EQUIPMENT AND SYSTEM FOR TELEVISION TRANSMISSION OF SPORTING EVENTS.

Abstract

Television broadcasting equipment and systems, especially for football matches, capture live audio from team coaches to include in the match broadcast, greatly enhancing the viewer experience. Audio feeds can include the microphone recording of each team's head coach, as well as the offensive and defensive play calls relayed by radio from assistant coaches to the players on the field.

Description

EQUIPMENT AND SYSTEM FOR TELEVISION TRANSMISSION OF SPORTING EVENTS CROSS REFERENCE This application claims priority over United States provisional patent application number 63 / 005,066, filed on April 3, 2020. BACKGROUND OF THE INVENTION In most televised professional and college football games, a team's head coach and assistant coaches (including assistant coaches on the sidelines and in the coaches' box) wear headsets with microphones to communicate with each other during the game, but live audio feeds from the coaches are not usually part of the television broadcast. BRIEF DESCRIPTION OF THE INVENTION In general terms, the present invention relates to equipment and systems for broadcasting sporting events on television, particularly for soccer games, which capture live audio from team coaches for inclusion in the game broadcast, thereby greatly enhancing the viewing experience for television spectators. The audio transmissions may include the microphone recording of each team's head coach, as well as offensive and defensive play calls transmitted by radio from each team's assistant coaches to the players on the field. In several implementations, the coaches of each team use communication units comprising a speaker, microphone, and radio transceiver so that they can communicate during the game through their respective team intercom systems. Additionally, some (and perhaps all) of the players on each team wear helmet receivers in their football helmets. These helmet receivers receive game calls from the assistant coaches of each team via radio transmissions.In other words, for example, the offensive players on a first team receive offensive play calls from a first-team offensive assistant coach; the defensive players on a first team receive defensive play calls from a first-team defensive assistant coach; the offensive players on a second team receive offensive play calls from a second-team offensive assistant coach; and the defensive players on a second team receive defensive play calls from a second-team defensive assistant coach. The broadcast system also includes radio equipment that intercepts these radio transmissions and sends them to the television broadcast truck at the game for inclusion in the television broadcast of the game.These audio transmissions may include, as previously mentioned, live microphone captures of each team's head coach, as well as the offensive and defensive play calls for each team. These and other benefits and advantages achievable through and with the present invention will become apparent from the following description. BRIEF DESCRIPTION OF THE FIGURES Several embodiments of the present invention are described here by way of example in conjunction with the following figures. Figures 1 and 2 are block diagrams of a communication system for the television broadcast of a football match according to various embodiments of the present invention. Figure 1 represents aspects for both teams, while Figure 2 focuses on communication aspects for one of the two teams. Figure 3 is a block diagram of one of the transmitter packages of the equipment illustrated in Figures 1 and 2. The transmitter packages of the two equipment can be identical. DETAILED DESCRIPTION OF THE INVENTION Figures 1 and 2 illustrate a television transmission system for sporting events 10 according to various embodiments of the present invention. The description that follows assumes that the transmission system 10 is used for football matches, although the transmission system 10 could be used for other types of sporting events or competitions if desired. The transmission system 10 is also preferably for live broadcasts, although the broadcasts could also be recorded for later viewing, such as a subsequent television broadcast or an internet stream or download. Figure 1 depicts the transmission system for both soccer teams (denoted as Team 1 and Team 2 in Figure 1), and Figure 2 is a more detailed representation of the transmission system for one of the teams (Team 1). Each player on each of the two teams is assigned a soccer helmet for use during the match. The helmets of all or only some of the players on each team may include a helmet receiver. The helmet receiver comprises a radio receiver that can receive radio game calls from the respective team's assistant coaches, as described later. The helmet receivers may be powered by rechargeable batteries and may be, for example, securely fitted between the shock-absorbing pads inside the players' helmets.In this way, helmet receivers can remain in place on helmets during the game without requiring structural modifications to the helmet; and they can be easily replaced if necessary without having to replace the helmet itself. The ProCom Technologies XI2MR helmet receiver is an example of a suitable helmet receiver. The number of offensive and defensive players on each team wearing a helmet with a helmet receiver during a game can vary depending on the circumstances. The broadcast system is preferably configured so that the number of offensive players on each team wearing a helmet with a helmet receiver during the game is the same, and so that the number of defensive players on each team wearing a helmet with a helmet receiver during the game is the same.For example, the number of offensive players on each team wearing a helmet with a helmet receiver during the game might be 15 to 20, while the number of