of audio frequency synthesizer links to each other with D/A converter, the analog signal output of D/A converter is connected with operational amplifier, operational amplifier output simulated audio signal, this signal mixes the back output audio signal with the audio signal of microphone MIC in Audio mixer.

The utility model can further include apparatus for processing of video signals, it comprises the digital video signal controller, link to each other with the dynamic memor RAM of storage basic announcement waveform with little processing CPU, Video Controller 8900 links to each other with CPU digital-to-analogue, transducer D/A, it converts digital video signal to analog signal output, genlock GSP-500 in vision mixer mixes outputting video signal with outer video signal with the vision signal that this device produces with synchronizing signal input video controller BA7230.

The stereo set of Gou Chenging promptly can provide audio signal like this, simultaneously also can be by the display output video information corresponding with audio signal, as the lyrics, still frame etc.

Because the mode of formation of the present utility model and signal processing, make its have the storage melody many, selected songs are convenient, fast, characteristics such as acoustics adjustment control is flexible are specially adapted to KTV singing-hall and family performance etc., and it is a kind of novel stereo set of software and hardware combining.

Further describe with regard to structure of the present utility model and operation principle below in conjunction with accompanying drawing.

Fig. 1 is the circuit theory diagrams of the utility model source of sound IC modular unit

Fig. 2 is the operation principle flow chart of the utility model source of sound IC modular unit

The of the present utility model circuit block diagram of Fig. 3 for combining with apparatus for processing of video signals and constituting.

Source of sound IC modular unit as shown in Figure 1, with audio synthesizing integrated circuit U35(EMU8801) be that core constitutes, it is not shown that it connects the dynamic memor RAM(that stores basic announcement, only mark lead end), read-only memory U36.37.U23 with the OS program of storing the particular track form, 25, the output DACD of audio frequency combiner circuit (EMU8801) connects D/A converter U48.89(AD1856), the output of change-over circuit connects dual operational amplifier (NJM5532); The digital input end of audio synthesizing integrated circuit connects ram memory and ROM, and the signal controlling end links to each other with processor CPU.Source of sound IC template is work under microprocessor CPU (8680) control, and the course of work is referring to Fig. 2, Fig. 3.

After the user imports the coding of a certain first melody by operating key or remote controller, seek out the OS program that the phase of storing among the memory ROM should music through decoding, the record of OS program be the digitized information of length, height and the tone color of the various sounds of this melody.According to OS program, source of sound IC module to read in the ram memory and the corresponding audio volume control digital signal corresponding of OS program, the digital signal of storing the waveform of the necessary corresponding basic announcement of audio reproduction in the ram memory, these digital signals are to be made of the amplitude of each audio volume control and the corresponding amplitude signal of phase place and phase signal.Along with constantly reading of OS program, be willing to that the amplitude signal of sound and phase signal also constantly read, synthetic through source of sound IC modular unit produces continuous audio signal.

Basic announcement signal among the dynamic memor RAM and the storage of the OS program singal among the read-only memory ROM enter buffer, and with the storage amplitude signal and phase signal offer amplitude generator and phase generator respectively, amplitude generator and phase generator are by shake signal and will export its audio amplitude value E and audio frequency phase value θ respectively according to amplitude signal and phase signal that buffer provides of sending out of providing of oscillator, simultaneously E, θ signal are sent into arithmetic unit then, the waveform of output ESin θ type after the computing of arithmetic unit.At this moment, time controller will provide clock signal to arithmetic unit, and regulate the speed of rhythm according to the audio frequency absolute velocity that arithmetic unit is calculated, be sent to D/A converter after temporarily being stored in buffer with the various audio signals of arithmetic unit output, time controller will provide for the bit rate of regulating the buffer output signal fixed clock signal.

Along with constantly the reading of the OS program in the rom memory, the basic announcement signal that is stored among the RAM is synthetic continuously, makes and finishes continuous sound or song like this.

Source of sound IC modular unit all is to work under total control of processor CPU, and the user is by operating key or infrared remote controller input control information, as selected songs, change, tone etc.In addition, microphone MIC mixes back output through the audio signal that reverberator produces with the audio signal that source of sound IC modular unit produces in Audio mixer.

The utility model can further increase video process apparatus, and referring to Fig. 3, under the control of microprocessor CPU, control of video controller (TVGA8900) is connected with dynamic memor RAM, D/A converter (MU9C4870).The output of D/A converter connects blender (BA7230), genlock (GSP-500), output clock control signal and synchronizing signal are given Video Controller (TVG8900), the vision signal that outer video signal input video blender (BA7230) blender output is mixed simultaneously, video-unit constitute prior art.

Video process apparatus can show on display that the graph text information that is stored among the ROM, these information can be and music lyrics corresponding literal and still frame.Can be adapted to the needs that KTV sings like this.

Claims

1, a kind of digital audio synthesizer, by microprocessor CPU, source of sound IC modular unit, semiconductor memory constitutes, it is characterized in that microprocessor CPU is through data/address bus and address bus and control signal wire, with source of sound IC modular unit, the dynamic memor RAM of storage basic announcement links to each other with the static storage ROM of the OS program that storage performance audio frequency changes, the digital output end of source of sound IC integrated circuit is connected with operational amplifier with D/A converter successively, and operational amplifier simulated audio signal output is imported Audio mixer with the audio signal of microphone MIC output.

2, digital audio synthesizer as claimed in claim 1, it is characterized in that source of sound IC modular unit is made of for core audio synthesizing integrated circuit (EMU8801), its digital output end connects D/A change-over circuit (AD1856), and the output of change-over circuit connects dual operational amplifier (NJM5532); The digital input end of audio synthesizing integrated circuit connects ram memory and ROM, and the signal controlling end links to each other with processor CPU.

3, digital audio synthesizer as claimed in claim 1 or 2, it is characterized in that this audio synthesizer further comprises apparatus for processing of video signals, should be by digital video signal controller (TVGA8900), D/A converter (MU9C4870), genlock (GSP-500) and vision mixer (BA7230) constitute, Video Controller is under processor CPU control, the graph text information that input is stored in the ROM memory is treated, output digital information is given D/A converter (MU9C4870), input video blender again; Genlock output synchronizing clock signals is to video signal preprocessor, simultaneously with outer video signal input video blender.