JPH0631958B2 - Musical sound information receiver - Google Patents

Description

The present invention relates to a musical tone information receiving apparatus for reproducing musical tone information, particularly musical score information transmitted by wire or wireless communication, into music.

Conventionally, musical tone information has been transmitted in an analog manner by wire or wireless communication when servicing a recipient at a remote location. Generally, on the transmitting side, music recorded on a record or tape is converted into an electric signal, an AM or FM modulated signal modulated by this electric signal is transmitted as a radio wave, and on the receiving side, this modulated wave signal is demodulated to produce the original musical sound. Playing the signal.

However, since the above-mentioned musical sound transmission method requires a wide occupied wave line bandwidth for the carrier signal, the amount of information that can be transmitted in real time is small, and S /
It had a defect of poor N ratio.

Therefore, in order to solve the above problem, a transmission system has been considered in which the musical score surface information is digitally transmitted and reproduced on the receiving side as music.

The present invention relates to a receiving apparatus for reproducing music information transmitted by this transmission method into music.

It is an object of the present invention to provide a musical tone information receiving apparatus which receives a carrier wave signal containing digital musical score contents on the transmitting side and plays music according to the contents of the demodulated digital signal.

FIG. 1 shows a musical tone information transmission system including a musical tone information receiving apparatus according to an embodiment of the present invention, which will be described in detail below.

The staff or musical score or musical symbol referred to here is the pitch, tone color,
It is a collective term for symbols such as volume that are necessary for playing music. In FIG. 1, the transmission system is composed of a music symbol conversion apparatus 100 and a transmission apparatus 101. The converter 100 is a device for converting the staff symbol shown in FIG. 2 into a multi-bit digital code signal, and the transmitter 101 is a device for modulating a carrier signal with the converted digital signal and outputting it. The output signal of the transmitter 101 is radiated as a radio wave by the transmitting antenna 102 in wireless communication, for example. The music symbol conversion apparatus 100 of FIG. 1 is configured as shown in FIG. 3, for example. Third
In the figure, reference numeral 301 is a musical score information input device having a key switch corresponding to a staff symbol. For example, as the pitch and other information for a piano, the number of key switches can be realized with about 100 or less. Reference numeral 302 is a decoder for converting the input information from the key switch into a digital electric code. In this case, 100 kinds or less of key input information can be represented by a digital code of about 7 bits or less. As shown in FIG. 4, the digitized musical tone information is collected for each basic unit of data, that is, for each data packet. In order to cope with a data error caused by the transmission line, each packet is added with a header portion of a synchronization signal or an error correction code by an error correction code addition circuit 303. For example, as shown in FIG. 4, a data packet 40 is added to a TV signal.
When 3 is multiplexed, horizontal synchronization signal 401 in blanking interval
Overlap between. Reference numeral 402 in FIG. 4 is a color subcarrier. Header part is CR sync signal, FC
Fleming code, which is an error correction code, and an identification code for identifying musical tone data from data for other purposes.

The data part is composed of musical tone numbers, score data, and the like. Further, if necessary, the information is converted into serial data by the serial data converter 304, and in the case of multiplexing with other signals, a carrier wave is mixed with these signals or separately in the transmission device 101 in a system suitable for the transmission path. It is modulated and radiated as a radio wave from the transmitting antenna 102 through the power amplifier. In FIG. 1, the receiving apparatus according to this embodiment comprises a receiving circuit 103 and a music playing circuit 104. The receiving device 103 includes a demodulation circuit 106 and a bit error detection / correction circuit 107.
Reference numeral 4 includes a code memory 108, a decoder 109, a tone generation circuit 110, and a speaker 111. The modulated carrier signal received by the receiving antenna 105 is demodulated by the demodulation circuit 1.
At 06, it is demodulated into a digital signal which is musical score symbol information.

The demodulated voice information data enters the bit error detection / correction circuit 107 in the form of serial data.

For error detection and error correction, there are many methods for error correction performed by the bit error detection / correction circuit 107 based on the error correction code added in the transmission system. It is roughly divided into detection and correction by.
The former corrects all errors within the code's correction capability, but requires many redundant bits compared to mere detection.
On the other hand, in the latter, an error is detected with a thin redundant bit and some correction is performed.

The bit error detection / correction circuit 107 can be configured by a digital circuit including a memory.

If necessary, the data that has been corrected or corrected is stored in the code memory 108. Code memory 1
The data once stored in 08 is read out at a predetermined timing and input to the decoder 109.

The role of the code memory 108 is to hold the data sent serially or for each packet for a period until the same data is sent next, and to output the data array which the decoder 109 can easily process. The decoder 109 generates a musical notation code of a musical tone from the input data. The musical notation code is control data according to the principle of various musical notation methods such as pitch, tone color, and volume, and is output in the order necessary for playing the musical notation and input to the musical tone generating circuit 110. The decoder 109 also has a function of recognizing the identification code of a music piece when a plurality of music pieces are continuously transmitted and selecting a necessary music piece from the outside.

Generally, the function of such a decoder can be realized by a microprocessor or a microcomputer. The tone generation circuit 110 has a configuration described in detail below and plays a tone according to the transmitted data.