defensive players on each team wearing a helmet with a helmet receiver might be 5 to 10. Each helmet receiver can be linked, as the case may be, to offensive or defensive play calls for a single team. In this way, players do not receive play calls from the opposing team, and offensive players do not receive defensive play calls from their own team, and vice versa. As shown in Figures 1 and 2, the coaches of both teams wear communication units comprising headsets and a corresponding waist pack that allow the coaches to communicate using wireless intercom systems. The headsets include an acoustic speaker and a microphone. The waist packs, which can be connected to the headsets by a cable, include a two-way radio transceiver. Each team's coaching staff could have five different coaching groups, as shown in Figure 2, which depicts the five coaching groups for Team 1. Team 2 could have identical coaching groups. The groups include (A) a head coach, (B) an assistant offensive coach, (C) one or more assistant offensive coaches, (D) an assistant defensive coach, and (E) one or more assistant defensive coaches.Coaches on different teams may have different switches on their communication units to control who they communicate with. In several implementations, for one of the teams (e.g., Team 1), the assistant offensive coach and the assistant offensive coaches may communicate wirelessly on one (first) radio channel; the assistant defensive coach and the assistant defensive coaches may communicate wirelessly on another (second) radio channel; the head coach may communicate with both the offensive coaches on the first channel and the defensive coaches on the second channel, but may only communicate on one channel at a time. Head coaches are typically on the sidelines during the soccer match.The offensive and defensive assistant coaches may be on the sidelines or in a respective coaching booth for each team at the game venue. In several configurations, the communication units can transmit in the 1.880 to 1.930 GHz DECT frequency band. One or more network antennas can be installed around the football pitch to link the communication units. For example, the coaches' communication units can be equipped with Bolero brand headsets and Riedel Communications beltpacks. The transmission system further comprises, as shown in Figures 1 and 2, a side-rack transceiver 12, a Team 1 transmitter box 14A, and a Team 2 transmitter box 14B, all of which are preferably positioned during play on the field behind or near one of the team benches. The sideline transceiver 12 preferably comprises two radio transceivers that communicate wirelessly with the communication units of each team's coach. For simplicity, only one sideline transceiver 12 is shown. In other embodiments, the system 10 could include multiple sideline rack transceivers. In several implementations, coaches can communicate via full-duplex, digital, and encrypted radio transmissions. This allows multiple coaches to transmit simultaneously on their respective team intercom systems. In several implementations, the headset microphones of the two head coaches' communication units are always live (i.e., always picking up audio) during the game. Each head coach's belt may include a mechanical platoon switch or button (e.g., a toggle switch) that the head coach controls to one of two positions: offense or defense. When the platoon switch is in the offense position, the microphone pickups from the head coach's headset are relayed to the offensive assistant coaches (including the offensive assistant coach who calls plays) for that team.Conversely, when the platoon change is in the defensive position, the microphone pickups from the head coach's headset are relayed to the defensive assistant coaches (including the defensive assistant coach who makes the plays) of that team. In several implementations, the microphones on the assistant coaches' headsets are not always on. Instead, the waist pack or headset of each assistant coach's communication unit may include a Talk button that the assistant coach presses to transmit to the other offensive or defensive assistant coaches (as applicable) and to that assistant coach's team's head coach. That is, for example, during a period of time when an offensive assistant coach on Team 1 presses the Talk button on that assistant coach's communication unit, the microphone on that assistant coach's headset will pick up that assistant coach's audible expressions, and the two-way radio transceiver in that assistant coach's communication unit waist pack sends a digitized and encrypted radio transmission of the captured audio from the assistant coach.Transceiver 12 on the sideline receives and decrypts the radio transmission in real time and forwards it, again digitized and decrypted, to the communication units of the other offensive assistant coaches and to the head coach of Team 1 in this example. The head coach of Team 1, however, will only hear the transmission if the platoon switch on the head coach's communication unit is in the attack position. If the platoon switch on the head coach's communication unit is in the defense position, the head coach's communication unit will not play the transmission from the offensive assistant coach of Team 1. The radio transmissions for the defensive coaches of Team 1 operate in an analogous manner, and the radio transmissions (offensive and defensive) for Team 2 operate in an analogous manner to Team 1. The offensive and defensive channels for Team 1 are different from the offensive and defensive channels for Team 2, so that there is no cross-talk or eavesdropping between the coaches of the teams. As mentioned earlier, when using full duplex two-way radio transmissions for the trainer communication units, multiple trainers on one channel can transmit simultaneously. In several implementations, an offensive assistant coach and a defensive assistant coach for each half have game-calling abilities, where the game calls from those designated assistant coaches are wirelessly transmitted to specific helmet receivers worn by the players on that team. For example: game calls from the offensive assistant coach of Team 1 are transmitted to the offensive players of Team 1 who have helmet receivers; game calls from the defensive assistant coach of Team 1 are transmitted to the defensive players of Team 1 who have helmet receivers; game calls from the offensive assistant coach of Team 2 are transmitted to the offensive players of Team 2 who have helmet receivers; and game calls from the defensive assistant coach of Team 2 are transmitted to the defensive players of Team 2 who have helmet receivers.To relay play calls, the communication units of the designated assistant game coaches for each team have a Play Call button (in addition to the previously mentioned Talk button). In operation, when an assistant game coach calls a play, the assistant game coach presses the Play Call button on their communication unit. This causes the microphone on their communication unit to pick up the audible pronunciation of the play call and triggers the unit to transmit a radio transmission of the play call to the 12-band rack transceiver. The play call is preferably on the same radio channel as the communications between the other offensive / defensive assistant coaches. This way, all offensive and defensive coaches (as applicable) and the head coach hear the play call on the offensive / defensive channel. As shown in Figures 1 and 2, the side-rack transceiver 12 is in communication with the Team 1 and Team 2 transmitter boxes 14A and 14B. The side-rack transceiver 12 is preferably connected to the transmitter boxes 14A and 14B using XLR-terminated audio cables. Also, as shown in Figures 1 and 2, there can be two links from the side-rack transceiver 12 to the respective Team 1 and Team 2 transmitter boxes 14A and 14B—one link for attack and one link for defense. Figure 3 is a block diagram of one of the transmitter cases, in this case, the Team 1 14A transmitter case. The Team 2 14B transmitter case can be identical to the Team 1 14A transmitter case, except that the Team 2 14B transmitter case is connected to and communicates with the Team 2 helmet receivers. As shown in Figure 3, each transmitter box can comprise two transmitters—one transmitter 20 for attack and one transmitter 22 for defense. Each transmitter box 14A, 14B can also comprise a power pack 24, a return-loop monitor 26 for attack, a return-loop monitor 28 for defense, an interface module 30 for attack with a mechanical toggle switch 32, and an interface module 34 for defense with a mechanical toggle switch 36. The offense and defense radio transmitters 20 and 22 are connected, preferably before the game, to the respective offense and defense helmet modules for their team, so that the helmet modules can decode the radio transmissions. In operation, when an assistant coach for the offense or defense of Team 1 transmits a game call to the sideline rack transceiver 12 on the offense or defense game call channel of Team 1, as the case may be, as described above, the sideline rack transceiver 12 forwards the transmission to the Team 1 transmitter bundle 14A via communication links 16A.The audio is forwarded to the offense or defense radio transmitters 20, 22, as the case may be (i.e., offense game calls on the offense game call channel for Team 1 are forwarded to offense radio transmitter 20 and defense game calls on the defense game call channel for Team 1 are forwarded to defense radio transmitter). 22). The offense or defense radio transmitters 20, 22, as the case may be, radio transmit the game call audio to the respective offense or defense players who have helmet receivers that are connected to the appropriate radio transmitter 20, 22. In several embodiments, the radio transmissions from the offense and defense radio transmitters 20, 22 are one-way radio transmissions; that is, the helmet receivers do not transmit radio signals back to the transmitter box 14A. The attack and defense monitoring loops 26 and 28 receive the respective attack and defense game call transmissions and provide an audio monitoring loop if desired. The game calls are forwarded to the attack and defense radio transmitters 20 and 22 via the respective attack and defense interface modules 30 and 34. In various implementations, the attack and defense radio transmitters 20 and 22 can be implemented using ProCom Technologies XI2 model backpack transmitters. These transmitters have multi-channel capability, allowing one channel to be used for offense and another for defense, with a button on the radio transmitter to switch or cycle through the channels.To avoid the need for a person(s) servicing transmitter packs 14A, 14B to switch transmitters 20, 22 from offense to defense for each team as the game progresses, each transmitter pack 14A, 14B may have two transmitters 20, 22, as shown in Figure 3 (one for offense and one for defense), and each transmitter 20, 22 has a corresponding interface module, e.g., the offense and defense interface modules 30, 34 shown in Figure 3. Each interface module 30, 34 may comprise a multi-position mechanical switch (e.g., on and off), such as the toggle switches 32, 36 shown in Figure 3. The attack and defense interface modules 30 and 34 are configured to always transmit the audio received from the assistant game coaches to their corresponding attack or defense radio transmitters 20 and 22 when their corresponding switches 32 and 36 are in the "on" position. Therefore, throughout the game, the attack radio transmitter 20 is configured for the attack channel (e.g., the channel that communicates with the attacking helmet receivers); similarly, the defense radio transmitter is configured for the defense channel (e.g., the