As shown in FIG. 5, the tone generation circuit 110 includes a voltage controlled oscillator (VCO) 502, a voltage controlled filter (VCF) 503, and
This circuit is mainly composed of a voltage controlled amplifier (VCA) 504 and is a circuit for reproducing a musical tone by synthesizing three elements of music (pitch, tone color, and volume). Output signal 1 of the decoder 109 shown in FIG.
12 is a VCO 502 and a VCF 50 via the control I / O 501.
3. Control the VCA 504. VCO 502 is a control I / O
A sawtooth wave, a rectangular wave signal, or a triangular wave signal whose oscillation frequency is determined by the control voltage determined by the input code signal 112 to the 501 is output. The output signal of this VCO 502 has pitch information, and is tone-processed by VCF 503 and VCA 504 thereafter. The VCF 503 is a variable filter that determines the tone color by controlling the position of the cutoff frequency with a control voltage to control the content of overtones. The envelope generators 507 and 508 have a function of generating an envelope of a control voltage represented by ADSR (attack time, decay time, sustain level, release time), and the VCF 503 controlled by the envelope generator 507.
The timbre changes over time, creating a timbre unique to each instrument.

Since the VCA 504 has its volume changed by a control voltage and is also controlled by the output of the envelope generator 508, it is possible to create a volume change peculiar to each musical instrument. In this way, the music synthesized by the external control signal is amplified by the amplifier 505 and output as a musical sound by the speaker 506.

When complex tones are needed, I / O section, amplifier,
The speaker is a common part, and VCO and V are the number of required musical sounds.
A set of CF, VCA, and envelope generator may be prepared.

There is also a method shown in FIG. 6 as a tone generation circuit.
Reference numerals 601 to 612 are a group of 12 oscillators that generate a basic octave pitch.

601-1 to 612-n generate pitches and signals of n octaves required by the 1/2 frequency divider. These pitch signals are finally mixed by going through a timbre processing process, and become musical instrument sounds, which are generated from a speaker. In addition, control I / O
It is also possible to replace 501 with a keyboard function, such as an electronic organ, an electronic piano, or a music synthesizer. Here, a specific example of the amount of information required for music transmission by this method will be given.

When the musical score notation as shown in FIG. 2 is used as an electric signal transmission code, it is assumed that one musical score notation is converted into a digital electric signal of about 10 bits. If the measure to be transmitted is composed of four quarter notes, the score can be represented by data of about 200 bytes (1600 bits).

In the embodiment of FIG. 1, the code memory 108 of the music playing circuit 104 may be removed and the output signal of the bit error detection / correction circuit 107 may be directly input to the decoder 109 to enable real-time performance.

According to the receiving device of the present invention, since the music generated by the device for generating the musical instrument sound contained in the device is directly generated by the device, an extremely high quality electronic musical instrument without the signal deterioration due to the transmission line as in the prior art is used. Music, eg electone,
You can play music from synthesizers, electronic pianos, and electronic rhythm machines. Further, the invention of the present application is based on a combined operation of a memory circuit and a decoder based on a digital signal containing a code corresponding to a musical symbol written on a musical score.
Since the control data according to the principle of various notational notation is generated and outputted in a predetermined order, it is possible to convert a digital signal having a small amount of information into music.

The receiving device according to the present invention is extremely effective particularly as a receiving device for reproducing, as music information, a digital signal corresponding to a staff symbol multiplexed and transmitted to a blanking signal of a television broadcast radio wave.

This receiver transmits background music for teletext,
It can be used for remote performance service of electronic musical instruments, automatic musical performance of electronic musical instruments using magnetic tapes with recorded music codes, etc.

[Brief description of drawings]

FIG. 1 is a block diagram showing a musical tone information receiving apparatus including a transmission system according to an embodiment of the present invention, FIG. 2 is an example of a musical score transmitted by the transmission system of FIG. 1, and FIG. 3 is shown in FIG. FIG. 4 is a block diagram of a music symbol converter of a transmission system, FIG. 4 is a data packet of a digitized music code, FIG. 5 is a diagram of a musical tone information receiver in the embodiment of the invention of FIG. 1, and FIG. 6 is a musical tone. 3 is a block diagram showing an example of a generation circuit. FIG. 103 ... Receiving circuit, 104 ... Music playing circuit, 106
...... Demodulation circuit, 107 …… Bit error detection and correction circuit, 1
08 ... Code memory, 109 ... Decoder, 110 ...
Musical tone generation circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Nakagawa 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Yoshio Sugimori 14 Nibancho, Chiyoda-ku, Tokyo 14 Nippon Television Network Incorporated (72) Inventor, Hideshi Kinomata 14 Nibancho, Chiyoda-ku, Tokyo Within Nippon Television Network Co., Ltd. ) Inventor Tomoji Arai 5-6-19 Sakurajosui, Setagaya-ku, Tokyo Within Keio Giken Kogyo Co., Ltd. (56) Reference JP-A-55-25049 (JP, A)

Claims (1)

[Claims] 1. Modulation with a digital signal grouped for each data packet consisting of a header section containing a sync signal code, an error correction code and an identification code, and a data section containing a code corresponding to a musical symbol written on a musical score. A demodulation circuit that receives the carrier wave signal via a wireless or wired communication and demodulates the digital signal, and a bit error detection and correction circuit that detects and corrects a bit error of the demodulated digital signal by the error correction code, A storage circuit for storing the digital signal output from the bit error detection / correction circuit, a decoding of the digital signal output from the storage circuit, identification of a transmitted song, conversion of music symbols, and various musical notation. A decoder that generates control data according to the notation principle and outputs the control data in a predetermined order, and a decoder based on the control data. A tone generation circuit for generating a musical tone, wherein the carrier signal is a signal in which a data packet of the digital code signal representing a music symbol is superimposed between horizontal sync signals in a blanking interval of the television signal, A musical tone information receiving apparatus, which is a signal in which character information is superimposed on another blanking interval.