channel that communicates with the defense helmet receivers); and switches 32 and 36 can be set to "on" throughout the game so that attack and defense play calls are transmitted to the helmet receivers of the attacking and defending players, respectively, by radio transmitters 20 and 22.In several embodiments, radio transmitters 20 and 22 can transmit at a frequency of approximately 900 MHz. After the game, switches 32 and 36 can be switched to the off position. In several embodiments, transmitters 22 and 23 can each contain rechargeable batteries. Power pack 24 can charge the rechargeable batteries in transmitters 22 and 23 using 120V AC mains power, for example. As shown in Figures 1 and 2, the cases for transmitters 14A and 14B can be in the form of portable cases, such as briefcases or similar, with a handle and lock. In several embodiments, each team has its own transmitter case that it carries to the game. A team representative can check, before the game, that transmitters 22 and 23 are communicating correctly with their team's headset receivers so that the players can effectively hear game calls through their headset receivers during the game. Returning to Figures 1 and 2, the transceiver on side-by-side line 12 may also be in communication with a rack in truck bay 40, which is, in turn, in communication with a broadcast truck 42. The communication links between the transceiver in side-by-side rack 12 and the rack in truck bay 40, and between the rack in truck bay 40 and the broadcast truck, may comprise fiber optic cables. Such communication links may carry, for example, six audio signals: the microphone of the head coach of team 1, the offensive play calls for team 1, the defensive play calls for team 1, the microphone of the head coach of team 2, the offensive play calls for team 2, and the defensive play calls for team 2.For example, the transceiver on band 12 receives radio transmissions from the always-on microphone in the headset of each team's head coach and sends that audio to TV truck 42, via the rack in truck bay 40, for inclusion in the television broadcast of the soccer game. Similarly, the transceiver on band 12 receives game calls from each team's assistant coaches on the game call channels and sends those transmissions to TV truck 42, via the rack in truck bay 40, for inclusion in the television broadcast of the soccer game. As the description above shows, the first-team coaches are not part of the second-team intercom system, and vice versa. Therefore, the first-team coaches cannot hear the second-team coaches' intercom communications during the match, and vice versa. Likewise, the first-team players and coaches cannot hear the second-team's game calls, and vice versa. In the description above, the players' helmet receivers did not include transmitters; they simply received play calls via radio transmission. In other embodiments, some of the players' helmet modules could include microphones and radio transmitters. In this way, the audio captured by the microphone in the players' helmet modules could be radio-transmitted to the respective team's transmitter package (14A, 14B) and forwarded to the sideline rack transceiver (12) for transmission to the TV truck (42) for inclusion in the game broadcast. In this embodiment, the respective team's transmitter package (14A, 14B) includes radio receivers to receive the audio transmitted via radio from the players' helmet modules. Additionally, in some implementations, some or all players may have helmets with a helmet receiver module. Furthermore, in several implementations, there may be more than two channels per team—that is, more than the offense and defense channels per team. For example, the offense might have multiple channels, such as separate channels for skill players (e.g., quarterback, wide receivers, running backs) and offensive linemen. Similarly, the defense might have multiple separate channels, such as channels for linemen, linebackers, and secondary players. Special teams players may also have helmet modules for a dedicated special teams transmitter. In implementations that utilize multiple different groups, the transmitter boxes might contain one transmitter for each group.Alternatively, each group could have its own assistant coach to call plays for that group, or one coach could call plays for multiple groups. In such a scenario, the assistant coach's communication headset could have one button to relay play calls to one group (e.g., the skill players on offense) and another button to relay play calls to another group (e.g., the offensive lineman). Also in such implementations, all the various play calls could be forwarded to the TV 42 broadcast truck for inclusion in the TV broadcast in a manner similar to that described above for the offensive and defensive play calls for each team. The examples presented herein are intended to illustrate potential and specific implementations of the present invention. It may be appreciated that the examples are primarily intended to illustrate the invention to those skilled in the art. No particular aspect or aspects of the examples are necessarily intended to limit the scope of the present invention. Furthermore, it should be understood that the figures and descriptions of the present invention have been simplified to illustrate the elements that are relevant to a clear understanding of the present invention, while other elements have been omitted for the sake of clarity. Although several embodiments have been described herein, it should be evident that persons skilled in the art may make various modifications, alterations, and adaptations of such embodiments in order to obtain at least some of the advantages.Therefore, the disclosed realizations are intended to include all such modifications, alterations and adaptations without departing from the scope of the realizations as set forth in this document.

Claims

1. A transmission system, comprising: a first communication unit including a microphone, a loudspeaker and a radio transceiver; a second communication unit including a microphone, a loudspeaker and a radio transceiver; a third communication unit including a microphone, a loudspeaker and a radio transceiver; a plurality of receiving units, each of which includes a loudspeaker; a central transceiver unit including at least one transceiver, the central transceiver unit being configured to receive communications from the first communication unit, the second communication unit and the third communication unit; and a central transmitting unit operatively coupled to the central transceiver unit, the central transmitting unit being configured to receive communications from the central transceiver unit and to transmit communications to the plurality of receiving units.

2. The transmission system of claim 1, wherein the first microphone of the communication unit is in an always-on configuration.

3. The broadcasting system of claim 1, wherein the plurality of receiving units are arranged within helmets.

4. The broadcasting system of claim 1, wherein the plurality of receiving units comprises a first subset of receiving units and a second subset of receiving units, the first subset of receiving units being keyed to receive communications from the first communication unit and the second communication unit, and the second subset of receiving units being keyed to receive communications from the first communication unit and the third communication unit.

5. The broadcasting system of claim 1, further comprising: a fourth communication unit including a microphone, a loudspeaker and a radio transceiver; a fifth communication unit including a microphone, a loudspeaker and a radio transceiver, wherein the second communication unit and the fourth communication unit communicate on a first channel, and wherein the third communication unit and the fifth communication unit communicate on a second channel.

6. The broadcasting system of claim 5, wherein the second communication unit and the third communication unit each include a selector for activating the microphone of the second communication unit and the microphone of the third communication unit, respectively, in order to communicate with the fourth communication unit and the fifth communication unit, respectively.

7. The broadcasting system of claim 6, wherein the plurality of receiving units comprises a first subset of receiving units and a second subset of receiving units, wherein the second communication unit includes a second selector for communicating simultaneously with the fourth communication unit and the first subset of receiving units, and wherein the third communication unit includes a third selector for communicating simultaneously with the fifth communication unit and the second subset of receiving units.

8. The broadcasting system of claim 5, wherein the first communication unit includes a switch for selectively communicating on the first channel or the second channel.

9. The broadcasting system of claim 1, wherein the central transceiver unit is arranged in a portable housing.

10. The broadcasting system of claim 1, wherein communications from the first communication unit pass through the central transceiver before being communicated to any of the second communication unit, the third communication unit, or the plurality of receiving units.

11. The broadcasting system of claim 10, wherein the first communication system communicates wirelessly with the central transceiver.

12. The broadcasting system of claim 10, wherein communications to and from the central transceiver are encoded.

13. The broadcasting system of claim 1, wherein the central transmitting unit is a portable housing comprising at least one monitor loop module, at least one interface module, at least one transmitter, and a power supply.

14. The broadcasting system of claim 13, wherein the plurality of receiving units comprises a first subset of receiving units and a second subset of receiving units, wherein the at least one transmitter comprises a first transmitter and a second transmitter, wherein the first transmitter is configured to communicate with the first subset of receiving units, and wherein the second transmitter is configured to communicate with the second subset of receiving units.

15. The broadcasting system of claim 13, wherein the at least one transmitter includes a battery, and wherein the battery is electrically coupled to the power supply.

16. The broadcasting system of claim 1, wherein the central transceiver unit is configured to communicate with a television broadcasting system.

17. The broadcasting system of claim 16, wherein communications from at least one of the first communication unit, the second communication unit, or the third communication unit are communicated to the television broadcasting system to be included as part of a television broadcast.

18. The transmission system of claim 1, wherein the plurality of receiving units includes a first subset of receiving units and a second subset of receiving units, and wherein the second communication unit includes a selector for selectively communicating with either the first subset or the second subset of receiving units.

19. The broadcasting system of claim 1, wherein communications to the transceiver unit and communications to the transmitting unit are coded.

20. A television transmission system for broadcasting a football game played at a venue between a first team and a second team, wherein each team comprises players and coaches, and the coaches of each team consist of a head coach and multiple assistant coaches, the television transmission system comprising: a first team intercom system through which the first team coaches communicate during the football game, wherein the first team intercom system comprises a plurality of first team coaches communication units, each of the first team coaches communication units comprising a loudspeaker, a microphone, and a radio transceiver;a second team intercom system through which the second team coaches communicate during the football match, wherein the second team intercom system comprises a plurality of second team coach communication units, wherein each of the second team coach communication units comprises a loudspeaker, a microphone, and a radio transceiver; a band rack transceiver comprising a first team transceiver for receiving the radio transmission from the first team coaches via the first team intercom system; and a second team transceiver for receiving the radio transmissions from the second team coaches via the second team intercom system;and a plurality of first-team helmet receivers that are placed on the helmets of the first-team players, wherein the plurality of first-team helmet receivers comprises a set of offensive helmet receivers for the first-team offensive players; and a set of defensive helmet receivers for the first-team defensive players; a plurality of second-team helmet receivers that are placed on the helmets of the second-team players, wherein the plurality of second-team helmet receivers comprises a set of offensive helmet receivers for the second-team offensive players; and a set of defensive helmet receivers for the second-team defensive players;a first team transmitter package having a communication link with the sideline rack transceiver, wherein the first team transmitter package comprises a first team offense radio interface module for receiving first team offense game calls, via the first team transceiver of the sideline rack transceiver, from a first team offense assistant coach, wherein the first team offense radio interface module comprises an on / off switch;a first-team offense radio transmitter connected to the first-team offense radio interface module to wirelessly transmit first-team offense game calls to the first-team offense players' helmet receiver assembly when the first-team offense radio interface module's on-off switch is in the on position; a first-team defense radio interface module to receive first-team defense game calls, via the first sideline rack transceiver, from a first-team defense assistant coach, wherein the first-team defense radio interface module comprises an on-off switch;a first team defense radio transmitter connected to the first team defense radio interface module to wirelessly transmit the first team defense game calls to the defense helmet receiver array for the first team offensive players when the first team defense radio interface module's power-off switch is in the on position;a second team transmitter package having a communication link with the sideline rack, wherein the second team transmitter package comprises a second team offense radio interface module for receiving first team offense game calls, via the second sideline rack transceiver, from a second team offense assistant game call coach, wherein the second team offense radio interface module comprises an on-off switch;a second team offensive radio transmitter connected to the second team offensive radio interface module to wirelessly transmit second team offensive game calls to the offensive helmet receiver set for second team offensive players when the second team offensive radio interface module's on / off switch is in the on position; a second team defense radio interface module to receive first team defense game calls, via the second sideline transceiver, from a second team defense assistant coach, wherein the second team defense radio interface module includes an on / off switch;a team's second defense radio transmitter connected to the team's second defense radio interface module to wirelessly transmit the team's second defense game calls to the defense helmet receiver set for the second team's offensive players when the team's second defense radio interface module power switch is in the on position; wherein the sideline rack transceiver is in communication with a television broadcast truck and the sideline rack transceiver is configured to transmit audio signals to the television broadcast truck during the football game, wherein the audio signals comprise a first audio transmission from the microphone of a first team head coach's communication unit;a second audio signal from the microphone of a second-team coach's communication unit; a third audio signal comprising the first team's offensive play calls; a fourth audio signal including the first team's defensive play calls; a fifth audio signal including the second team's offensive play calls; and a sixth audio signal including the second team's defensive play calls.

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